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  • 1.
    Abbasi, Alireza
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Lindqvist-Reis, Patric
    Eriksson, Lars
    Sandström, Dick
    Lidin, Sven
    Persson, Ingmar
    Sandström, Magnus
    Highly hydrated cations: Deficiency, mobility and coordination of water in crystalline nonahydrated scandium(III), yttrium(III) and lanthanoid(III) trifluoromethanesulfonate2005Inngår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 11, nr 14, 4065-4077 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Trivalent lanthanide-like metal ions coordinate nine water oxygen atoms, which form a tricapped trigonal prism in a large number of crystalline hydrates. Water deficiency, randomly distributed over the capping positions, was found for the smallest metal ions in the isomorphous nonahydrated trifluoromethanesulfonates, [M(H2O)(n)]CF3SO3)(3), in which M=Sc-III, Lu-III, Yb-III, Tm-III or Er-III. The hydration number n increases (n=8.0(1), 8.4(1), 8.7(1), 8.8(1) and 8.96(5), respectively) with increasing ionic size. Deuterium (H-2) solid-state NMR spectroscopy revealed fast positional exchange between the coordinated capping and prism water molecules; this exchange started at temperatures higher than about 280 K for lutetium(m) and below 268 K for scandium(m). Similar positional exchange for the fully nonahydrated yttrium(m) and lanthanum(m) compounds started at higher temperatures, over about 330 and 360 K, respectively. An exchange mechanism is proposed that can exchange equatorial and capping water molecules within the restrictions of the crystal lattice, even for fully hydrated lanthanoid(III) ions. Phase transitions occurred for all the water-deficient compounds at; 185 K. The hydrated scandium(III) trifluoromethanesulfonate transforms reversibly (Delta H degrees= -0.80(1) kJ mol(-1) on cooling) to a trigonal unit cell that is almost nine times larger, with the scandium ion surrounded by seven fully occupied and two partly occupied oxygen atom positions in a distorted capped trigonal prism. The hydrogen bonding to the trifluoromethanesulfonate anions stabilises the trigonal prism of water ligands, even for the crowded hydration sphere of the smallest metal ions in the series. Implications for the Lewis acid catalytic activity of the hydrated scandium(III) and lanthanoid(III) trifluoromethanesulfonates for organic syntheses performed in aqueous media are discussed.

  • 2.
    Abrahamsson, Thomas
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för kliniska vetenskaper. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Barn- och kvinnocentrum, Barn- och ungdomskliniken i Linköping.
    Sherman, Philip M.
    University of Toronto, Canada .
    Editorial Material: Multifaceted Effects of Human Milk Oligosaccharides2014Inngår i: Journal of Infectious Diseases, ISSN 0022-1899, Vol. 209, nr 3, 323-324 s.Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    n/a

  • 3.
    Agmo Hernández, Víctor
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Fysikalisk kemi.
    Karlsson, Göran
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Fysikalisk kemi.
    Edwards, Katarina
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Fysikalisk kemi.
    Intrinsic Heterogeneity in Liposome Suspensions Caused by the Dynamic Spontaneous Formation of Hydrophobic Active Sites in Lipid Membranes2011Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, nr 8, 4873-4883 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The spontaneous, dynamic formation of hydrophobic active sites in lipid bilayer membranes is studied and characterized. It is shown that the rates of formation and consumption of these active sites control at least two important properties of liposomes: their affinity for hydrophobic surfaces and the rate by which they spontaneously release encapsulated molecules. The adhesion and spreading of liposomes onto hydrophobic polystyrene nanoparticles and the spontaneous leakage of an encapsulated fluorescent dye were monitored for different liposome compositions employing Cryo-TEM, DLS, and fluorescence measurements. It was observed that an apparently homogeneous, monodisperse liposome suspension behaves as if composed by two different populations: a fast leaking population that presents affinity for the hydrophobic substrate employed, and a slow leaking population that does not attach immediately to it. The results reported here suggest that the proportion of liposomes in each population changes over time until a dynamic equilibrium is reached. It is shown that this phenomenom can lead to irreproducibility in, for example, spontaneous leakage experiments, as extruded liposomes leak much faster just after preparation than 24 h afterward. Our findings account for discrepancies in several experimental results reported in the literature. To our knowledge, this is the first systematic study addressing the issue of an existing intrinsic heterogeneity of liposome suspensions.

  • 4.
    Aili, Daniel
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Polypeptide-Based Nanoscale Materials2008Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Self-assembly has emerged as a promising technique for fabrication of novel hybrid materials and nanostructures. The work presented in this thesis has been focused on developing nanoscale materials based on synthetic de novo designed polypeptides. The polypeptides have been utilized for the assembly of gold nanoparticles, fibrous nanostructures, and for sensing applications.

    The 42-residue polypeptides are designed to fold into helix-loop-helix motifs and dimerize to form four-helix bundles. Folding is primarily driven by the formation of a hydrophobic core made up by the hydrophobic faces of the amphiphilic helices. The peptides have either a negative or positive net charge at neutral pH, depending on the relative abundance of Glu and Lys. Charge repulsion thus prevents homodimerization at pH 7 while promoting hetero-dimerization through the formation of stabilising salt bridges. A Cys incorporated in position 22, located in the loop region, allowed for directed, thiol-dependent, immobilization on planar gold surfaces and gold nanoparticles. The negatively charged (Glu-rich) peptide formed homodimers and folded in solution at pH < 6 or in the presence of certain metal ions, such as Zn2+. The folding properties of this peptide were retained when immobilized directly on gold, which enabled reversible assembly of gold nanoparticles resulting in aggregates with well-defined interparticle separations. Particle aggregation was found to induce folding of the immobilized peptides but folding could also be utilized to induce aggregation of the particles by exploiting the highly specific interactions involved in both homodimerization and hetero-association. The possibility to control the assembly of polypeptide-functionalized gold nanoparticles was utilized in a colorimetric protein assay. Analyte binding to immobilized ligands prevented the formation of dense particle aggregates when subjecting the particles to conditions normally causing extensive aggregation. Analyte binding could hence easily be distinguished by the naked eye. Moreover, the peptides were utilized to assemble gold nanoparticles on planar gold and silica substrates.

    Fibrous nanostructures were realized by linking monomers through a disulphide-bridge. The disulphide-linked peptides were found to spontaneously assemble into long and extremely thin peptide fibres as a result of a propagating association mediated by folding into four-helix bundles.

  • 5.
    Aili, Daniel
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Enander, Karin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Rydberg, Johan
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Nesterenko, Irina
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Björefors, Fredrik
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Baltzer, Lars
    Division of Organic Chemistry, Department of Biochemistry and Organic Chemistry, BMC, Box 599, Uppsala University, SE-751 24 Uppsala, Sweden..
    Liedberg, Bo
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Controlled Assembly of Gold Nanoparticles using De Novo Designed Polypeptide Scaffolds2008Inngår i: Proceedings SPIE, Vol. 6885, Photonic Biosensing and Microoptics, 2008, 688506-1-688506-8 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heterodimerization between designed helix-loop-helix polypeptides was utilized in order to assemble gold nanoparticles on planar substrates. The peptides were designed to fold into four-helix bundles upon dimerization. A Cys-residue in the loop region was used to immobilize one of the complementary peptides on a maleimide containing SAM on planar gold substrates whereas the second peptide was immobilized directly on gold nanoparticles. Introducing the peptide decorated particles over a peptide functionalized surface resulted in particle assembly. Further, citrate stabilized particles were assembled on amino-silane modified glass and silicon substrates. By subsequently introducing peptides and gold nanoparticles, particle-peptide hybrid multi layers could be formed.

  • 6.
    Aili, Daniel
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Enander, Karin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Rydberg, Johan
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Nesterenko, Irina
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Björefors, Fredrik
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Baltzer, Lars
    Department of Biochemistry and Organic Chemistry, BMC, Box 599, Uppsala UniVersity, SE-751 24 Uppsala, Sweden.
    Liedberg, Bo
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Folding Induced Assembly of Polypeptide Decorated Gold Nanoparticles2008Inngår i: Journal of the American Chemical Society, ISSN 0002-7863, Vol. 130, nr 17, 5780-5788 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Reversible assembly of gold nanoparticles controlled by the homodimerization and folding of an immobilized de novo designed synthetic polypeptide is described. In solution at neutral pH, the polypeptide folds into a helix–loop–helix four-helix bundle in the presence of zinc ions. When immobilized on gold nanoparticles, the addition of zinc ions induces dimerization and folding between peptide monomers located on separate particles, resulting in rapid particle aggregation. The particles can be completely redispersed by removal of the zinc ions from the peptide upon addition of EDTA. Calcium ions, which do not induce folding in solution, have no effect on the stability of the peptide decorated particles. The contribution from folding on particle assembly was further determined utilizing a reference peptide with the same primary sequence but containing both D and L amino acids. Particles functionalized with the reference peptide do not aggregate, as the peptides are unable to fold. The two peptides, linked to the nanoparticle surface via a cysteine residue located in the loop region, form submonolayers on planar gold with comparable properties regarding surface density, orientation, and ability to interact with zinc ions. These results demonstrate that nanoparticle assembly can be induced, controlled, and to some extent tuned, by exploiting specific molecular interactions involved in polypeptide folding.

  • 7.
    Aili, Daniel
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Tai, Feng-I
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Enander, Karin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Baltzer, Lars
    Department of Biochemistry andOrganic Chemistry Uppsala University, BMC, Box 576, 75123 Uppsala, Sweden.
    Liedberg, Bo
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Self-Assembly of Fibers and Nanorings from Disulfide-Linked Helix–Loop–Helix Polypeptides2008Inngår i: Angewandte Chemie International Edition, ISSN 1433-7851, Vol. 47, nr 30, 5554-5556 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 8.
    Aili, Daniel
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Enander, Karin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Rydberg, Johan
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Lundström, Ingemar
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad Fysik. Linköpings universitet, Tekniska högskolan.
    Baltzer, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Liedberg, Bo
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensorvetenskap och Molekylfysik. Linköpings universitet, Tekniska högskolan.
    Aggregation-Induced Folding of a de novo Designed Polypeptide Immobilized on Gold Nanoparticles2006Inngår i: Journal of the American Chemical Society, ISSN 0002-7863, Vol. 128, nr 7, 2194 -2195 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This communication reports the first steps in the construction of a novel, nanoparticle-based hybrid material for biomimetic and biosensor applications. Gold nanoparticles were modified with synthetic polypeptides to enable control of the particle aggregation state in a switchable manner, and particle aggregation was, in turn, found to induce folding of the immobilized peptides.

  • 9.
    Alexander, Michelle
    et al.
    Univ York, York YO10 5DD, N Yorkshire, England.;Univ Aberdeen, Sch Geosci, Dept Archaeol, Aberdeen AB24 3UF, Scotland..
    Ho, Simon Y. W.
    Univ Sydney, Sch Biol Sci, Sydney, NSW 2006, Australia..
    Molak, Martyna
    Polish Acad Sci, Museum & Inst Zool, PL-00679 Warsaw, Poland..
    Barnett, Ross
    Palaeogen & Bioarchaeol Res Network, Res Lab Archaeol, Oxford OX1 3QY, England..
    Carlborg, Örjan
    Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Dorshorst, Ben
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi. Virginia Tech, Dept Anim & Poultry Sci, Blacksburg, VA 24061 USA..
    Honaker, Christa
    Virginia Tech, Dept Anim & Poultry Sci, Blacksburg, VA 24061 USA..
    Besnier, Francois
    Inst Marine Res, Sect Populat Genet, N-5024 Bergen, Norway..
    Wahlberg, Per
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi. Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinska vetenskaper, Molekylär medicin.
    Dobney, Keith
    Univ Aberdeen, Sch Geosci, Dept Archaeol, Aberdeen AB24 3UF, Scotland..
    Siegel, Paul
    Virginia Tech, Dept Anim & Poultry Sci, Blacksburg, VA 24061 USA..
    Andersson, Leif
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi. Swedish Univ Agr Sci, Dept Anim Breeding & Genet, S-75007 Uppsala, Sweden..
    Larson, Greger
    Palaeogen & Bioarchaeol Res Network, Res Lab Archaeol, Oxford OX1 3QY, England..
    Mitogenomic analysis of a 50-generation chicken pedigree reveals a rapid rate of mitochondrial evolution and evidence for paternal mtDNA inheritance2015Inngår i: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 11, nr 10, 20150561Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mitochondrial genomes represent a valuable source of data for evolutionary research, but studies of their short-term evolution have typically been limited to invertebrates, humans and laboratory organisms. Here we present a detailed study of 12 mitochondrial genomes that span a total of 385 transmissions in a well-documented 50-generation pedigree in which two lineages of chickens were selected for low and high juvenile body weight. These data allowed us to test the hypothesis of time-dependent evolutionary rates and the assumption of strict maternal mitochondrial transmission, and to investigate the role of mitochondrial mutations in determining phenotype. The identification of a non-synonymous mutation in ND4L and a synonymous mutation in CYTB, both novel mutations in Gallus, allowed us to estimate a molecular rate of 3.13 x 10(-7) mutations/site/year (95% confidence interval 3.75 x 10(-8)-1.12 x 10(-6)). This is substantially higher than avian rate estimates based upon fossil calibrations. Ascertaining which of the two novel mutations was present in an additional 49 individuals also revealed an instance of paternal inheritance of mtDNA. Lastly, an association analysis demonstrated that neither of the point mutations was strongly associated with the phenotypic differences between the two selection lines. Together, these observations reveal the highly dynamic nature of mitochondrial evolution over short time periods.

  • 10.
    Alfredsson, Emma
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    The Manufacture of a Vegetarian Smoothie2010Independent thesis Advanced level (degree of Master (One Year)), 30 poäng / 45 hpOppgave
  • 11.
    Almgren, Mats
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi.
    Garamus, Vasil M
    Nordstierna, Lars
    Luc-Blin, Jean
    Stébé, Marie-José
    Nonideal mixed micelles of fluorinated and hydrogenous surfactants in aqueous solution: NMR and SANS studies of anionic and nonionic systems.2010Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, nr 8, 5355-5363 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Contrast variation SANS and (19)F chemical shifts were measured for three mixed equimolar micelle systems: sodium perfluorooctanoate (SPFO) and sodiumdecylsulfate (SDeS) in 200 mM NaCl, lithium perfluorononanate (LiPFN) and lithium dodecylsulfate (LiDS) in 200 mM LiCl, and a nonionic system C(8)F(17)C(2)H(4)(OC(2)H(4))(9) and C(12)H(25)(OC(2)H(4))(8) in water, all at 25 degrees C. The chemical shift measurements allow the calculation of the average fraction of nearest neighbors of each kind around the reporter group (the trifluoromethyl group). A preference for like neighbors were found in all systems, smallest in the SDeS/SPFO system and largest in the nonionic system, but in all cases substantially smaller than expected at critical conditions. From the SANS measurements the width of the micelle composition distribution was obtained. For the ionic systems similar values were obtained, showing a broadening compared to ideal mixtures, but not broad enough for demixing or clearly bimodal distributions. In the nonionic system the width was estimated as sigma = 0.18 and 0.22 using two different evaluation methods. These values suggest that the system is close to critical conditions. The lower value refers to a direct modeling of the system, assuming an ellipsoidal shape and a Gaussian composition distribution. The modeling showed the nonionic mixed micelles to be prolate ellipsoids with axial ratio 2.2 and an aggregation number larger than 100, whereas the two ionic systems fitted best to oblate shapes (axial ratios 0.8 and 0.65 for SDeS/SPFO and LiDS/LiPFN, respectively) and aggregation numbers of 60 for both.

  • 12.
    Ammar, Maria
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi.
    Immunohistochemical studies on small arteries from women with polycystic ovary syndrome: Focus on makers for endothelial dysfunction2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Women with polycystic ovary syndrome (PCOS) have an increased risk of developing cardiovascular disease (CVD). Metabolic syndrome predominate which may lead to impaired insulin sensitivity and development of type II diabetes and hypertension. Endothelial dysfunction together with pro-inflammatory, pro-thrombotic and pro-oxidant environment serves as initial phase for CVD complications. The research group performs functional studies on isolated arteries with focus on endothelium dependent relaxation from PCOS women and age matched controls and the aim of the presented project was to compare markers for endothelial dysfunction using immunohistochemistry (IHC). Small arteries were isolated from subcutaneous fat biopsies from patients and controls and fixed in O.C.T. compound (-70C dry ice). The biopsies were sectioned in 8µm thin slices for further staining with primary antibodies, DAB as a chromogen and Mayer´s Hematoxylin. The primary antibody was selected for endothelial cell adhesion molecules PECAM-1, P-selectin, vWF and VCAM-1.    There was a tendency for stronger expression of P-selectin in arteries from PCOS women compared with controls, while in the controls a tendency was seen towards stronger expression of VCAM-1 and a weaker staining for vWF if compared with PCOS. There was no obvious difference for other stained markers between the groups. There were differences between tested markers in control groups and the PCOS women whit IHC staining as well as earlier functional tests. Tested markers reflected that endothelial dysfunction were expressed in the endothelium of isolated arteries from PCOS and control women, however further functional studies and IHC studies were warranted to quantify their contribution.

  • 13. Amundsen, Brage Høyem
    et al.
    Ericsson, Madelene
    Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
    Seland, John Georg
    Pavlin, Tina
    Ellingsen, Øyvind
    Brekken, Christian
    A comparison of retrospectively self-gated magnetic resonance imaging and high-frequency echocardiography for characterization of left ventricular function in mice.2011Inngår i: Laboratory animals, ISSN 1758-1117, Vol. 45, nr 1, 31-37 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Non-invasive imaging methods like echocardiography and magnetic resonance imaging (MRI) are very valuable in longitudinal follow-up studies of cardiac function in small animals. To be able to compare results from studies using different methods, and explain possible differences, it is important to know the agreement between these methods. As both self-gated high-field MRI and high-frequency echocardiography (hf-echo) M-mode are potential methods for evaluation of left ventricular (LV) function in healthy mice, our aim was to assess the agreement between these two methods. Fifteen healthy female C57BL/6J mice underwent both self-gated MRI and hf-echo during the same session of light isoflurane anaesthesia. LV dimensions were estimated offline, and agreement between the methods and reproducibility for the two methods assessed using Bland-Altman methods. In summary, hf-echo M-mode had better inter-observer repeatability than self-gated MRI for all measured parameters. Compared with hf-echo, systolic posterior wall thicknesses were significantly higher when measured by MRI, while diastolic anterior wall thicknesses were found to be significantly smaller. MRI measurements of diastolic LV diameter were also higher using MRI, resulting in larger fractional shortening values compared with the values obtained by hf-echo. In conclusion, hf-echo M-mode is easy to apply, has high temporal and spatial resolution, and good reproducibility. Self-gated MRI might be advantageous in cases of abnormal LV geometry and heterogeneous regional myocardial function, especially with improvements in spatial resolution. The moderate agreement between the methods must be taken into account when comparing studies using the two modalities.

  • 14.
    Andaloussi, Mounir
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Henriksson, Lena M.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Wieckowska, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Lindh, Martin
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Björkelid, Christofer
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Larsson, Anna M.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Suresh, Surisetti
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Iyer, Harini
    Srinivasa, Bachally R.
    Bergfors, Terese
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Unge, Torsten
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Mowbray, Sherry L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Larhed, Mats
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Jones, T. Alwyn
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Struktur- och molekylärbiologi.
    Karlén, Anders
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
    Design, Synthesis, and X-ray Crystallographic Studies of alpha-Aryl Substituted Fosmidomycin Analogues as Inhibitors of Mycobacterium tuberculosis 1-Deoxy-D-xylulose 5-Phosphate Reductoisomerase2011Inngår i: Journal of Medicinal Chemistry, ISSN 0022-2623, E-ISSN 1520-4804, Vol. 54, nr 14, 4964-4976 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The natural antibiotic fosmidomycin acts via inhibition of 1-deoxy-D-xylulose 5-phosphate reductoisomerase (DXR), an essential enzyme in the non-mevalonate pathway of isoprenoid biosynthesis. Fosmidomycin is active on Mycobacterium tuberculosis DXR (MtDXR), but it lacks antibacterial activity probably because of poor uptake. alpha-Aryl substituted fosmidomycin analogues have more favorable physicochemical properties and are also more active in inhibiting malaria parasite growth. We have solved crystal structures of MtDXR in complex with 3,4-dichlorophenyl substituted fosmidomycin analogues; these show important differences compared to our previously described forsmidomycin-DXR complex. Our best inhibitor has an IC(50) = 0.15 mu M on MtDXR but still lacked activity in a mycobacterial growth assay (MIC > 32 mu g/mL). The combined results, however, provide insights into how DXR accommodates the new inhibitors and serve as an excellent starting point for the design of other novel and more potent inhibitors, particularly against pathogens where uptake is less of a problem, such as the malaria parasite.

  • 15. Andersen, Sonja
    et al.
    Ericsson, Madelene
    Department of Cancer Research and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim.
    Dai, Hong Yan
    Peña-Diaz, Javier
    Slupphaug, Geir
    Nilsen, Hilde
    Aarset, Harald
    Krokan, Hans E
    Monoclonal B-cell hyperplasia and leukocyte imbalance precede development of B-cell malignancies in uracil-DNA glycosylase deficient mice2005Inngår i: DNA Repair, ISSN 1568-7864, E-ISSN 1568-7856, Vol. 4, nr 12, 1432-1441 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ung-deficient mice have reduced class switch recombination, skewed somatic hypermutation, lymphatic hyperplasia and a 22-fold increased risk of developing B-cell lymphomas. We find that lymphomas are of follicular (FL) and diffuse large B-cell type (DLBCL). All FLs and 75% of the DLBCLs were monoclonal while 25% were biclonal. Monoclonality was also observed in hyperplasia, and could represent an early stage of lymphoma development. Lymphoid hyperplasia occurs very early in otherwise healthy Ung-deficient mice, observed as a significant increase of splenic B-cells. Furthermore, loss of Ung also causes a significant reduction of T-helper cells, and 50% of the young Ung(-/-) mice investigated have no detectable NK/NKT-cell population in their spleen. The immunological imbalance is confirmed in experiments with spleen cells where the production of the cytokines interferon gamma, interleukin 6 and interleukin 2 is clearly different in wild type and in Ung-deficient mice. This suggests that Ung-proteins, directly or indirectly, have important functions in the immune system, not only in the process of antibody maturation, but also for production and functions of immunologically important cell types. The immunological imbalances shown here in the Ung-deficient mice may be central in the development of lymphomas in a background of generalised lymphoid hyperplasia.

  • 16.
    Andersson, Ken G.
    et al.
    KTH Royal Inst Technol, Div Prot Technol, SE-10691 Stockholm, Sweden.
    Oroujeni, Maryam
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Garousi, Javad
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Mitran, Bogdan
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för Molekylär Avbildning.
    Ståhl, Stefan
    KTH Royal Inst Technol, Div Prot Technol, SE-10691 Stockholm, Sweden.
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för Molekylär Avbildning.
    Löfblom, John
    KTH Royal Inst Technol, Div Prot Technol, SE-10691 Stockholm, Sweden.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Feasibility of imaging of epidermal growth factor receptor expression with ZEGFR: 2377 affibody molecule labeled with 99mTc using a peptide-based cysteine-containing chelator2016Inngår i: International journal of oncology, ISSN 1791-2423, Vol. 49, nr 6, 2285-2293 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The epidermal growth factor receptor (EGFR) is overexpressed in a number of malignant tumors and is a molecular target for several specific anticancer antibodies and tyrosine kinase inhibitors. The overexpression of EGFR is a predictive biomarker for response to several therapy regimens. Radionuclide molecular imaging might enable detection of EGFR overexpression by a non-invasive procedure and could be used repeatedly. Affibody molecules are engineered scaffold proteins, which could be selected to have a high affinity and selectivity to predetermined targets. The anti-EGFR ZEGFR:2377 affibody molecule is a potential imaging probe for EGFR detection. The use of the generator-produced radionuclide 99mTc should facilitate clinical translation of an imaging probe due to its low price, availability and favorable dosimetry of the radionuclide. In the present study, we evaluated feasibility of ZEGFR:2377 labeling with 99mTc using a peptide-based cysteine-containing chelator expressed at the C-terminus of ZEGFR:2377. The label was stable in vitro under cysteine challenge. In addition, 99mTc-ZEGFR:2377 was capable of specific binding to EGFR-expressing cells with high affinity (274 pM). Studies in BALB/C nu/nu mice bearing A431 xenografts demonstrated that 99mTc-ZEGFR:2377 accumulates in tumors in an EGFR-specific manner. The tumor uptake values were 3.6±1 and 2.5±0.4% ID/g at 3 and 24 h after injection, respectively. The corresponding tumor-to-blood ratios were 1.8±0.4 and 8±3. The xenografts were clearly visualized at both time-points. This study demonstrated the potential of 99mTc-labeled ZEGFR:2377 for imaging of EGFR in vivo.

  • 17. Aquilante, Francesco
    et al.
    Barone, V
    Roos, B O
    A theoretical investigation of valence and Rydberg electronic states of acrolein.2003Inngår i: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 119, nr 23, 12323-12334 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The main features of the ultraviolet spectrum of acrolein have been studied by a multireference perturbative treatment and by a time dependent density functional approach. The valence and Rydberg transition energies have been calculated and the assignment of the experimental bands has been clarified. The different relaxation trends of the three lowest singlet and triplet excited states have been analyzed by unconstrained geometry optimizations. This has allowed, in particular, the characterization of a twisted (3)(pipi*) state, which is crucial for the interesting photophysics and photochemistry of the acrolein molecule and, more generally, of the alpha,beta-enones. Solvatochromic shifts in aqueous solution have been investigated using a combined discrete/continuum approach based on the so called polarizable continuum model. The experimental trends are well reproduced by this approach and a closer degeneracy in the triplet manifold has been detected in solution with respect to gas phase.

  • 18. Aquilante, Francesco
    et al.
    Cossi, M
    Crescenzi, O
    Scalmani, G
    Barone, V
    Computation of the acetone ultraviolet spectrum in gas phase and in aqueous solution by a mixed discrete/continuum model.2003Inngår i: Molecular Physics, ISSN 0026-8976, E-ISSN 1362-3028, Vol. 101, nr 13, 1945-1953 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ultraviolet spectrum of acetone in vacuum and in aqueous solution has been computed by different quantum mechanical methods coupled to the polarizable continuum model (PCM) for describing bulk solvent effects. The results in vacuo show that the time-dependent density functional theory (TDDFT) approach using the PBE0 functional reproduces quite well the result obtained at the CASPT2 level. Supermolecule computations confirm that water molecules belonging to the first shell of polar groups ( here the carbonyl oxygen) must be explicitly included in the quantum mechanical treatment, whereas the effect of other solvent molecules ( which is far from being negligible) can be reliably described by the PCM. Moreover, statistical averaging effects have been taken into account by performing canonical molecular dynamics (MD) simulations followed by TDDFT quantum mechanical computations on representative clusters of increasing dimensions immersed in a polarizable continuum. The results show that the combined MD/DFT/PCM approach is reliable and effective, although the performances of the force field used in the MD simulations must be further investigated.

  • 19. Aquilante, Francesco
    et al.
    De Vito, Luca
    Ferré, Nicolas
    Chigo, Giovanni
    Malmqvist, Per-Åke
    Neogrády, Pavel
    Pedersen, Tjomas Bono
    Pitoňák, Michak
    Reiher, Markus
    Roos, Björn O
    Serrano-Andrés, Luis
    Miroslav, Urban
    Veryazov, Valera
    Lindh, Roland
    Department of Theoretical Chemistry, Lund University.
    Software news and update MOLCAS 7: The Next Generation2010Inngår i: Journal of Computational Chemistry, ISSN 0192-8651, E-ISSN 1096-987X, Vol. 31, nr 1, 224-247 s.Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Some of the new unique features of the MOLCAS quantum chemistry package version 7 are presented in this report. In particular, the Cholesky decomposition method applied to some quantum chemical methods is described. This approach is used both in the context of a straight forward approximation of the two-electron integrals and in the generation of so-called auxiliary basis sets. The article describes how the method is implemented for most known wave functions models: self-consistent field, density functional theory, 2nd order perturbation theory, complete-active space self-consistent field multiconfigurational reference 2nd order perturbation theory, and coupled-cluster methods. The report further elaborates on the implementation of a restricted-active space self-consistent field reference function in conjunction with 2nd order perturbation theory. The average atomic natural orbital basis for relativistic calculations, covering the whole periodic table, are described and associated unique properties are demonstrated. Furthermore, the use of the arbitrary order Douglas-Kroll-Hess transformation for one-component relativistic calculations and its implementation are discussed. This section especially focuses on the implementation of the so-called picture-change-free atomic orbital property integrals. Moreover, the ElectroStatic Potential Fitted scheme, a version of a quantum mechanics/molecular mechanics hybrid method implemented in MOLCAS, is described and discussed. Finally, the report discusses the use of the MOLCAS package for advanced studies of photo chemical phenomena and the usefulness of the algorithms for constrained geometry optimization in MOLCAS in association with such studies.

  • 20. Aquilante, Francesco
    et al.
    Jensen, K. P.
    Roos, Björn O.
    The allyl radical revisited: a theoretical study of the electronic spectrum.2003Inngår i: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 380, nr 5-6, 689-698 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this Letter, we report the electronic spectrum of the allyl radical, obtained with multiconfigurational perturbation theory (MS-CASPT2). The assignment of the spectrum is in accordance with experiment to within 0.2 eV. We have computed the complete first Rydberg series and the beginning of the second Rydberg series. A new valence-excited B-2(1) state has been found which has hitherto been hidden by Rydberg transitions. A rationalisation of the electronic spectrum is provided in terms of resonance forms in ground and excited states. This model shows that while a multiconfigurational wavefunction is necessary to qualitatively model the system, the large ionic character of the valence electronic states makes an accurate treatment of the dynamical correlation necessary for a quantitative description of the spectrum.

  • 21. Aquilante, Francesco
    et al.
    Malmqvist, Per-Åke
    Pedersen, Thomas Bondo
    Ghosh, Abhik
    Roos, Björn Olof
    Cholesky decomposition-based multiconfiguration second-order perturbation theory (CD-CASPT2): application to the spin-state energetics of Co-III(diiminato)(NPh).2008Inngår i: Journal of Chemical Theory and Computation, ISSN 1549-9618, E-ISSN 1549-9626, Vol. 4, nr 5, 694-702 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The electronic structure and low-lying electronic states of a Co-III(diiminato)(NPh) complex have been studied using mulficonfigurational wave function theory (CASSCF/CASPT2) The results have been compared to those obtained with density functional theory. The best agreement with ab initio results is obtained with a modified B3LYP functional containing a reduced amount (15%) of Hartree-Fock exchange. A relativistic basis set with 869 functions has been employed in the most extensive ab initio calculations, where a Cholesky decomposition technique was used to overcome problems arising from the large size of the two-electron integral matrix. It is shown that this approximation reproduces results obtained with the full integral set to a high accuracy, thus opening the possibility to use this approach to perform multiconfigurational wave-function-based quantum chemistry on much larger systems relative to what has been possible until now.

  • 22. Aquilante, Francesco
    et al.
    Pedersen, Thomas Bondo
    Quartic scaling evaluation of canonical scaled opposite spin second-order Moller-Plesset correlation energy using Cholesky decompositions.2007Inngår i: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 449, nr 4-6, 354-357 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The scaled opposite spin second-order Moller-Plesset (SOS-MP2) energy expression is reformulated using Cholesky decomposition of the amplitude matrix. The resulting algorithm requires an auxiliary basis or Cholesky representation of the two-electron integrals and shows fourth-order scaling with system size. Based on an analysis of operation counts, we estimate that the present approach is computationally advantageous compared to the analogous fourth-order algorithms that employ Laplace transforms.

  • 23. Aquilante, Francesco
    et al.
    Pedersen, Thomas Bondo
    Sanchez de Meras, Alfredo
    Koch, Henrik
    Fast noniterative orbital localization for large molecules.2006Inngår i: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 125, nr 17Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We use Cholesky decomposition of the density matrix in atomic orbital basis to define a new set of occupied molecular orbital coefficients. Analysis of the resulting orbitals (”Cholesky molecular orbitals”) demonstrates their localized character inherited from the sparsity of the density matrix. Comparison with the results of traditional iterative localization schemes shows minor differences with respect to a number of suitable measures of locality, particularly the scaling with system size of orbital pair domains used in local correlation methods. The Cholesky procedure for generating orthonormal localized orbitals is noniterative and may be made linear scaling. Although our present implementation scales cubically, the algorithm is significantly faster than any of the conventional localization schemes. In addition, since this approach does not require starting orbitals, it will be useful in local correlation treatments on top of diagonalization-free Hartree-Fock optimization algorithms.

  • 24.
    Ardiles-Villegas, Karen
    et al.
    Universidad de Concepción, Chile.
    González-Acuña, Daniel
    Universidad de Concepción, Chile.
    Waldenström, Jonas
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Olsen, Björn
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV. Uppsala University.
    Hernandez, Jorge
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV. Uppsala University.
    Antibiotic resistance patterns in fecal bacteria isolated from Christmas shearwater (Puffinus nativitatis) and masked booby (Sula dactylatra) at remote Easter Island2011Inngår i: Avian diseases, ISSN 0005-2086, E-ISSN 1938-4351, Vol. 55, nr 3, 486-489 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Antibiotic use and its implications have been discussed extensively in the past decades. This situation has global consequences when antibiotic resistance becomes widespread in the intestinal bacterial flora of stationary and migratory birds. This study investigated the incidence of fecal bacteria and general antibiotic resistance, with special focus on extended spectrum beta-lactamase (ESBL) isolates, in two species of seabirds at remote Easter Island. We identified 11 species of bacteria from masked booby (Sula dactylatra) and Christmas shearwater (Puffinus nativitatis); five species of gram-negative bacilli, four species of Streptococcus (Enterococcus), and 2 species of Staphylococcus. In addition, 6 types of bacteria were determined barely to the genus level. General antibiotic susceptibility was measured in the 30 isolated Enterobacteriaceae to 11 antibiotics used in human and veterinary medicine. The 10 isolates that showed a phenotypic ESBL profile were verified by clavulanic acid inhibition in double mixture discs with cefpodoxime, and two ESBL strains were found, one strain in masked booby and one strain in Christmas shearwater. The two bacteria harboring the ESBL type were identified as Serratia odorifera biotype 1, which has zoonotic importance. Despite minimal human presence in the masked booby and Christmas shearwater habitats, and the extreme geographic isolation of Easter Island, we found several multiresistant bacteria and even two isolates with ESBL phenotypes. The finding of ESBLs has animal and public health significance and is of potential concern, especially because the investigation was limited in size and indicated that antibiotic-resistant bacteria now are distributed globally.

  • 25. Arend, A
    et al.
    Aunapuu, M
    Masso, R
    Selstam, Gunnar
    Umeå universitet, Medicinska fakulteten, Institutionen för molekylärbiologi (Medicinska fakulteten).
    Prostaglandins of the E-series inhibit connective tissue proliferation in the liver wound of the rat2005Inngår i: Annals of Anatomy, ISSN 0940-9602, E-ISSN 1618-0402, Vol. 187, nr 1, 57-62 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present study was undertaken to relate wound heating of an internal organ to prostaglandins of the E and F series. A small liver wound was induced by a galvanic cauter via the abdominal route under general anesthesia and prostaglandin E-1, E-2 and F-2 alpha were injected twice daily at a dose of 250 mu g/kg. Proliferation of the connective tissue in the liver wound was estimated morphometrically 6 days after liver wound infliction. Levels of prostaglandins E-2 and F-2 alpha were measured in the liver wound as well as in normal liver tissue from adjacent lobes using radioimmunoassay. The results show that exogenous prostaglandins of the E-series suppress connective tissue proliferation. Three minutes after the last prostaglandin E-2 injection, high prostaglandin concentrations were measured both in the tiver wound and in the liver tissue of the adjacent lobe. Prostaglandin F-2 alpha injections had no effect on wound heating. We believe that the rat thermic liver wound model can be used for different studies on wound heating mechanisms and that prostaglandins of the E-series are involved in wound heating in the specific time period studied.

  • 26.
    Arndt, Anton
    Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Laboratoriet för biomekanik och motorisk kontroll (BMC).
    Biomechanical concepts of Achilles Tendon pathogenesis2012Konferansepaper (Annet vitenskapelig)
  • 27.
    Arvidsson, Martin
    et al.
    Department of Psychology, Stockholm University, Sweden.
    Berglund, Birgitta
    Department of Psychology, Stockholm University, Sweden.
    Skedung, Lisa
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Aikala, Maiju
    Oy Keskuslaboratorio - Centrallaboratorium Ab (KCL), Espoo, Finland.
    Danerlöv, Katrin
    Institute for Surface Chemistry (YTK), Stockholm, Sweden.
    Kettle, John
    Oy Keskuslaboratorio - Centrallaboratorium Ab (KCL), Espoo, Finland.
    Rutland, Mark W.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Ytkemi.
    Multidimensional psychophysics: surface feel of printing paper as a function of physical propertiesManuskript (preprint) (Annet vitenskapelig)
  • 28.
    Asfaw Idosa, Berhane
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Inflammasome polymorphisms and the Inflammatory Response to Bacterial Infections2016Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    NLRP3 inflammasome; a key component of the innate immune system, can be activated by a number of pathogens and other threats of the body. Activation of the NLRP3 inflammasome triggers caspase-1 mediated maturationof IL-1β and IL-18. Polymorphisms Q705K and C10X are two gene variants of the NLRP3 inflammasome that combined or per se have been associated with higher risk and severity of chronic inflammation and excessive production of IL-1β. Host genetic factors have been found an important determinants of susceptibility of infectious diseases and disease outcome. The aims of this thesis were to investigate the association between polymorphisms Q705K and C10X with bacterial infections and the inflammatory response, moreover to determine the inflammasome activation state in healthy carriers of these polymorphisms. The data of the thesis show higher levels of IL-1β and IL-33 in healthy carriers of combined polymorphisms of Q705K and C10X as compared to non-carrier controls. This may provide individuals with combined polymorphisms a more robust innate immune response against pathogens, but could also lead to the onset of chronic inflammation, and excessive inflammation during acute infection. In addition, individuals with C10X polymorphism per se showed association with the presence of bacteremia as compared withhealthy blood donors. No association was found in severely ill patients with negative blood culture bottle. In addition, the results show that LOS of N. meningitidis is responsible for the priming and activating steps of the inflammasome. The non-LOS components were found to contribute to the priming step. A higher inflammatory response to N. meningitidis was found in individuals who were non-carriers of the polymorphisms than individuals with the Q705K and C10X per se or combined regardless of the strain of bacteria. Taken together, the gene variations of the NLRP3 inflammasome are of importance in explaining inter-individual variation in susceptibility to infectious diseases.

  • 29.
    Asfaw Idosa, Berhane
    et al.
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Jacobsson, Susanne
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Kelly, Anne
    Karolinska University Hospital, Stockholm, Sweden.
    Fredlund, Hans
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Persson, Alexander
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Särndahl, Eva
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Human gene variants that regulate the NLRP3 activity limit the production of Neisseria meningitidis-induced IL-1β and IL-18Manuskript (preprint) (Annet vitenskapelig)
  • 30.
    Asfaw Idosa, Berhane
    et al.
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Persson, Alexander
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Jacobsson, Susanne
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Demirel, Isak
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Fredlund, Hans
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Särndahl, Eva
    Örebro universitet, Institutionen för medicinska vetenskaper.
    Kelly, Anne
    Karolinska University Hospital, Stockholm, Sweden.
    LOS-dependent Neisseria meningitidis-induced caspase-1 activation in human neutrophilsManuskript (preprint) (Annet vitenskapelig)
  • 31.
    Aslani Asl, Ali
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Synthesis of new perchlorates from 4- nitropyridine 1-oxide by acylation and decarboxylation2011Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    4-Nitropyridine 1-oxide was reacted with bis(trichloromethyl) carbonate, carbonyl fluoride, methyland ethyl chloroformate. Of particular interest was to examine if denitrohalogenation occurs when 4-nitropyridine 1-oxide is treated with carbonyl fluoride which happens when 4-nitropyridine 1-oxidereacts with bis(trichloromethyl) carbonate. A reaction took place but what was formed is still amatter of question.

    Two new compounds, 1-(methyloxycarbonyloxy)- and 1-(ethyloxycarbonyloxy)-4-nitropyridiniumperchlorate were obtained when 4-nitropyridine 1-oxide and sodium perchlorate in acetonitrile werereacted with methyl and ethyl chloroformate, respectively.

    1-Ethyloxy-4-nitropyridinium perchlorate were formed when heating 1-(ethyloxy-carbonyloxy)-4-nitropyridinium perchlorate. The evolution of carbon dioxide ceased at 90 OC. The structuredetermination of the product was made by IR and1H-NMR spectroscopy. The methyl analogue onthe other hand was completely decarboxylated at 145 OC according to an IR spectrum. The finalstructure determination of the latter compound remains to be done. Both compounds are new.

    Experiments were also done in order to work out a simple method for synthesizing carbonyl fluoridefrom bis(trichloromethyl) carbonate and potassium fluoride using 18-crown-6 or tetrabutylammoniumbromide as phase transfer catalysts in several solvents, e.g. acetonitrile, nitromethane, propylenecarbonate. Carbonyl fluoride was formed but its purity remains to be settled.

  • 32.
    Aydin, Juhanes
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Senthil, Kumar K
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Sayah, Mahmoud J
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Wallner, Olov A
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Szabó, Kálmán J
    Synthesis and catalytic application of chiral 1,1'-Bi-2-naphthol- and biphenanthrol-based pincer complexes: selective allylation of sulfonimines with allyl stannane and allyl trifluoroborate.2007Inngår i: Journal of Organic Chemistry, Vol. 72, nr 13, 4689-4697 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    New easily accessible 1,1'-bi-2-naphthol- (BINOL-) and biphenanthrol-based chiral pincer complex catalysts were prepared for selective (up to 85% enantiomeric excess) allylation of sulfonimines. The chiral pincer complexes were prepared by a flexible modular approach allowing an efficient tuning of the selectivity of the catalysts. By employment of the different enantiomeric forms of the catalysts, both enantiomers of the homoallylic amines could be selectively obtained. Both allyl stannanes and allyl trifluoroborates can be employed as allyl sources in the reactions. The biphenanthrol-based complexes gave higher selectivity than the substituted BINOL-based analogues, probably because of the well-shaped chiral pocket generated by employment of the biphenanthrol complexes. The enantioselective allylation of sulfonimines presented in this study has important implications for the mechanism given for the pincer complex-catalyzed allylation reactions, confirming that this process takes place without involvement of palladium(0) species.

  • 33.
    Aydin, Juhanes
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Szabó, Kálmán
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Palladium-pincer complex catalyzed C-C coupling of allyl nitriles with tosyl imines via regioselective allylic C-H bond functionalization2008Inngår i: Organic Letters, ISSN 1523-7060, Vol. 10, nr 13, 2881-2884 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A mechanistically new palladium-pincer complex catalyzed allylation of sulfonimines is presented. This reaction involves C-H bond functionalization of allyl nitriles under mild conditions. The reaction proceeds with a high regioselectivity, without allyl rearrangement of the product. Modeling studies indicate that the carbon-carbon bond formation process proceeds via (η1-allyl)palladium pincer complex intermediates.

  • 34.
    B. Kumar, Ramakrishnan
    et al.
    Karolinska.
    Zhu, Lin
    KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Strukturell bioteknik.
    Hebert, Hans
    KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Strukturell bioteknik.
    Jegerschöld, Caroline
    Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy2017Inngår i: Journal of Visualized Experiments, ISSN 1940-087X, E-ISSN 1940-087X, nr 121Artikkel i tidsskrift (Fagfellevurdert)
  • 35. Backlund, Per
    et al.
    Heldal, Ilona
    Söderström, Ewa
    Lundberg, Lars
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Jonsson, Anders
    Högskolan i Borås, Institutionen för Vårdvetenskap.
    Maurin Söderholm, Hanna
    Högskolan i Borås, Institutionen Biblioteks- och informationsvetenskap / Bibliotekshögskolan.
    Pre-hospital training and simulation initiative2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Background The pre-hospital process is a complex one involving aspects such as medical skills as well as care taking, team performance, inter-organizational cooperation and communication. This calls for novel training methods and technology support. Our review of literature (covering the areas of pre-hospital care, training simulator technologies and methods and process modelling) indicates that the different aspects are typically trained in isolation, e.g. medical skills using patient simulators.Objective The pre-hospital training center project addresses the overall complexity of the pre-hospital process by taking all of the aspects into account when designing scenarios and technology support for training the complete prehospital process (covering alarm, on-scene activities, transportation and hand-over). This is indeed a challenging task as we need to develop both training methods and technology support for a very complex training situation.Methods The project will develop a prototype scenario along with technology support to enact it. The training scenario will involve many of the aspects listed above and will be tested in a field experiment with ambulance personnel. Results The expected outcome of the project is a platform for establishing a pre-hospital simulation and training center. The initial technologies, research results and experiences will be used to form a consortium for further work and development. Conclusions We have identified a need for a pre-hospital training center with the unique and ambitious idea of covering the entire pre-hospital process as well as its many interacting aspects. To the best of our knowledge this approach is not at all common and we expect the complexity to be so high that it is a challenging enough research area that can only be addressed if we have a well-designed simulation and training center in place with all the different areas of knowledge represented, i.e. pre-hospital medicine as well as simulation and visualization technology.

  • 36.
    Baleani, Massimiliano
    et al.
    Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Bologna, Italy.
    Fognani, Roberta
    Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Bologna, Italy.
    Feresini, Chiara
    Centro Ceramico Bologna, Bologna, Italy.
    Öhman, Caroline
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Spagnolo, Claudia
    Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Bologna, Italy.
    Baruffaldi, Fabio
    Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Bologna, Italy.
    Real wet density of bone tissue: Does it depend on tissue type and subject?2014Inngår i: Proceedings of 7th World Congress of Biomechanics, 2014, 2014Konferansepaper (Fagfellevurdert)
  • 37.
    Becker, Richard
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Johnsson, Mats
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
    Berger, Helmuth
    Crystal Structure of the New Cobalt Tellurite Chloride Co5Te4O11Cl42007Inngår i: Zeitschrift für Anorganische und Allgemeines Chemie, ISSN 0044-2313, E-ISSN 1521-3749, Vol. 633, nr 3, 422-424 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The crystal structure of the new compound Co5Te4O11Cl4 is described. It crystallizes in the triclinic system, space group P-1 with the unit cell parameters a = 822.26(8) pm, b = 1029.7(1) pm, c = 1031.1(1) pm, = 110.80(1)°, β = 97.950(9)°, = 98.260(9)° and Z = 2. The structure is layered along the bc–plane and built by [CoO5Cl], [CoO4Cl2] and [CoO4Cl] polyhedra sandwiched by [TeO3E] and [TeO4E] polyhedra. The layers can be regarded as infinite molecules without any net charge and only weak van der Waals forces connect them to each other. The halides and the lone-pair, E, of TeIV protrude from the layers.

  • 38.
    Beckman Sundh, Ulla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi.
    Studies on Phosphohistidine Phosphatase 1: What? Where? Why?2012Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Phosphohistidine phosphatase 1 (PHPT1) is a small protein, consisting of 125 amino acids, that catalyzes the dephosphorylation of histidine but does not have any activity towards other phosphorylated amino acids. PHPT1 was identified in 2002, and is so far the only mammalian histidine phosphatase known, but still little is known about its physiological role. No mammalian histidine kinases have hitherto been identified.

    Phosphorylation is one of the most important ways in which the structure and activity of a protein may be changed after translation. Proteins are phosphorylated on the side chain of amino acid residues. When a hydroxyl is phosphorylated the result is a phosphoester and when a nitrogen is phosphorylated the result is a phosphoamidate. Histidine may be phosphorylated on either of the two nitrogens of the imidazole ring of the side chain. The resulting phosphoamidate bond is labile and rich in energy, which makes histidine phosphorylation highly reversible and flexible. However, histidine phosphorylation is less studied than that of the phosphoesters due to the acid lability of the phosphoamidate bond.

    The work described in this thesis was focused on further elucidating the physiological role of PHPT1. Amino acid residues of importance for the activity of PHPT1 were identified, and mutants with decreased phosphatase activity were produced. These mutants have been used in studies on the function of PHPT1. By using immunohistochemical methodology the localization of PHPT1 in both mouse and human tissues was determined, with mainly similar results. A general finding was that expression of PHPT1 was high in epithelial cells with short turnover time, indicating that PHPT1 may have an important role in proliferating cells. We have also developed a comparatively fast and simple screening method for determination of PHPT1 activity. Since research in this field has been hampered by the lack of efficient and practical methodology, hopefully this new method will be an asset in search of inhibitors for PHPT1, which in turn may be used for detection of the elusive mammalian histidine kinases, the finding of which may give major breakthroughs in the field.

  • 39.
    Bengtsson, Åsa
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Kemi.
    Solubility and Surface Complexation Studies of Apatites2007Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Apatites are a diverse class of phosphate minerals that are important in a great variety of natural and industrial processes. They are, for example, used as raw material in fertiliser production and in the remediation of metal-contaminated soils. Hydroxyapatite Ca5(PO4)3OH, (HAP) and fluorapatite Ca5(PO4)3F, (FAP) are similar to the biological apatite that is the main constituent of mammalian bone and teeth, and they are therefore promising materials for artificial bone and tooth implants.

    This thesis is a summary of four papers with focus on dissolution and surface complexation reactions of HAP and FAP in the absence and presence of both organic ligands and the natural and commonly occurring iron oxide goethite (α-FeOOH).

    The dissolution and surface complexation of HAP and FAP was investigated with a combination of different techniques. Potentiometric acid/base titrations and batch experiments were combined with X-ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) Spectroscopy to generate dissolution and surface complexation models for both apatites. The results from these studies showed that both apatites form surface layers that are different from their bulk compositions when equilibrated in aqueous solutions. The modeling efforts predicted speciation of these surfaces as well as the concentration of the dissolution products in the solution.

    The interaction between organic ligands and the apatite surfaces was also investigated and the results from this study show that the organic ligands form outer-sphere complexes on the apatite surfaces over a large pH interval, and that this adsorption enhances the dissolution of apatites.

    The presence of goethite also enhances the dissolution of FAP as it acts as a sink for the phosphate released from FAP. Phase transformation in this system was detected using ATR-FTIR as the phosphate adsorbed to the goethite surface precipitates as FePO4 (s) after approximately 15 days of reaction time. This changes the speciation, and possibly also the bioavailability of phosphate in this two-mineral system.

  • 40.
    Bennström, Evelina
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Investigation of Ligand Effect on Regio- and Stereoselectivity in the Heck Reaction2009Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report describes the investigation of how the structure of the ligand influences the product distribution in a series of model Heck reactions. The results showed that the ligand had a strong influence on the selectivity in all cases. It also describes efforts to build prediction models through PLS modelling of experimental data against calculated descriptors for the ligands in silico. In addition, a subset of the data was used to investigate the ability of DFT calculations to predict the selectivity.

  • 41.
    Berggren, Gustav
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fotokemi och molekylärvetenskap.
    Mimicking Nature – Synthesis and Characterisation of Manganese Complexes of Relevance to Artificial Photosynthesis2009Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The development of efficient catalyst for water oxidation is of paramount importance to artificial photosynthesis, but before this can be achieved a deeper understanding of this reaction is essential. In nature this reaction occurs in a tetranuclear Mn-cluster which serves as the work-horse of oxygenic photosynthesis. This thesis summarises my efforts at developing molecular systems capable of mimicking this complex employing a biomimetic approach.

    Three different approaches towards this goal are described here-in. The first section describes a screening study, in which a number of manganese complexes were tested to see whether or not they were capable of catalysing the formation of dioxygen when treated with different oxidants (Papers I). For those reactions in which dioxygen formation was observed the reactions were repeated in labelled water and the incorporation of labelled O-atoms was studied by mass spectrometry. This allowed us to determine to what extent water was the source of the evolved dioxygen (Papers II-III).

    In Chapter three a reported catalyst and a derivative thereof is studied in depth. The influence of changes to the ligand on the oxygen–oxygen bond forming reaction could unfortunately not be reliably addressed, because of the instability of the complexes under “catalytic” conditions. Nevertheless, the study allowed us to revise the “carboxylate shift”-mechanism suggested in the literature (Papers IV-V).

    Chapter four describes the continuation of my work on ligands featuring the carboxylate ligand motif first introduced in Chapter three. In this study ligands containing multiple binding pockets were designed and synthesised (Paper VI).

    A better understanding of the mechanism in the natural water oxidising enzyme will facilitate the design of biomimetic complexes, this is discussed in Chapter five. In this work model complexes (Paper VII) are used to study the mechanism by which natures own water oxidising catalyst performs this reaction.

  • 42.
    Berglund, Anders
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
    Kettaneh, Nouna
    Umetrics Inc., Kinnelon, NJ, USA.
    Uppgård, Lise-Lott
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
    Wold, Svante
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
    Bendwell, Nancy
    Tembec Inc., Temiscaming, Quebec, Canada.
    Cameron, Dave R
    Tembec Inc., Temiscaming, Quebec, Canada.
    The GIFI approach to non-linear PLS modeling2001Inngår i: Journal of Chemometrics, ISSN 0886-9383, E-ISSN 1099-128X, Vol. 15, nr 4, 321-36 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The GIFI approach to non-linear modeling involves the transformation of quantitative variables to a set of 1/0 dummies in a similar manner to the way qualitative variables are coded. This is followed by analyzing the sets of 1/0 dummies by principal component analysis, multiple regression or, as discussed here, PLS. The patterns of the resulting coefficients indicate the nature of the non-linearities in the data. Here the potential uses and limitations of PLS regression, in combination with four variants of GIFI coding, are investigated using both simulated and empirical data sets.

  • 43. Berglund, P.
    et al.
    Hedenström, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Hult, K.
    Controlling lipase enantioselectivity for organic synthesis: Meeting abstract2000Inngår i: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2000, Vol. 219, U219- s.Konferansepaper (Fagfellevurdert)
  • 44.
    Bergström, Gunnel
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Ekman, Pia
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Dahlqvist, Ulla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Humble, Elisabet
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Engström, Lorentz
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Subtilisin-catalyzed removal of phosphorylated site of pig liver pyruvate kinase without inactivation of the enzyme1975Inngår i: FEBS Letters, ISSN 0014-5793, E-ISSN 1873-3468, Vol. 56, nr 2, 288-291 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 45.
    Bergström, Gunnel
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Ekman, Pia
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Humble, Elisabet
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Engström, Lorentz
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk och fysiologisk kemi.
    Proteolytic modification of pig and rat liver pyruvate kinase including the phosphorylatable site1978Inngår i: Biochimica et Biophysica Acta, ISSN 0006-3002, Vol. 532, nr 2, 259-267 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The phosphorylated or phosphate-accepting site of pyruvate kinase from pig and rat liver was removed without inactivation by incubation with subtilisin. At different time intervals the subtilisin was inactivated with phenylmethylsulfonyl fluoride and the amount of remaining phosphorylatable or phosphorylated sites of pyruvate kinase estimated by incubation with an excess of [32P]-ATP and protein kinase. It was found that to get the same rate of modification the subtilisin concentration required to modify unphosphorylated pyruvate kinase was approximately ten times higher than that used for removal of the phosphorylated site of phosphorylated site of phosphorylated enzyme. It was shown that the proteolytically-modified pyruvate kinase had an increased apparent Km for phosphoenolpyruvate without a change in V, when compared to unmodified unphosphorylated and phosphorylated pyruvate kinase. The removal of the phosphorylated site was not associated with loss of the allosteric sites for ATP and Fru-1,6-P2. The possibility that phosphorylation of the pyruvate kinase increases its degradation rate in vivo is briefly discussed.

  • 46.
    Bergström, Lennart
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Sörensen, Malin H
    Boon Sing Ng, Jovice
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Alberius, Peter C.A.
    Improved enzymatic activity of Thermomyces lanuginosus lipase immobilized in a hydrophobic particulate mesoporous carrier2010Inngår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 343, 359-365 s.Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Lipase from Thermomyces lanuginosus has been immobilized within particulate mesoporous silica carriers, with either hydrophilic or hydrophobic supporting surfaces, produced by the newly developed emulsion and solvent evaporation (ESE) method. The Michaelis–Menten model was used to calculate the parameters related to the enzymatic activity of lipase i.e. the turnover number, kcat, and the specific activity. The specific activity was improved by immobilization of lipase onto the hydrophobic support, compared to lipase immobilized onto the hydrophilic support and lipase free in solution. The enhanced enzymatic activity of lipase onto a hydrophobic support was attributed to interfacial activation of the Thermomyces lanuginosus lipase when it is attached to a hydrophobic surface and a reduced denaturation. Confocal scanning laser microscopy (CLSM) studies, of fluorescently tagged lipase, showed that leakage of the lipase from the mesoporous particles was limited to an initial period of only a few hours. Both the rate and the amount of lipase leached were reduced when the lipase was immobilized onto the hydrophobic support.

  • 47.
    Bielawski, Marcin
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Olofsson, Berit
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Efficient one-pot synthesis of bis(4-tert-butylphenyl)iodonium triflate2009Inngår i: Organic Syntheses, ISSN 0078-6209, Vol. 86, 308-314 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 48.
    Bixo, Marie
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk biovetenskap, Patologi.
    Ovarian steroids in rat and human brain: effects of different endocrine states1987Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Ovarian steroid hormones are known to produce several different effects in the brain. In addition to their role in gonadotropin release, ovulation and sexual behaviour they also seem to affect mood and emotions, as shown in women with the premenstrual tension syndrome. Some steroids have the ability to affect brain excitability. Estradiol decreases the electroshock threshold while progesterone acts as an anti-convulsant and anaesthetic in both animals and humans. Several earlier studies have shown a specific uptake of several steroids in the animal brain but only a few recent studies have established the presence of steroids in the human brain.

    In the present studies, the dissections of rat and human brains were carried out macroscopically and areas that are considered to be related to steroid effects were chosen. Steroid concentrations were measured by radioimmunoassay after extraction and separation with celite chromatography. The accuracy and specificity of these methods were estimated.

    In the animal studies, immature female rats were treated with Pregnant Mare's Serum Gonadotropin (PMSG) to induce simultaneous ovulations. Concentrations of estradiol and progesterone were measured in seven brain areas pre- and postovulatory. The highest concentration of estradiol, pre- and postovulatory, was found in the hypothalamus and differences between the two cycle phases were detected in most brain areas. The preovulatory concentrations of progesterone were low and the highest postovulatory concentration was found in the cerebral cortex.

    In one study, the rats were injected with pharmacological doses of progesterone to induce "anaesthesia". High uptake of progesterone was found and a regional variation in the formation of 5<*-pregnane-3,20-dione in the brain with the highest ratio in the medulla oblongata.

    Concentrations of progesterone, 5a-pregnane-3*20-dione, estradiol and testosterone were determined in 17 brain areas of fertile compared to postmenopausal women. All steroids displayed regional differences in brain concentrations. Higher concentrations of estradiol and progesterone were found in the fertile compared to the postmenopausal women.

    In summary, these studies show that the concentrations of ovarian steroids in the brain are different at different endocrine states in both rats and humans and that there are regional differences in brain steroid distribution.

  • 49.
    Björling, Thomas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Synthesis and characterisation of Zintl hydrides2008Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The synthesis, structural characterisation and the properties of the Zintl hydrides AeE2H2 and AeAlSiH (Ae = Ba, Ca, Sr; E = Al, Ga, In, Si, Zn) are reported. The first hydride in this class of compounds is SrAl2H2 which was discovered under an experiment by Gingl, who hydrogenated SrAl2 at various temperatures. (Gingl et al, Journal of Alloys and Compounds 306 (2000) 127-132). The intention was to form alanates, e.g. AlH4-, by terminating the three dimensional four connected aluminium network in SrAl2. The new hydride, SrAl2H2, has a partially conserved aluminium network. The three dimensional anionic network in SrAl2 is reduced to two dimensions in the hydride, with aluminium bonded to both aluminium and hydrogen. This type of bonding configuration has not been observed before.

    The hydrogenation of SrAl2 is straight forward, 190 oC and 50 bar, compared to the difficult synthesis of alanates and alane, AlH3. The latter synthesises uses aluminium in its zero oxidation state in contrast to the synthesis of SrAl2H2 from SrAl2. (In the SrAl2-precursor aluminium is reduced by the electropositive metal to -I.) Thus, the discovery shows a different route to alanates by using precursors with aluminium in a reduced state. If SrAl2H2 is further hydrogenated at 250 oC the two dimensional network breaks and Sr2AlH7 forms.

    We wanted to investigate if SrAl2H2 was a singularity or if other similar compounds exist. We wanted to study how hydrogenation of precursors similar to the aluminide result in 1) new routes to compounds with high hydrogen content, as alanates, 2) to investigate how the E-H bond is affected as function of the network composition among different ternary hydrides, in particular BaAlxSi2-xHx, and choice of active metal.

    BaGa2H2 and SrGa2H2, two hydrides isostructural with SrAl2H2, were synthesized from its precursors BaGa2 and SrGa2. In addition three ternary hydrides BaAlSiH, CaAlSiH and SrAlSiH were manufactured from their related AeAlSi precursors.

    All powders were characterized by neutron and x-ray diffraction methods.

    An increased stability towards water/moisture compared to ordinary saline hydrides was noticed, especially for the ternary hydrides. Heat stability was measured with DSC (differential scanning calorimetry). The hydrides BaGa2H2 and SrGa2H2 decompose around 300 oC at 1 atm. This is similar to isostructural SrAl2H2. The ternary hydrides BaAlSiH and SrAlSiH decompose at 600 oC, at 1 atm, which is the highest noticed temperature for compounds with Al-H bonds. Inelastic neutron scattering experiments showed that these hydrides Al-H and Sr-H bonds are really weak, even weaker then the Al-H interactions in alanates and alanes. These hydrides are probably stabilized be their lattices. The electric properties among the ternary hydrides were measured with IR-spectroscopy (diffuse reflectance). The ternary hydrides, AeAlSiH, are indirect semi conductors. BaGa2H2 and SrGa2H2 are conductors. The ternary hydrides, AeAlxSi2-xHx, may have adjustable band gaps, which we were not able to determine.

    This work is leading into a new research area within the field of metal hydrides.

  • 50.
    Blom, Elisabeth
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi.
    Karimi, Farhad
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi.
    Eriksson, Olof
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Hall, Håkan
    Långström, Bengt
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi.
    Synthesis and in vitro evaluation of 18F-β-carboline alkaloids as PET ligands2008Inngår i: Journal of labelled compounds & radiopharmaceuticals, ISSN 0362-4803, E-ISSN 1099-1344, Vol. 51, nr 6, 277-282 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A one-step 18F-labelling strategy was used to prepare four 18F-labelled analogues of 7-methoxy-1-methyl-9H-β-carboline (harmine): 7-(2-[18F]fluoroethoxy)-1-methyl-9H-β-carboline (5), 7-(3-[18F]fluoro-propoxy)-1-methyl-9H-β-carboline (6), 7-[2-(2-[18F]fluoroethoxy)ethoxy]-1-methyl-9H-β-carboline (7), and 7-{2-[2-(2-[18F]fluoroethoxy)ethoxy]-ethoxy}-1-methyl-9H-β-carboline (8). These were synthesized as potential PET ligands for monoamine oxidase A. A solution of pure labelled compound in buffer was obtained in < 70 min from end of radionuclide production, with a decay-corrected yield of up to 23%. The average specific binding to MAO-A in rat brain, determined by autoradiography experiments, was highest for compounds 7 and 8 (89 ± 2 and 96 ± 1% respectively), which was obtained at < 1 nM radioligand concentration.

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