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  • 1. Abtahi, Zhohreh
    et al.
    Millati, Ria
    Niklasson, Claes
    Taherzadeh, Mohammad J.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Ethanol production by Mucor indicus at high glucose and ethanol concentrations2010Ingår i: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 22, nr 3-4, s. 83-89Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Mucor indicus was cultivated under aerobic and anaerobic conditions to study its tolerance against high concentration of glucose up to 350 g/L and ethanol up to 120 g/L present in the medium. The fungus could grow well even in 350 g/L glucose and produce ethanol, but it was able to assimilate the entire glucose when its concentration was less than 200 g/L. On the other hand, M. indicus produced ethanol as the main product with yield and concentration up to 0.45 g/g and 73 g/L, respectively, while glycerol, its only major byproduct, was produced up to 24 g/L. However, the fungus was not so tolerant against exogenously added ethanol, and it could not grow with more than 40 g/L added ethanol to the culture. Under aerobic conditions, M. indicus displayed different morphology, switching from long filamentous to yeast-like growth forms by increasing initial glucose concentration. This implies that yeast-like growth can be induced by growing M. indicus at high glucose concentration. Under anaerobic conditions, only one yeast-like form was observed.

  • 2.
    Elofsson, U
    et al.
    YKI – Ytkemiska institutet.
    Millqvist-Fureby, A
    YKI – Ytkemiska institutet.
    Drying of probiotic micro-organisms in aqueous two-phase systems2000Ingår i: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 12, s. 279-286Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Spray-drying has been investigated as a method for preparation of dry formulations of live bacteria with high viability and high cell density. The concept used in this study has been to disperse the bacteria in an aqueous polymer containing two-phase system (ATPS), compatible with the micro-organisms. The cells partition to one phase, which is separated from the other phase in a droplet dispersion or bi-continuous system. The exclusion of the dispersed phase and the bacteria from the particle surface is studied by ESCA (electron spectroscopy for chemical analysis), which gives an estimate of the molecular composition at the powders surface. A measure of the powder dissolution rate was obtained, this property was highly related to the molecular composition at the powder surface. The effect of additives was studied by adding disaccharides and proteins to the ATPS before drying. The probiotic bacteria Enterococcus faecium M74 and Lactobacillus plantarum have been used as model organisms for this study. The viability after drying and 5 weeks storage has been evaluated by plate counting and was found to be higher in the ATPS compared to when single phase polymer solutions were used as drying matrices. Comparisons were made with freeze-drying of the same systems and also the effect of cell status before the drying step has been evaluated.

  • 3. Ho Ky, Q. M.
    et al.
    Lennartsson, P.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Taherzadeh, M. J.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Dimorphism of Mucor indicus: different gene expressions between yeast-like and filamentous growth2013Ingår i: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 25, nr 1, s. 1-8Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Aim: Mucor indicus is a zygomycetes fungus with several advantages. Its ethanol yield from hexoses rivals that of Saccharomyces cerevisiae and it is capable of producing ethanol from xylose in limited aerobic conditions. It is also able to ferment dilute acid hydrolysate and is known to be dimorphic; able to grow in both filamentous and yeast-like modes. Methods: In this study, the difference between yeast-like and filamentous cells of M. indicus was investigated using modern polymerase chain reaction (PCR) techniques. Four mRNA sequences were detected with a higher expression in the filamentous growth form than in the yeast-like, by a factor of 1.3-4.2. One of the sequences was novel and three have been detected in another species of Mucor, M. circinelloides, coding for a chitin synthase, a proteasome and a sigma 70 factor. Results and conclusion: The novel sequence exhibited the largest difference in expression and was subjected to knock-down. However, it proved to be best suited for detection of emerging growth patterns, since the knock-down had little effect on the developing growth form. With the results of this study, an important step towards understanding the difference in the dimorphic behaviour exhibited by M. indicus, as well as other members of the genus Mucor, has been taken. Potentially it could also be used as one of the tools for the control of the dimorphic behaviour of M. indicus, and other species of the Mucor genus.

  • 4.
    Tolmachev, V
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Orlova, A
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Update on Affibody molecules for in vivo imaging of targets for cancer therapy2009Ingår i: Minerva biotecnologica (Testo stampato), ISSN 1120-4826, E-ISSN 1827-160X, Vol. 21, nr 1, s. 21-30Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An increasing specificity of the cancer treatment requires an accurate detection of cancer-associated molecular targets to avoid over- and undertreatment. Radionuclide molecular imaging is a pronitising way for visualisation of such targets. Affibody molecules (Affibody (R) molecules), small (7 kDa) robust scaffold proteins constitute a new promising class of high-affinity molecular probes for in vivo molecular imaging. Pre-clinical studies demonstrated a great potential of derivatives of Z(HER2:342) Affibody molecule to visualise expression of HER2 in tumour xenografts. Robustness of the Affibody scaffold enabled labelling in harsh conditions without loosing specificity of the HER2-binding. This paper provides an overview of the recent development of Affibody molecules. During the recent year, an important achievement was the development of site-specific labelling of Affibody molecules providing well-characterised uniform conjugates with defined biodistribution and targeting properties. The site-specific labelling was obtained either by an incorporation of chelators during peptides synthesis of Affibody molecules or by an introduction of a single cysteine in the originally cysteine-free Affibody scaffold and the use of a thiol-directed coupling. A feasibility of modification of the biodistribution of Affibody molecules by different chelators was another interesting fmding. This was demonstrated during development of mercaptoacetyl-containing peptide based chelators for Tc-99m-labelling of Affibody molecules. Several positron-emitting labels enabled the use of advantages of PET for Affibody-mediated radionuclide imaging. it was demonstrated that the rapid targeting of Affibody molecules is compatible with the use of such labels as Ga-68 and F-18.

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