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  • 1.
    Andersson, Barbro
    Umeå University, Faculty of Science and Technology.
    Analysis of plant growth regulating substances1982Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Natural plant growth regulators (phytohormones) are a group of organic compounds which, in very small amounts, act as regulators of physiological processes in plants.Methods were developed for the analysis of phytohormones in samples from Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris (L.) Karst»). Identification of abscisic acid, 3-indoleacetic acid, gibbe-rellin Ag and the conjugate N-(3-indoleacetyl)aspartic acid was performed by GC-MS as their methyl esters. A quantitative determination of abscisic acid was made by GC-ECD and this method was also applied to anther samples of Anemone canadensis. 3-Indole-acetic acid and N-(3-indoleacetyl)aspartic acid were quantified by reversed-phase HPLC and spectrofluorimetric detection. Dichlorophene, used as a growth regulator in containerized seedlings of pine and spruce, was analysed by GC-MID in peat and paper.

  • 2.
    Berglin, Ewa
    et al.
    Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
    Edlund, Maj-Britt K.
    Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
    Nyberg, Göran K.
    Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
    Carlsson, Jan
    Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
    Potentiation by L-cysteine of the bactericidal effect of hydrogen peroxide in Escherichia coli1982In: Journal of Bacteriology, ISSN 0021-9193, E-ISSN 1098-5530, Vol. 152, no 1, p. 81-88Article in journal (Refereed)
    Abstract [en]

    Under anaerobic conditions an exponentially growing culture of Escherichia coli K-12 was exposed to hydrogen peroxide in the presence of various compounds. Hydrogen peroxide (0.1 mM) together with 0.1 mM L-cysteine or L-cystine killed the organisms more rapidly than 10 mM hydrogen peroxide alone. The exposure of E. coli to hydrogen peroxide in the presence of L-cysteine inhibited some of the catalase. This inhibition, however, could not fully explain the 100-fold increase in hydrogen peroxide sensitivity of the organism in the presence of L-cysteine. Of other compounds tested only some thiols potentiated the bactericidal effect of hydrogen peroxide. These thiols were effective, however, only at concentrations significantly higher than 0.1 mM. The effect of L-cysteine and L-cystine could be annihilated by the metal ion chelating agent 2,2'-bipyridyl. DNA breakage in E. coli K-12 was demonstrated under conditions where the organisms were killed by hydrogen peroxide.

  • 3. Långström, B
    et al.
    Antoni, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Halldin, Christer
    Svärd, Hans
    Bergson, Göran
    Synthesis of some 11C-labelled alkaloids1982In: Chemica Scripta, Vol. 20, p. 46-49Article in journal (Refereed)
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