04 Fakultät Energie-, Verfahrens- und Biotechnik

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/5

Browse

Filters

1975 - 19783

Settings

Author: search.filters.author.Kühn, BarbaraEnd date: 1979

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    ItemOpen Access
    Short-term effects of cytokinins on the lipid fatty acids of green leaves
    (1978) Kull, Ulrich; Kühn, Barbara; Schweizer, Jürgen; Weiser, Helmut
    Isolated shoots of Coleus blumei and isolated leaves from this species and from Impatiens sultani were fed zeatin for different periods. High doses of the hormone (100 μg/ml) caused a measurable effect on lipid fatty acid composition after a two-hour feeding period in isolated leaves of Coleus. The maximum effects were at 20–30 μg zeatin taken up per g fresh weight. With the leaves of Impatiens, higher doses of the hormone were needed to obtain optimal effects. In both species, the proportion of linolenic acid increased and that of palmitic acid decreased. For higher concentrations, the reverse was true. The effects of the hormone on the fatty acids of glycolipids were more apparent than on those of phospholipids. The results are discussed in view of the general importance of dose-response curves for cytokinin effects and the possible effects on cell membranes.
  • Thumbnail Image
    ItemOpen Access
    Influence of zeatin and gibberellin on adenosine-3',5' -cyclic monophosphate levels of Impatiens leaves
    (1975) Kull, Ulrich; Kühn, Barbara
    The content of adenosine-3',5'-cydic monophosphate (cAMP) in leaves of Impatiens sultani Hook was measured by a protein-binding assay. A preceding administration of the natural cytokinin zeatin causes a diminution of the cAMP level. Administration of gibberellin (GA 3) does not bring about any variations. There is no indication that cAMP is acting as a secondary messenger of either phytohormone. Theophylline does not increase the content of cAMP found in the leaves.
  • Thumbnail Image
    ItemOpen Access
    On some constituents of Bosea yervamora fruits
    (1978) Kull, Ulrich; Kühn, Barbara
    In fruits of Bosea yervamora L. the occurrence of a betalain (betacyan) is established. Therefore, from a chemotaxonomic view, Bosea (resp. Boseaceae) must belong to the Caryophyllales (Centrospermae). The fruits contain the sugars glucose, fructose, sucrose, raffinose, and stachyose. The fatty-acid pattern of the saponifiable lipids of tbe fruits shows high percentages of palmitic, stearic and oleic acids.