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  • Acyl lipid formation  (1)
  • Nicotine  (1)
  • Novel Pigments  (1)
  • 1990-1994  (1)
  • 1970-1974  (2)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Inhibition of carotenoid synthesis in Myxococcus fulvus (Myxobacterales) (1974)
    Springer
    Archives of microbiology 97 (1974), S. 217-226 
    Details
    ISSN: 1432-072X
    Keywords: Myxobacteria ; Carotenoid Glucosides ; Carotenoid Synthesis ; Nicotine ; Diphenylamine ; Herbicides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. The inhibitory effects of CPTA, nicotine, DPA, and San 6706 on carotenogenesis in Myxococcus fulvus were investigated. 2. The effects of CPTA, D-nicotine, and L-nicotine were very similar. The action of the drugs wasadditive. The cyclization was inhibited at low doses, the introduction of the hydroxyl group at C-1′ at higher doses. Lycopene accumulated at high drug concentration. The mode of action of the inhibitors is discussed. 3. In a carotenoid mutant of M. fulvus a stimulation of the “7,8-dehydrogenase” by CPTA was observed. 4. The specific carotenoid content of bacteria was increased by DPA due to an enhanced formation of phytoene. At low doses of DPA small amounts of an intermediate carotenoid glucoside ester, a 7,8-dihydro derivative, were detected. 5. DPA was taken up by the plasma membrane. Quantitative removal of DPA by washing was not possible. 6. San 6706 specifically and reversibly blocked the desaturation of phytoene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403061
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  • 2
    Electronic Resource
    Electronic Resource
    The pigments of Flexibacter elegans: Novel and chemosystematically useful compounds (1974)
    Springer
    Archives of microbiology 101 (1974), S. 131-144 
    Details
    ISSN: 1432-072X
    Keywords: Flexibacter ; Cytophaga ; Novel Pigments ; Flexirubin ; Chemosystematic Markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. Flexibacter elegans Fx e1 contains 3 pigments; their quantitative proportion is 2.5 : 2.5 : 95%. The absolute pigment content is 0.6–0.8 μg per mg dry cells. 2. Contrary to statements in the literature, these pigments are not carotenoids. This can be deduced from their electronic spectra which lack fine structure and are pH-dependent; from their resistance to photooxidation; from their failure to incorporate 14C-mevalonate; and from their mass spectra which do not show the M-92 and M-106 fragments typical for carotenoids. 3. The main pigment is characterized in detail; it has been named flexirubin. 4. The new pigments are widely distributed among members of the Cytophaga-Flexibacter group and seem to be valuable chemosystematic markers. 5. Specific pigment content of the bacteria does neither change along the growth curve, nor under illumination. Low pH or high phosphate concentrations depress specific pigment content. 6. The taxonomical position of experimental strain Fx e1 is discussed: The organism shows a cyclic change in cell shape. In young cultures there are long and very agile thread cells which fragment later in culture development, until finally only very short rods remain. A redefinition of the genus Flexibacter based on this shape change is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455933
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  • 3
    Electronic Resource
    Electronic Resource
    Prenyl lipid and fatty-acid synthesis in isolatedAcetabularia chloroplasts (1990)
    Springer
    Planta 181 (1990), S. 229-233 
    Details
    ISSN: 1432-2048
    Keywords: Acetabularia ; Acyl lipid formation ; Chloroplast (fatty-acid synthesis) ; Fatty acid (synthesis) ; Prenyl lipid formation ; Mevalonate pathway
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A gentle procedure allowed the isolation of intact and highly active chloroplasts from the unicellular green algaAcetabularia mediterranea. These chloroplasts incorporated carbon from NaH14CO3 into fatty acids and prenyl lipids at a rate of about 20–50 nmol carbon· (mg chlorophyll)−1·h−1. Most of the fatty acids formed in vitro were esterified in galactolipids. The main prenyl lipids synthesized were the chlorophyll side chain, intermediates of the carotenogenic path, α-and β-carotene, as well as lutein. Large amounts of [1-14C]acetate were incorporated, but exclusively into fatty acids.Isopentenyl diphosphate was a good substrate for prenyl-lipid formation in hypotonically treated chloroplasts. The envelope of intact chloroplasts, however, was impermeable to this compound. Intermediates of the mevalonate pathway were not accepted as precursors under conditions whereisopentenyl diphosphate was well incorporated. The results show that the lipid biosynthetic pathways in the plastids ofAcetabularia, a member of the ancient family of Dasycladaceae, are very similar to those in higher-plant plastids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411543
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