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  • Articles: DFG German National Licenses  (2)
  • 1980-1984  (2)
  • 1955-1959
  • 1940-1944
  • 1860-1869
  • Acid-sensitive step  (1)
  • Cyclotella  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Planta 160 (1984), S. 6-11 
    ISSN: 1432-2048
    Keywords: Ascorbic acid biosynthesis ; Bacillariophyta ; Cyclotella ; Glucosamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract l-Ascorbic acid (AA) production in cells of Cyclotella cryptica Reimann, Lewin, Guillard (Bacillariophyceae) is enhanced when darkadapted cells are exposed to light.Heterotrophically grown cells incubated with d-[6-3H,6-14C]glucose and d-[1-3H,6-14C]glucose (2 h in dark followed by 15 h light) produced labeled AA with significantly different ratios of 3H and 14C. Comparisons of labeling patterns in AA and chitin-derived d-glucosamine support a path of conversion in Cyclotella from d-glucose to AA that “inverts” the carbon chain of the sugar. This process resembles similar conversions found in AA-synthesizing animals and species from two other algal classes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: Acid-sensitive step ; Nitrogen content ; Nitrogen fixation ; Pisum sativum ; Rhizobium leguminosarum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Experiments were performed to measure the pH-sensitive steps in nodulation and symbiotic fixation byPisum sativum and isolate RP-212-1 ofRhizobium leguminosarum. An aeroponic system with rigorous pH control was used to obtain numerous effective nodules. After exposure to various pH levels, the following responses were measured: (1) legume root growth and development, (2) survival and growth rate of a single effective bacterial isolate, (3) degree of nodulation, (4) rate of nitrogen fixation, (5) plant biomass, and (6) nitrogen content of plants. Both bacterial growth and root development were adequate at all pH levels from 4.4 to 6.6, but efficient nodulation and nitrogen fixation did not occur at pH 4.8 and below. The processes required for symbiosis were about 10 times as sensitive to acidity as either bacterial growth or root growth alone. Nodulation was the most acid-sensitive step.
    Type of Medium: Electronic Resource
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