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'Chlorella fusca' in keywords Facet   Publication Year 1989  [X]
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1989[X]
1Author    Berthold Scheffczyk, IngoD. Am, L.Horst GrimmeRequires cookie*
 Title    PS IIa/ß Heterogeneity during the Cell Cycle of the Unicellular Green Alga Chlorella fusca  
 Abstract    Fluorescence induction m easurem ents indicate a PS II(L ,p heterogeneity in the unicellular green alga Chlorella fusca. Under normal light the relative amount of PS II" is decreasing from 63% to 43% during the first 8 h o f the cell cycle. The rate constant ka shows a concom itant decrease by 20% in the first 4 h. The relative am ount and antenna size of PS IIa is restored in the dark. In contrast, PS II(rcentres show the sam e rate constant during the whole cell cycle. Under low light ka is increased by approximately 30% over the cell cycle, whereas no change o f kp is observed. It is concluded that the PS II organization of Chlorella is changed both during the cell cycle and the adaptation to light intensity by a com plex regulation (i) involving the antenna size o f a-centres and (ii) changing the quantitative relationship of fast and slow reaction centres. 
  Reference    Z. Naturforsch. 44c, 243 (1989); received Septem ber 14/Decem ber 22 1988 
  Published    1989 
  Keywords    PS II H eterogeneity, Green A lgae, Chlorella fusca, Cell Cycle, Light Intensity 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0243.pdf 
 Identifier    ZNC-1989-44c-0243 
 Volume    44 
2Author    Susanne Biedlingmaier, A.Hlert SchmidtRequires cookie*
 Title    Sulfate Transport in Normal and S-Deprived Chlorella fusca  
 Abstract    Sulfate uptake into the unicellular green alga Chlorella fusca Shihira et Krauss strain 211-8 b was described as a pH-, temperature-and energy-dependent process. Transport followed triphasic kinetics with /^-values of 1.3 x 10-5, 3.9 x 10-5 and 2.8 x 10 4 m. The Hill plot showed coeffi­ cients of 1.0 for each uptake isotherm. Sulfate uptake was substantially inhibited by chromate, selenate, sulfite, thiosulfate and tetrathionate. Cysteine and other mercaptides diminished sulfate transport, whereas methionine was not inhibitory. Uptake was sensitive towards inhibitors of photosynthesis and respiration and towards SH-group reagents. Sulfate uptake could be strongly enhanced by polyvalent cations, apparently via reduction of the surface potential. Sulfate uptake in S-deprived algae was markedly different from constitutive sulfate uptake. Time kinetics was not linear but showed an initial rapid phase. Uptake was neither multiphasic nor conformed to simple Michaelis-Menten kinetics. Sulfate uptake was hardly affected by pH and temperature in the suboptimal range. The Arrhenius plot was biphasic with a discontinuity at 38 °C. 
  Reference    Z. Naturforsch. 44c, 495 (1989); received December 30 1988 D edicated to 
  Published    1989 
  Keywords    Cation Stimulation, Chlorella fusca, Green Alga, Multiphasic Uptake, Sulfate Analogues, Sulfate Starvation 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0495.pdf 
 Identifier    ZNC-1989-44c-0495 
 Volume    44