| | 2 | Author
| Peter Brandt, Helene Gleibs, Andrea Köhne, W. Olfgang, W. Iessner | Requires cookie* | | | Title
| Variabilität des "light-harvesting-systems" im Zellzyklus von Chlorella fusca Variability of the Light-Harvesting-System during the Cell Cycle of Chlorella fusca  | | | | Abstract
| The seven chlorophyll-protein com plexes CPIa, CPI, L H C P i, LHCP2, CPa, LHCP[ and LHCP]] known in part also from the chloroplasts o f higher plants were isolated from Chlorella fusca. They were characterized by their m olecular weight, their absorption m axim a and their ratio of chlorophyll a/chlorophyll b. The com position o f the chloropyhll-protein com plexes changes during the cell cycle o f Chlorella fusca. The ratio o f LH CP/C PI decreases at the beginning o f the light period and the ratio LH C P/C Pa after the 2nd hour o f the light period. Both quotients increase at the 5th hour o f the light period, have a m axim um at the 8th hour o f the light period and decrease afterwards during the second part o f the cell cycle. These altera tions are no reflections o f chlorophyll-accum ulation, but cause m odifications in the organization o f the thylakoids and influence the photosynthetic efficiency o f Chlorella fusca. The size o f the PSI-and PSII-units during the cell cycle was estim ated by these changes o f the LH C P/C PI-and LHCP/CPa-ratios. In addition evidence is given that the assem bly o f LHCP, and LHCP2 is no simple association o f the m onomeric forms o f LHCP] or LHCPu. | | | |
Reference
| Z. Naturforsch. 40c, 115 (1985); received August 22 1984 | | | |
Published
| 1985 | | | |
Keywords
| Thylakoid Differentiation, Chlorophyll-Protein C om plexes, Chlorella fusca, Photosystem | | | |
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| default:Reihe_C/40/ZNC-1985-40c-0115.pdf | | | | Identifier
| ZNC-1985-40c-0115 | | | | Volume
| 40 | |
| 3 | Author
| Berthold Scheffczyk, IngoD. Am, L.Horst Grimme | Requires 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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| default:Reihe_C/44/ZNC-1989-44c-0243.pdf | | | | Identifier
| ZNC-1989-44c-0243 | | | | Volume
| 44 | |
| 4 | Author
| Susanne Biedlingmaier, A.Hlert Schmidt | Requires 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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| default:Reihe_C/44/ZNC-1989-44c-0495.pdf | | | | Identifier
| ZNC-1989-44c-0495 | | | | Volume
| 44 | |
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