Improving the photosynthetic H2-productivity of the green alga Chlorella fusca by physiologically directed O2 avoidance and ammonium stimulation

1986 ◽  
Vol 144 (1) ◽  
pp. 25-28 ◽  
Author(s):  
Bernd Mahro ◽  
L. Horst Grimme
Keyword(s):  
Green Alga ◽  
Chlorella Fusca ◽  
Green Alga Chlorella ◽  
Ammonium Stimulation

The Inhibition of Carotenoid Biosynthesis in Green Algae by SANDOZ H 6706: Accumulation of Phytoene and Phytofluene in Chlorella fusca

1975 ◽  
Vol 30 (5-6) ◽  
pp. 333-336 ◽  
Author(s):  
H. W. Kümmel ◽  
L. H. Grimme
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
Control Mechanism ◽  
Carotenoid Biosynthesis ◽  
Chlorella Fusca ◽  
Prolonged Cultivation ◽  
Green Alga Chlorella

Abstract Prolonged cultivation of the green alga Chlorella fusca under heterotrophic conditions and in the presence of sub-lethal concentrations of SAN H 6706 (4-chloro-5-(dimethylamino)-2-(α,α,α-tri-fluoro-m-tolyl)-3 (2H)-pyridazinone) leads to an accumulation of phytoene and phytofluene. The content of chlorophylls and coloured carotenoids of the cells treated with this herbicide, compared with normal untreated cells, is diminished by about 90% and 95% respectively, but the total amount of carotenoids, including colourless phytoene and phytofluene, is increased by 65%. This suggests that SAN H 6706 causes increased accumulation of carotenoids by eliminating a biosynthetic control mechanism, so that the endproducts of the biosynthetic chain no longer control the rate of precursor formation.

PS IIα/ß Heterogeneity during the Cell Cycle of the Unicellular Green Alga Chlorella fusca

1989 ◽  
Vol 44 (3-4) ◽  
pp. 243-248 ◽  
Author(s):  
Berthold Scheffczyk ◽  
Ingo Damm ◽  
L. Horst Grimme
Keyword(s):  
Cell Cycle ◽  
Green Alga ◽  
Rate Constant ◽  
Quantitative Relationship ◽  
Fluorescence Induction ◽  
Chlorella Fusca ◽  
Ps Ii ◽  
Antenna Size ◽  
Unicellular Green Alga ◽  
Green Alga Chlorella

Abstract Fluorescence induction m easurem ents indicate a PS IIα,β heterogeneity in the unicellular green alga Chlorella fusca. Under normal light the relative amount of PSα II is decreasing from 63% to 43% during the first 8 h of the cell cycle. The rate constant kα shows a concomitant decrease by 20% in the first 4 h. The relative amount and antenna size of PS IIα is restored in the dark. In contrast, PS IIβ - centres show the same rate constant during the whole cell cycle. Under low light kα is increased by approximately 30% over the cell cycle, whereas no change of kβ 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 complex regulation (i) involving the antenna size of α-centres and (ii) changing the quantitative relationship of fast and slow reaction centres.

The cytoplasmic pH in photosynthesizing cells of the green alga Chlorella fusca, measured by P-31 NMR spectroscopy

1987 ◽  
Vol 147 (1) ◽  
pp. 25-29 ◽  
Author(s):  
J. Sianoudis ◽  
A. C. K�sel ◽  
A. Mayer ◽  
L. H. Grimme ◽  
D. Leibfritz
Keyword(s):  
Nmr Spectroscopy ◽  
Green Alga ◽  
Cytoplasmic Ph ◽  
Chlorella Fusca ◽  
Green Alga Chlorella
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