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1989 (1)
1979 (1)
1Author    G. Kliinger, E. BrodaRequires cookie*
 Title    Der Einfluß zweiwertiger Fremdkationen auf die Aufnahme von Zink durch Chlorella Influence o f Twovalent Foreign Cations on the Uptake of Zinc by Chlorella  
 Abstract    The influence o f 10-4 divalent cations on the uptake o f labelled Zn in the concentration range 10~5 to 5 x 10-5 M into the interior o f Chlorella fusca at 30 °C was measured during 75 min. The Zn adsorbed on the surface or contained in the free space was rem oved by washing with EDTA. Corrections were applied for the loss in concentration due to surface adsorption, etc. The results were consistent with com petitive inhibition o f Zn uptake by the foreign ions. N o allosteric inh ib i­ tion was found. From the Lineweaver-Burk diagram, for uninhibited Zn, Ä^M was found as 7 x 1 0 "® M and vmax as 8.3 x lO -9 mol • m in_1-g -1 algae. The inhibitor constants were: Mg 1.3 xlO -5, Ca 4.3 x 10~5, Co 4.3 x 10-5, N i 4.3 x 10~5, Cd 1.3 x 10~5 and Pb 9.4 x 10~7 m. The values given for K m and the inhibitor constant refer to the velocities o f uptake after 45 min. 
  Reference    Z. Naturforsch. 34c, 751—756 (1979); eingegangen am 15. Juni 1979 
  Published    1979 
  Keywords    Chlorella, Green A lgae, Zn M etabolism, Ion Transport, Ion Com petition 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0751.pdf 
 Identifier    ZNC-1979-34c-0751 
 Volume    34 
2Author    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