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1985 (1)
1979 (2)
1Author    GeorgH. Schmid, Pierre ThibaultRequires cookie*
 Title    Evidence for a Rapid Oxygen-Uptake in Tobacco Chloroplasts  
 Abstract    A fast oxygen uptake, induced by a sequence of short (5 /usee) saturating flashes was observed in chloroplasts of wild type tobacco and two chlorophyll-deficient tobacco mutants. One of the chlorophyll mutants is the earlier described variegated tobacco NC 95. Chloroplasts of this mutant exhibit only photosystem I mediated photoreactions, hence the observed oxygen uptake is to be associated with photosystem I. This is further substantiated by the fact that the oxygen uptake is insensitive to DCMU in the two chloroplast types used, which have both photosystems fully func­ tioning. The uptake depends on the addition of electron acceptors like p-benzoquinone in intact chloroplasts or on p-benzoquinone or ferricyanide in chloroplasts that have lost the envelope. In dark adapted chloroplasts, therefore, under these conditions the overall apparent gas exchange in the first two flashes is consumption. Although the uptake is slower than photosynthetic oxygen evolution it clearly affects the oxygen yield in the flash sequences. This is demonstrated by several experiments in which the apparent oxygen consumption in the absence of DCMU oscillates with a periodicity of four. We have indications that in chloroplasts of the tobacco aurea mutant Su/su the oxygen uptake is faster than in wild type chloroplasts. 
  Reference    Z. Naturforsch. 34c, 414 (1979); received February 14 1979 
  Published    1979 
  Keywords    Chloroplasts, Oxygen uptake, Oscillations, Photosynthesis 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0414.pdf 
 Identifier    ZNC-1979-34c-0414 
 Volume    34 
2Author    GeorgH. Schmid, Pierre ThibaultRequires cookie*
 Title    Characterization of a Light-Induced Oxygen-Uptake in Tobacco Protoplasts  
 Abstract    Protoplasts prepared from the wild type tobacco N. tabacum var. John W illiam 's Broadleaf ex­ hibit photosynthetic oxygen-evolution if the suspension medium is supplemented with bicarbonate. In the absence of bicarbonate no steady state oxygen-evolution is observed with such prepara­ tions. Instead, an appreciable uptake which is mainly insensitive to D C M U and which persists over hours, and therefore is no mduction phenomenon, is seen. Protoplasts of the tobacco aurea mutant Su/su, which is a plant with an exceptionally high photorespiration, show an oxygen con­ 
  Reference    Z. Naturforsch. 34c, 570—575 (1979); received April 2 1979 
  Published    1979 
  Keywords    Protoplasts, Oxygen-Uptake, Photorespiration, Action Spectrum 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0570.pdf 
 Identifier    ZNC-1979-34c-0570 
 Volume    34 
3Author    EugeneL. Barsky, FainaD. Kamilova, VitalyD. Samuilov, IcrobiologyRequires cookie*
 Title    Do Cyanobacteria Contain a Membrane Bound Cysteine Oxidase? Department o f Cell Physiology and Im m unology* and Department o f M  
 Abstract    The oxidation o f cysteine with 0 2 is facilitated by isolated membranes o f the cyanobacteria A nacystis nidulans and Anabaena variabilis, and further stimulated by Fe3+. This reaction accelerates with increasing the pH value and is suppressed by cyanide, benzylhydroxamate, hydroxylamine, but not azide. The agents m entioned inhibited the respiration o f the m embranes with ascorbate and N ,N ,N',N'-tetram ethyl-p-phenylenediam ine (TM PD) effectively, but did not influence their nonenzym ic oxidation. It is inferred that ascorbate in com bination with TM PD is oxidized via membrane oxidases. Cysteine oxidation apparently proceeds non-enzym atically and is catalyzed by the cations o f heavy metals. 
  Reference    Z. Naturforsch. 40c, 176 (1985); received October 2/D ecem ber 18 1984 
  Published    1985 
  Keywords    Cysteine Oxidation, Oxygen Uptake, Heavy Metal Cations, Membranes, Cyanobacteria 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0176.pdf 
 Identifier    ZNC-1985-40c-0176 
 Volume    40