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1Author    MatildeBarón Ayala, Gerhard SandmannRequires cookie*
 Title    The Role of Cu in Respiration of Pea Plants and Heterotrophically Growing Scenedesmus Cells  
 Abstract    In Scenedesmus about half of NADH oxidation proceeds via a cyanide-sensitive and the other half via a cyanide-insensitive respiratory pathway. In contrast, respiration is completely cyanide sensitive in pea indicating that the alternative respiratory pathway is absent. Cu deficiency in pea plants and in heterotrophically grown Scenedesmus cells interferes with respiratory activity of mitochondria. In both organisms, the cyanide-sensitive NADH oxidation was strongly decreased during cultivation in low Cu media. Cu sensitivity was also observed for the alternative respiratory pathway in Scenedesmus. These results suggest that a Cu-containing component is involved in the alternative respiratory pathway. This is the main reason why alternative respiration cannot be regarded as a compensation for low cytochrome-oxidase activities during Cu starvation. The Cu dependency of the cyanide-sensitive respiration was located at the site of cytochrome oxidase. A strong coordination of the biosynthesis of the Cu-containing cytochrome-oxidase complex was evident. When the endogenous Cu pool was low, formation of cytochrome aa 3 , another component of cytochrome oxidase, was also decreased. 
  Reference    Z. Naturforsch. 43c, 438—442 (1988); received December 7 1987/February 10 1988 
  Published    1988 
  Keywords    Cu Deficiency, Cytochrome Oxidase, Mitochondria, Pea Plants, Scenedesmus 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0438.pdf 
 Identifier    ZNC-1988-43c-0438 
 Volume    43 
2Author    Kiriakos Kotzabasis, Horst SengerRequires cookie*
 Title    Free, Conjugated and Bound Polyamines during the Ceil Cycle in Synchronized Cultures of Scenedesmus obliquus  
 Abstract    The levels of free, conjugated and bound polyamines (PA) were analyzed during the cell cycle of the synchronized unicellular green alga Scenedesmus obliquus. The polyamines putrescine (PUT) and spermidine (SPD) in their free and conjugated forms accumulated per cell to a maximum in the cell cycle at about the 16 th hour after onset of illumination. The polyamines bound to macromolecules and membrane systems showed an additional peak around the 8-10 th hour of the cell cycle. The possible role of the different forms of poly­ amines in DNA replication, mitosis, cell division and development of the photosynthetic apparatus is discussed. 
  Reference    Z. Naturforsch. 49c, 181—185 (1994); received December 31993 
  Published    1994 
  Keywords    Cell Cycle, Polyamines, Putrescine, Spermidine, Scenedesmus 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0181.pdf 
 Identifier    ZNC-1994-49c-0181 
 Volume    49 
3Author    Tetsuji Iida, Satoshi Senoo, Yukiharu Sato, Beate Nicolaus, Ko Wakabayashi, Peter BögerRequires cookie*
 Title    Isomerization and Peroxidizing Phytotoxicity of Thiadiazolidine-thione Compounds Synthesis of Thiadiazolidine-2-thiones Eight 5-arylim ino-3,4-tetram ethylene-l,3,4-thiadiazolidine-2-thiones and eight 4-ary l-l,2- tetram ethylene-l,2,4-triazolidine-3,5-dithiones were synthesized and their phytotoxic activi­  
  Reference    Z. Naturforsch. 50c, 186 (1995); received D ecem ber 5 1994 
  Published    1995 
  Keywords    Peroxidizing Herbicides, Glutathione 5-Transferase, Echinochloa, Scenedesmus 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0186.pdf 
 Identifier    ZNC-1995-50c-0186 
 Volume    50 
4Author    Alexander Pazur, Hugo ScheerRequires cookie*
 Title    The Growth of Freshwater Green Algae in Weak Alternating Magnetic Fields of 7.8 Hz Frequency  
 Abstract    Liquid cultures o f Chlorella kessleri, Scenedesmus armatus and Chlamydomonas reinhardtii have been grown phototrophically in weak (0 .2 -2 G) alternating (7.8 Hz) magnetic fields. The data indicate, that the rate o f cell division is larger at 0.2 than at 2 G, viz. that the higher fields have inhibitory effects on cell division and that there is possibly an optimum at = 1 G. N o reli­ able effect is found on the pigment contents. 
  Reference    Z. Naturforsch. 47c, 690—6 (1992); received April 13/July 7 1992 
  Published    1992 
  Keywords    Earth M agnetic Field, Schumann Resonance, Chlorella, Scenedesmus, Chlamydomonas, Chlorophyll 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0690.pdf 
 Identifier    ZNC-1992-47c-0690 
 Volume    47