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'14C 0 2 Fixation' in keywords Facet   section ZfN Section C  [X]
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1985 (1)
1981 (1)
1Author    Günter Döhler, Joachim ZinkRequires cookie*
 Title    and Amino Acid Pools of Bellerochea yucatanensis (v. Stosch) and Thalassiosira rotula (Meunier)  
 Abstract    The marine diatoms Bellerochea yucatanensis and Thalassiosira rotula were grown at different salinities (20/25, 35, and 40/45%o salinity (S), respectively) under normal air (0.035 vol.% C 0 2). No significant variations in the percentage of gross photosynthetic products (e.g. total amino acids, sugar phosphates) were found as a function of salinity during growth. The bulk of the soluble 14C-radioactivity was detected in amino acids. 14C-labelling of glutamine increased mark­ edly with salinity. Low salt — grown algae are characterized by enhanced amino acid pools, mainly of aspartic acid, asparagine and glutamine. It was found that the tested amino acids are not involved in osmoregulation. 
  Reference    Z. Naturforsch. 40c, 527—530 (1985); received March 16/April 24 1985 
  Published    1985 
  Keywords    14C 0 2 Fixation, Amino Acid Pools, Salinity, Marine Diatoms 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0527.pdf 
 Identifier    ZNC-1985-40c-0527 
 Volume    40 
2Author    Günter DöhlerRequires cookie*
 Title    Einfluß von Sauerstoff auf die photosynthetische C 0 2-Fixierung von Synechococcus Effect of Oxygen on Photosynthetic C 0 2 Fixation of Synechococcus  
 Abstract    The cyanobacterium Synechococcus (Anacystis nidulans strain L 1402-1) was grown at +35 °C in air and in air enriched with 2.2 vol.% C 0 2. The effect o f different oxygen concentrations (0, 2, 20, 50, 75 and 99.97 or 97.8 vol.%) was studied in low (0.03 vol.%) and high (2.2 vol.%) C 0 2 concentrations at + 35 °C. After exposure to a nitrogen atmosphere and low C 0 2 content I4C-bicarbonate was mainly incorporated into aspartate and glycine/serine. During oxygenic photosynthetic C 0 2 fixation label in aspartate decreased and a high degree o f radioactivity could be found in 3-phosphoglyceric acid and sugar monophosphates. The Calvin cycle was the main fixing pathway in 2.2 vol.% C 0 2 during anoxygenic and oxygenic conditions independent on the 0 2 concentrations during the experiments. N o oxygen enhancement o f photosynthetic C 0 2 fixation could be found. Possible mechanism involved in C 0 2 fixation pathways and glycolate metabolism underlying the effect o f oxygen was discussed. 
  Reference    Z. Naturforsch. 36c, 93—9 (1981); eingegangen am 9. Oktober 1980 
  Published    1981 
  Keywords    14C 0 2 Fixation, Effect of Oxygen and C 0 2 Concentrations, Synechococcus 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0093.pdf 
 Identifier    ZNC-1981-36c-0093 
 Volume    36