| | 1 | Author
| Günter Döhler, Joachim Zink | Requires 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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| default:Reihe_C/40/ZNC-1985-40c-0527.pdf | | | | Identifier
| ZNC-1985-40c-0527 | | | | Volume
| 40 | |
| 2 | Author
| Günter Döhler | Requires 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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| default:Reihe_C/36/ZNC-1981-36c-0093.pdf | | | | Identifier
| ZNC-1981-36c-0093 | | | | Volume
| 36 | |
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