| | 1 | Author
| Günter Döhler, Ralf Barckhausen, Manfred Ruppel | Requires cookie* | | | Title
| Ultrastructure of Differently Pigmented Synechococcus Cells  | | | | Abstract
| Synechococcus (.Anacystis nidulans, strain L 1402-1) were grown at + 37 °C in an atmosphere o f 0.04 vol.% C 0 2 using different light conditions. Changing the culture conditions caused alterations in pigment ratios and ultrastructure o f Synechococcus. In comparison to the low white and red light grown cells under strong white light the number o f thylakoids decreased and an accumulation of storage carbohydrates could be observed. The number o f the polyhedral bodies also varied with culture conditions. The results are discussed with reference to the pigment composition and the function of the polyhedral bodies. | | | |
Reference
| Z. Naturforsch. 36c, 907 (1981); received May 15 1981 | | | |
Published
| 1981 | | | |
Keywords
| Synechococcus, Ultrastructure, Polyhedral Bodies, Pigment Composition | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0907_n.pdf | | | | Identifier
| ZNC-1981-36c-0907_n | | | | Volume
| 36 | |
| 2 | Author
| Günter Datz, GünterD. Öhler | Requires cookie* | | | Title
| Light-Dependent Changes in the Lipid and Fatty Acid Composition of Phycocyanin-Free Photosynthetic Lamellae of Synechococcus | | | | Abstract
| The growth o f Synechococcus at different intensities o f white and red light caused changes in the pigment composition. The ratio of chlorophyll a to phycocyanin varied from 1:8,2 in LWLI-grown cells to 1:1,4 in cells grown at HW LI and to 1:15,7 in cultures exposed to HRLI. Acyl lipids were quantitatively determ ined and fatty acids o f the individual lipid classes analysed by GLC. Phycocyanin-free photosynthetic lam ellae were obtained by fractional centrifugation. No variation was found in the acyl lipid composition of the m em brane preparations. These all contained M G D G , D G D G , SQDG and PG as components. In all the lipids investigated, palmitic, hexadecenoic and octadecenoic acids m ade up to more than 90% of total fatty acids. The pattern Of these "m^jor components w ithin the lipids from the different cultures depended on the light used. N o large differences were detected between zones obtained from LWLI and HRLI isolated membranes, whereas density gradient centrifugation of those from HWLI-grown cells resulted in a completely different pattern o f bands. The variations in lipid and fatty acid composition are discussed with respect to changes observed in lipid composition of whole cells and the results reported on tem perature dependent shifts in lipid fluidity in cyanobacteria. | | | |
Reference
| Z. Naturforsch. 36c, 856—862 (1981); recieved May 25 1981 | | | |
Published
| 1981 | | | |
Keywords
| Pigmentation, Phycocyanin-Free Lamellae, Lipid and Fatty Acid Composition, Synechococcus | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0856.pdf | | | | Identifier
| ZNC-1981-36c-0856 | | | | Volume
| 36 | |
| 3 | 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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