| | 2 | Author
| C. J. Soeder, E. Hegewald, E. Fiolitakis, J.U G Robbelaar | Requires cookie* | | | Title
| Temperature Dependence of Population Growth in a Green Microalga: Thermodynamic Characteristics of Growth Intensity and the Influence of Cell Concentration  | | | | Abstract
| Growth intensity o f the green alga, Scenedesmus obliquus, was measured in autotrophic cultures, diluted once daily, between 20 and 30 °C in a light-dark cycle o f 16 : 8 h at initial optical densities between 0.02 and 1.2. Arrhenius analyses o f the results showed linear relationships be tween growth intensity and temperature below the temperature optimum. The temperature effects on growth, activation energy, deactivation energy and normalized Q i0 values were signifi cantly influenced by the amount o f available light energy per unit biomass. The temperature dependence o f nutrient-lim ited growth was not considered. | | | |
Reference
| Z. Naturforsch. 40c, 227—233 (1985); received Decem ber 5 1984 | | | |
Published
| 1985 | | | |
Keywords
| M icroalgae, Growth, Temperature, Light, Thermodynamics | | | |
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| default:Reihe_C/40/ZNC-1985-40c-0227.pdf | | | | Identifier
| ZNC-1985-40c-0227 | | | | Volume
| 40 | |
| 3 | Author
| Hartwig Schulz, Gabriele Lausch, Walter Feldheim | Requires cookie* | | | Title
| Veränderung des Tocochromanolmusters einiger Pflanzenöle (Sojabohne, Lupine, Sonnenblume und Weizen) während Keimung und Wachstum Alteration of Tocochromanol Pattern in Some Plant Oils (Soybean. Lupine. Sunflower and Wheat) during Germination and Growth | | | | Abstract
| Seed, sprout and plant oils from soybean (Soja hispida), lupine (Lupinus mutabilis), sunflower (Helianthus annuus) and wheat (Triticum aestivum) were assayed for their tocochromanol content and composition. High-performance liquid chromatography (HPLC) with fluorescence detection was used to determine tocopherols and tocotrienols of laboratory-extracted oils. In general, leaves of lupine, soja, and wheat with a high chlorophyll-a-content also were found to be rich of alpha-tocopherol; roots contained very little or no tocopherol. Contents of gamma-and delta-tocopherol in soja and lupine decreased during germination and growth, whereas the alpha-tocopherol concentration increases significantly. This evidence suggests that non-alpha-to-copherols might be methylated enzymatically to alpha-tocopherol. Tocochromanol pattern of wheat also changes characteristically in an analogous manner during plant development. Germ i nation of sunflower seeds also resulted in a conversion of beta-and gamma-tocopherols and in a slight decrease of the predominantly occurring alpha-tocopherol. In relation to the lipid content, the concentration of total tocopherols in oil plants increases significantly during growth. Possible implications for the biosynthesis of tocochromanols are discussed. | | | |
Reference
| Z. Naturforsch. 40c, 760—766 (1985); received September 6. 1985 | | | |
Published
| 1985 | | | |
Keywords
| Tocochromanols, Plant Oils Chlorophyll, Germination, Growth | | | |
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| default:Reihe_C/40/ZNC-1985-40c-0760.pdf | | | | Identifier
| ZNC-1985-40c-0760 | | | | Volume
| 40 | |
| 4 | Author
| Christian Wilhelm, Aloysius Wild | Requires cookie* | | | Title
| Growth and Photosynthesis of Nanochlorum eucaryotum, a New and Extremely Small Eucaryotic Green Alga | | | | Abstract
| Nanochlorum eucaryotum is a very small species o f unicellular coccoid green algae (1.5 nm). The growth of Nanochlorum under different conditions o f salinity, pH and light intensities was studied. Optimal growth rates were observed with normal sea water salinity and low light conditions at pH 7.0. The contents o f chlorophylls, carotinoids, soluble proteins and the chlorophyll a to chlorophyll b ratio were measured. The light saturating curves of Nanochlorum cells grown under light intensities o f 100 lx, 2000 lx and 10000 lx reveal a very narrow capacity of light adaptation. When cultured under higher light intensities, Nanochlorum was not able to reach high photosynthetic activities but underwent a photoinhibition o f photosynthesis. The contents of cytochrome f, P-700 and ribulosebisphosphate carboxylase were low and comparable with those of low light adapted Chlorella cells. The analysis o f the chlorophyll-protein complexes shows that about 80% o f total chlorophyll is bound in the light harvesting chlorophyll protein complexes. All results indicate that Nanochlorum is a low light adapted marine organism with very narrow ecological flexibility. | | | |
Reference
| Z. Naturforsch. 37c, 115—119 (1982); received October 191981 | | | |
Published
| 1982 | | | |
Keywords
| Nanochlorum eucaryotum, Growth, Photosynthesis, Cytochrome f, Chlorophyll-Protein Complexes | | | |
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| default:Reihe_C/37/ZNC-1982-37c-0115.pdf | | | | Identifier
| ZNC-1982-37c-0115 | | | | Volume
| 37 | |
| 5 | Author
| Hans Eckstein | Requires cookie* | | | Title
| Evidence for Cyclic GMP in the Yeast Saccharomyces cerevisiae, and Studies on Its Possible Role in Growth | | | | Abstract
| The yeast Saccharomyces cerevisiae is shown to be equipped with cyclic GMP, the level of which ranges from 6 pmol/10 9 cells with pressed baker's yeast to 21 pmol/10 9 cells with exponentially growing cells. In extracts from synchronized growing yeast, cyclic GMP increases stepwise, being doubled at the time of each mitosis. Theophylline and 3-isobutyl-l-methylxanthine induce a rapid increase of cyclic GMP, followed by a premature formation of the septal cell wall between mother cell and bud. The effects of 3-isobutyl-l-methylxanthine are reversible. Dibutyryl-cyclic GMP, and, after a pronounced lag, also dibutyryl-cyclic AMP, induce a premature cell division, too. Cholera toxin induces premature cell divisions without a preceding increase in cyclic GMP. Neither theophylline nor 3-isobutyl-l-methylxanthine, cholera toxin or one of the dibutyryl-cyclic nucleotides modify the growth rate of the culture. None of the agents has significant effects on the level of cyclic AMP. The results suggest that cyclic GMP possibly controls an early step of mitosis, whereas ADP-ribosylation might govern a subsequent event. | | | |
Reference
| Z. Naturforsch. 43c, 386—396 (1988); received October 20 1987 | | | |
Published
| 1988 | | | |
Keywords
| Cyclic GMP, Cyclic AMP, Phosphodiesterase Inhibitors, Cholera Toxin, Growth, Yeast | | | |
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| default:Reihe_C/43/ZNC-1988-43c-0386.pdf | | | | Identifier
| ZNC-1988-43c-0386 | | | | Volume
| 43 | |
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