Carl J. Soeder

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The influence of two phytogenic surfactants on the elimination of polycyclic aromatic hydrocarbons (PAH) was studied in shaken-batch cultures of three soil bacteria under axenic conditions. At sufficiently high concentrations, quillaya saponin and soybean lecithin solubilized phenanthrene or fluoranthene efficiently. However, complete solubilization of the(More)
This study provides preliminary evidence that NO production could be a general attribute of algae. Anabaena doliolum was found to be a better NO producer than Scenedesmus and Synechoccocus. Experiments conducted with inhibitors of photosynthesis (DCMU), ATP synthesis (DCCD), and the uncoupler (2,4-DNP) and its analog arsenate clearly revealed that(More)
The dependence of growth on nickel supply was studied in Chlorella emersonii 211-8b. After transfer to Ni2+ deficient medium containing only 0.5±0.2 μg/l of Ni2+, production of biomass or daughter cells dropped to 55±5% of the controls, and the cells became chlorotic. These symptoms of deficiency disappeared completely by supplying adequate amounts of(More)
1. Die periodischen Schwankungen der respiratorischen Aktivität synchroner Populationen von Chlorella fusca (Stamm 211-8b der Göttinger Sammlung von Algenreinkulturen) sind nicht unmittelbar vom Licht-Dunkel-Wechsel (16 : 8 Std) abhängig. a) Wird die Generationsdauer bei unverändertem Licht-Dunkel-Wechsel von 24 Std auf 48 Std verlängert, so tritt das(More)
Under sulfate limitation, axenic batch cultures of the green alga Scenedesmus obliquus metabolized 1-naphthalenesulfonic acid and partially used the sulfonate as a source of sulfur. The main metabolite, 1-hydroxy-2-naphthalenesulfonic acid, which was not metabolized further in the algal culture, was formed by hydroxylation of the substrate in position 1 and(More)
A concentration-dependent toxicity of hydrogen peroxide (H(2)O(2)) was observed on growth yield, chlorophyll a content and chlorophyll fluorescence characteristics of the green microalga Scenedesmus obliquus under laboratory batch culture conditions. The addition of sodium nitroprusside, a nitric oxide (NO) donor, in combination with H(2)O(2) prevented(More)
1-Naphthalenesulfonate (1-NS) was utilized by axenic cultures of Scenedesmus obliquus and by 5 other green microalgae as the sole source of sulfur. For all algae under study, 2-naphthalenesulfonate was definitely inferior to 1-NS as a source of sulfur. The rate of disapperance of 1-NS from the medium was measured by HPLC and, indirectly, by relating growth(More)