H. -D. Tauschel

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The characterization of two sub-groups of the species Rhodopseudomonas gelatinosa was continued. Differences in relation to generation time, slime production, tendency to conglomerate, utilization of substrates and the characteristics of the in vivo-absorption spectra are described. All strains liquefy gelatin and grow very well on aspartic acid as(More)
Rhodopseudomonas palustris, strain 11/1, loses its flagellum when the environment is changed, f.e. during low speed centrifugation. The flagella which are well preserved in their structure are found in the supernatant of such centrifugation. They can be purified by differential centrifugation. By treatment of the flagella with distilled water or by freezing(More)
Cytochrome oxidase activity has been demonstrated by electronmicroscopical cytochemical methods in swarm cells as well as in the sheathforming cells of Sphaerotilus natans. This enzyme is associated with the inside of the cytoplasmic membrane. The conditions for demonstrating this cytoplasmic membrane-associated cytochrome oxidase differ from those enabling(More)
The polar organelle, a structure associated with the flaggelar apparatus of bacteria, has been demonstrated in whole unstained cells of the photosynthetic bacterium Rhodopseudomonas palustris. It is subpolarly located close to the surface of the bacterial cell and has a round or ellipsoidal shap. It shows a strong ATPase activity which enables its(More)
The polar organelle of bacteria presumably is part of the flagellar apparatus. In order to characterize this structure, cytochemical studies on Sphaerotilus natans have been performed. Marked ATPase activity is associated with the inner boundary layer and central layer of this organelle. The spaces between the boundary layers and the central layer of the(More)
Previous studies showed that bile salts had apromoting effect on colon cancer development and thiseffect was inhibited by ursodeoxycholate (UDC). Werecently found that both human colorectal adenomas and carcinomas were associated with a specificdecrease in alkaline sphingomyelinase activity. In thiswork, we compared the effects of ursodeoxycholate andother(More)
Rhodopseudomonas palustris, strain 11/1 is able to grow aerobically in the dark and likewise anaerobically in the light. The biosynthesis of bacteriochlorophyll and the morphogenesis of the thylakoids (chromatophores) are light independent processes. They are induced by lowering the oxygen partial pressure in the culture from 100 to 5 mm Hg [pO2]. The(More)
Helical arranged ribosomes were detected in the polar region of Rhodopseudomonas palustris cells. They are attached to the cytoplasmic membrane. The columnar polysomes are shaped of two helical strings of ribosomes, which are arranged around the axis of the screw. The vertical projection of the single ribosomes in one turn of the screw is a hexagon. The(More)
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