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Most bacteria contain a peptidoglycan (PG) cell wall, which is critical for maintenance of shape and important for cell division. In contrast, Planctomycetes have been proposed to produce a proteinaceous cell wall devoid of PG. The apparent absence of PG has been used as an argument for the putative planctomycetal ancestry of all bacterial lineages. Here we(More)
Blue-pigmented exudates arise as droplets on sporulated lawns of Streptomyces coelicolor M110 grown on agar plates. Our electron microscopical and biochemical studies suggest that droplets contain densely packed vesicles with large assemblies of different protein types and/or the polyketide antibiotic actinorhodin. Frozen-hydrated vesicles were unilamellar(More)
Bactofilins are novel cytoskeleton proteins that are widespread in Gram-negative bacteria. Myxococcus xanthus, an important predatory soil bacterium, possesses four bactofilins of which one, BacM (Mxan_7475) plays an important role in cell shape maintenance. Electron and fluorescence light microscopy, as well as studies using over-expressed, purified BacM,(More)
BACKGROUND AND STUDY AIMS The goal of this study was to analyze the bowel cleansing methods currently used for pediatric colonoscopy in terms of effectiveness, tolerance and safety. PATIENTS AND METHODS Data from 768 colonoscopies reported by 28 centers were registered in an online database for further analysis. Binary logistic regression was used to(More)
Most halophilic Archaea of the class Halobacteriaceae depend on the presence of several molar sodium chloride for growth and cell integrity. This poses problems for structural studies, particularly for electron microscopy, where the high salt concentration results in diminished contrast. Since cryo-electron microscopy of intact cells provides new insights(More)
ó Rhizobien – " in Wurzeln Lebende " – sind symbiotische Bakterien der meisten Hülsen-früchtler (Leguminosen), wie Klee, Lupine, Bohne, Erbse und Linse. Viele Rhizobien regen die Bildung von Wurzelknöllchen an (Abb. 1). In ihnen wandeln sie Luftstickstoff (N 2) in Ammonium (NH 4 +) um und beliefern den Stoffwechsel der Pflanze, die nun nicht mehr auf(More)
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