enterococcus 3D 模型

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enterococcus is a genus of lactic acid bacteria of the phylum firmicutes. enterococci are gram-positive cocci that often occur in pairs diplococci or short chains and are difficult to distinguish from streptococci on physical characteristics alone. two species are common commensal organisms in the intestines of humans: e. faecalis 90-95% and e. faecium 5-10%. there are rare clusters of infections with other species including e. casseliflavus, e. raffinosus.
enterococci are facultative anaerobic organisms, i.e., they do not require oxygen for metabolism, but can survive in oxygen-rich environments. though they are not capable of forming spores, enterococci are tolerant of a wide range of environmental conditions: extreme temperature 10-45°c, ph 4.5-10.0 and high sodium chloride concentrations.
enterococci typically exhibit gamma-hemolysis on sheep's blood agar.