EscherichiaLatinScientific name (Escherichia Castellani and Chalmers, 1919) straight rod, 1.1 ～ 1.5 μ m × 2.0 ～ 6.0 μ m, single or in pairs.Many strains have capsule and microcapsule.gram-negative.Movement with or without peripheral flagellamotion。Facultative anaerobic, with two metabolic types of respiration and fermentation.This description is still limited toEscherichia coli(E.coli）, becausecockroachEscherichia coli (E.blattae) has not been well studied, and there are only a few strains.The optimum temperature is 37 ℃.
EscherichiaLatinScientific name (Escherichia Castellani and Chalmers, 1919) straight rod, 1.1 ～ 1.5 μ m × 2.0 ～ 6.0 μ m, single or in pairs.Many strains have capsule and microcapsule.gram-negative.Movement with or without peripheral flagellamotion。Facultative anaerobic, with two metabolic types of respiration and fermentation.[1]
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This description is still limited toEscherichia coli(E.coli）, becausecockroachEscherichia coli (E.blattae) has not been well studied, and there are only a few strains.The optimum temperature is 37 ℃.[1]
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The colony on the nutrient agar may be smooth (S), low convex, wet, gray, shiny, full edgenormal salineMedium and easy to disperse;The colony may also be rough (R), dry, and difficult to disperse in physiological saline.There is an intermediate type between the two extreme types.Non stick and mucilage producing types also occur.Chemical energy and organic nutrition.oxidaseNegative, acetate can be used as the only carbon source, but citrate cannot be used.Fermentation of glucose and other sugars to produce pyruvate, which is further converted intolactic acid、acetic acidandformic acid, formic acid part can beFormate dehydrogenaseIt is decomposed into equal amounts of CO2 and H2.Some strains are anaerobic, and most strains ferment lactose, but they can also be delayed or notfermentation。It appears in the lower part of the intestines of warm blooded animals and cockroaches.The G+C mol% of DNA is 48 ～ 52 (Tm).[1]
