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- W2473181450 abstract "(With 2 Figures in the Text) A faecal type of streptococcus and its variants, a salivary type, and a few haemolytic streptococci of groups B, C, F and G, are normal inhabitants of the faeces of man and other animals. Dible (1921) gave the specific name of Enterococc?bs or Streptococcus faecalts to that group of streptococci found in the faeces which was heat-resistant, did not liquefy gelatin, and was able to ferment mannite, but not raffinose or inulin. Several other streptococci, including Str. Iiq¢efaciens (Orla-Jensen, 1919), Str. zymogenes (MacCallum & Hastings, 1899), and Str. durans (Sherman & Wing, 1937) have been found to possess an antigen and certain other properties in common with enterococci and are now usually regarded as varieties of these organisms. Among the more important characteristics of the group are the ability to grow in the temperature range of 10-45° C., in broth containing as much as 6*5 °/O sodium chloride, and in broth as alkaline as pH 9@6. Observations by a number of workers in different fields (cf. Savage & Read, 1916; Houston, 1910, 1931, 1932; Ostrolenk, Kramer & Cleverdon, 1947; Ritter & Treece, 1948; Ingram, 1952; Allen, Grindley & Brooks, 1953) support the view that counts of Bactertu,rn coli and Str. faecatts together probably constitute a better index of faecal pollution than examination for either organism alone. The fact that Str. faecalis has been used much less than Bact. colt as an indicator of faecal pollution has been due largely to the lack of suitable methods for detecting and enumerating it. The tendency of sodium azide to block the assimilatory process more readily in Gram-negative than in Gram-positive bacteria was taken advantage of by Snyder & Lichstein (1940), who tested the use of this substance in a selective medium. They found that a concentration of 0e01 °/O allowed growth of Proteus species, of Bact. coli, and of streptococci, but that at a concentration of 0 05 °/O growth of the Gram-negative organisms was inhibited while Str. faecalis, Str. virtdans, and some haemolytic streptococci were able to grow." @default.
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- W2473181450 date "2016-01-01" @default.
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- W2473181450 title "ENUMERATION OF STREPTOCOCCUS FAECALIS, Wl'l' PARTICULAR REFERENCE TO POLLU'1'ED WATERS" @default.
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