大腸菌群測定法の水質汚染指標性の検討

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  • Evaluation of the standard total coli-form MPN test for the biological examination of water pollution
  • ダイチョウキングン ソクテイホウ ノ スイシツ オセン シヒョウセイ ノ ケン

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The standard total coli-form MPN test is widely used as a biological indicator of water pollution. But our applications of the test to various field works resulted in much higher cell numbers than be expected. The reason can be thought to be that bacteria belonging to coliform group do not always derived from human and animal feces.<br>In order to examine this possibility, the authors carried out the isolation and identification of bacteria which were detected by this method from various kinds of specimens. The result indicated that the bacteria designated as coli-form group included not only human- and animal-derived bacteria but also bacterial species which apparently derived from plants, soil or water, e.g. Erwinia, Aeromonas, Serratia, Citrobacter and so forth.<br>Therefore, a method is demanded by which one can estimate quantitatively only bacteria associated with human and animal feces.

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