This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... but obscures the sanitary results by reason of the presence of soil bacteria." Muir and Ritchie state that the count on gelatin plates incubated at 20 C. gives an idea of the number of bacteria which grow ot summer heat and that the count on agar plates " incubated at 37 C. gives an idea of the number of those which ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... but obscures the sanitary results by reason of the presence of soil bacteria." Muir and Ritchie state that the count on gelatin plates incubated at 20 C. gives an idea of the number of bacteria which grow ot summer heat and that the count on agar plates " incubated at 37 C. gives an idea of the number of those which grow at blood heat." The following comments are added: "As the pathogenic and intestinal bacteria grow at this temperature (37 C), the determination of the numbers of blood-heat bacteria is important. The counts on the two media usually differ as each is favorable to the growth of its own group of organisms." The same authors note that the presence of liquefying bacteria on the gelatin plates may make it necessary to count the plates at the end of twentyfour hours, or at the end of a shorter time than is directed in the commonly accepted procedure. Most bacteriologists apparently believe that the agar count at 37 C. indicates more nearly the bacteria of sewage origin and that it consequently is more important in ascertaining the potability of water. The results of Savage's experiment show, however, that erroneous conclusions will be drawn if the count at that temperature is considered to furnish indication of possible sewage pollution, because soil may contribute large numbers of harmless bacteria that grow at 37 C. The advantages and disadvantages of each medium are well known to all bacteriologists. Agar is better for field work in warm weather because it can be transported with less trouble either in test tubes or in Petri dishes; great care must be used to prevent liquefaction if gelatin is used. As gelatin has to be shipped in cooled containers in warm weather it can seldom be used in the field. A less elaborate in...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
