A manual of hygiene and sanitation . steam sterilizer, pattern of Koch. As a basis for a number of culture-media we may usebeef-broth or bouillon, which is a fluid especially favor-able to bacterial growth in that it contains an abundanceof albumin in solution. When a solid medium is desired,either gelatin or agar-agar (a gelatin-like substance ob-tained from Japan) may be added to bouillon, givingnutrient gelatin and nutrient agar-agar. Of these, the DIFFERENTIATION OF SPECIES. 45 gelatin has a melting-point below the temperature of thehuman body, while that of agar is above ; consequently we
A manual of hygiene and sanitation . steam sterilizer, pattern of Koch. As a basis for a number of culture-media we may usebeef-broth or bouillon, which is a fluid especially favor-able to bacterial growth in that it contains an abundanceof albumin in solution. When a solid medium is desired,either gelatin or agar-agar (a gelatin-like substance ob-tained from Japan) may be added to bouillon, givingnutrient gelatin and nutrient agar-agar. Of these, the DIFFERENTIATION OF SPECIES. 45 gelatin has a melting-point below the temperature of thehuman body, while that of agar is above ; consequently weemploy the latter when it is desired to cultivate germs thatgrow best at the body temperature, although the develop-ment of most bacteria is usually more rapid and charac-teristic upon gelatin. Blood-serum sterilized and solidi-fied is also used for the cultivation of certain organisms, Fig. 7.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, bookyear1903
