動物腸内に於ける好気性菌の生理的意義に関する実験的研究
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概要
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By using the white leghorn chicks whose bodies contain no germs at all, studies were performed to determine the effects of Staphylococcus, an aerobe usually found in the intestines of flocks in this country, on their growth and general conditions, as well as on the germicidal power of their serum. B. sporogenes and Escherichia coli were also given to germless chicks singly or in combination with Staphylococcus. These microbes were orally given to ten-day-old chicks which had been hatched and raised in the tankshaped chamber sterilized with steam. (1) There was no difference in the growth and general conditions between the chicks which had been given Staphylococcus and the chicks which remained germ-free throughout the experiments. A similar experiment conducted with chicks hatched and reared in a normal environment revealed that Staphylococcus likewise had no influence on their growth and general conditions. (2) Comparison of the chicks which had been given B. sporogenes alone with the chicks which had been given it in combination with Staphylococcus showed that there was almost no change in the growth and general conditions between the two groups, though they were inferior to germless chicks in growth and general conditions. The chicks which had been given B. sporogenes alone had relatively severe diarrhea. There was no difference in the number of organisms of B. sporogenes found in the feces between the chicks which had been given B. sporogenes alone and the chicks which had been given it in combination with Staphylococcus. (3) Administration of E. coli to germless chicks singly or in combination with Staphylococcus led to a temporary cessation of growth and worsening of general conditions. The chicks which had been given E. coli in combination with Staphylococcus restored normal pace of growth more rapidly and smoothly than the chicks which had been given E. coli alone. The serum of the former had a slightly higher germicidal power than that of the latter. A larger number of the organisms of E. coli was found in the feces of the latter than in the feces of the former. The results of the present experiments would indicate that, while Staphylococcus exerts no influence on the growth and general conditions of the animal by itself, it has a power of inhibiting the actions of E. coli and B. sporogenes which have been regarded as harmful microbes.
- 千葉大学の論文
- 1958-07-28
著者
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