Abstract
It has been known from the former times that some kind of metal has had an evil effect upon the living condition of lower class of microbes. The present author and collaborators have made studies on methods and sensitive strains for this experiment as well as analyses of their functional factors, while they have proceeded with experiments on more or less different line from the hitherto. Results thus obtained are as belows.
Experimental methods and materials.
In the present experiment, the pure silver plate is mainly used, and two kinds of gram-positive bacilli and gram-positive cocci highly sensitive to the oligodynamic action are separated from the oral cavity. On the other hand, two methods are used for experiment. The one involves plate culture medium, on the surface, and in the depth of which metals are placed. By the other method liquid culture medium is used, and strains and metals put into the medium are measured by the resultant turbidity.
Conclusion
It is concluded from researches on factors of the metallic oligodynamie that those factors are attributable to the action of metallic ion ensuing from free dissolution of fusible metrllic salt formed on the surface of metal.
