THE GERMICIDAL ACTION OF SUNLIGHT UPON BACTERIAL SPORES

The Effect of Serum upon the Germicidal Action of Soaps

1. Far more information about the effect of serum or other substances upon the germicidal action of soaps can be obtained by determining the germicidal titers over a wide range of pH than by determining the titer at a single pH. In this way a characteristic curve for each test substance is obtained. 2. The curve for a particular concentration of serum bears a definite relationship to the curve ...

The Action of Sunlight upon Bacteria with Special Reference to B. tuberculosis.

The Germicidal Action of Α-mercapto and Α-disulfo Soaps

1. Certain of the alpha-mercapto soaps and alpha-disulfo soaps are powerful germicides. 2. In the alpha-mercapto series, those soaps with 12 and 14 carbon atoms are most germicidal. In the disulfo series, the dicaprate, dilaurate, and dimyristate are most germicidal. The optimum number of carbon atoms varies with the test organism used. 3. These soaps, like others previously studied, show a mar...

The Germicidal and Hemolytic Action of Α-brom Soaps

1. The soaps of the alpha-brom fatty acids are usually more germicidal than the unsubstituted soaps. Only when B. typhosus was the test organism was there no increase in germicidal action. 2. For any test organism, germicidal action of the brominated soaps increases rapidly with increasing molecular weight up to a certain point, then diminishes. This is likewise true of the hemolytic titer. The...

Germicidal Action of Daylight on Meningococci in the Dried State.

The study reported in the preceding communication (1943) showed that meningococci are much more resistant to dehydration than is generally supposed and that in films dried on glass, wood, or cotton fabric, they can survive for a week or more in the dark. The question of their susceptibility to the germicidal action of direct and diffuse sunlight seemed also to invitereexamination. The observati...