Pathogenic Germs Research Articles

PURE CULTURES.

By a pure culture is generally understood one which contains but one form of life, a single definite microörganism. This use of the term "pure culture" is justifiable so long as the use which is made of the culture is only morphological. Pure cultures of this type answer all requirements for the classification of microörganisms, for their morphological study. They might with propriety be termed "morphologically pure cultures." The absence of the limiting word, however, has lead to an improper idea of the purity of these cultures, and to a use of them for chemical purposes that is not strictly justifiable. Since the time whenBriegersewed such morphologically pure cultures in various media, and extracted therefrom the ptomaines formed, it has become customary to form similar cultures with pathogenic germs and to extract from them the poisons formed, so far, ptomaines or alkaloids,and toxalbumins, and to attribute the poisons

Gastric Juice and Pathogenic Germs

Gastric Juice and Pathogenic Germs

THE VIABILITY OF PATHOGENIC MICROBES AND THE LAKE VIEW EPIDEMIC.

<i>Pari passu</i>with the separation, and discovery of new bacilli, knowledge of their method of development, their habitat and peculiarities accumulates.StrausandDubarryhave in corroboration of the experiments ofBolton, WolffhügelandRiedel, come to certain definite conclusions regarding the viability of certain now well-known pathogenic germs. They have found the bacillus anthracis alive in water after the 16th, 24th, 28th, 65th and even as late as the 131st day. The bacillus of typhoid fever lives from 30 to 81 days. They found the bacillus of Asiatic cholera alive at 16, 26, 30 and 39 days—but it should be remembered thatWolffhügelandRiedelfound this microbe alive in river water after 7 months. The bacillus of tuberculosis was found living at 24, 25, 27, 30, 75, and 115 days, but it was also demonstrated that the virulence of this bacillus became attenuated after a long sojourn in