It seems probable from the localized occurrence of bacillary hemoglobinuria in cattle that Clostridium hemolyticum is not widely distributed in the soil but is confined to rather restricted areas. The work of Safford and Smith (1954), who investigated the spread of this disease in Montana, indicated that this organism was not originally present but was introduced from another region. The carria...

Interactions between adhesion molecules, agglutinins, on the surfaces of the flagella of mt+ and mt- gametes in Chlamydomonas rapidly generate a sexual signal, mediated by cAMP, that prepares the cells for fusion to form a zygote. The mechanism that couples agglutinin interactions to increased cellular levels of cAMP is unknown. In previous studies on the adenylyl cyclase in flagella of a singl...

A STUDY OF INFLUENZA VIRUS INFECTION IN THE HAMSTER HAS YIELDED THE FOLLOWING RESULTS: 1. Two influenza A strains (Ga. 47 and PR8) multiplied readily in the hamster lung, although no lung lesions were produced during six serial passages. On further passage both viruses abruptly acquired the capacity to produce pulmonary consolidation and death of the animals. 2. Extracts of the lungs during the...