Among the most interesting problems in bacteriology are those that have to do with the mutual relations of the organisms under natura l conditions. Numerous notations of effects, both beneficial and detrimental, of on e organism upon another are to be found in bacteriological literature. The beneficial action on a specific organi s m of the associative growth of another organism is well illustr...

Succinic acid is a major end product of two cellulose-fermenting bacteria isolated in pure culture from the rumen of cattle and sheep. Ruminococcus flavefaciens, isolated by Sijpesteijn (1948, 1949, 1951), produced some 0-5 m-mole succinic acid per m-mole cellulose (calculated as glucose) fermented. Bacteroides succinogenes, isolated from the bovine rumen by Hungate (1950), was found by this au...

This study introduces the use of the filtration membrane technique and the enrichment method to detect and enumerate bifidobacteria from various animal species.

from [2-14C]mevalonic acid is labelled only in the methyl carbon shows that the reduction of the A24-double bond of desmosterol to form cholesterol, as well as the oxidation of the terminal carbon atom of the side chain of cholesterol, is stereospecific. If this were not the case, the C-26 and C-27 would become equivalent, and the [14C]propionic acid removed enzymically from the side chain woul...