Abstract: A new antibiotic (now called dihydromocimycin) being a yellow, salt-forming weak acid and its non-toxic, pharmaceutically acceptable salts produced by a novel microorganism called Streptomyces ramocissimus, a sample of which is deposited in the collection of "Centraal Bureau voor Schimmel-cultures" at Baarn, The Netherlands, under No. CBS 190.69, or mutants thereof, which antibiotic has antibacterial properties and has been found to be effective against Treponema dysentry, one of the most common swine diseases. Dihydromocimycin may also be converted into mocimycin which is an antibiotic which also possesses growth-promoting properties when added to animal feeds by a dehydrogenation reaction using selenium dioxide as the dehydrogenating agent. The dehydrogenation reaction may be carried out in the presence of a suitable organic solvent.

Abstract: A method for the rapid determination of the presence or absence of residues of antibiotic such as penicillin, in liquids, for example milk, and meat comprising introducing spores of a microorganism which possesses a high sensitivity for the antibiotic to be determined into an agar medium so that the spores are prevented from starting to germ due to lack of nutrients, but stay alive, and being sufficiently heavily inoculated that after addition of nutrients and incubation at or near optimal temperature in a short time sufficient growth has proceeded so that growth is either observable visually or its indicated by an indicator added to the agar medium, the said spore culture being allowed to solidify in upright test vessels having a cross-sectional dimension sufficiently small to require as little of the agar medium as possible but sufficiently large to enable a correct determination of inhibition of growth of the microorganism to be made, and having a height so that the vessel can contain a sufficient amount o