Studies on antibiotics

Abstract
Geodin was isolated from the culture medium of Aspergillus terreus N.C.T.C. 3911. It possesses high antibiotic activity against Gram-positive bacteria. Various substances chemically related to penicillic acid and clavatin were synthesized and tested. Antibacterial activity is associated with the following structure C[long dash]CO[long dash]C=C[long dash]with an H atom on the a or [beta][long dash]C atom. The inhibitory effect of cys-teine on these antibiotics indicates that the antibiotic activity involves an enzyme system containing[long dash]SH groups.