
A group of antibiotics that contain 6-aminopenicillanic acid with a side chain attached to the 6-amino group. The penicillin nucleus is the chief structural requirement for biological activity. A change in the nucleus will lead to a decrease in anti-bacterial activity. The side-chain structure determines many of the antibacterial and pharmacologica...
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http://www.encyclo.co.uk/local/20973

A large group of antibiotics derived primarily from fungi of the genus Penicillium; of pivotal importance in the treatment of diseases caused by certain bacteria such as the streptococci, clostridia, and spirochetes, penicillins interfere with the vital synthesis of bacterial cell walls.
Found on
http://www.thehorse.com/Glossary.xhtml?L=P
No exact match found.