Any of a group of substances with antibiotic and antineoplastic properties originally isolated from soil-dwelling microorganisms (actinomycetes) of…

A crystalline antibiotic produced from several fungi; spec. that obtained from Penicillium claviforme, chemically identical with clavacin, n.

An antibiotic substance: one of a class of substances produced by living organisms and capable of destroying or inhibiting the growth of…

Any usually proteinaceous antibiotic produced by bacteria of one strain and active against those of another strain.

An aminoglycoside antibiotic that consists of a mixture of several substances produced by soil- or mud-dwelling microorganisms (actinomycetes) of…

A phytoalexin with antifungal and bactericidal activity that is formed in potato tubers infected with a pathogenic fungus.

Any of a group of peptides with antimicrobial properties that resemble those first identified in the skin of the African clawed frog, Xenopus laevis.