title: Instability effects in diffusion analyses of antimicrobial activity.
abstract: Diameter reductions accompanying preincubation, and funnel-shaped diffusion zones from agar wells, readily demonstrate chemical and physical instability of preparations in antimicrobial analyses.
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000494:pharmacology*; D001431:Bacteriological Techniques / Q000592:standards*; D001681:Biological Assay / Q000592:standards*; D008892:Milk; D011309:Preservation, Biological; D013997:Time Factors
chemical_list: D000890:Anti-Infective Agents