title: Inhibition of clinically significant bacterial organisms in vitro by 2-acetylpyridine thiosemicarbazones.
abstract: Antibacterial activity of 65 2-acetylpyridine thiosemicarbazones and related compounds was determined by using clinical isolates of nine bacterial genera. Minimal inhibitory concentrations (MICs) of 0.002 to 0.062 micrograms/ml were obtained with 23% of the compounds for Neisseria gonorrhoeae and 0.016 to 0.062 micrograms/ml with 17% of the compounds for N. meningitidis. Staphylococcus aureus was inhibited in the MIC range of 0.125 to 0.5 micrograms/ml by 18% of the thiosemicarbazones, whereas 26% inhibited group D enterococcus with an MIC of 0.25 to 2.0 micrograms/ml. Poor antibacterial activity was shown toward the gram-negative bacilli, i.e., Pseudomonas, Klebsiella-Enterobacter, Shigella, Escherichia coli, and Proteus.
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D004755:Enterobacteriaceae / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D009343:Neisseria / Q000187:drug effects; D011549:Pseudomonas / Q000187:drug effects; D011725:Pyridines / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D013882:Thiosemicarbazones / Q000494:pharmacology*
chemical_list: D011725:Pyridines; D013882:Thiosemicarbazones