Bacitracin is a mixture of related cyclic peptides produced by organisms of the licheniformis group of Bacillus subtilis var Tracy, first isolated in 1945. These peptides disrupt both gram positive and gram negative bacteria by interfering with cell wall and peptidoglycan synthesis.acitracin is composed of a mixture of related compounds with varying degrees of antibacterial activity. Notable fractions include bacitracin A, A1, B, B1, B2, C, D, E, F, G, and X. Bacitracin A has been found to have the most antibacterial activity.
The university operates two medical schools (University of Arizona College of Medicine - Tucson and the University of Arizona College of Medicine - Phoenix) and is affiliated with the region's only academic medical centers (Banner - University Medical Center Tucson and Banner - University Medical Center Phoenix).
The University of Arizona (also referred to as U of A, UA, or Arizona) is a public research university located in Tucson, Arizona, United States. Founded in 1885, UA was the first university in the Arizona Territory. The university includes the Banner â University Medical Center Tucson, which operates a separate 4-year M.D. college in downtown Phoenix. As of Fall 2014, total enrollment was 42,236 students. The University of Arizona is governed by the Arizona Board of Regents.