BIOL240L Study Guide - Final Guide: Saccharomyces Cerevisiae, Petri Dish, Chromophore
25 Feb 2017
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Bacterial mutants may arise spontaneously or are produced by mutagens (uv rays, x-rays, nitrous acid, alkylating agents, base analogues) Highly resistant mutants can sometimes be obtained in one step. Antibiotics: chemical agents that are produced by organisms, some can control other organisms. Disc-plate technique: tests the susceptibility of microorganisms to many different antibiotics: inoculate organism on agar plate, place discs containing antibiotics on inoculated surface, incubate, observe zones of inhibition. Rate of diffusion is dependent on factors: Rate of diffusion of the drug through agar. Experiment 27 evaluation of chemical antimicrobial agents. Disinfectant: the inhibition or killing of microorganisms that may cause disease. Cidal disinfectant: must be capable of killing pathogens while it is in contact with them. Disinfectant can be bactericidal, virucidal/static, sporicidal/static or germicidal/static, Must pay attention to factors when choosing a disinfectant. Oligodynamic action: the ability of small amounts of heavy metals to exert a lethal effect on bacteria.
