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Unformatted text preview: and parts of cells. So, when the environment became oxygenic, bacteria had to find a way to break down h202, superoxide, via catalase, superoxide reductase/dismutase. Radiation-Resistance Mechanisms: Carotenoids (UV), DNA repair systems, Genetic redundancy (multiple chromosomes and plasmids, multiple copies of critical genes. -Most damaging radiation is ionizing radiation ( DNA and protein damage)-Highly radiation resistant bacteria: clostridium botulism, deinococcus radiodurans (five times the most resistant endospores). Antimicrobial Chemical Agents-Difference between antiseptic and disinfectant. Antiseptic: living tissue. Disinfectant: inanimate surfaces. Growth factor analogs: stop a certain enzymatic step: Sulfanilimides Microbial Ecology-The study of how microorganism interact with each other and their environments....
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- Fall '07