BIO 215 Lecture Notes - Lecture 4: Streptococcus, Dental Caries, Interferon
Document Summary
O negative: free radicals will cause problems due to the negative charge so they must be neutralized. Bacteria growing in the presence of atmospheric oxygen: aerobe. These are the most common pathogens to humans. These do not have a neutralizing enzyme. (attacking free radicals). Grows in presence or absence of oxygen: facilitative anaerobe. Normal atmospheric level of oxygen is toxic, but it requires some: microaerophile. These do produce enzymes, but at a smaller amount so they can only fight limited amounts of free radicals. If you have a deep cut the cells begin to dye because they are not getting oxygen, becoming anaerobic. Spores are here and waiting to germinate the area to cause infection. Sod converts superoxide to hydrogen peroxide, which is converted to water and o2. Strict anaerobes have no sod making the oxygen lethal. Solutions with high salt or sugar concentrations that tend to draw water out. Eosin turns to metallic green when ph drops below 6. 8.
