BIOL 2100 Lecture Notes - Lecture 6: Organic Growth, Listeriosis, Thermophile
Document Summary
Physical requirements: temperature classify based on temperature requirement, effect of ph on growth, effect of osmotic pressure on growth. Chemical requirements: carbon, nitrogen, sulfur, and phosphorus, trace elements, oxygen classify based on oxygen requirements, organic growth factors. In the lab, ph buffers are included in the growth media to maintain proper ph. Osmotic pressure: microorganisms require water for growth cells are 80-90% water, osmosis/osmotic pressure effect of movement of water within a cell (membrane, effects of osmosis on bacterial cells. Dead sea: facultative halophiles do not require high concentration of salt but can tolerate up to 2% salt, most microorganisms grow at ~1. 5% salt, staphylococcus grows at 7. 5% salt concentration. Organic growth factors: organic compounds, essential, not synthesized by organisms, obtained from the environment, vitamins, amino acids, purines, and pyrimidines, some bacteria can synthesize vitamins. Culture media: material containing nutrients for microbial growth in lab, other definitions:
