BIOLOGY 207 Lecture Notes - Lecture 12: Aquaporin, Irradiation, Antimicrobial Resistance
Document Summary
Chapter 5: environmental in uence & control of microbial growth. The control of microbes: 1) physical, 2) chemical, 3) biological. Microbes have both the fastest and the slowest growth rates of any known organisms. Some hot-springs bacteria can double in under 10 minutes. Deep-sea-sediment microbes can take as long as 10,000 years! Differences are determined by nutrition and niche-speci c physical parameters like temperature and ph. Clostridium perfringes can double their population in 10 min! I"m showing here is cluster that in per fringes that has a doubling time of 10 minutes. This is the most common type of foodborne illness in us. The cdc estimates there"s about a million cases of food borne illness each year. It"s commonly the culprit found on raw meat, such as poultry. This is the one that gives you diarrhea and cramps within hours of eating a contaminated food. Temperature: 20 degrees c 40 degrees c. Salt concentration: 0. 9% (iv bag or our blood)
