HTM 2700 Lecture Notes - Lecture 10: Room Temperature, Antitoxin, Diplopia

• School: University of Guelph
• Department: Hospitality and Tourism Management
• Course: HTM 2700
• Professor: Alison Crerar

Document Summary

Bacteria classified according to temperature for optimum growth. Can survive at 0 degrees celsius or below. Some bacterial spores can survive up to 116 degrees celsius (ex: clostridium botulinum spores) Can also survive longer heat treatments greater than 55 degrees celsius. Vegetative cell: grows and maintains life cycle. Spores: dormant state produced under adverse conditions. Bacteria grow and multiply as vegetative cells. In extreme heat or cold conditions some bacteria produce spores. Spores have thick cell walls which protect cell contents (nucleus) from environment. Spores are one of the most resistant forms of life. Yeast, molds and most bacteria are destroyed at boiling water temperatures (100 degrees. C. botulinum spores require temperatures of 116 degrees celsius or higher to be destroyed. Requires: anaerobic conditions, ph greater or equal to 4. 5 and aw greater or equal to 0. 90. When the spores germinate they form toxin-producing cells. C. botulinum toxin is one of the deadliest known, causes botulism food poisoning.