FOOD-SCI 150 Study Guide - Comprehensive Final Exam Guide - Acid, Bacteria, Yeast

• School: UMASS-Amherst
• Department: Food Science
• Course: FOOD-SCI 150
• Professor: Decker, McLandsborough, Park

Document Summary

Sponge/month has 7. 2 million/clean: 1,000-100,000 per tooth dirty: 100 million-1 billion per tooth. One of the first scientists to observe microorganisms. Microscope survived but he never told anyone how to use it. First to conceptualize and prove germ theory. Took the blood from the sick sheep and grew it outside of the animal. The microorganism must be demonstrable in all cases of the disease. The microorganism must be isolated from the diseased animal and grown in pure culture. The microorganism from this pure culture must cause the same disease when inoculated into a healthy animal. Produce many spores which can be transported via dust. Can withstand extremes in ph, water activity, temperature for growth. More resistant to extremes in ph, water activity, temperature than bacteria. Bacterial shapes can vary, rod or bacillus or cocci (round) or spiral. Spores are dormant (non-growing) forms of bacteria that are highly resistant to heat, drying, and cleaning agents.