FSHN 101 Lecture Notes - Lecture 22: Foodborne Illness, Microorganism, Exponential Growth

• School: University of Illinois
• Department: Food Science and Human Nutrition
• Course: FSHN 101
• Professor: Bohn Dawn

Document Summary

Spoiled milk, moldy bread: the (cid:862)ugly(cid:863) mi(cid:272)ro(cid:271)es are those that cause food-borne illness (food infection or food intoxication) Bacteria (narrowest ph range) < yeast yeast (-0. 86 aw) > mold (0. 70 aw) Spheres (cocci: size: small, typically around 1 micron (um) in length or diameter, nuclei: does not contain nucleolus, reproduction: asexual, capable of very rapid exponential growth. Log phase how quickly does the population double in size. Death phase dying off quicker than they are being produced. Important information: initial population = 1 viable food infection microorganism, unsafe population= 10,000 viable food infection microorganisms, lag phase generation time = 60 minutes, log phase generation time = 20 minutes.