09.12.2012 Views

Fundamental Food Microbiology, Third Edition - Fuad Fathir

Fundamental Food Microbiology, Third Edition - Fuad Fathir

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IMPORTANT FACTORS IN MICROBIAL FOOD SPOILAGE 267<br />

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6. How can psychrotrophic bacteria be arbitrarily grouped? Give examples of two<br />

bacterial species from each group. Also, give two examples each of thermoduric,<br />

thermophilic, and aciduric spoilage bacteria.<br />

7. Define aerobic respiration, anaerobic respiration, and fermentation. List four<br />

metabolites (for each) associated with (a) odor and (b) gas formation from food<br />

nutrients.<br />

8. Discuss the importance of preferential nutrient metabolism by microorganisms<br />

and the nature of food spoilage from this, using meat and milk as examples.

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