BIOL345 Lecture Notes - Microbial Ecology, Listeria Monocytogenes, Food Microbiology
20 Nov 2013
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Me2 organisms of interest: bacteria: gram positive, gram negative; aerobes and anaerobes fungi: filamentous (molds), single-celled (yeasts); almost always aerobes viruses: e. g. , hepatitis a, noroviruses parasites: worms, protozoa. ~30,000 items in typical grocery store: why do certain microorganisms grow (or not grow) in particular food environments, when growth occurs, what do the microorganisms do? (activity) quality. Loading safety spoilage microorganisms microbial pathogens shelf life of food health risk of food. Me3a examples of food spoilage by fungi recall from biol 241. Bacterial growth in batch culture lag, exponential phases are critical in spoilage. Loading: the food is analogous to the flask of growth medium . Rh of airspace = 90% bell jar aw = Aqualab series 3 water activity meter (decagon devices: works by measuring dew point; relating erh to aw (fig 2. 4, montville et al, 2012; fig 2. 6 2nd ed)
