NU FS363 Lecture Notes - Lecture 2: Listeria Monocytogenes, Food Microbiology, Petri Dish
17 Oct 2016
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If there is yeast growing on yogurt or vegetables = spoilage. Viable spores (clostridium botulinum produces the most toxic substance botox) Viable nonculturable cannot grow on petri dish so cannot be cultured in a lab. Bacteria (viable; spores; viable, nonculturable) different forms. Viruses (cid:894)don"t want this in our food supply(cid:895) Parasites (cid:894)don"t want this in our food supply(cid:895) Microorganism found in foods: (canned food is sterile) Intestinal tract of humans and animals (faeces) -mostly microorganisms. Chemoheterotrophs use organic compounds as a source of energy for production of atp, which is the energy supply for a range of cellular activities, including cell wall synthesis, movement, etc. Vegetable contamination (manure to fertilize the soil, and vegetables grow in the soil) At the right temperature and the right place = good (eg. cheese) At the wrong temperature and the wrong place = bad (can cause problems) Irrigation, washing the food in pro(cid:272)essing plant (cid:894)shouldn"t happen (cid:271)ut (cid:272)an happen(cid:895)
