BIO 226 Chapter Notes - Chapter 6: Mycobacterium Tuberculosis, Turbidity, Staphylococcus Epidermidis
16 Oct 2018
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Psychrophile- cold-loving microbe; can grow at 0 c but optimum at 15 c. Psychrotroph- food spoilage microbe; grow between 0 c and 20-30 c. Mesophile- moderate-temperature-loving microbe; grow between 25-40 c but optimum at 37 c . Thermophile- heat-loving microbe; optimum growth at 50-60 c . Hyperthermophile- extreme heat microbe; optimum at 80 c or above ph: Acidophile- microbe remarkably tolerant of acidity; most extreme can survive at a ph of 1. Most bacteria prefer a ph between 6. 5 and 7. 5. Fungi prefer a ph around 5 to 6. Ph of culture media has to be controlled because bacteria often produce acids that interfere with their own growth. Controlled by adding chemical buffers (peptones, amino acids or phosphate salts) to the growth medium. Occurs when microbe is put in a hypertonic solution (concentration of solutes is higher outside than inside)
