BIOL 2P98 Lecture Notes - Lecture 11: Scattering, Microbiology, Cell Membrane
19 Jan 2016
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Document Summary
Further increases in concentration results in greater turbidity. A standard curve can be prepared to relate od value to cell numbe. Biofilms: many microorganisms are sessile and grow attached to a surface rather, these attached microbes are members of complex communities called than free-floating (planktonic) biofilms, create a sticky slime polysaccharides, many cells enclosed in the slime. Attachment (adhesion of a few motile cells to a suitable solid surface) Active dispersal (triggered by environmental factors such as nutrient availability) Implicated in several medical and dental conditions, e. g. chronic wounds, kidney stones, periodontal disease: aeruginosa and aliginate (white) in sputum of cf patient. Temperature ph osmolality oxygen control of microbial growth. Temperature & microorganism growth: every microorganism has three cardinal temperatures, minimum, maximum, optimum often close to the temperature. Four classes based on optimal growth temperature: psychrophiles: low, mesophiles: midrange, thermophiles: high, hyperthermophiles: very high.
