LSCI 230 Lecture 1: MICROBIOLOGY NOTES MIDTERM 2
3 Nov 2017
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Sources of nutrients: macronutrients: required large amounts. Nitrogen: nh3, no3-, n2, organic nitrogen compounds (amino acids, etc. ) Sulfur: h2s, so4 2-, organic s compounds (cysteine), metal sulfide (fes, cus, Potassium: k+ in solution or various mg salts. Magnesium: mg2+ in solution or various salts. Calcium: ca2+ in solution or various ca2+ salts. Sodium: na+ in solution or various na+ salts: micronutrients: required small amounts. Iron: fe2+, fe3+, necessary for all of the organisms, it is needed for all the t enzymes to generate energy. 20: growth factors: vitamins, amino acids, purines, pyrimidines or other organic molecules that the microorganism needs for growth but cannot synthesize by itself. Some growth factors are the by-product or waste of another organism: there is a competition for the micronutrients and especially for iron. Pathogenic bacteria that cause infections in humans use siderophore to steal the iron.
