4. bio214 nutrient

4. bio214 nutrient - Microbial Growth and Nutrition Growth...

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Microbial Growth and Nutrition
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Growth Increase in cellular constituents that may result in: increase in cell number and/or size e.g., when microorganisms reproduce Microbiologists usually study population growth rather than growth of individual cells
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The Common Nutrient Requirements macroelements (macronutrients) C, O, H, N, S, P, K, Ca, Mg, and Fe required in relatively large amounts micronutrients (trace elements) Mn, Zn, Co, Mo, Ni, and Cu required in trace amounts often supplied in water or in media components Bacteria are composed of different elements and molecules, with water (70%) and proteins (15%) being the most abundant
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Growth Factors Essential organic nutrients Many bacteria lack the genetic and metabolic mechanisms to synthesize EVERY organic compound needed for survival Not synthesized by the microbe, and must be supplemented - Amino acids, vitamins
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Classes of Growth Factors 1. amino acids needed for protein synthesis 2. purines and pyrimidines needed for nucleic acid synthesis 3. vitamins function as enzyme cofactors
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Carbon Source Heterotroph (depends on other life forms) Organic molecules (sugars, proteins, lipids) Autotroph (self-feeders) – Inorganic molecules (CO 2 )
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Uptake of Nutrients by the Cell Some nutrients enter by passive diffusion Most nutrients enter by: facilitated diffusion active transport group translocation
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Net movement of molecules from a high concentrated area to a low
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4. bio214 nutrient - Microbial Growth and Nutrition Growth...

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