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Ch 6 Microbial Nutrition Presentation

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Slide 1 Microbial Nutrition Chapter 6 Slide 2 The common nutrient requirements  Macroelements (macronutrients) – elements bacteria needs in large amounts  C, O, H, N, S, P, K, Ca, Mg, and Fe (know a few)  Required in relatively large amounts  C,O,H,N,S, and P  Components of carbohydrates, lipids, proteins, and nucleic acids  K, Ca, Mg, and Fe  Various roles  Enzymes (K, Mg, and Fe)  Heat resistance of endospores (Ca) Slide 3 The common nutrient requirements  Micronutrients (trace elements)  Mn, Zn, Co, Mo, Ni, and Cu  Required in little amounts  Often supplied in water or in media components  Presence of essential nutrients crucial for growth Slide 4 Growth Factors • Organic compounds • Essential cell components that the cell cannot synthesize, must get from environment • Must be supplied by environment if cell is to survive and reproduce Slide 5 3 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 Slide 6 Slide 7 Uptake of nutrients by the cell • Nutrients pass through a selectively permeable plasma membrane • Uptake must be specific • Cell needs to be able to acquire nutrients from a nutrient-poor environment • Goes against a concentration gradient Slide 8 Culture Media • A solid or liquid preparation used to grow, transport, and store microorganisms ...
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