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Unformatted text preview: Chapter 7 Microbial nutrition-Nutrition is a process of acquiring chemical substances from the environment-The absorbed nutrients are used for-Energy yielding processes-Growth-The chemical elements absolutely needed- essential nutrients-Macronutrients: C, H, O-Micronutrients: Mn, Zn, and Ni Sources of essential nutrients-Carbon Structural backbone of lining matter 50% of microbial dry weight is Carbon Autotrophs derive carbon from CO 2 Heterotrophs derive carbon from organic matter-Nitrogen 14% of microbial dry weight is Nitrogen Required for protein, DNA, RNA, and ATP synthesis Microorganisms derive nitrogen by: Breaking down proteins into amino acid NH 4- ammonium ions N 2-Nitrogen fixers-Free-living-Symbionts with plants NO 3-nitrate Other elements-Sulfur- synthesis of sulfur- containing amino acids-Phosphorus- synthesis of DNA, RNA, ATP and phospholipids of cell membrane-Trace elements- minerals needed as enzymes cofactors.-Growth factors- organic chemicals that cant be synthesized by certain organisms (vitamins, certain amino acids) Nutritional types Energy Source Light Chemical Carbon Source CO 2 CO 2-Photoautotroph-Chemoautotroph Organic Organic-Photoheterotrophs-Chemoheterotrophs Autotrophs-Microorganisms use chemicals or light as source of energy-Chemoautotrophs- acquire energy from inorganic and organic chemicals-Photoautotrophs- use light as their energy source Heterotrophs-Chemoheterotrophs Energy ad carbon source from organic molecules Saprobes derive nutrients from dead organic material-Opportunistic pathogen- a saprobe infecting the compromised host Parasites derive nutrients from living organisms-Pathogens- harm host (i.e. streptococcus)-Obligate intracellular parasites (rickettsias, Chlamydias, viruses) Microbial Nutrition...
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This note was uploaded on 09/16/2011 for the course MCB 2000 taught by Professor Gantar during the Fall '08 term at FIU.
- Fall '08