lecture notes-cell nutrients

lecture notes-cell nutrients - Cell Nutrients Nutrients...

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Cell Nutrients Nutrients required by cells can be classified in two categories: - Macronutrients are needed in concentrations larger than 10 -4 M. C, N, O, H, S, P, Mg 2+ , and K + . - Micronutrients are needed in concentrations less than 10 -4 M. Mo, Zn, Cu, Mn, Ca, Na, vitamins, growth hormones and metabolic precursors.
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Cell Nutrients- Macronutrients Carbon compounds are the major sources of cellular carbon and energy. Heterotrophs use organic carbon sources such as carbohydrates, lipid, hydrocarbon as a carbon source. Autotrophs can use carbon dioxide as a carbon source. They can form carbohydrate through light or chemical oxidation. In aerobic fermentations, about 50% of substrate carbon is incorporated into cell mass and about 50% of it is used as energy sources. In anaerobic fermentation, a large fraction of substrate carbon is converted to products and a smaller fraction is converted to cell mass (less than 30%).
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Cell Nutrients- Macronutrients Carbon sources: - In industrial fermentation, the most common carbon sources are molasses (sucrose), starch (glucose, dextrin), corn syrup, and waste sulfite liquor (glucose). - In laboratory fermentations, glucose, sucrose and fructose are the most common carbon sources. Ethanol, methanol and methane also constitute cheap carbon sources.
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Cell Nutrients- Macronutrients Nitrogen compounds are important sources for synthesizing protein, nucleic acid. Nitrogen constitutes 10% to 14% of cell dry weight.
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This note was uploaded on 02/13/2012 for the course CHM 3210 taught by Professor Kennell during the Fall '11 term at University of Florida.

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lecture notes-cell nutrients - Cell Nutrients Nutrients...

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