BIOLOGY 2EE3 Lecture Notes - Lecture 6: Disodium Phosphate, Ammonium Sulfate, Monosodium Phosphate
4 Dec 2017
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Composition of microbes: polypeptides 50-55, nucleic acids (dna, rna) 2-5, lipids 10, polysaccharides 6-7% Microorganisms must obtain these elements from their environment. To build macromolecules: c source: glucose or lactose, sucrose, etc, n source: ammonium chloride, ammonium sulfate, p source: monosodium phosphate, disodium phosphate, s source: magnesium sulfate, etc. Various micronutrients: including several metal ions (sodium, magnesium, manganese, iron, zinc, cobalt, etc. ) Prototroph: synthesizes all cellular components from basic nutrients glucose, ammonia, phosphate and sulphate. Prototroph grow in a mineral salts medium with a carbon source. Amino acids regarded as essential for humans are phenylalanine, valine, threonine, tryptophan, isoleucine. Chemotrophs: energy from oxidation of reduced organic or inorganic compounds. Phototrophs: energy from light: chemicals: organic or inorganic electron source organic or inorganic, light: organic or inorganic electron source organic or inorganic carbon source carbon source. Organotrophs: electron from organic molecules (e. g. , glucose) Lithotrophs (rock-eaters): electrons from inorganic sources (hydrogen gas, Heterotrophs assimilate carbon in preexisting organic form.
