HYDROSTATIC PRESSURE - form amino acids for protein...

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HYDROSTATIC PRESSURE This refers to the pressure exerted by water in relation to its depth. Barophiles are organisms  adjusted to a very high hydrostatic pressure, living at depths of up to 1 ½ miles in the ocean.  These organisms (both procaryocytes and eucaryocytes exist) cannot live at lower pressures.       REQUIREMENTS FOR GROWTH—CHEMICAL  REQUIREMENTS CARBON All microbes require carbon for growth. Carbon is needed for synthesis of all organic  compounds. Half the dry weight of a bacterial cell is carbon.  Chemoautotrophs and photoautotrophs get their carbon from CO 2 Chemoheterotrophs must get theirs from organic compounds, which they also use for energy   NITROGEN, SULFUR, PHOSPHORUS   NITROGEN Nitrogen makes up about 14% of the dry weight of a bacterial cell. The main use of nitrogen is to 
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Unformatted text preview: form amino acids for protein synthesis. It is also required for synthesis of DNA, RNA, and ATP. Various ways organisms obtain nitrogen: 1. Break down proteins and recycle the amino acids into new proteins and other nitrogenous compounds. 2. Use nitrogen from ammonium ions (NH 4 +) 3. Use nitrogen from nitrates (compounds that dissociate to form nitrate ions NO 3 -4. Use gaseous nitrogen from the atmosphere. Bacteria able to do this are called nitrogen-fixing bacteria. These may live free in the soil, but often they are found within nodules on the roots of legumes—plants such as clover, soybeans, etc. This adds nitrogen to the soil—like free fertilizer from the air. Rhizobium and Bradyrhizobium are the most important genera....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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