BLG 151 Lecture Notes - Lecture 4: Nitrogen Fixation, Nitrogen Cycle, Carbon Cycle
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19 Jan 2018
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Carbon source- often provides h, o, and electrons. Organisms that use organic compounds as carbon sources. Organisms that use carbon dioxide (inorganic carbon/compounds) as their carbon source. Photolithoautotrophs (photoautotrophs: energy source: light, carbon source: inorganic compound/co2, electron source: inorganic substances. Chemolithoautotrophs (chemoautotrophs: oxidizing chemical compounds, inorganic compound/co2, inorganic substances. Chemolithoheterotrophs: oxidizing chemical compounds, organic compounds, inorganic substances. Chemoorganoheterotroph (most pathogens: oxidizing chemical compounds, organic compounds, organic compounds. The nitrogen cycle- essential component of nucleic acids/proteins. Nitrogen fixation- process that converts n2 to ammonia. Denitrification- process that converts nitrate back to n2. Allows for study of a single type of microorganism. Can isolate individual cells using streak, spread, and pour plating techniques. Colony- a population of cells arising from a single cell (all identical cells in a colony) Involves technique of spreading a mixture of cells on an agar surface so that individual cells are well separated from each other.
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