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Lecture

MIP 300 Lecture Notes - Chemotroph, Primary Nutritional Groups, Thiobacillus


Department
Microbio, Immun, Pathology
Course Code
MIP 300
Professor
Erica Suchman

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13 March
Microbes in the environment
Functions
Decomposing organic matter (mineralization)
Produce food (photo, chemoautotrophs) for chemoheterotrophs
Modify substances for use by others: C, N, S, Fe, metals
Produce microbe inhibiting substances: limit survival of plants and animals
The carbon cycle: note there are microbes that can digest every known carbon source,
e.g. gasoline, concrete, anything you can think of
The Carbon Cycle
Autotrophs create organic material → heterotrophs use organic material, create CO2
autotrophs use
CO2in air
Photosynthetic and chemolithotrophic autotrophs fix CO2 into organic molecules, e.g.
sugar
Decay by microbes, chemoorganotrophic heterotrophs
By aerobic respiration, fermentation, or anaerobic respiration
Create CO2
Many microbes (bacteria, protozoa, algae) fix CO2 into organic materials (photosynthesis
or chemolithotrophy)
Eaten by small marine organisms, fish
The Nitrogen Cycle
N2 in air (inert)
Many soil microbes (bacteria, yeast) fix N2 into NH3(anaerobic respiration), which is
incorporated into amino acids by microbes and plants
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