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15 Cards in this Set

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Ecology
The study of the interactions and relationships between living things and the environment.
Microbial Community
An assemblage of populations that interact with each other.
Gradients
A series of progressively increasing or decreasing differences in the growth rate, metabolism, or physiological activity of a cell, organ, or organism.
anoxic
Anaerobic. Devoid of oxygen.
aerobic
Oxygen is present.
Oxygenic phototrophic organisms
They use light to generate carbohydrates(and other organic compounds) and oxygen from carbon dioxide and water.
photosynthesis
6CO2 (Carbon dioxide) + 6H2O(water) -> C6H12O6 (carbohydrates) + 6O2(oxygen)
or

6CO2 + 6H2S -> C6H12O6(biomass) + 6S(sulfur)
Clostridia
Strictly anaerobic bacteria that are poisoned by oxygen. Thrive in the deep anoxic mud and degrade cellulose into organic acids.
Desulfovibrio
Use the organic acids made by the Clostridia to vonbrty oxidized forms of sulfur (such as sulfate) into hydrogen sulfide. They generate the hydrogen sulfide gradient in the Winogradsky column.
Photosynthesis
The conversion of light energy to chemical energy that is stored in glucose or other organic compounds; occurs in plants, algae, and certain prokaryotes.
Chlorobium
Phototrophic green sulfur bacteria that are anoxygenic phototrophs since they can grow from light alone. They don't generate oxygen, however, they convert hydrogen sulfide to sulfur
Heterotroph
An organism that obtains organic food molecules by eating other organisms or their by-products.
Autotroph
An organism that obtains organic food molecules without eating other organisms or substances derived from other organisms. Autotrophs use energy from the sun or from the oxidation of inorganic substances to make organic molecules from inorganic ones.
Phototrophs
Organisms that obtain energy from light.
Chemotrophs
Organisms that obtain energy from chemicals.