Microbial Metabolism
Incorporation of atmospheric N2to NH4+ occurs via the process of

nitrogen fixation
deamination
transamination
assimilatory nitrate reduction

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

accumulation of solute against an electrochemical gradient
accumulation or concentration of solute against an electrochemical gradient
concentration of solute against an electrochemical gradient
metabolic energy

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