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Progress in Earth and Planetary Science
Figure 2 | Progress in Earth and Planetary Science

Figure 2

From: Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies

Figure 2

Schematic illustrations of the autotrophic assimilation of inorganic substrates. Diagrams (a) and (b) indicate assimilation schemes for CO2 and nitrate, respectively. Diagram (c) is a scheme of the normal two-step model, and (d) is a more rigorous scheme based on Michaelis-Menten kinetics (Wada and Hattori 1978). The terms c, k, and ε indicate the concentration, rate constant, and isotopic fractionation, respectively.

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