The kinetics of nitrate uptake, their assimilation in cell and the kinetics of nitrite release under different initial concentrations of nitrates is described with the help of mathematical model. Hypothesis of immutability of ferments taking part in transformation of different forms of nitrogen is assumed as a basis of the model. The content of these ferments can be changed only; the induction of their synthesis depends on the initial concentration of nitrates. It is shown that the maximum velocity of nitrate uptake depends on the initial concentration of nitrates and may be presented by hyperbolic function with saturation. On the example of seaweed Gelidium latifolium (Grev.) Bornet et Thur. (Rhodophyta) we showed that the maximum velocity of nitrate absorption can be 5 times more that the initial one.

Keywords: algae, kinetic, uptake, nitrogen, nitrate, model

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