Influence of Oscillatory Enzyme Activity on the Reaction Kinetics: Mathematical Model.

In this article, the model of a simple kinetic reaction process with an oscillating change in enzyme activity modulated by cosine-like function is considered. The model includes one substrate and one intermediate product in the reversible and irreversible enzymatic processes. The results obtained by numerical solutions show the small oscillations of enzyme-substrate complex with the phase shift in the steady state with respect to the oscillatory activity of enzyme.

Influence of heating time and pressure treatment of potato starch on the generation of radicals: EPR studies.

The influence of heating time and pressurizing time under pressure of 1 GPa on radicals generation in potato starch polymer was investigated by EPR. Potato starch was heated at two temperatures: 413 ± 2 K (140 °C) and 473 ± 2 K (200 °C) for 15, 30, 60, 120, 180, 240, 270 and 300 min and subdued to pressurizing under pressure of 1 ± 0.002 GPa for 6, 60, 300 and 1440 min.

Pressure-controlled plasticity of Cu(H2O)6(2+) complex and phase transition in Cs2Cu(ZrF6)2*6H2O.

The X-band EPR study of a polycrystalline Cs2Cu(ZrF6)2*6H2O demonstrates a feature of plasticity of the Jahn-Teller Cu(H2O)6 complex in the crystal lattice of this compound. The temperature- and pressure-induced evolution of the spectra shows that the copper complex is extremely sensitive to these factors, which due to the ferroelastic properties of the compound studied modify the internal tetragonal and orthorhombic strains acting on the complex. It is supported by the analysis of the temperature dependencies of the principal values of the g-factor under various pressures, indicating that the complex varies its shape adapting it to the varied conditions.