| Abstract: | The oxidation of NADH by atmospheric oxygen in the presence of copper(II) aqua ions in a constant-agitation flow-type reactor was investigated. During the experiments the initial concentrations of the reagents ([NADH]0, [Cu2+]0) and their delivery rate (k0) were varied. It was established that there are four reaction regimes in the system: steady state (SS); low-amplitude periodic autooscillation (εR); high-amplitude periodic (SR1) and aperiodic (SR2) autooscillations. The three-dimensional region of existence for these regimes was constructed in the coordinates [NADH]0, [Cu2+]0, and k0. It was shown by statistical analysis that oscillations of the SR1 and SR2 types are due to stochastic resonance. L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauki, Kiev 03039, Ukraine. Translated from Teoreticheskaya i éksperimental'aaya Khimiya, Vol. 36, No. 2, pp. 95–100, March–April, 2000. |
