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Sevastopol, Ukraine

Bondarev V.,Sevastopol State University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

The models of multi-input pulse neuron in generalized vector-matrix form are proposed in order to solve digital signal processing problems. Nonrecursive and recursive digital models are considered. Nonrecursive models use the description of linear systems in a convolution form and the input signal is presented as a sequential or a parallel binary vector. Recursive models are based on the description of linear systems in the time domain and use an impulse response and a state space approaches. A learning rule for the mentioned models of a pulse neuron is derived to solve a problem of signal reconstruction and adaptive noise suppression. Results of a computer simulation are presented. © Springer International Publishing Switzerland 2016. Source

Gostyukhina O.L.,Kovalevsky Institute of Marine Biological Research | Andreenko T.I.,Sevastopol State University
Journal of Evolutionary Biochemistry and Physiology

The level of reduced glutathione (GSH) and activity of glutathione-coupled antioxidative enzymes, glutathione peroxidase and glutathione reductase, as well as the level of glucose, carbamide and amino acids were studied in the hepatopancreas, gills and foot of the Black Sea mollusk Anadara kagoshimensis. A highest level of GSH and highest activity of glutathione peroxidase were detected in the foot indicative of an active antioxidative role glutathione plays both within the enzyme and independently. The levels of glucose, amino acids and carbamide were highest in the hepatopancreas and gills and lowest in the foot. A possible involvement and role of these low molecular weight antioxidants in the defense of mollusk tissues from free radical oxidation and in the adaptation to hypoxic habitat is considered. © 2015, Pleiades Publishing, Ltd. Source

Holyavka M.G.,Voronezh State University | Evstigneev M.P.,Sevastopol State University | Artyukhov V.G.,Voronezh State University | Savin V.V.,Baltic Federal University
Journal of Molecular Catalysis B: Enzymatic

We developed highly stable heterogeneous preparations of inulinase immobilized on the ion-exchange matrixes and show that such preparations effectively split the chemically pure inulin and the inulin contained in plant extracts. The optimal conditions of hydrolysis are created for the migration of inulin solution from top to bottom (the downsteam flow) through the column filled by immobilized compounds extracted from Kluyveromyces marxianus and Helianthus tuberosus with the flow rate of 3 mL/min. For the bottom-up migration of the inulin solution (i.e. the upstream flow) through the column the flow rate of 5 mL/min was found to be the most optimal for the hydrolysis. When the extract of H. tuberosus was allowed to pass through the column filled by the immobilized plant inulinase from top to bottom with the flow rate of 5-10 mL/min, the conditions for hydrolysis appear to be the most optimal. The conditions for hydrolysis were also found to be favourable for the bottom-up moving of the H. tuberosus extract through the column for the flow rate of 3-5 mL/min. For the yeasts inulinase immobilized on VION KN-1 the most optimal flow rates of the H. tuberosus extract in the reactor were found to be similar for the following rates of inulin flow, viz. 3 mL/min for the downstream flow and 5 mL/min for the upstream flow. A theoretical description of the process of the inulin hydrolysis has been proposed and experimentally verified, which allows predicting the time of the full hydrolysis at different operating conditions with an error not exceeding 20%. It could be applied for the design of continuous reactors. © 2016 Elsevier B.V. All rights reserved. Source

Kostjukov V.V.,Sevastopol State University | Evstigneev M.P.,Belgorod State University
Biophysics (Russian Federation)

Generalization of current views on energy analysis of complex formation of biologically active compounds with nucleic acids is represented and the outlook for further developments is determined. © 2014, Pleiades Publishing, Inc. Source

In this paper, a new method for in-plane free vibration analysis of rectangular orthotropic plate is presented. The cases for completely clamped and completely free plates are considered in detail. The boundary value problem is essentially reduced to infinite systems of linear algebraic equations. New mathematical theory and associated results are presented for investigating the asymptotic behavior of non-trivial solution of quasi-regular infinite system. By enhancing the theory, an effective and accurate algorithm for determining the natural frequencies and modes shapes vibrations is developed. The accuracy and computational efficiency of the method are demonstrated by examples. © 2016 Elsevier Ltd. Source

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