Pyatigorsk State Pharmaceutical Academy

Stavropol kray, Russia

Pyatigorsk State Pharmaceutical Academy

Stavropol kray, Russia

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Dorofeyev V.,South Russia State Technical University | Dorofeyev Y.,South Russia State Technical University | Babets A.,South Russia State Technical University | Goncharova T.,South Russia State Technical University | Vodolazhenko R.,Pyatigorsk State Pharmaceutical Academy
International Powder Metallurgy Congress and Exhibition, Euro PM 2013 | Year: 2013

A reduced pure iron powder was used as a basic material in the production of wear resistant iron - molybdenum carbide composites. Content of powders of milled eutectic white iron and molyb-denum or ferromolybdenum was varied as well as the heating conditions of porous preforms prior to hot forging. In the course of the preheating the particles of cast iron fuse and wet the particles of iron and molybdenum (or ferromolybdenum). This is accompanied by carbon diffusion from cast iron parti-cles into the depth of particles of matrix and molybdenous addition as well as by the formation of fine molybdenum carbides, which are variable in stoichiometric composition. The heating conditions' opti-mization together with the performance of the normalization provided for homogenization of material on carbon as well as for absence of "soft" zones poored in carbon. Diffusive pores near carbide parti-cles are not observed. Excessive intermetallic phase at the grain boundaries of iron matrix does not precipitate. Hot forging in the presence of the liquid phase makes possible composites with high wear and thermal shock resistance resulting in a possibility of crack-free quenching in water.


Ishchenko Z.V.,Pyatigorsk State Pharmaceutical Academy | Yunusova S.G.,RAS Institute of Organic Chemistry | Gusakova S.D.,Academy of Sciences of Uzbekistan | Yunusov M.S.,RAS Institute of Organic Chemistry | And 2 more authors.
Chemistry of Natural Compounds | Year: 2013

Neutral (NL) and polar (PL) lipids including glyco- (GL) and phospholipids (PhL) were isolated and their contents were determined from seeds and rhizomes with roots (RR) of Helleborus abchasicus and H. caucasicus in two development phases that were introduced into Pyatigorsk Botanical Garden. The amount of NL in subterranean organs increased from flowering to fruiting phases. The PL content in roots of H. abchasicus increased during fruiting and was independent of the vegetation stage in H. caucasicus. GL dominated in RR. The GL and PhL ratio in seeds was practically identical. The fatty-acid composition of all lipid groups in the two development phases of the introduced plants was determined. Subterranean organs and seeds of the two Helleborus species contained alkaloids, a part of which was extracted with the PL. The alkaloid content in RR during fruiting was 0.63% in H. abchasicus; 0.49%, in seed pulp; 0.26%, in H. caucasicus; and 0.05% in seed pulp of the starting raw material mass. © 2013 Springer Science+Business Media New York.


Vernikovskii B.V.,Pyatigorsk State Pharmaceutical Academy | Stepanova E.F.,Pyatigorsk State Pharmaceutical Academy
Russian Journal of General Chemistry | Year: 2012

Data on the immobilization of proteolytic enzymes for creation of medicines for the first phase of wound healing are summarized. The most common methods of immobilization, media, and pharmaceutical forms are characterized. © Pleiades Publishing, Ltd., 2012.


Dorofeyev V.,South Russia State Technical University | Dorofeyev Y.,South Russia State Technical University | Vodolazhenko R.,Pyatigorsk State Pharmaceutical Academy | Goncharova T.,South Russia State Technical University
Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2011 | Year: 2011

The structure and properties of iron base powder phosphorous materials, obtained by the hot forging (HF) of porous preforms in the presence of liquid eutectic phase, have been studied. Blends were produced on the base of reduced pure iron PZhV 2.160.26 powder as well as on the base of water atomized low-alloyed iron powder Astaloy A. For alloying by phosphor, powder of milled ferrophosphorus was used. The carbon was mixed in the form of pencil graphite powder. The content of ferrophosphorus and graphite in blend, the temperature of heating of porous preforms before HF and also the temperature of sample annealing after HF were varied. Increasing the time of heating of performs prior to HF is favourable to the diffusion solution of film of liquid phosphide eutectic, which was formed at the initial stage of heating. The values of time of preliminary preform heating should be optimized. These values are heating temperature dependent. The liquid phase presence in the process of HF decrease the energy needed for material densification, but it negatively influences the plasticity and fracture toughness of samples. The performance of the sample annealing after HF provides a means for the solution of eutectic film and for the improvement of these properties.


Dorofeyev V.,South Russia State Technical University | Dorofeyev Y.,South Russia State Technical University | Vodolazhenko R.,Pyatigorsk State Pharmaceutical Academy
Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010 | Year: 2010

The aim of the work is to study the possibility of using of cast iron particles as the car-bonaceous additive in the manufacture of hot-deformed powder steels. Reduced pure iron PZhV 2.160.26 powder was drawn as a basis in the preparation of blends. For alloying by carbon the powders of milled cast irons (Fe-4.3C (I); Fe-3.75C-4.0Si (II); Fe-4.0C-1.2Mn-12.5Ni (III)) were used. The cast iron powder content and the duration as well as the temperature of heating of porous preforms before hot forging were varied. It is found that the increase of heating temperature in excess of 1200 0C is liable to formation of thin eutectic layer on the boundaries of particles of iron and cast iron I, II. This causes the increase of me-chanical properties of produced materials.

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