Lesbayev Bakhytzhan Tastanovich is an Associate Professor and author of 80 publications and 9 patents. His scientific interests are chemical physic, nanotechnology, science dealing with combustion.
The combustion process is a complex chain chemical reaction, passing through a number of parallel elementary acts: Nucleation reactions (formation of active radicals), branching (increase in the number of radicals in the reaction), continuation and termination of the chain (radical recombination). At present, studies related to the nucleation and growth of solid carbon product in the flame indicate that the reaction routes for the formation of precursors of aromatic molecules, CnHm, are not universal for various fuels end depend on the kinetics of formation of the active radicals OH, H, O, HO2, CH3, С2Н, НСО, С2Н3, ions and molecules. In the proposed study, the initial stage of combustion of each fuel is carried out on a separate burner with the possibility of subsequently combining the flames at different heights from the burner matrix to form a combined reaction zone. This makes it possible to influence the structure and property of the resulting final combustion products by combining the intermediate oxidation products of various types of hydrocarbons in the reaction zone of the combined flame. In the past years there are some works concerning synthesis methods of nanosized metal oxide particles in flames. Based on the above, in proposed work there is a purpose for investigation of nanosized metal oxide nanoparticles at joint organization of combustion process of propane and alcohol solution of metal salts. Electron microscopy studies shows that join combustion of propane and ethanol solution with nickel salt leads to the formation of nickel oxides of rounded shape with scatter in size of 50-300 nanometres. The results of chemical analysis showed the carbon content of 60%, nickel content of 36% and an oxygen content of 6%. Magnesium and sodium present in small quantities and their presence in the samples is explained by used fuel.
In recent years, the importance of artificial materials has grown in medicine and biology. Advanced tissue damage therapies are concentrated on stem cells, which can be used for direct application to the damaged sites or for tissue engineering using appropriate scaffolds. In addition, biomaterial scaffolds are important for fundamental scientific research as relatively simple and physicochemically well-defined artificial templates of Extracellular Matrix (ECM), allowing studies of ECM signals controlling cell adhesion, spreading, growth, differentiation, functioning, viability, matrix degradation, etc. The advantage of the PLLA scaffold is its biodegradability; the ability to allow the cells to grow and form in the new tissue while gradually biodegrading. Stem cells derived from adipose tissue (ASC) are often studied. Adipose tissue is relatively abundant in many patients and is relatively easy accessible without considerable donor site morbidity due to its subcutaneous localization. In comparison with the other sources of stem cells in the human body, ASCs in the adipose tissue are present in much larger quantities, have a higher proliferation capacity and delayed senescence. ASCs can be differentiating in vitro into other cell types such as osteoblasts, chondroblasts or smooth muscle cells. In this work the influence of modified poly(L-lactic acid) surface on adhesion, proliferation of stem cells derived from adipose tissue was studied. The PLLA polymer film was activated with argon plasma and subsequently modified by hyaluronic acid or poly(ethyleneglycol). The surface was analyzed and characterized by various methods. The in vitro method determined the suitability of a substrate for ASC cultivation. The aim of this experiment was to determine a suitable type of PLLA modification allowing for an ideal interaction between the substrate and the cell.
Nikola Slepickova Kasalkova is an Assistant Professor of Materials Engineering at the University of Chemistry and Technology Prague, Czech Republic. She has completed her PhD from University of Chemistry and Technology Prague in 2011. Her main research activities include surface modification and characterization of materials; carbon layer, carbon and metal nanostructures preparation and characterization; surface analysis of materials (wettability, morphology); study of cells-material interaction, cyto-compatibility test and study of antibacterial properties of materials.