Ученые Института гидробиологии и экологии изучают морфологическое разнообразие и закономерности роста отолитов рыб для оценки питания каспийского тюленя (Pusa caspica) в периоды залегания на лежбищах.
Реферат: The acceptability and effectiveness in some situations, the practical application of dispersants for oil spill at sea is now well recognized and recorded in official documents in many countries and international organizations. To evaluate the quality offered to control the oil spills dispersants in our laboratory studies were conducted using the recommended techniques. Studies have been conducted on the impact of the proposed dispersant Kashagan oil in sea water of the Caspian Sea. On the basis of research has been done evaluating the effectiveness of dispersants at 5(o)C, 25(o)C and is given recommendation for their use.
Synthesis and biological activity of nitrogen-containing derivatives of estafiatin
Автор(ы): Merkhatuly N.*Vojtisek P.*Abeuova S. B.*Omarova A. T.*Iskanderov A. N.*
Реферат: The reactions of guaianolide of estafiatin with various amines were investigated. It was shown that the aminolysis reactions of ?-lactone ring of estafiatin or reactions of Michael-type conjugate addition or tandem conversions of Michael and Knoevenagel-type were carried out depending on the nature of amines. The regularity of proceeding of estafiatin reactions with secondary aliphatic and aliphatic-aromatic amines was detected. It lies in the fact that the reactions proceed exclusively by Michael reaction and they are completely regioand stereoselective. It was revealed that synthetic nitrogen-containing derivatives of estafiatin had antibacterial and antioxidant activity.
Synthesis of novel polymers on the basis of polycondensation of diamines with esters of tetracarboxylic acid
Автор(ы): Salkeeva L. K.*Taishibekova Ye. K.*Shibayeva A. K.*Sugralina L. M.*Omasheva A. B.*Zhortarova A. A.*Salkeeva A. K.*
Реферат: Polymerization of heterocyclic monomers is known to lead to the formation of polymers possessing complex of predictable practically useful properties, in particular, thermoplastic and heat-resistant ones. As object of research we used heterocyclic polyamide synthesized by polycondensation of ethyl ester of ethylenetetracarboxylic acid with polyfunctional diamine. For our research the method of low-temperature polycondensation which began to be applied recently was the most suitable method for obtaining polyamides. The advantage of this method is reducing the duration of the polycondensation and the possibility of obtaining products of high molar mass. Low-temperature polycondensation process is also used for obtaining unstable at the melting point polyamides with aromatic nuclei.
Molecular masses and characteristics of polyethileneglycolmaleate, polypropyleneglycolmaleate, polyethileneglycolphthalate, polypropyleneglycolphthalate
Автор(ы): Sarsenbekova A. Zh.*Zhortarova E. A.*Burkeev M. Zh.*Tazhbaev E. M.*Kazhmuratova A. T.*
Реферат: The molecular masses and characteristics of such unsaturated polyester resins as polyethyleneglycolmaleate, polypropyleneglycolmaleate, polyethyleneglycolphthalate and polypropyleneglycolphthalate were studied. It was determined the weight average molecular weight and number average molecular weight of unsaturated polyester resins, and it was carried out the comparative analysis of the obtained data.
Investigation tetranuclear complexes of iron (II) by Mossbauer spectroscopy
Автор(ы): Kassenova N. B.*Yerkassov R. Sh.*Baisalova G. Zh.*
Реферат: A series of Fe (II) complexes, {[(tpma)Fe(-CN)](4)}X(4) (X = ClO(4) {-}, BF(4) {-}, and PF(6) {-}; tpma = tris(2-pyridylmethyl) amine) were prepared by reacting the {Fe(tpma)}{2+} building block with (Bu(4)N)CN. All three complexes exhibit gradual temperature-driven spin crossover (SCO) associated with the high-spin (HS) lowspin (LS) transition at two out of four metal centers. The evolution of HS and LS Fe (II) ions with temperature was followed by a combination of Mossbauer spectroscopy.
Методика приготовления образцов-излучателей для определения меди (II) методом спектроскопии диффузного отражения
Автор(ы): Ягофарова А. Я.*Досмагамбетова С. С.*Ташенов А. К.*
Реферат: Изучена возможность разработки способов приготовления образцов сравнения для определения меди (II) методом спектроскопии диффузного отражения. Предложена методика приготовления образцов-излучателей. Проведено исследование поверхности образца-излучателя на наличие мелких дефектов и однородности. Показано влияние продолжительности хранения на воспроизводимость аналитических определений полученных образцов. Установлено, что полученные образцы сравнения позволяют проводить измерения как по спектрам поглощения, так и по спектрам диффузного отражения.
Evaluation of heat-accumulating properties of organic acids and their composites with REE
Автор(ы): Amerkhanova Sh. K.*Alexandrov V. D.*
Объем документа: C. 33-37
МРНТИ: 31.15.31*
Ключевые слова: свойства хранения тепла*органические кислоты*пальмитиновая кислота*стеариновая кислота*хлорид цезия*кристаллизация*
Реферат: In this paper the melting heat of palmitic and stearic acids was defined by the electrochemical method. It was shown that the melting process is accompanied by heat emission. During all time of thermal cycling the behavior of curve is preserved. It is found that for a mixture of palmitic acid and REE melting process is accompanied by changes in the structure of the complex and ion pairs. It was revealed that the heat of fusion of the composite of palmitic acid and cesium chloride is higher than of the organic acid through the formation of crystallization centers with a high melting point. Consequently, the mixture of organic acids containing cesium ions may be recommended as a heat accumulating material.
Study of polymetallic Zhezkazgan deposit ore\'s flotation using phosphorus collectors
Реферат: Sorption of collectors - dibuthyldithiophosphate of ammonium and sodium on samples of polymetallic ores was investigated. Values adsorption equilibrium was determined. The sorption curve of selective collector (dibuthyldithiophosphate sodium) was obtained. Also in the paper the comparative analysis of the flotation properties of dibuthyldithiophosphate ammonium and sodium respect to polymetallic ore of deposit Nurkazgan is given. A high selectivity of dibuthyldithiophosphate solution was established that enabled the development of flotation circuit.
Features of sorption of lead (II) and cadmium (II) on carbon sorbent of wood nature
Автор(ы): Amerkhanova Sh. K.*Zhaslan R. K.*Uali A. S.*
Реферат: The carbon material of the wood nature modified with phosphoric acid with the subsequent carbonization at a temperature of 600(o)C was used as a sorbent. Protodyakonov\'s equations describing influence of all factors the generalized equations (рН, duration of contact of a sorbent with solution, initial concentration of metals\'ions, temperature) on the sorption capacity of sorbent were obtained as a result of studying cadmium (II) and lead (II) ions\' sorption. The analysis of these results allows concluding that sorption of lead (II) and cadmium (II) ions on sorbents occur rather actively. Also the calculation of basic thermodynamic and kinetic parameters of the sorption process was carried out.
Растворимость в системе хлорид марганца - карбамид - хлороводородная кислота - вода при 25 (o)C
Автор(ы): Еркасов Р. Ш.*Несмеянова Р. М.*Колпек А.*Байсалова Г. Ж.*Абдуллина Г. Г.*Оразбаева Р. С.*
Объем документа: C. 48-55
МРНТИ: 31.17.15*
Ключевые слова: метод растворимости*четырехкомпонентная система*карбамид*хлороводородная кислота*амидкислота*координационные соединения марганца*
Реферат: Методом растворимости при 25(o)С изучены гетерогенные равновесия в четырехкомпонентной системе: хлорид марганца - карбамид - хлороводородная кислота - вода. Найдены закономерности взаимного влияния компонентов друг на друга, концентрационные границы образования соединений, существование которых было ранее установлено при изучении растворимости составляющих трехкомпонентных систем, а также двух новых координационных соединений, содержащих в своем составе одновременно хлорид марганца, карбамид и хлороводородную кислоту.
