ЛИМФОКИНЕТИЧЕСКАЯ АКТИВНОСТЬ КОМПОЗИЦИИ ДИГИДРОКВЕР-ЦЕТИНА И АРАБИНОГАЛАКТАНА

Purpose. To evaluate lymphokinetic activity of the dihydroquercetin and arabinogalactan composition.Material and methods. The investigation was carried out on male Wistar rats. Lymphokinetic activity was determined by the rate of lymph outflow through the puncture of cisterna chili after intragastricall administration of the dihydroquercetin and arabinogalactan composition with ratio 1 : 5 (50 mg/kg + 250 mg/kg).Results. It was established that lymphokinetic activity of the dihydroquercetin and arabinogalactan composition with ratio 1 : 5 (50 mg/kg + 250 mg/kg) exceeds activity of it´s components.Проведено исследование лимфокинетической активности композиции дигидрокверцетина и арабиногалактана.Эксперименты выполнены на крысах-самцах линии Wistar. Лимфокинетическую активность определяли по скорости оттока лимфы через прокол млечной цистерны после внутрижелудочного введения композиции дигидрокверцетина и арабиногалактана в соотношении 1 : 5 (50 мг/кг + 250 мг/кг).Установлено, что лимфокинетическая активность композиции дигидрокверцетина и арабинога­лактана в соотношении 1 : 5 превосходит активность ее отдельных компонентов

Use of Polarization Lidar for Investigation of Meteorological Formations

This paper presents the results of theoretical and experimental, investigations of depolarization characteristics of different meteorological formations. Experimental investigations are carried out with a monostatic lidar. The ruby laser radiation is polarized in a vertical plane. The radiation reflected is accepted by a lens system of 150 rom in diameter and a viewing angle of 12' and further it is divided by Wollaston prism into the components polarized orthogonally. In this case the principal plane of the prism is exposed parallel with the laser polarization plane. Investigations show the degree of radiation polarization, reflected from water clouds, to be changed within 1/0.7 (seldom up to 0.6) depending on their density. In most cases a signal reflected from the cloud leading edge is polarized completely. The time shift is observed between polarized and crosspolarized components of a Fignal, reflected from a cloud, depending on the density of a meteorological object. While penetrating into the cloud depth a degree of polarization decreases up to 0.8-0.7, and the character of this decrease is different for various types of clouds. For crystal clouds the shift between the components of the reflected signal is not observed and the magnitude of polarization degree amounts to 0.1/0.3 in comparison with water clouds. The polarization degree of radiation reflected by fog is not less than 0.6, and that in the rains of average intensity (about 5 mm/h) is always about 1. The authors have suggested an algorithm of numerical solution of nonstationary transfer equation in the vector form to forecast the influence of multiple scattering effects on polarization characteristics of the lidar light signal. The method of statistical simulation (Monte-Carlo technique) forms the basis of the algorithm. Numerical estimates obtained for a model of stratocumulus at lambda = 0.6943 microns under boundary conditions close to the conditions of natural experiment being discussed proved to be in a good agreement with the results of observation. Specifically, Fig. 1 shows the profiles of polarization (p) versus depth (L) of the following drop formations: fog (curve 1) with horizontal meteorological visibility of 4 km two stratocumulus at a height of 1100 m with the attenuation factors delta = 0.01m(exp -1) (curve 2) and delta = 0.05m(exp -1) (curve 3). Curve 3 shows the results of numerical estimates and the value of their statistical error

Особенности ион-транспортных процессов в модели артериальной гипертензии

Aim. To study the ionic mechanisms which underlie regulation contractile activity of vascular smooth muscles and the erythrocytes membrane potential from spontaneously hypertensive rats.Materials and methods. The effect of acetylcholine (ACX), 10 μM, and Ca2+ -ionophore A23187, 10 μM, on the contractile reactions of isolated smooth muscle segments of the aorta from 11-week-old spontaneously hypertensive rats (SHR) and Wistar – Kyoto rats (WKY) induced by phenylephrine (PE), 1 μM, was measured by the mechanography. 11-week-old SHR were divided into control and experimental groups depending on the drug administration (amlodipine 10 mg/kg given intragastrically). Blood pressure (BP) in SHR was measured before and after treatment. The amplitude of the hyperpolarizating response (HO) and the activity of Ca2+-dependent K+-channels of the erythrocyte membrane of SHR were performed with potentiometric method.Results. In response to the stimulating effect of the ACX or the calcium ionophore A23187, the smooth muscle segments of the aorta from the WKY and SHR precontracted with PE were relaxed. To the addition of the ACX, the vascular segments of the SHR responded with a stronger dilatation than the WKY segments, but not the action of the Ca2+-ionophore. Treatment of SHR with blocker of Ca2+-channels of L-type amlodipine caused a decrease the BP, and an increase in the relaxing effect of intact aortic segments on the ACX and Ca2+-ionophore. There was an increase the amplitude of HO and activity of Ca2+-dependent K+-channels of the erythrocyte membrane from SHR.Conclusion. Relaxation of vascular smooth muscle in SHR is caused by changes in the endothelial function and Ca2+-dependent ionic conductivity of the myocyte membrane. An increase of the hyperpolarizating response of the erythrocyte membrane from rats with spontaneous hypertension is associated with activation of potassium channels. The selective effect on these intracellular targets can serve as a basis for the development of antihypertensive drugs.Цель исследования. Изучение ионных механизмов регуляции сократительной активности сосудистых гладких мышц и мембранного потенциала эритроцитов у спонтанно-гипертензивных крыс.Материалы и методы. Механографическим методом исследовано действие ацетилхолина (АЦХ), 10 мкМ, и Са2+-ионофора A23187, 10 мкМ, на контрактильные реакции изолированных гладкомышечных сегментов аорты 11-недельных спонтанно-гипертензивных крыс (spontaneously hypertensive rats, SHR) и крыс Wistar – Kyoto (WKY), индуцированные фенилэфрином (ФЭ), 1 мкМ. Крысы SHR были разделены на контрольную и экспериментальные группы в зависимости от типа получаемого лечения (амлодипин 10 мг/кг внутрижелудочно). У крыс SHR измеряли артериальное давление (АД) до и после лечения. Потенциометрическим методом оценивали величину гиперполяризационного ответа (ГО) и активность Са2+-зависимых К+-каналов мембраны эритроцитов крыс SHR. Результаты. В ответ на стимулирующее воздействие АЦХ и кальциевого ионофора А23187 происходило расслабление гладкомышечных сегментов аорты крыс WKY и SHR, предсокращенных адреномиметиком ФЭ. На добавление АЦХ сосудистые сегменты крыс SHR отвечали большей дилатацией, чем сегменты крыс WKY, но подобной тенденции не наблюдалось при действии Ca2+-ионофора. Внутрижелудочное введение крысам SHR блокатора Са2+-каналов L-типа амлодипина вызывало как снижение АД, так и значимое усиление расслабляющего действия холиномиметика и Са2+-ионофора на интактные сегменты аорты. У крыс SHR отмечено повышение амплитуды ГО активности Са2+-зависимых К+-каналов мембраны эритроцитов.Заключение. Дилатационные реакции сосудистых гладких мышц крыс SHR обусловлены изменением эндотелиальной функции и Са2+-зависимой ионной проводимости мембраны миоцитов. Увеличение гиперполяризации мембраны эритроцитов крыс со спонтанной гипертензией связано с активацией калиевых каналов. Селективное воздействие на данные внутриклеточные мишени может служить основой для разработки антигипертензивных препаратов

HYPERVISCOSITY SYNDROME IN ARTERIAL HYPERTENSION AND HEMORHEOLOGICAL EFFECTS OF ANTIHYPERTENSIVE DRUGS

Current study briefly shows the pathological changes of blood rheological properties in arterial hypertension and the impact of main rheological parameters is discussed (hematocrit, plasma viscosity, aggregation, erythrocyte deformity) on the development of blood hyperviscosity syndrome. The data is provided on the influence of antihypertension drugs (angiotensin converting enzyme inhibitors, calcium channel antagonists, andrenoblockers, diuretics and angiotensin II receptor blockers) on blood rheology in patients with arterial hypertension

Dynamics of blood pressure elevation and endothelial dysfunction in SHR rats during the development of arterial hypertension

The dynamics of systolic and diastolic BP and vasodilatory activity of the endothelium in SHR and Wistar-Kyoto rats was studied from the 5th to the 12th week of life. Systolic and diastolic BP did not differ in 5-week-old SHR and Wistar-Kyoto rats. After the 6th week of life, two stages of arterial hypertension development were observed in SHR. Stage 1 (weeks 6-8) was characterized by a significant increase in systolic and diastolic BP that exceeded the corresponding parameters in Wistar-Kyoto rats by 26-32%. Vasodilatory activity of the endothelium was similar in rats of both strains at the age of 5-7 weeks. Stage 2 (weeks 9-12) in SHR rats was characterized by further increase in systolic and diastolic BP that exceeded the corresponding parameters in Wistar-Kyoto rats by 54-89%. The increase in BP during this period was accompanied by a significant decrease in endothelium-dependent relaxation (by 14-16% compared to that in Wistar-Kyoto rats of the same age)

Dynamics of blood pressure elevation and endothelial dysfunction in SHR rats during the development of arterial hypertension

The dynamics of systolic and diastolic BP and vasodilatory activity of the endothelium in SHR and Wistar-Kyoto rats was studied from the 5th to the 12th week of life. Systolic and diastolic BP did not differ in 5-week-old SHR and Wistar-Kyoto rats. After the 6th week of life, two stages of arterial hypertension development were observed in SHR. Stage 1 (weeks 6-8) was characterized by a significant increase in systolic and diastolic BP that exceeded the corresponding parameters in Wistar-Kyoto rats by 26-32%. Vasodilatory activity of the endothelium was similar in rats of both strains at the age of 5-7 weeks. Stage 2 (weeks 9-12) in SHR rats was characterized by further increase in systolic and diastolic BP that exceeded the corresponding parameters in Wistar-Kyoto rats by 54-89%. The increase in BP during this period was accompanied by a significant decrease in endothelium-dependent relaxation (by 14-16% compared to that in Wistar-Kyoto rats of the same age)

Effect of Phosphorus Precursor, Reduction Temperature, and Support on the Catalytic Properties of Nickel Phosphide Catalysts in Continuous-Flow Reductive Amination of Ethyl Levulinate

Levulinic acid and its esters (e.g., ethyl levulinate, EL) are platform chemicals derived from biomass feedstocks that can be converted to a variety of valuable compounds. Reductive amination of levulinates with primary amines and H2 over heterogeneous catalysts is an attractive method for the synthesis of N-alkyl-5-methyl-2-pyrrolidones, which are an environmentally friendly alternative to the common solvent N-methyl-2-pyrrolidone (NMP). In the present work, the catalytic properties of the different nickel phosphide catalysts supported on SiO2 and Al2O3 were studied in a reductive amination of EL with n-hexylamine to N-hexyl-5-methyl-2-pyrrolidone (HMP) in a flow reactor. The influence of the phosphorus precursor, reduction temperature, reactant ratio, and addition of acidic diluters on the catalyst performance was investigated. The Ni2P/SiO2 catalyst prepared using (NH4)2HPO4 and reduced at 600 °C provides the highest HMP yield, which reaches 98%. Although the presence of acid sites and a sufficient hydrogenating ability are important factors determining the pyrrolidone yield, the selectivity also depends on the specific features of EL adsorption on active catalytic sites

Synergetic Effect of Ni2P/SiO2 and γ-Al2O3 Physical Mixture in Hydrodeoxygenation of Methyl Palmitate

The Ni2P/SiO2 catalyst, which was prepared by in situ temperature-programmed reduction and in the mixture with the inert (SiC, SiO2) or acidic (γ-Al2O3) material was studied in methyl palmitate hydrodeoxygenation (HDO). Methyl palmitate HDO was carried out at temperatures of 270–330 °C, H2/feed volume ratio of 600 Nm3/m3, and H2 pressure of 3.0 MPa. Ni2P/SiO2 catalyst, diluted with γ-Al2O3 showed a higher activity than Ni2P/SiO2 catalyst diluted with SiC or SiO2. The conversion of methyl palmitate increased significantly in the presence of γ-Al2O3 most probably due to the acceleration of the acid-catalyzed reaction of ester hydrolysis. The synergism of Ni2P/SiO2 and γ-Al2O3 in methyl palmitate HDO can be explained by the cooperation of the metal sites of Ni2P/SiO2 and the acid sites of γ-Al2O3 in consecutive metal-catalyzed and acid-catalyzed reactions of HDO. The obtained results let us conclude that the balancing of metal and acid sites plays an important role in the development of the efficient catalyst for the HDO of fatty acid esters over supported phosphide catalysts

Features of ionic transport processes in a model of arterial hypertension

Aim. To study the ionic mechanisms which underlie regulation contractile activity of vascular smooth muscles and the erythrocytes membrane potential from spontaneously hypertensive rats.Materials and methods. The effect of acetylcholine (ACX), 10 μM, and Ca2+ -ionophore A23187, 10 μM, on the contractile reactions of isolated smooth muscle segments of the aorta from 11-week-old spontaneously hypertensive rats (SHR) and Wistar – Kyoto rats (WKY) induced by phenylephrine (PE), 1 μM, was measured by the mechanography. 11-week-old SHR were divided into control and experimental groups depending on the drug administration (amlodipine 10 mg/kg given intragastrically). Blood pressure (BP) in SHR was measured before and after treatment. The amplitude of the hyperpolarizating response (HO) and the activity of Ca2+-dependent K+-channels of the erythrocyte membrane of SHR were performed with potentiometric method.Results. In response to the stimulating effect of the ACX or the calcium ionophore A23187, the smooth muscle segments of the aorta from the WKY and SHR precontracted with PE were relaxed. To the addition of the ACX, the vascular segments of the SHR responded with a stronger dilatation than the WKY segments, but not the action of the Ca2+-ionophore. Treatment of SHR with blocker of Ca2+-channels of L-type amlodipine caused a decrease the BP, and an increase in the relaxing effect of intact aortic segments on the ACX and Ca2+-ionophore. There was an increase the amplitude of HO and activity of Ca2+-dependent K+-channels of the erythrocyte membrane from SHR.Conclusion. Relaxation of vascular smooth muscle in SHR is caused by changes in the endothelial function and Ca2+-dependent ionic conductivity of the myocyte membrane. An increase of the hyperpolarizating response of the erythrocyte membrane from rats with spontaneous hypertension is associated with activation of potassium channels. The selective effect on these intracellular targets can serve as a basis for the development of antihypertensive drugs

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

Two sets of silica-supported nickel phosphide catalysts with a nickel content of about 2.5 and 10 wt % and Ni/P molar ratio 2/1, 1/1 and 1/2 in each set, were prepared by way of a temperature-programmed reduction method using (Ni(CH3COO)2) and ((NH4)2HPO4) as a precursor. The NixPy/SiO2 catalysts were characterized using chemical analysis N2 physisorption, XRD, TEM, 31P MAS NMR. Methyl palmitate hydrodeoxygenation (HDO) was performed in a trickle-bed reactor at 3 MPa and 290 °C with LHSV ranging from 0.3 to 16 h−1. The Ni/P ratio was found to affect the nickel phosphide phase composition, POx groups content and catalytic properties in methyl palmitate HDO with the TOF increased along with a decline of Ni/P ratio and a growth of POx groups’ content. Taking into account the possible routes of methyl palmitate conversion (metal-catalyzed hydrogenolysis or acid-catalyzed hydrolysis), we proposed that the enhancement of acid POx groups’ content with the Ni/P ratio decrease provides an enhancement of the rate of methyl palmitate conversion through the acceleration of acid-catalyzed hydrolysis