Crystal growth,layered structure and luminescence properties of K2Eu(PO4)(WO4)

K₂Eu(PO₄)(WO₄) has been prepared via the high-temperature solution growth (HTSG) method using K₂WO₄–KPO₃ molten salts as a self-flux and characterized by single-crystal X-ray diffraction analysis, IR and luminescence spectroscopy. The structure of this new compound features a 2D framework containing [EuPO₆]⁴⁻ layers, which are composed of zigzag chains of [EuO₈]_n interlinked by slightly distorted PO₄ tetrahedra. Isolated WO₄ tetrahedra are attached above and below these layers, leaving space for the K⁺ counter-cations. The photoluminescence (PL) characteristics (spectra, line intensity distribution and decay kinetics) confirm structural data concerning one distinct position for europium ions. The luminescence color coordinates suggest K₂Eu(PO₄)(WO₄) as an efficient red phosphor for lighting applications.

K₂Eu(PO₄)(WO₄) has been prepared via the high-temperature solution growth (HTSG) method using K₂WO₄–KPO₃ molten salts as a self-flux and characterized by single-crystal X-ray diffraction analysis, IR and luminescence spectroscopy.     

Renal and uterine hemodynamics in pregnant women with hypertension]

AIM: To study gestational alterations of renal and uterine hemodynamics, their relationships with systemic and intracardiac hemodynamics in pregnant women (PW) with essential hypertension (EH). MATERIAL AND METHODS: Echocardiography, ultrasound dopplerography of renal and uterine arteries, roll-over test were made in the course of trimester II-III and 3 months after the delivery in 48 PW with EH degree 1-2 and control 20 healthy PW. Hemodynamic parameters in pregnancy were compared to postpartum ones. The latter were supposed to be basal. RESULTS: Changes in systemic and intracardiac hemodynamics in EH and control women were in many respects similar but systolic blood pressure in EH changed insignificantly, minute volume increased owing to increased heart rate. PW with EH of the second degree have in the III trimester more frequent positive roll-over test this evidencing for high pressor reactivity of the vascular system. PW with EH showed higher speed of the blood flow in the renal arteries in unchanged resistance. With growing gestation time the resistance of the uterine arteries declined. The resistance of the main stem of the renal artery went up in enhanced cardiac contraction regardless of total peripheral vascular resistance (TPVR). Blood flow in the uterine arteries worsened in elevation of arterial pressure, TPVR, lowering of the heart rate and systolic function of the heart. Renal and uterine hemodynamics were independent. CONCLUSION: Hemodynamic changes in control and EH PW were similar in many respects but higher arterial pressure, abnormal systolic function of the left ventricle, bradycardia disturb uterine blood flow. Renal circulation was independent of systemic and intracardiac hemodynamics and is unrelated to changes in the uterine circulation.     

Renal and uterine hemodynamics in pregnancy with chronic glomerulonephritis of the hypertonic type

AIM: To study gestational changes in renal and uterine hemodynamics and their relation to systemic and intracardiac hemodynamics in pregnant hypertensive women with chronic glomerulonephritis (CGN). MATERIAL AND METHODS: Echocardiography, ultrasonic dopplerography of renal and uterine arteries were made in 16 pregnant women with CGN and AH syndrome in trimester II-III and 1-3 months after the delivery. Hemodynamic indices in pregnancy were compared to those after the delivery which were considered baseline. RESULTS: In CGN pregnant women with AH syndrome resistance of renal arteries did not change in pregnancy and were similar postpartum. With advancing pregnancy, the resistance of the uterine arteries diminished. The indices of the resistance in the main trunk of the renal artery correlated with volumetric cardiohemodynamic indices, heart rate and total peripheral resistance in segmental interlobular arteries. No significant correlation were found between uterine, systemic and cardiac hemodynamics though it existed between renal and uterine blood flow. CONCLUSION: Pregnancy does not affect vascular resistance of renal arteries in CGN pregnant women with AH syndrome, but contrary to pregnancy with essential hypertension in that with CGN and AH syndrome renal circulation responds to changes in systemic hemodynamics and volumetric indices of cardiohemodynamics. These findigns may reflect disturbances in autoregulation of renal circulation and additional effects on pregnancy outcome in women with CGN and AH syndrome.     

Methodological problems and various results of the study of the incidence and structure of diseases of the urinary system among adult population (data from outpatient clinics of Moscow, Celinograd and the Celinograd district of the Kazakh SSR)

A 4-stage system of mass screening of population for the detection of renal diseases tested in one of the outpatient clinic zones in Moscow (2013 residents), Thelinograd (7091 residents), and Tselinograd Region, Kazakh SSR (880 residents) was presented. The incidence rates of renal diseases per 1000 examined population in Moscow, Tselinograd and Thelinograd Region, Kazakh SSR, were 12.4 +/- 2.5, 10.4 +/- 1.2, 13.6 +/- 3.9, respectively.