We report on the comprehensive experimental and theoretical studies of magnetic and electronic structural properties of the Gd0.4Tb0.6Co2 compound crystallization in the cubic Laves phase (C15). We present new results and compare them to those reported earlier. The magnetic study was completed with electronic structure investigations. Based on magnetic isotherms, magnetic entropy change (ΔSM) was determined for many values of the magnetic field change (Δμ0H), which varied from 0.1 to 7 T. In each case, the ΔSM had a maximum around room temperature. The analysis of Arrott plots supplemented by a study of temperature dependency of Landau coefficients revealed that the compound undergoes a magnetic phase transition of the second type. From the M(T) dependency, the exchange integrals between rare-earth R-R (JRR), R-Co (JRCo), and Co-Co (JCoCo) atoms were evaluated within the mean-field theory approach. The electronic structure was determined using the X-ray photoelectron spectroscopy (XPS) method as well as by calculations using the density functional theory (DFT) based Full Potential Linearized Augmented Plane Waves (FP-LAPW) method. The comparison of results of ab initio calculations with the experimental data indicates that near TC the XPS spectrum collects excitations of electrons from Co3d states with different values of exchange splitting. The values of the magnetic moment on Co atoms determined from magnetic measurements, estimated from the XPS spectra, and results from ab initio calculations are quantitatively consistent. 相似文献
The aim of the study was to determine the prevalence of Echinococcus multilocularis in red foxes (Vulpes vulpes) in Poland. Overall, 1,546 intestinal samples from 15 of the 16 provinces in Poland were examined by the sedimentation and counting technique (SCT). The mean prevalence of E. multilocularis in Poland was 16.5 % and was found in 14 of the 15 examined provinces. The mean intensity of infection was 2,807 tapeworms per intestine. Distinct differences in prevalence were observed between regions. In some provinces of eastern and southern Poland, the level of prevalence was 50.0 % (Warmińsko-Mazurskie), 47.2 % (Podkarpackie), 30.4 % (Podlaskie) and 28.6 % (Ma?opolskie), while in other provinces (west and south-west), only a few percent was found: 2.0 % (Dolno?l?skie), 2.5 % (Wielkopolskie) and 0.0 % (in Opolskie). The border between areas with higher and lower prevalence seems to coincide with a north–south line running through the middle of Poland, with prevalence from 17.5 to 50.0 % in the eastern half and from 0.0 to 11.8 % in the western half. The dynamic situation observed in the prevalence of this tapeworm indicated the necessity of continuing to monitor the situation concerning E. multilocularis in red foxes in Poland. 相似文献
Polysulfone‐based membranes with excellent chemical resistance and a wet thickness up to 200 μm are obtained via UV curing of unmodified polymers after careful tuning of the photoinitiating system and the crosslinker structure. Combinations of photoinitiator and crosslinker are studied in depth, followed by a characterization of the formed macromolecular structure. The performance of the resulting membranes is then evaluated through long‐term immersion in solvents. Classical depth‐curing acyl phosphine oxide‐based photoinitiators in combination with a pentaacrylate crosslinker are found to be the optimal system.
BackgroundSynthetic cathinones (SCs) form one of the most prominent group of the New Psychoactive Substances. SCs enhance central dopaminergic and noradrenergic neurotransmission, and are used as substitutes for illicit psychostimulants, namely cocaine, amphetamine, and methamphetamine. Changes in the expression of immediate early genes (IEGs) in the striatum underlie the addictive potential of drugs of abuse belonging to distinct pharmacologic groups. This work was aimed to assess the impact of acute administration of the prominent SCs on the mRNA levels of IEGs in the mouse striatum.MethodsEffects of 3,4-MDPV, 2,3-MDPV, α-PVP, PV8, PV9, methcathinone (MC) and 3-fluoromethcathinone (3-FMC) on the mRNA levels of ten IEGs, one and two hours after exposure, were measured in the mouse striatum using the quantitative RT-PCR technique.ResultsAll SCs used in the study produced increased mRNA levels of the following IEGs: Areg, c-fos, Csrnp1, Dusp1, Dusp14, Egr2, Egr4 and FosB. Additionally, the majority of SCs increased the expression of Homer1 and c-jun. The magnitude of observed changes varied by the drug, analyzed gene and, in many cases, by time after administration.ConclusionsThis study demonstrates that SCs increase the expression of IEGs in the mouse striatum, which may lead to a plethora of effects, as proteins encoded by the analyzed genes are involved in diverse actions, including an acute response to the drug and the neuroplasticity underlying the development of addiction. 相似文献
We present a case of the left atrial myxoma 6 years after atrial fibrillation ablation. The initial diagnosis of the mass revealed on echocardiography was a thrombus. Failure of anticoagulant treatment and transesophageal echocardiography led to diagnosis of myxoma, confirmed intraoperatively and histologically. 相似文献
Patent foramen ovale (PFO) is the most common cause of right-to-left shunt which carries a significant risk for stroke when associated with venous thrombosis, coagulation abnormalities or other conditions. We present a young male in whom diving was associated with stroke in a subject with otherwise clinically silent PFO. 相似文献
We present a case of 44 year-old female who was admitted to the hospital due to performed radio frequency ablation because of VF during WPW syndrome, which was complicated by dissection of left main. The dissection was treated with success by primary percutaneous coronary intervention with two metal stents. 相似文献
In presented case rotational angiography with three dimensional reconstruction (3DRA) was used for diagnostic and control angiograms during covered CP stent implantation in patient with critical aortic coarctation and patent ductus arteriosus. Administering less contrast then for standard two perpendicular projections, good quality images were obtained in at least seven projections. 相似文献
Ovarian hormones modulate the metabolism of adipose cells and present a protective effect against hypertension. The aim of this study was to compare the effect of estradiol on adiposity markers in spontaneously hypertensive rats. Ovariectomized spontaneously hypertensive rats treated with estradiol (5 μg/100 g/day), three weeks after ovariectomy, presented decreased blood pressure and insulin levels and increased hepatic glycogen content. Periuterine or mesenteric adipocytes from treated animals were smaller as compared to vehicle treated group, whereas no differences were observed in relation to the number of cells. Basal rates of glycerol release were higher only in periuterine adipocytes of treated rats. The increment of glycerol release over basal values in response to isoproterenol was 400% and 440%, 283% and 330% for vehicle and estradiol treated periuterine and mesenteric adipocytes, respectively. The estradiol treated group was more sensitive to insulin inhibition of isoproterenol-stimulated lipolysis than the control animals. The lipoprotein lipase activity decreased after treatment, only in periuterine adipose tissue. Estradiol administration increased basal and insulin-stimulated rates of glucose transport in adipocytes of both sites, although the values obtained by periuterine were higher than those observed for mesenteric adipocytes. Both adipose tissues from treated animals exhibited a decreased expression of the peroxisome proliferator-activated receptor-γ, but an increased expression of peroxisome proliferator-activated receptor-α in liver. These findings suggest that estrogen administration attenuates adiposity markers of spontaneously hypertensive rats as a result of the decreased expression levels of peroxisome proliferator-activated receptor-γ in adipose tissue and increased expression of peroxisome proliferator-activated receptor-α in liver. 相似文献