Enhanced photocatalytic activity of a visible-light-driven ternary WO3/Ag/Ag3PO4 heterojunction: a discussion on electron transfer mechanisms

WO₃/Ag₃PO₄ with different weight ratios were prepared by ultrasonic assisted two-step deposition method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectroscopy (PL) and transmission electron microscopy (TEM). The photocatalytic activities of all samples were evaluated by the degradation of rhodamine B (RhB) under visible light irradiation. WA-60 shows the highest photocatalytic activity in the WA-x series composite, while the photocatalytic activity of WAA-60 is the best among all samples. The free radical trapping experiments show that photogenerated holes (h⁺) are the main active species. The Ag nanoparticles produced by the decomposition of Ag₃PO₄ are located at the interface of Ag₃PO₄/WO₃, which promotes the separation efficiency of photogenerated electrons and holes. To further explain the photocatalytic mechanism, electrochemical and physical tests are introduced to explore the flow of electrons inside the catalyst.

WO₃/Ag₃PO₄ with different weight ratios were prepared by ultrasonic assisted two-step deposition method.     

DSA下经皮带膜支架腔内隔绝术治疗Stanford B型主动脉夹层的临床价值

目的：探讨数字减影血管造影（DSA）下经皮带膜支架腔内隔绝术（EVGE）治疗Stanford B型主动脉夹层（AD）的临床价值。 方法：选取2015年1月至2017年12月在我院行EVGE治疗的Stanford B型AD患者30例,其中15例于DSA下经皮穿刺联合放置血管缝合器行EVGE治疗,为观察组;15例行传统（切开股动脉）行EVGE治疗,为对照组;比较两组的手术成功率、术中出血量、引流时间、住院时间和局部血管并发症发生率;比较两组术后随访3个月的手术部位血管直径、生活质量评分及支架移位情况。 结果：两组的手术成功率差异无统计学意义（93.3% vs. 100.0%,χ²=1.03,P>0.05）,观察组的术中出血量低于对照组[（43.57±14.30）ml vs.（69.82±25.18）ml],差异有统计学意义（t=3.51,P<0.05）。观察组术后引流时间[（2.63±1.07）d vs.（3.87±1.25）d]和住院时间[（5.47±1.85）d vs.（7.65±2.24）d]均短于对照组,差异有统计学意义（t=2.91、2.90,P均<0.05）。局部血管并发症总发生率低于对照组（6.67% vs. 40.0%）,差异有统计学意义（χ²=4.90,P<0.05）。经过3个月随访,观察组术后生活质量评分高于对照组[（92.54±13.52）vs.（83.25±14.05）],差异有统计学意义（t=1.84,P<0.05）。两组术后血管直径差异无统计学意义（P>0.05）。且支架未出现移位情况。 结论：在DSA下进行EVGE带膜支架治疗Stanford B型AD患者,可有效保证患者的成功率和预后,减少术中出血和术后局部血管并发症发生率,并加速术后恢复。     

Postmortem diagnosis of fatal hypothermia/hyperthermia by spectrochemical analysis of plasma

Postmortem diagnosis of extreme-weather-related deaths is a challenging forensic task. Here, we present a state-of-the-art study that employed attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy in combination with Chemometrics for postmortem diagnosis of fatal hypothermia/hyperthermia by biochemical investigation of plasma in rats. The results of principal component analysis (PCA) and spectral analysis revealed that plasma samples from the fatal hypothermia, fatal hyperthermia, and control groups, are substantially different from each other based on the spectral variations associated with the lipid, carbohydrate and nucleic acid components. Two partial least squares-discriminant analysis (PLS-DA) classification models (hypothermia-nonhypothermia and hyperthermia-nonhyperthermia binary models) with a 100% accuracy rate were constructed. Subsequently, internal cross-validation was performed to assess the robustness of these two models, which resulted in 98.1 and 100% accuracy. Ultimately, classification predictions of 42 unknown plasma samples were performed by these two models, and both models achieved 100% accuracy. Additionally, our results demonstrated that hemolysis and postmortem hypothermic/hyperthermic effects did not weaken the prediction ability of these two classification models. In summary, this work demonstrates ATR-FTIR spectroscopy’s great potential for postmortem diagnosis of fatal hypothermia/hyperthermia.