PAI-1和FV基因多态性与静脉血栓的临床意义

目的 一种新技术检测静脉血栓相关基因纤溶酶原激活物抑制剂-1(PAI-1)和凝血因子V(FV)基因多态性,分析清远地区人群基因频率分布情况,指导静脉血栓临床药物治疗。方法 提取2020年4月至2021年8月在清远市人民医院行静脉血栓基因检测的2 281例患者DNA,应用数字荧光分子杂交法检测PAI-1和FV基因多态性,并进行Sanger测序加以验证,大数据分析清远市人民医院就诊患者基因型分布频率,评估男、女性和心、脑血管疾病、肿瘤患者PAI-1和FV基因是否突变与发生静脉血栓的风险,指导抗血栓药物使用。结果 数字荧光分子杂交与Sanger测序结果完全符合(100%);大数据发现本地区人群PAI-1基因呈多态性分布(19.33%、50.33%、30.34%),而FV基因型突变极少,多为野生纯合型(99.91%);PAI-1和FV基因型频率和等位基因频率在男、女性和心、脑血管疾病、肿瘤患者人群中差异无统计学意义(P均>0.05);PAI-1基因多态性与疾病进程无明显相关性。结论 PAI-1基因检测对静脉血栓药物应用极具临床意义,可实现精准化个体治疗,但PAI-1基因多态性与其他疾病和性别无关。

活血化瘀药对不稳定型心绞痛患者PAI-1、t-PA影响的Meta分析

目的探讨活血化瘀药对不稳定型心绞痛(Unstable angina,UA)患者纤溶酶原激活物抑制物(Plasminogen activator inhibitor-1,PAI-1)、组织型纤溶酶原激活剂(Tissue-type plasminogen activator,t-PA)水平的影响,进而评价活血化瘀药对不稳定型心绞痛患者临床疗效,从而为临床预防治疗不稳定型心绞痛提供依据。方法通过检索PubMed、EMbase、The Cochrane Library、Web of Science、ClinicalTrials.gov、万方数据和中国知网数据库,收集活血化瘀药联合西医常规治疗UA的随机对照试验(RCT)文献,采用RevMan 5.4软件进行Meta分析。结果共纳入22项研究,涉及1998例研究对象。Meta分析结果显示,与西药相比,联用活血化瘀中药可以进一步降低UA患者血清PAI-1水平[SMD=-1.96,95%CI(-2.50,-1.43)],Z=7.18,P<0.00001,升高UA患者t-PA水平[SMD=0.55,95%CI(0.41,0.69)],Z=7.85,P<0.00001。结论与常规西药治疗相比,联用活血化瘀药可进一步降低UA患者体内PAI-1水平、升高t-PA水平,改善患者纤溶活性。

妊娠期高血压患者血清TGF-β1、PLGF、PAI-1水平与病情程度及妊娠结局的关系

目的:探讨妊娠期高血压(HDCP)患者血清转化生长因子β1(TGF-β1)、胎盘生长因子(PLGF)、纤溶酶原激活物抑制剂-1(PAI-1)水平与病情程度及妊娠结局的关系。方法:将90例HDCP单胎孕妇作为研究对象,根据病情程度将其分为妊娠期高血压组(n=30)、轻度子痫前期组(n=30)和重度子痫前期组(n=30);另选同期30例正常单胎妊娠孕妇作为对照组。采用酶联免疫吸附法测定血清TGF-β1、PLGF和PAI-1水平,分析血清TGF-β1、PLGF和PAI-1与病情程度的相关性及其对妊娠结局的预测价值。结果:重度子痫前期组血清TGF-β1、PAI-1水平最高,其次为轻度子痫前期组、妊娠期高血压组,对照组最低(P<0.001);重度子痫前期组血清PLGF水平最低,其次为轻度子痫前期组、妊娠期高血压组,对照组最高(P<0.001)。血清TGF-β1、PAI-1与HDCP病情程度均呈正相关关系(P<0.001),血清PLGF与HDCP病情程度负相关(P<0.001)。妊娠结局统计显示,90例HDCP患者中,妊娠结局良好者53例,妊娠结局不良者37例。与妊娠结局良好组比较,妊娠结局不良组舒张压、收缩压、TGF-β1和PAI-1水平均升高(P<0.001),PLGF水平降低(P<0.001)。多因素Logistic回归分析显示,TGF-β1、PLGF和PAI-1的OR值分别为1.716、1.670、1.429,均是HDCP患者不良妊娠结局的独立危险因素(P<0.05)。ROC曲线分析显示,TGF-β1、PLGF和PAI-1及三者联合预测妊娠结局的曲线下面积分别为0.834、0.918、0.835、0.981,以三者联合预测价值最高。结论:血清TGF-β1、PLGF和PAI-1水平与HDCP病情程度及妊娠结局密切相关,有助于预测不良妊娠结局的风险,并为HDCP个体化治疗提供新的线索和可能性。

Experimental and numerical study regarding H-steel all-bolted connection steel frame with composite wall boards

H-steel all-bolted connection steel frame structures with heat preservation and decoration composite wall boards were investigated and the seismic performances of three scaled specimens were studied.The failure modes,hysteresis curves,bearing capacity,ductility,energy dissipation capacity,stiffness degradation and strain distribution were discussed.The calculation method of structural theoretical internal force was presented.The results showed that the overall structural seismic performance was better,and the structural ductility met the demands of elastic-plastic inter-story drift angle for seismic design.The H-steel weak-axis connection structure obtained better energy dissipation capacity,and its bearing capacity and stiffness were slightly different from the strong-axis connection.The heat preservation and decoration performance of composite wallboard and the all-bolted connection of the steel frame realized prefabrication during the whole construction period.The plastic hinge of the steel beam can be moved outwards because of the L-angles,which effectively avoids stress concentration in joint areas and expands the plastic hinge range.The errors between the theoretical structural capacity calculated by the plastic analysis method and the test results were within 2.44%.In addition,structural failure mechanisms and bearing capacities were verified by the finite element(FE)analysis,and the effects of the main parameters on the structures were investigated.The FE verification results were the same as in the test.The research results provide theoretical support and technical guidance for the application of thermal insulation and decorative composite wall panels in H-shaped steel all-bolted steel frames.

Distribution behavior of valuable elements in oxygen-enriched top-blown smelting process of waste printed circuit boards

Oxygen-enriched top-blown smelting is a promising technology for processing waste printed circuit boards(WPCBs).The distribution behavior of valuable elements in WPCBs during smelting was investigated by varying the oxygen-enriched concentration,oxygen volume,CaO/SiO_(2)(mass ratio),and Fe/SiO_(2)(mass ratio).The optimal operating conditions were obtained by implementing a one-factor-at-a-time method.X-ray diffractometer,scanning electron microscopy−energy dispersive spectrometer,and inductive coupled plasma-atomic emission spectroscopy methods were utilized to detect the chemical composition,occurrence state as well as elemental contents of alloy and slag.It is found that the elements of Cu,Sn and Ni are mainly accumulated in the alloy while Fe is mainly oxidized into the slag.The direct yields of Cu,Sn and Ni are 90.18%,85.32%and 81.10%under the optimal conditions of temperature 1250℃,oxygen-enriched concentration 30%,oxygen volume 24 L,CaO/SiO_(2) mass ratio 0.55,and Fe/SiO_(2) mass ratio 1.05.The results show that the valuable metals are mainly lost in the slag through mechanical entrainment.

Effect of copper content on the pyrolysis process of organic components in waste printed circuit boards:Based on experimental and quantum chemical DFT simulations

In recent years,scientists have become increasingly concerned in recycling electronic trash,particularly waste printed circuit boards(WPCBs).Previous research has indicated that the presence of Cu impacts the pyrolysis of WPCBs.However,there may be errors in the experimental results,as printed circuit boards(PCBs)with copper and those without copper are produced differently.For this experiment,we blended copper powder with PCB nonmetallic resin powder in various ratios to create the samples.The apparent kinetics and pyrolysis properties of four resin powders with varying copper concentrations were compared using nonisothermal thermogravimetric analysis(TG)and thermal pyrolysis-gas chromatography mass spectrometry(Py-GC/MS).From the perspective of kinetics,the apparent activation energy of the resin powder in the pyrolysis reaction shows a rise(0.1<a<0.2)-stable(0.2<a<0.4)-accelerated increase(0.4<a<0.8)-decrease(0.8<a<0.9)process.After adding copper powder,the apparent activation energy changes more obviously when(0.2<a<0.4).In the early stage of the pyrolysis reaction(0.1<a<0.6),the apparent activation energy is reduced,but when a?0.8,it is much higher than that of the resin sample without copper.Additionally,it is discovered using thermogravimetric analysis and Py-GC/MS that copper shortens the temperature range of the primary pyrolysis reaction and prevents the creation of compounds containing bromine.This inhibition will raise the temperature at which compounds containing bromine first form,and it will keep rising as the copper level rises.The majority of the circuit board molecules have lower bond energies when copper is present,according to calculations performed using the Gaussian09 software,which promotes the pyrolysis reaction.

Effect of Low pH on Forming Process of Desulfurization Gypsum Composite Boards Strengthened by Melamine-formaldehyde Resin

Through exploring the effects of low pH on the composite system of desulfurization gypsum(DG)enhanced by melamine-formaldehyde resin(MF),it is found that the inducing of sulfate-ion,in contrast to chloride and oxalate ions,favors the longitudinal growth of the crystalline form of the hydration product,which was relatively simple and had the highest length to width(L/D)ratio.At the same time,MF can also improve L/D ratio of gypsum hydration products,which favors the formation of hydrated whiskers.Finally,in a composite system composed of hemihydrate gypsum,MF,and glass fibers,when dilute sulfuric acid was used to regulate pH=3-4,the tight binding formed among the components of the composite system compared to pH=5-6.The hydration product of gypsum adheres tightly to glass fiber surface and produces a good cross-linking and binding effect with MF.The flexural strength,compressive strength,elastic modulus,and water absorption of the desulphurized gypsum composite board is 22.7 MPa,39.8 MPa,5608 MPa,and 1.8%,respectively.

Protective benefits of HDPE board sand fences in an environment with variable wind directions on Gobi surfaces:wind tunnel study

The Golmud-Korla Railway in the Gobi area faces operational challenges due to sand hazards,caused by strong and variable winds.This study addresses these challenges by conducting wind tunnel tests to evaluate the protective benefits of High Density Polyethylene(HDPE)board sand fences,focusing on their orientation relative to various wind directions(referred to as'wind angle').This study found that the size of the low-velocity zone on the leeward side of the sand fences(LSF)expanded with an increase in the wind angle(WA).At 1H(the height of the sand fence)and 2H positions on the LSF,the wind speed profiles(WSP)exhibited a segmented logarithmic growth,constrained by Z=H at varying WAs.The efficacy of the sand fence in obstructing airflow escalated as WA increased.The size of the WA has a significant impact on the protective efficiency of HDPE board sand fences.Furthermore,compared to typical sandy surfaces,the rate of sand transport across the Gobi surface diminishes more slowly with height,attributed to the gravel's rebound effect.This phenomenon allows some sand particles to bypass the fences,rendering them less effective at blocking wind and trapping sand than in sandy environments.This paper offers scientific evidence supporting the practical use and enhancement of HDPE board sand fences in varied wind conditions.

Protective benefit of folded linear HDPE board sand fences along the Golmud-Korla Railway,China:Field observation and wind tunnel study

The Milan Gobi area of the Golmud-Korla Railway in northwest China is located in the lower dispersal area of the mountain pass and has strong winds with evident double wind direction characteristics.This study introduced a novel sand fence deployment technique,termed‘folded linear deployment',designed to position the sand fence orthogonally to the two predominant wind directions for optimal protection.This study used wind tunnel and field tests to evaluate the wind and sand flow characteristics,as well as the windproof and sandresistant performance of folded linear HDPE(Highdensity polyethylene)board sand fences.The results suggest that the airflow around the fence creates clear zoning characteristics.The deceleration area on the BSF(backwind side of the sand fence)is much larger than that on the DSF(downwind side of the sand fence).Thus,sand particles are primarily deposited on the BSF.At different wind speeds,the airflow at 2 and 5 h on the DSF is not disturbed.The WSP(wind speed profile)presents a logarithmic distribution.The airflow is disturbed at 1-20 h on the BSF,and the WSP gradually deviates from the logarithmic law.However,as the airflow moves away from the fence,the WSP gradually approaches a logarithmic distribution.Meanwhile,the WPE(windproof efficiency)and SRE(sand-resistant efficiency)of the sand fence exceed 80%.In addition,the results of wind tunnel tests are compared with those of field tests.The overall dispersion is good,and the best dispersion is found at z/H=2.00,indicating good agreement between the two test results.This study provides a scientific basis for the design of sand hazard control measures,similar to the railway project in the Gobi Gale area.

A Single-Board Integrated Millimeter-Wave Asymmetric Full-Digital Beamforming Array for B5G/6G Applications

In this article,a single-board integrated millimeter-wave(mm-Wave)asymmetric full-digital beamforming(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)communications.The proposed integrated array effectively addresses the challenge of arranging a large number of ports in a full-digital array by designing vertical connections in a three-dimensional space and successfully integrating full-digital transmitting(Tx)and receiving(Rx)arrays independently in a single board.Unlike the traditional symmetric array,the proposed asymmetric array is composed of an 8×8 Tx array arranged in a square shape and an 8+8 Rx array arranged in an L shape.The center-to-center distance between two adjacent elements is 0.54k0 for both the Tx and Rx arrays,where k0 is the free-space wavelength at 27 GHz.The proposed AFDBF array possesses a more compact structure and lower system hardware cost and power consumption compared with conventional brick-type full-digital arrays.In addition,the energy efficiency of the proposed AFDBF array outperforms that of a hybrid beamforming array.The measurement results indicate that the operating frequency band of the proposed array is 24.25–29.50 GHz.An eight-element linear array within the Tx array can achieve a scanning angle ranging from-47°to+47°in both the azimuth and the elevation planes,and the measured scanning range of each eight-element Rx array is–45°to+45°.The measured maximum effective isotropic radiated power(EIRP)of the eight-element Tx array is 43.2 dBm at 28.0 GHz(considering the saturation point).Furthermore,the measured error vector magnitude(EVM)is less than 3%when 64-quadrature amplitude modulation(QAM)waveforms are used.

Women on Boards of Directors

This research aims to measure the current gender representation in membership of boards of directors,and to study the factors affecting the presence of women on boards.The results of the study will support the decision makers and policy makers at all levels by providing knowledge that contributes to bridging the current gap in participation of women boards.The methodology used in this research is the descriptive analytical approach,which relies on quantitative methods in the process of collecting and analyzing data.This study represents the boards of directors in the three sectors(public,private,and non-profit)in the Kingdom of Saudi Arabia,The study sample contained 350 targets,where a random sample of 150 people in the public sector,100 people in the private sector,and 100 people in the non-profit sector were selected.The research result found that the majority of the responses believe that the lack of experience and training,and social factors,are the most impact areas of explaining the reasons for the existence of a gap in women’s membership in boards of directors in the three sectors.And the most important reasons for the existence of a gender gap in board membership are:there is no statutory minimum percentage for women’s representation on boards of directors,and scarcity of female competencies in general,and the lack of women occupying leadership positions.

基于PAI平台的电力大数据价值挖掘模式的探索与实践

随着电网信息化水平的不断提升,数据作为信息的载体呈现爆炸性增长。传统电力数据挖掘模式在数据获取、建模、分析和模型评估等方面自动化集成水平低,各阶段工作衔接不紧密,同时大部分模型构建复杂,耗时较多,与国家电网公司要求的高效、精准洞察业务价值目标存在一定的差距。基于电力云平台和全业务统一数据中心的建设完成,提出了一种集数据获取、模型构建、分析评估为一体的数据挖掘新模式,通过简化实验性数据获取流程,降低模型构建难度,有效提升电力大数据价值挖掘的速度,全面服务公司业务价值提炼工作。

BOB(Bosa On Board)设计研究

采用bosa on board的方式,将光通信电路直接铺设在PCB板上,替代传统的光模块独立器件,实现GPON/EPON产品的低成本高性能。

Development and Characterization of Particle Boards Based on Sorghum Husk

This study tackles current environmental challenges by developing innovative and eco-friendly particle boards utilizing sorghum husk, combined with recycled expanded polystyrene (EPS). This dual eco-responsible approach valorizes sorghum husk, often deemed agricultural waste, and repurposes EPS, a plastic waste, thus contributing to CO2 emission reduction and effective waste management. The manufacturing process involves dissolving recycled polystyrene within a solvent to create a binder, which is then mixed with sorghum husk and cold-pressed into composite boards. The study explores the impact of two particle sizes (fine and coarse) and two different concentrations of the recycled EPS binder. Results demonstrate significant variations in the boards’ mechanical properties, displaying a range of Modulus of Rupture (MOR) from 0.84 MPa to 3.85 MPa, and Modulus of Elasticity (MOE) spanning from 658.13 MPa to 1313.25 MPa, influenced by the binder concentration and particle size. These characteristics suggest that the boards can be effectively used in various construction applications, including interior decoration, false ceilings, and potentially for furniture and door manufacturing when combined with appropriate coatings. This study not only exemplifies the valorization of plastic and agricultural wastes but also offers a practical, localized solution to global climate change challenges by promoting sustainable construction materials.

补阳还五汤及拆方对血栓形成大鼠梗塞灶、血管损伤半暗区、血浆t-PA、PAI活性及ET含量的影响

利用已建立的冷光源光化学诱导血栓形成大鼠动物模型 ,观察补阳还五汤总方、补气药及活血药对模型大鼠梗塞面积、血管损伤半暗带面积及程度、局部脑组织血流、血浆t PA、PAI活性及血浆ET含量的影响。结果 :补阳还五汤总方对上述指标均有显著性影响 ,补气药及活血药均可缩小梗塞面积 ,减轻血管损伤程度 ,改善梗塞区上游供血区脑组织血流 ,抑制血浆PAI活性。活血药可显著降低血浆ET含量 ;补气药可显著地提高血浆t PA活性 。

灯盏细辛对犬急性心肌缺血时AT－Ⅲ活性、tPA和PAI的影响

用３０条麻醉开胸犬观察灯盏细辛对犬急性心肌缺血时ＡＴ－Ⅲ活性、ｔＰＡ和ＰＡＩ的影响。结果表明：１．灯盏细辛能够使缺血后ＡＴ－Ⅲ活性完全恢复至冠脉阻断前水平．缺血后６０ｍｉｎ和６ｈ与对照组相比。存在非常显著差异（Ｐ＜０．００１）；与潘生丁组相比，无显著差异。２．灯盏细辛能够提高缺血后ｔＰＡ浓度，缺血后６ｈ与对照组或潘生丁组相比，均存在明显差异（Ｐ＜０．０５）。３．灯盏细辛能降低缺血后ＰＡＩ浓度．缺血后６０ｍｉｎ和６ｈ，与对照组或潘生丁组相比均存在显著差异（Ｐ＜０．０１），灯盏细辛对缺血早期ＡＴ－Ⅲ活性、ｔＰＡ和ＰＡＩ的影响可能是灯盏细辛抗心肌缺血的作用原理。

Pax6 PAI亚结构域在黑色素细胞中对MITF、TYR、TYRP1和TYRP2的影响

【目的】高度保守的PAX转录因子家族在黑色素细胞的分化和黑色素的生成中起重要的作用,其家族共有的PD结构域是其与下游基因结合的主要位点,而PD结构域氨基端的PAI亚结构域在其与下游基因的结合过程中发挥重要的作用。研究表明Pax6在视网膜上皮黑色素细胞的分化中发挥至关重要的作用,本试验借助研究Pax6 PAI亚结构域的功能来对PAX转录因子家族共有的PD结构域和PAI亚结构域进行研究。【方法】首先通过Psipred对Pax6 PD结构域的结构进行分析,使用NCBI对Pax6 PD结构域与下游基因的结合位点进行分析,使用Jaspar对MITF、TYR、TYRP1和TYRP2启动子中Pax6 PD结构域可能的作用位点进行预测。使用普通PCR克隆Pax6PAI亚结构域,将其连入T载体,酶切后连入慢病毒载体,并送公司测序确认。将构建好的PAI亚结构域过表达载体通过细胞转染导入到培养的小鼠黑色素细胞中,使其过量表达。收集细胞,分别通过观察绿色荧光蛋白检测转染效率,使用RT-PCR和Western blot来检测MITF、TYR、TYRP1和TYRP2在m RNA和蛋白水平的变化,同时检测黑色素细胞中黑色素生成量的变化。【结果】通过NCBI分析可知,Pax6 PD结构域与下游基因的作用位点主要集中在氨基端的PAI亚结构域。通过Jaspar预测分析,得知,MITF启动子-695处存在Pax6 PD结构域的结合位点,TYR启动子-873和-1133处存在Pax6 PD结构域的结合位点,TYRP1启动子-629处存在Pax6 PD结构域的结合位点,TYRP2启动子-655处存在Pax6 PD结构域的结合位点。在黑色素细胞中过表达Pax6 PAI亚结构域后,与空载组相比,试验组MITF m RNA升高2.05倍(P<0.01),蛋白质升高1.7倍(P<0.01);TYR m RNA升高2.09倍,蛋白质升高2倍(P<0.05);TYRP1 m RNA升高2.93倍(P<0.05),蛋白质升高1.9倍(P<0.01);TYRP2 m RNA升高3.62倍(P<0.01),蛋白质升高1.37倍。同时试验组的黑色素含量是空载组黑色素含量的1.33倍(P<0.001)。【结论】在小鼠黑色素细胞中,过表达Pax6 PAI亚结构域可以促进MITF、TYR、TYRP1和TYRP2的表达,进而使黑色素细胞黑色素的生成量增加。

幽门螺杆菌cag PAI编码的Ⅳ型分泌系统

幽门螺杆菌(Helicobacter pylori,H.pylori)是定植于人胃部特定的病原菌,感染呈全球分布,感染率高达50%以上。现已证实它是轻度胃炎,消化性溃疡及胃癌的主要病因。Ⅰ型H.pylori菌株含有一个约40kb的特殊基因片段,即cag致病岛(cytotoxin associated gene pathogenicity island,cag PAI),该片段只出现于致病相关菌株,基因呈高密度分布并编码一个分泌转运系统称为Ⅳ型分泌系统(type Ⅳ secretion system,TFSS),通过转运相关毒素而参与H.pylori诱导上皮细胞细胞内的酪氨酸磷酸化、细胞骨架重排、基垫结构形成、活化核转录因子NF-κB、诱导促炎细胞因子白细胞介素-8的表达等,故在H.pylori的致病中起着关键作用。近年来,研究者们致力于研究Ⅳ型分泌系统的功能,但是对于这个装置是如何转运蛋白进入宿主细胞的确切机制还是知之甚少,因此,对Ⅳ型分泌系统的研究将有助于进一步明确H.pylori致病机制,并为临床诊断和治疗提供新的靶点。

L－精氨酸和LDL对血管内皮细胞合成t－PA和PAI的影响

本实验采用酶联免疫分析法检测猪主动脉内皮细胞培养液中ｔＰＡ抗原、ｔＰＡ活性和ＰＡＩ活性，并观察了ＬＤＬ和Ｌ精氨酸对ｔＰＡ和ＰＡＩ的影响。结果表明：ＬＤＬ能明显降低ｔＰＡ抗原含量。同时伴有ｔＰＡ活性的降低和ＰＡＩ活性增高；Ｌ精氨酸能增加ｔＰＡ抗原含量伴ｔＰＡ活性增高，但对ＰＡＩ活性无明显影响。实验提示Ｌ精氨酸能保护血管内皮细胞，增加其ｔＰＡ合成，并能部分地拮抗ＬＤＬ降低ｔＰＡ合成的作用，可能对动脉粥样硬化早期防治有重要应用价值。

脑血栓患者血浆中t－PA、PAI测定的临床意义

脑血栓患者血浆中ｔ－ＰＡ、ＰＡＩ测定的临床意义王细福，高幼奇，张昆南，赖瑶，谢旭芳，屈新辉纤维蛋白溶解（简称纤溶）是人体抗凝系统的重要组成之一。正常纤溶系统在预防血栓形成及消除血栓方面具有重要作用，而ｔ－ＰＡ和ＰＡＩ是纤溶系统的关键酶。ｔ－ＰＡ、ＰＡ...