Netrin-1 signaling pathway mechanisms in neurodegenerative diseases

Netrin-1 and its receptors play crucial roles in inducing axonal growth and neuronal migration during neuronal development.Their profound impacts then extend into adulthood to encompass the maintenance of neuronal survival and synaptic function.Increasing amounts of evidence highlight several key points:(1)Diminished Netrin-1 levels exacerbate pathological progression in animal models of Alzheimer’s disease and Parkinson’s disease,and potentially,similar alterations occur in humans.(2)Genetic mutations of Netrin-1 receptors increase an individuals’susceptibility to neurodegenerative disorders.(3)Therapeutic approaches targeting Netrin-1 and its receptors offer the benefits of enhancing memory and motor function.(4)Netrin-1 and its receptors show genetic and epigenetic alterations in a variety of cancers.These findings provide compelling evidence that Netrin-1 and its receptors are crucial targets in neurodegenerative diseases.Through a comprehensive review of Netrin-1 signaling pathways,our objective is to uncover potential therapeutic avenues for neurodegenerative disorders.

Examining the Relationship Between Spatial Configurations of Urban Impervious Surfaces and Land Surface Temperature

The urban heat island(UHI) effect has significant effects on the quality of life and public health. Numerous studies have addressed the relationship between UHI and the increase in urban impervious surface area(ISA), but few of them have considered the impact of the spatial configuration of ISA on UHI. Land surface temperature(LST) may be affected not only by urban land cover, but also by neighboring land cover. The aim of this research was to investigate the effects of the abundance and spatial association of ISAs on LST. Taking Harbin City, China as an example, the impact of ISA spatial association on LST measurements was examined. The abundance of ISAs and the LST measurements were derived from Landsat Thematic Mapper(TM) imagery of 2000 and 2010, and the spatial association patterns of ISAs were calculated using the local Moran’s I index. The impacts of ISA abundance and spatial association on LST were examined using correlation analysis. The results suggested that LST has significant positive associations with both ISA abundance and the Moran’s I index of ISAs, indicating that both the abundance and spatial clustering of ISAs contribute to elevated values of LST. It was also found that LST is positively associated with clustering of high-ISA-percentage areas(i.e.,>50%) and negatively associated with clustering of low-ISA-percentage areas(i.e.,<25%). The results suggest that, in addition to the abundance of ISAs,their spatial association has a significant effect on UHIs.

Configuration Analysis of Deepwater S-Lay Pipeline

The safety of offshore pipeline has drawn a great deal of attention during deepwater installation due to the combined actions of high external pressure, axial tension, and bending moment. Meanwhile, the pipeline configuration has a remarkable effect on the structural behaviour of the tube. The special studies focus on the deepwater S-lay technique in the present paper. The stiffened catenary theory is applied to establish the static equilibrium governing differential equation of a pipe element, and the solution equations of the total pipeline configuration from a lay-barge over a stinger to the seabed are derived, The numerical iteration method for solving pipeline configuration is described in detail, and the corresponding program is developed to conduct the analysis of effects of various parameters such as laying water depth, pipe diameter, thickness of concrete weighted coating layer, stinger length, control strain, and axial tension on pipeline configuration. The results show that the laying water depth, the submerged weight of the pipe, and the axial tension are the critical factors influencing pipeline configuration. In addition, geometrical parameters of the stinger such as length, radius, and shape have an important effect on the pipe-laying capacity of the vessel. The validity of the program is further verified by means of a comparison with results obtained from the commercial finite element software OFFPIPE.

Helical Configurations of Elastic Rods in the Presence of Interfacial Traction

The Kirchhoff thin elastic rod models are always the important basis to explore the configuration mecha- nism of the flexible structures in both the macroscopic and microscopic scale. As a continuum model of DNA, a thin elastic rod subjected to interfacial interactions is used to investigate the helical equilibrium configuration of DNA in salt solution. In this paper, the Kirchhoff＇s equations in the presence of interracial traction and the free energy density functions of different configurations are studied. The transition formula of the free energy between B-DNA and Z- DNA is obtained, and the results show that the free energy of the transition is mainly determined by the salt concentra- tion, which agrees well with the experimental data.

THEORETICAL STUDY ON THE CONFIGURATION OF [PdCl_2(C_2H_4OH)]-

The configuration of[PdCl_2(C_2H_4OH)]^- has been studied by pseudopotential ab initio method.A cis isomer was found to be the reaction intermediate in the Wacker process.

Topological Configuration and Rotation Analysis of the Three⁃Order Rubik􀆳s Cube

The mechanism of three⁃order Rubik􀆳s Cube(RC)has the characteristics of recombination and variable degree of freedom,and it is difficult to accurately describe the degree of its freedom.This paper takes RC as the research object,and the adjacency matrix is constructed based on topology and graph theory in order to describe the variation rule of topological configuration in the single layer rotation of RC.In this paper,the degree of freedom of the RC in any shape can be described by defining the concept of entanglement degree of freedom,establishing a set of adjacency matrix,and determining the degree of freedom of the RC which is attributed to the number of non⁃zero elements in the set of adjacent matrix.The prime number is proposed to describe the rotation of the RC combined with the rotation recognition of RC,which is simple and convenient for computer processing.The research contents in this paper are beneficial to the study of RC from the perspective of mechanism science.Meanwhile,it is of great significance to the study of other complex mechanisms with variable degrees of freedom.

基于C/S架构和物联网技术的可移动医疗设备共享调配系统的设计与应用

目的 设计一个可移动医疗设备高效管理与临床科室共享调配相结合的医疗设备共享管理平台,实现可移动医疗设备使用的全过程管理。方法 基于C/S架构,利用物联网技术优化整合现有医疗设备大数据资源,结合医院需求,构建可移动医疗设备共享调配系统,实现医疗设备共享管理、预约借用、统计分析等核心功能。通过比较系统上线前后呼吸机调配次数、平均调配时间、呼吸机使用率、单台呼吸机日均收入4个指标,分析系统应用效果。结果 系统上线后,呼吸机调配次数明显增加、平均调配时间明显降低,呼吸机使用率、单台呼吸机日均收入明显升高,且差异均有统计学意义(P﹤0.05),表明系统对提高呼吸机调配效率与使用效率有促进作用。结论 可移动医疗设备共享调配系统优化了医院设备管理流程,实现了医疗资源的统一调配,有效满足临床紧急抢救时医疗设备调配使用的相关需求,提高了医疗设备周转率以及设备管理人员的工作效率,有助于医院节约人员成本、降低采购费用,为医院管理者制定相关决策提供数据支撑。

Research on customer-oriented product configuration technology of aircraft

Due to the defects of current aircraft product configuration technology, such as the gap between product design and cus- tomers＇ requirements, the low configuration efficiency and etc. a customer-oriented product configuration solution of aircraft was proposed in this paper. Basing on a deep investigation into the market and the structure of the aircraft, this paper proposed a method of dividing and creating the aircraft options, in which we set up optional constraints to meet the demand of configuration and then optimized the constraint algorithm. This work can help to realize the optimum association between the aircraft options and modules. Basing on a research on customer demand, The paper established a customer demand model and a mapping relationship which exists between customer demand and aircraft options, It can also help to make a great contribution to build customer personalized demand of the aircraft configuration orocess and the aircraft confimiration library.

妊娠糖尿病患者蛋白C、蛋白S和抗凝血酶Ⅲ水平及其与孕周的关系

目的探讨妊娠糖尿病(GDM)患者蛋白C(PC)、蛋白S(PS)和抗凝血酶Ⅲ(ATⅢ)水平及其与孕周的关系。方法选择2019年1月至2023年3月在医院就诊的232例GDM孕妇作为观察组,同时随机选取同期在医院进行孕检的268例正常孕妇作为对照组,比较两组一般资料和PC、PS和ATⅢ水平;按孕周将观察组和对照组分为孕中期和孕晚期,分别比较孕中期和孕晚期观察组和对照组PC、PS和ATⅢ水平。通过相关性分析,分析PC、PS和ATⅢ水平与孕周的相关性。结果与对照组相比,观察组PS和PC水平降低(P<0.05),但ATⅢ水平差异无统计学意义(P>0.05)。GDM患者PC和ATⅢ水平与孕周呈负相关(r=-0.156、-0.134,P<0.05)。结论GDM患者PS和PC水平降低,且随孕周增大,PC、PS和ATⅢ水平降低,应尽早进行干预,以减少血栓形成的风险。

miR29c下调S100A4蛋白表达参与人胃癌细胞增殖促进凋亡

目的探讨miR-29c对人胃腺癌细胞增殖、凋亡的影响及其与转移相关蛋白S100A4的关系。方法采用细胞培养人胃癌细胞系BGC-823、SGC-7901和人正常胃粘膜上皮GES-1细胞,应用qRT-PCR检测各株细胞miR29c的表达。用hsamiR29c-mimics类似物(miR29c组),hsa-miR29c-inhibitor(阴性对照组)分别转染BGC-823细胞,空白对照组加入转染液,用CCK8及MTT法检测细胞增殖,流式细胞术检测细胞凋亡,Western blot检测S100A4相关肿瘤相关蛋白的表达。结果与正常胃粘膜上皮细胞GES-1表达率(1.131±0.069)相比,MiR-29c在胃癌细胞BGC823(0.254±0.025),SGC-7901(0.466±0.057)(F=57.5,P<0.05)。BGC823细胞转染miR29c模拟物后MiR-29c的表达量为:4.126±0.231,0.405±0.174,0.557±0.102,差异具有统计学意义(F=850.1,P<0.05)。转染24h、48h、72h后,MiR-29c组细胞的OD450值分别为:1.074±0.127、1.609±0.178、2.008±0.104;阴性对照组为:0.419±0.169、0.477±0.092、0.738±0.153,空白对照组为:0.830±0.305。其中,转染48h、72h后,MiR-29c组明显高于对照组(F=59.46,P<0.05)。细胞转染24h后,miR29c组细胞凋亡率分别是(6.900±0.414)%、(4.490±0.316)%、(3.850±0.243)%,,阴性对照组凋亡率分别是(10.830±0.231)%、(11.940±0.279)%、(13.530±0.941)%,空白对照组凋亡率分别是:(10.190±0.188)%、(11.76±0.569)%、(13.260±0.987),(P<0.001).各组S100A4蛋白的表达分别为0.770±0.028、1.109±0.083、1.024±0.042,(P=0.0021)。结论miR29c在胃癌细胞系中表达降低,通过抑制S100A4抑制人胃癌细胞增殖并促进胃癌细胞凋亡。

NOTCH3基因C260S位点突变导致CADASIL的临床和影像学特征分析

目的探讨NOTCH3基因第5外显子C260S位点突变导致的伴有皮层下梗死和白质脑病的常染色体显性遗传性脑动脉病(cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy,CADASIL)家系的临床和影像学特征。方法选取2021年12月首都医科大学附属北京同仁医院来自同一家庭的CADASIL患者,对所有患者进行NOTCH3基因测序,回顾性分析患者的临床表现和头颅影像学特征。复习既往文献报道的导致同一位置氨基酸改变的其他突变类型的临床及影像学特征。结果4名家庭成员中,包括先证者(46岁,女)及其两个姐姐(分别为48岁和50岁)和女儿(18岁)。先证者及其父亲、两个姐姐都有偏头痛病史,其中大姐有记忆力减退;先证者患有脑梗死及伴有视觉先兆的偏头痛;先证者女儿体健;先证者父亲因脑梗死去世。4名家庭成员均存在C260S位点的NOTCH3基因突变。既往文献无此位点突变的报道,先证者头颅MRI示右侧脑桥亚急性梗死,颞叶、脑室周围及脑干异常高信号改变,其大姐脑桥可见腔隙性梗死灶。结论NOTCH3基因第5外显子c.778T>A(p.C260S)的罕见突变导致的CADASIL发病时间早,早期会出现认知障碍。合并偏头痛的脑干梗死患者,需警惕CADASIL的可能。

谷氨酸、CRP及S-100β蛋白水平与脑出血患者预后的关系

目的:分析谷氨酸、C反应蛋白(CRP)及S-100β蛋白水平与脑出血患者预后的关系。方法:选择2021年1月—2023年12月南昌大学第四附属医院收治的80例脑出血患者,患者入院后采集血样,测定血清谷氨酸、CRP及S-100β蛋白水平。随访90 d,采用格拉斯哥预后量表(GPS)进行预后评价,根据GPS评分分为预后不良组(1~3分)、预后良好组(4~5分),比较两组谷氨酸、CRP及S-100β蛋白水平,分析谷氨酸、CRP及S-100β蛋白水平与预后的相关性,采用受试者操作特征(ROC)曲线分析这些生物标志物对患者预后预测的价值。结果:在80例脑出血患者中,预后不良发生率为43.75%(35/80)。预后不良组血清谷氨酸、CRP及S-100β蛋白水平均高于预后良好组(P<0.05)。点二列相关系数分析结果显示,谷氨酸、CRP及S-100β蛋白与预后呈正相关(r=0.709、0.764、0.654,P<0.05)。Pearson相关系数分析显示,谷氨酸、CRP与S-100β蛋白呈正相关(r=0.361、0.431,P<0.001)。ROC曲线显示,谷氨酸、CRP、S-100β蛋白对患者预后预测的AUC分别为0.912、0.945、0.881,有一定预测价值。结论:谷氨酸、CRP及S-100β蛋白水平与脑出血患者的预后呈正相关,并具有一定的预测价值,在评估脑出血患者的预后时,这些可作为重要的参考指标之一。

基于STC12C5A60S2单片机显示模块的实验研究

以常用的STC12C5A60S2单片机为主控芯片,以实验室单片机平台为载体,分别对数码管、LCD1602、LCD12864、OLED以及TFT五种显示屏进行DS18B20温度传感器采集与显示实验。实验测试结果表明五种显示模块均能有效采集并显示当前温度值,对比分析各种显示模块的性能,为不同应用场景下的显示需求提供了参考和借鉴,具有重要的实际应用价值。

纳米C-S-H/PCE对蒸养UHPC力学性能增强机理研究

目前超高性能混凝土(UHPC)制品的力学性能有待进一步提升,采用纳米C-S-H/PCE对UHPC进行增强在理论上是一种可行的技术途径。本文研究了蒸养条件下掺入以聚羧酸(PCE)为分散剂的纳米水化硅酸钙(C-S-H/PCE)对UHPC力学性能的影响,通过测试水化热、水化产物、微观形貌和孔结构等对其机理进行了分析。结果表明,掺入3.0%(质量分数)纳米C-S-H/PCE可以显著提高蒸养UHPC的抗压强度和抗折强度。掺入纳米C-S-H/PCE可以促进UHPC的早期水化,生成更多的水化硅酸钙(C-S-H)凝胶,使水化放热温峰增高,并缩短达到水化温峰的时间。掺入纳米C-S-H/PCE可有效改善蒸养UHPC的孔结构,在掺量为3.0%(质量分数)时总孔隙率最小,有害孔比例最低。该研究可为纳米C-S-H/PCE在蒸养UHPC中的应用提供参考。

基于剩余电流和不平衡电流突变向量比的TN-C-S系统漏电故障检测方法

TN-C-S系统在我国应用广泛,但由于固有剩余电流大,无法区分负荷投切和故障引起的剩余电流变化,漏电总保和中保无法投运,存在安全隐患。针对该问题,提出一种基于剩余电流和不平衡电流突变量之比的漏电故障保护方法。首先,分析剩余电流回路,剩余电流和不平衡电流突变量之比在单相接地故障发生时刻突变,在负荷投切时不变。其次,基于中性线阻抗和接地阻抗不会发生突变的特征,计算故障电流突变量幅值,以故障电流突变量幅值越限作为故障判别依据,实现漏电故障检测。仿真及试验证明,所提方法可有效区分负荷投切和漏电故障,实现大幅值固有剩余电流下的漏电故障检测,在单支路和多支路系统中的检测灵敏度分别为70、150 mA,满足TN-C-S系统多级漏电保护的灵敏度要求。

基于STC12C5A60S2的温湿度控制系统设计

文章针对环境温湿度对纺织生产影响很大的情况,设计温湿度控制系统。系统采用STC12C5A60S2为控制核心,由DHT11进行数据采集,并且采用直观的1602LCD数字显示模块,以实现温度和湿度实时显示,高温时启动外部负载降温,低温时外部负载停止工作的控制,以将温湿度控制在一定的范围内,可以帮助纺织厂生产区域控制环境温湿度,确保纺织厂的温湿度符合要求。

10℃条件下纳米C-S-H掺量对水泥早期水化的影响

目的探究10℃条件下不同掺量纳米C-S-H对水泥早期水化进程及强度发展的影响,并分析其早强剂作用机理。方法通过溶液共沉淀法制备纳米C-S-H悬浮液,将其掺入到普通硅酸盐水泥中,在10℃条件下进行养护,分析其对水泥凝结时间、抗折强度、抗压强度的影响;通过XRD、TG等检测手段分析水泥的水化进程及对水化产物的影响。结果掺入0.05%纳米C-S-H,可使水泥初凝时间缩短9.9%,终凝时间缩短10.4%;24 h时抗折强度和抗压强度分别提高了34%和33.5%。纳米C-S-H的掺入造成水泥3 d抗折强度略有降低。水化产物中Ca(OH)2质量分数在12 h、16 h和24 h时较参比样分别提高了17.6%、21.3%和29.6%。结论在10℃条件下,纳米C-S-H的加入能够有效促进C 3S和C 2S的水化过程,形成更多的水化产物,从而缩短水泥凝结时间,提高24 h内水泥砂浆强度,28 d强度没有显著降低。

补体C1s对食管鳞状细胞癌生物学行为的影响

目的:探究补体分子C1s对食管鳞状细胞癌(ESCC)细胞增殖、迁移、黏附以及裸鼠移植瘤生长的影响。方法:利用NCBI-GEO数据库分析ESCC组织和癌旁正常组织(ANTs)中C1S mRNA的表达;采用RT-qPCR和Western blot检测ESCC细胞系中C1s的表达;利用C1s小干扰RNA(siRNA)、C1s短发夹RNA(shRNA)或C1s过表达慢病毒对ESCC细胞进行C1s的敲低或过表达,CCK-8法检测细胞增殖,细胞划痕实验检测细胞迁移,细胞-基质黏附实验检测细胞黏附能力;Western blot检测基质金属蛋白酶MMP1和MMP13表达;裸鼠皮下成瘤实验检测C1s对裸鼠移植瘤生长的影响,免疫组织化学法检测移植瘤中CD34表达,分析肿瘤微血管的形成。结果:ESCC组织中C1S mRNA表达明显高于ANTs,敲低C1s可明显抑制ESCC细胞的增殖、迁移、细胞-基质黏附以及裸鼠移植瘤的生长,而过表达C1S则具有相反的效果;C1s敲低的ESCC细胞TE-1中MMP1和MMP13的表达降低;与对照组相比,C1s过表达组移植瘤中的微血管更加丰富。结论:C1s在ESCC组织中显著上调,并促进ESCC细胞的增殖、迁移、细胞-基质黏附以及裸鼠移植瘤的生长。C1s可能在ESCC发生发展中发挥重要作用。

感应加热温度对滚珠丝杠用S55C钢微观组织及力学性能的影响

为了优化感应淬火工艺参数,改善滚珠丝杠表面硬度和力学性能,研究了滚珠丝杠用S55C钢的感应淬火工艺.利用自行设计的感应加热工装对滚珠丝杠用S55C钢试样进行感应淬火处理,使用光学显微镜和扫描电子显微镜进行微观结构表征,并采用拉伸试验、金相实验和显微硬度测试,分析了感应加热温度对试样的微观组织、显微硬度和断口形貌等方面的影响.结果表明:油冷时,当试样加热至960℃左右,微观组织为均匀细小马氏体,维氏硬度约为750,抗拉强度约为1200 MPa;水冷时,当试样加热至860℃左右,微观组织也为均匀细小马氏体,维氏硬度约为800,抗拉强度约为780 MPa;油冷试样和水冷试样在室温拉伸时所展现的断裂方式均为脆性断裂,油冷试样多表现出解理断裂特征,而水冷试样沿晶断裂特征更明显,并出现明显的冰糖状断裂形貌.该研究结果可为滚珠丝杠用S55C钢感应淬火工艺的设计提供理论依据和技术指导.

血清CysC、α-Syn联合MRI对帕金森病病情评估及诊断的意义

目的 探讨血清胱抑素C(CysC)、α-突触核蛋白(α-Syn)联合磁共振成像(MRI)对帕金森病(PD)病情评估及诊断的意义。方法 将2019年4月至2021年4月于河北省沧州中西医结合医院(下称该院)治疗的PD患者87例纳入研究作为PD组。根据Hoehn-Yahr(H-Y)分期,将PD患者分为Ⅰ~Ⅱ期13例,Ⅲ~Ⅳ期45例,Ⅴ期29例。另外,选取同期于该院进行体检的健康志愿者87例作为对照组。比较各组血清CysC、α-Syn水平,分析血清CysC、α-Syn联合MRI对PD的诊断效能。结果 PD组血清CysC、α-Syn水平均高于对照组,差异有统计学意义(P<0.05);血清CysC、α-Syn水平随着H-Y分期递增升高(P<0.05)。PD组MRI各相位值与对照组比较,黑质致密带、苍白球、壳核、尾状核相位值均降低(P<0.05);不同H-Y分期的PD患者黑质致密带、苍白球、壳核相位值比较,差异均有统计学意义(P<0.05)。CysC、α-Syn单独诊断PD的AUC分别为0.786、0.767,灵敏度分别为58.62%、64.37%,特异度分别为88.51%、87.36%;与MRI、血清CysC、α-Syn单独诊断相比,三项联合诊断PD的灵敏度和准确度较高同,差异有统计学意义(P<0.05)。结论 血清CysC、α-Syn联合MRI对PD诊断效能较高,能为评估PD病情严重程度和早期诊断提供依据。