水泵试验台液压夹紧装置设计

从系统机构设计、夹紧力分析、液压系统设计和电气控制原理等方面,阐述了水泵试验台液压夹紧装置的设计构造过程.为了保证试验时不发生泄漏现象,在管道联接端面采用抠槽密封处理技术,并对液压夹紧力进行计算与分析,得出在6.4 MPa的压力下,液压夹紧力约为88.238 kN,液压缸提供的最小工作压力为17.563 MPa.现场试验结果表明:与传统法兰联接方式相比,在规定试验压力下,该夹紧装置无泄漏现象,联接端面水力损失减小约0.156%,自动化程度高,水泵出厂检测台数增加约1.5倍,大幅度改善了水泵出厂检测的效率.     

Traditional Chinese medicine intervention for autism spectrum disorders: A protocol for systematic review and network meta-analysis

Background:Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social communication, social interaction, and restrictive or repetitive behaviors. Traditional Chinese medicine (TCM) has been used in the clinical management of ASD, especially in mainland China, where studies have shown promising efficacy. However, this remains to be further explored and clarified. Therefore, the purpose of this study was to evaluate the effectiveness and safety of conventional treatment-based TCM interventions for ASD.Method:The study will be conducted from January 2022, and the following electronic databases will be searched: China Biological Medicine Database, Chinese Scientific Journals Database, Wan Fang database, and China National Knowledge Infrastructure, the Cochrane Library, Web of Science, PubMed, and EMBASE Database. Only randomized controlled trials of TCM interventions for ASD will be included. The Autism Diagnostic Observation Scale, Autism Diagnostic Interview-Revised, and Childhood Autism Rating Scale will be the primary outcome indicators. The methodological quality of this Bayesian-based network meta-analysis will be performed using the “Risk of Bias” tool. Stata 14.0 and WinBUGS 1.4.3 will be used to analyze the data. In addition, assessment of heterogeneity, inconsistency, subgroups, sensitivity, and publication bias will be conducted using the Cochrane Collaboration''s tools.Results:The results of this study will be submitted to a peer-reviewed journal for publication.Conclusion:This study will help patients recover better, provide clinical evidence for practitioners, and promote the use of TCM in ASD interventions.     

Effects of Strength and Distribution of SiC on the Mechanical Properties of SiCp/Al Composites

In this paper, considering the strength and geometric discrete distribution characteristics of composite reinforcement, by introducing the discrete distribution function of reinforcement, the secondary development of ABAQUS is realized by using the Python language, the parametric automatic generation method of representative volume elements of particle-reinforced composites is established, and the tensile properties of silicon carbide particle-reinforced aluminum matrix composites are analyzed. The effects of particle strength, particle volume fraction, and particle random distribution on the mechanical properties of SiCp/Al composites are studied. The results show that the random distribution of particles and the change in particle strength have no obvious influence on the stress–strain relationship before the beginning of material damage, but have a great influence on the damage stage, maximum strength, and corresponding failure strain. With the increase in particle volume fraction, the damage intensity of the model increases, and the random distribution of particles has a great influence on the model with a large particle volume fraction. The results can provide a reference for the design, preparation, and characterization of particle-reinforced metal matrix composites.     

Differential Modulation of Innate Antiviral Profiles in the Intestinal Lamina Propria Cells of Chickens Infected with Infectious Bursal Disease Viruses of Different Virulence

Infectious bursal disease virus (IBDV) is one of the most important infectious diseases of poultry around the world. Gut-associated lymphoid tissues (GALT) are the first line of defense of the host against the infection. The purpose of this study was to investigate the role of innate immune antiviral signaling triggered by Toll-like receptor 3 (TLR3), as well as macrophage activation and cytokine response in the intestinal lamina propria (ILP) cells after the oral challenge of IBDV in relation to IBDV virulence and disease pathogenesis. The results showed that the expression levels of TLR3, IRF7, IFN-α/β and the corresponding downstream antiviral factors OAS, PKR and Mx were all upregulated in the SPF chicken ILP cells at 8 h post-infection (hpi) and 12 hpi. Similarly, macrophages were activated, with the initial macrophage M1 activation observed at 8 hpi, but then it rapidly shifted to a non-protective M2-type. Both Th1 (IFN-γ, TNF-α, IL-12) and Th2 (IL-4 and IL-10) types of cytokines were differentially upregulated during the early stage of infection; however, the Th1 cytokines exhibited stronger activation before 8 hpi compared to those of the Th2 cytokines. Interestingly, differential regulations of gene expression induced by different IBDV strains with different virulence were detected. The HLJ0504-like very virulent (vv) IBDV strain NN1172 induced stronger activation of TLR3-IFN-α/β pathway, macrophages and the Th1/2 cytokines’ expression, compared to those induced by the attenuated strain B87 at 8 hpi and 12 hpi in the ILP cells. In conclusion, the innate antiviral response mediated by the TLR3-IRF7 pathway, macrophage activation and cytokine expression in the GALT cells at the early stage of IBDV infection was differentially modulated, and the HLJ0504-like vvIBDV strain triggered stronger activation than the attenuated vaccine strain, and that may play an important role in the progression of disease.     

Molecular regulatory mechanism of ferroptosis and its role in gastrointestinal oncology: Progress and updates

Gastrointestinal (GI) tumors, including liver, pancreatic, gastric, and colorectal cancers, have a high incidence rate and low survival rate due to the lack of effective therapeutic methods and frequent relapses. Surgery and postoperative chemoradiotherapy have largely reduced the fatality rates for most GI tumors, but these therapeutic approaches result in poor prognoses due to severe adverse reactions and the development of drug resistance. Recent studies have shown that ferroptosis plays an important role in the onset and progression of GI tumors. Ferroptosis is a new non-apoptotic form of cell death, which is iron-dependent, non-apoptotic cell death characterized by the accumulation of lipid reactive oxygen species (ROS). The activation of ferroptosis can lead to tumor cell death. Thus, regulating ferroptosis in tumor cells may become a new therapeutic approach for tumors, making it become a research hotspot. Current studies suggest that ferroptosis is mainly triggered by the accumulation of lipid ROS. Furthermore, several studies have indicated that ferroptosis may be a new approach for the treatment of GI tumors. Here, we review current research progress on the mechanism of ferroptosis, current inducers and inhibitors of ferroptosis, and the role of ferroptosis in GI tumors to propose new methods for the treatment of such tumors.     

大鼠放射性脑损伤的MRS、PWI研究

目的研究大鼠放射性脑损伤不同时期的MRS、PWI表现,为其早期诊断提供依据。方法将成年大鼠30只随机分为对照组和照射组,照射前均行MRI、MRS及PWI检查。照射组分别于照射后1、3、6、9及12个月行MRI、MRS及PWI检查,计算NAA/Cr和Cho/Cr比值,测量灌注后大鼠双侧侧脑室周围的rCBV值。结果 1各照射组大鼠的NAA/Cr比值与对照组相比逐渐下降,差异均有统计学意义(P0.05);照射后Cho/Cr比值先上升,3个月时达峰值,随后逐渐下降,6个月内各组的Cho/Cr与对照组相比有统计学意义(P0.05);2照射1个月后各组的rCBV值均明显低于对照组,差异有统计学意义(P0.05)。结论 MRS及PWI能在放射性脑损伤发生形态学改变之前检测出脑组织代谢及灌注异常,为放射性脑损伤的早期诊断提供依据。     

双源CT灌注扫描对于索拉非尼治疗大鼠种植性肝癌疗效的评估

目的 定量分析双源CT灌注扫描各参数在索拉非尼靶向治疗大鼠肝癌模型前后的变化特点,评估各灌注参数与MVD及VEGF之间的相关性的研究.方法 荷瘤大鼠34只,随机分为实验组(26只),对照组(8只).分别给予索拉非尼及含等剂量溶剂的生理盐水20 mg/d,共灌胃21 d.治疗前后应用双源CT分别进行灌注扫描,观察2次灌注参数及肿瘤最大径的变化,第2次扫描结束后行HE及免疫组化检查.结果 (1)实验组大鼠治疗前后肝癌区BF、BV、pBV、ALP有统计学差异(P值均＜0.05),而MPI、PVP、HPI等值均无统计学差异(P值均≥0.05).对照组治疗前后肿瘤区域所有灌注参数均无统计学意义.(2)实验组治疗前后肿瘤最大径平均约为(0.828±0.319) cm和(0.573±0.435) cm (P=0.000),对照组肿瘤治疗前后最大径平均约为(0.816±0.401) cm和(1.370±0.332) cm(P=0.005).(3)MIP、ALP分别与VEGF及MVD呈正相关.结论 双源CT灌注扫描能够作为一项非侵袭性替代参数来评估经索拉非尼治疗后大鼠种植性肝癌的血流动力学变化.     

Genome-wide search for type 2 diabetes/impaired glucose homeostasis susceptibility genes in the Chinese: significant linkage to chromosome 6q21-q23 and chromosome 1q21-q24

This genome-wide search for susceptibility genes to type 2 diabetes/impaired glucose homeostasis (IGH) was performed on a relatively homogeneous Chinese sample with a total number of 257 pedigrees and 385 affected sibpairs. Two regions showed significant linkage to type 2 diabetes/IGH in the Chinese. The region showing linkage to type 2 diabetes/IGH from the entire sample group analysis was located on chromosome 6q21-q23 (128.93 cM, 1-LOD [logarithm of odds] support interval between 124 and 142 cM, according to the Marshfield genetic map), with a maximum likelihood score of 6.23, a nonparametric linkage (all) score of 4.48, and empirical P value <0.001. With a subanalysis based on 101 affected sibpairs with age at diagnosis of type 2 diabetes/IGH <40 years, we detected significant evidence for linkage to chromosome 1q21-q24 (192.1 cM, 1-LOD support interval between 182 and 197 cM), with a maximum likelihood score of 8.91, a nonparametric linkage (all) score of 5.70, and empirical P value <0.001. No interaction was observed between these two regions. Our independent replication of the region on chromosome 1q that has been shown to be linked significantly to type 2 diabetes/IGH in Chinese supports the notion that gene(s) in this region may be universally important in the development of human type 2 diabetes.     

十二指肠损伤的诊治体会(附42例分析)

目的：提高十二指肠损伤的诊治水平。方法：回顾性分析1990年1月至2001年12月收治的42例十二指肠损伤的患诊治体会。结果：十二指肠损伤42例中，行剖腹探查36例，死亡5例；行保守治疗6例，死亡2例。结论：十二指肠损伤救治工作中应遵循抢救诊断和治疗并重的原则。伤口探查、腹腔穿刺、超声检查、腹部平片对诊断有重要参考价值。有手术指征应立即急诊手术，无手术指征的病人应留院或住院观察，以防有迟发临床表现而耽误诊治。     

乳晕切口及残腔无缝合技术在乳腺良性肿块切除术中的应用

目的:有多种方法切除乳腺良性肿块,每种方法各有其特点,我们旨在探讨乳晕切口及残腔无缝合技术在切除乳腺良性肿块中的临床应用价值.方法:从2006年1月至2010年8月我们对2164例乳腺良性乳腺肿块住院患者进行乳晕切口切除肿块,对切除肿块后所留的残腔采用不缝合技术,通过随访,评价对乳腺良性肿块的治疗效果,总结经验.结果:采用乳晕切口及残腔无缝合技术,所有乳腺良性肿块均成功切除及痊愈,单个病灶长径为0.5cm～8cm, 病灶数量为1个～42个,手术时间37min(5～162min),乳房切口疤痕微细,保持乳房外形,硬块感率25.4%,硬块感时间29day(18 day～40day),患者满意98.4%.无严重并发症.结论:乳晕切口及残腔无缝合技术在乳腺良性肿块切的临床应用中,操作简单,美观,安全可行.