Influence Factors and Prediction Model of Bond Strength of Tunnel Fireproof Coating under Freeze–Thaw Cycles

The freeze–thaw resistant performance of a tunnel fireproof coating (TFC) has an important impact on bonding property and durability. The influence of redispersible emulsion powder, polypropylene fiber and air-entraining agent on TFCs was studied. Transverse fundamental frequency and ultrasonic sound velocity were used to evaluate the damage degree of TFC, and the mechanism was revealed by SEM and pore structure. The results show that the most beneficial effect on bond strength of TFC is redispersible emulsion powder, followed by air-entraining agent, and then polypropylene fiber. After freeze–thaw cycles, the cumulative pore volume of micropores in the TFC increases obviously, while the porosity of macropores does not change significantly. A prediction model was proposed, which can calculate the bond strength from the damage degree of TFC under freeze–thaw cycles. The achievement can promote the application of TFC in cold regions.     

生物信息学在肝细胞癌风险预测中的应用

生物信息学是一门交叉科学,通过综合运用数学、计算机科学和生物学的各种工具,来阐明和理解大量生物数据所包含的生物学意义。随着基因组学测序技术的不断发展,产生大量的生物学数据资源,从大数据中挖掘所蕴藏的生物学意义,已成为了当前亟待解决的主要任务之一。本文主要归纳总结基于特征基因的肝癌风险预测模型,为肝癌的早期检测、预后和治疗方案的优化提供新观点。     

Isoflurane preconditioning ameliorates electromagnetic pulse-induced neural damage by shifting microglia polarization toward anti-inflammatory phenotype via upregulation of SOCS1

With the speedy technological advances during the past few decades, human exposure to the electromagnetic field (EMF) has become increasingly common. Exposure to EMF may induce neural injuries and dysfunction of various organs, likely involving neuroinflammation and activation of microglial cells. Isoflurane preconditioning (IP) is shown to provide neuroprotection in various neurological diseases by inhibiting excessive neuroinflammatory responses. Brain samples harvested from rats exposed to electromagnetic pulse (EMP) with or without IP were subjected to qPCR, Western blot assay, and immunohistochemistry to determine the expression of pro-inflammatory/anti-inflammatory microglia markers and a variety of pro- and anti-inflammatory mediators. Suppressor of cytokine signaling 1 (SOCS1) siRNA was used in cultured N9 microglia cells to examine the roles of SOCS1 in the effect of IP. In both in vivo and in vitro experiments, EMP-exposed microglia were predominantly pro-inflammatory microglia, accompanied by increased expression of pro-inflammatory cytokines and chemokines, and activation of TLR4 pathway, leading to neuronal death. IP reversed the changes induced by EMP and switched the activated microglia to an anti-inflammatory phenotype. SOCS1 siRNA abolished the beneficial effects of IP. IP ameliorates EMP-induced neural injuries by shifting microglia polarization from pro-inflammatory to anti-inflammatory phenotype via upregulation of SOCS1.     

胃癌差异表达miRNA及其相关基因的单核苷酸多态性与胃癌预后的相关性研究

目的：探讨胃癌差异表达微小RNA（miRNA）及其相关基因的单核苷酸多态性（SNPs）与胃癌预后的相关性，为进一步寻找胃癌预后的生物标志物提供线索。方法：应用SNP芯片联合生物信息学分析对福建省胃癌高发区仙游县96例胃腺癌患者与96例健康对照人群基因组中miRNA及其相关基因的SNPs位点进行筛检，应用飞行时间质谱生物芯片（Sequenom MassARRAY）在344例胃癌患者中对筛检出来的SNPs位点进行检测。开展现场流行病学调查，通过面对面的访谈及问卷调查取得患者的病情、治疗方法、患病后1年的生活饮食习惯，分析其预后情况。结果：共筛检出11个miRNA及其相关基因的SNPs位点，包括5个miRNA自身SNPs、5个miRNA靶序列SNPs以及1个miRNA生物合成通路基因相关SNPs。单因素分析显示miR-1297 rs9536676、MSH2 rs17502941位点的多态性与胃癌预后有关联性，其余的多态性位点均与胃癌预后无明显相关性。多因素分析显示是否手术、TNM分期、rs17502941 AA/AG基因型均是影响胃癌预后的独立危险因素。按年龄TNM分期联合分层得出，miR-1297 rs9536676、miRNA-519b rs10413288、miR-379 rs7143252、FAS基因rs1468063、EGFR基因rs10277413位点均与胃癌患者的生存分布有关联。联合作用分析结果显示患者同时携带rs9536676 AA/AG和rs17502941 GG、rs9536676 AA/AG和rs10413288 AA、rs17502941 GG和rs10413288 AA基因型可能会增加预后不良的风险（P < 0.05）。结论：胃癌差异表达miRNA及其相关基因的SNPs与胃癌病人预后密切相关，可能作为判断胃癌预后的生物标志物。     

生长抑素及其类似物联合质子泵抑制剂应用于急性非静脉曲张性上消化道出血的循证分析

目的 系统评价生长抑素及其类似物联合质子泵抑制剂（proton pump inhibitor，PPI）治疗急性非静脉曲张性上消化道出血（acute non-variceal upper gastrointestinal bleeding，ANVUGIB）的有效性和安全性，并分析其用药经济性。方法 采用循证医学方法搜集生长抑素及其类似物联合PPI治疗ANVUGIB的RCT、队列研究进行meta分析，得到相应的有效性及安全性分析结果，并进行成本-效果分析。结果 最终纳入6个RCT均未接受内镜治疗，共610例受试者。Meta分析结果显示，生长抑素及其类似物联合高、中、低剂量PPI治疗在以下方面均优于单用高、中、低剂量PPI治疗，差异有统计学意义，总有效率[OR=3.34，95%CI（2.03，5.47），P<0.000 01]、止血时间[MD=-9.04，95%CI（-11.69，-6.38），P<0.000 01]、输血量[MD=-1.10，95%CI（-1.46，-0.74），P<0.000 01]；在不良反应发生率方面，2组差异无统计学意义[OR=0.49，95%CI（0.11，2.12），P=0.34]。ANVUGIB患者予生长抑素联合高、中、低剂量奥美拉唑与单用高、中、低剂量奥美拉唑进行成本-效果分析，增量成本效果比分别为172.28，217.26，330.37，敏感性分析后显示结果稳定。而接受内镜治疗后应用生长抑素及其类似物联合PPI治疗仅1个队列研究，研究结果显示内镜治疗成功后联合治疗并不优于PPI单药治疗。结论 现有证据表明，生长抑素及其类似物联合PPI治疗未经内镜治疗的ANVUGIB患者为较有效的方案，两者安全性相当、耐受性较好，从药品直接成本考虑，高剂量PPI组联合治疗较中、低剂量PPI组联合治疗更具有成本效果性。而对于经内镜下止血治疗的患者两者疗效相当，可考虑单用PPI。     

住院艾滋病患者主要照顾者负性心理的质性研究

目的了解住院艾滋病亲属照顾者在看护期间内的主要压力源及负性心理体验。方法采用个人深度访谈法,收集8名照顾者的资料,用主题分析法进行分析,归纳住院艾滋病患者主要照顾者的压力源种类及其负性心理体验。结果照顾者压力源主要来源包括与艾滋病相关的压力源、与经济相关的压力源及与社会文化相关的压力源;照顾者的负性心理体验主要有怀疑、否认,恐惧、害怕,痛苦、矛盾,愤怒,迷茫无助及社交减少。结论住院艾滋病患者照顾者的压力源来源于多个方面,其负性心理体验复杂,研究者应重视主要照顾者的压力,为其提供有效的干预措施,加强支持系统。     

电针对SAMP8小鼠皮质及海马突触素和突触后致密物-95表达的影响

目的观察电针对SAMP8小鼠皮质及海马突触素(SYN)和突触后致密物-95(PSD-95)表达的影响,探讨电针治疗阿尔茨海默病的介入时机。方法 SAMP8小鼠48只随机分为模型组、3月龄电针组、6月龄电针组和9月龄电针组,每组12只,选取同龄正常老化SAMR1小鼠12只为对照组。电针组电针"百会""大椎""肾俞",频率2 Hz,每日1次,8 d为1个疗程,疗程间隔2 d,共3个疗程。各组均在10月龄取材,选择皮质及海马区,采用免疫组化和Westernblot检测突触相关蛋白SYN、PSD-95的表达。结果与对照组比较,模型组小鼠皮质及海马SYN和PSD-95蛋白表达明显降低(P<0.01);与模型组比较,各电针组小鼠皮质及海马SYN、PSD-95蛋白表达明显升高(P<0.05,P<0.01);与3月龄电针组比较,6月龄电针组、9月龄电针组皮质及海马SYN、PSD-95蛋白表达明显降低(P<0.05,P<0.01)。结论电针可促进SAMP8小鼠皮质及海马SYN、PSD-95蛋白的表达,改善突触功能,且早期电针治疗效果最明显。