目的评估在骨质疏松条件下,行L5/S1节段斜外侧椎间融合术(oblique lateral interbody fusion at L5/S1,OLIF51)及其联合双侧皮质骨轨迹螺钉(cortical bone trajectory screw,CBT)和双侧椎弓根螺钉(bilateral pedicle screw,BPS)的生物...目的评估在骨质疏松条件下,行L5/S1节段斜外侧椎间融合术(oblique lateral interbody fusion at L5/S1,OLIF51)及其联合双侧皮质骨轨迹螺钉(cortical bone trajectory screw,CBT)和双侧椎弓根螺钉(bilateral pedicle screw,BPS)的生物力学性能。方法招募1名健康青年男性作为志愿者,获得其腰骶椎三维CT数据,在有限元分析软件中完成L4~S1三维模型,采用前路钛板(titanium plate,TP)固定的OLIF51手术模型、OLIF51+CBT和OLIF51+BPS手术模型的构建,分别命名为A、B、C、D模型。通过赋值、设定条件、施加载荷,分析不同条件下的生物力学特性。结果顺利完成4种有限元模型的构建。4种模型在所有运动中的平均活动度(range of motion,ROM)变化趋势为A模型>B模型>C模型>D模型;其中,与A模型相比,B模型降幅为84.21%~94.42%,C模型降幅为88.12%~96.40%,D模型降幅为90.07%~96.49%(P均<0.05);与B模型相比,C模型降幅为7.41%~52.38%,D模型降幅为27.78%~58.33%(P均<0.05)。3种手术模型在所有运动中的融合器(Cage)平均最大应力变化趋势为B模型>C模型>D模型;其中,与B模型相比,C模型降幅为12.89%~57.62%,D模型降幅为36.43%~73.11%;D模型和C模型相比,除左侧弯外差异均有统计学意义(P均<0.05);D模型降幅为21.83%~37.67%。3种手术模型在所有运动中的内固定平均最大应力变化趋势为B模型>C模型>D模型;与B模型相比,C模型降幅为3.55%~65.47%,D模型降幅为18.58%~84.41%;CBT应力大于BPS应力(P<0.05)。结论在OLIF51手术中,补充后路内固定可以增强融合节段的稳定性并减轻TP上的应力。不建议对骨质疏松症患者单独进行OLIF51手术,使用BPS辅助固定可达到最佳生物力学特性。接受CBT辅助内固定的患者术后需要佩戴支具,并尽量避免融合部位的右侧弯曲运动。展开更多
目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDK...目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDKAL1基因rs7756992位点A>G多态性与T2DM易感性的病例对照研究,以病例组与对照组CDKAL1基因rs7756992位点各种基因模型的比值比(OR)及其95%置信区间(CI)为效应指标进行meta分析,并根据研究人群种族不同进行亚组分析。结果本研究共纳入15篇文献,T2DM组和对照组病例数分别为24 315例和35 132例。Meta分析显示,CDKAL1基因rs7756992位点A>G多态性与T2DM易感性有关联[等位基因模式(G vs A):OR=1.171,95%CI1.122~1.223,P<0.001;共显性模式(GG vs AA):OR=1.380,95%CI1.258~1.515,P<0.001;共显性模式(AG vs AA):OR=1.131,95%CI 1.089~1.176,P<0.001;显性模式(AG+GG vs AA):OR=1.168,95%CI 1.101~1.240,P<0.001;隐性模式(GG vs AA+AG):OR=1.343,95%CI 1.282~1.405,P<0.001]。亚组分析显示,亚洲人群和白种人群中携带CDKAL1基因rs7756992位点G等位基因的人群发生T2DM的风险增加(P<0.05);而非洲人群中携带CDKAL1基因rs7756992位点G等位基因与A等位基因的人群发生T2DM风险的差异无统计学意义。结论在亚洲人群及白种人群中CDKAL1基因rs7756992位点A>G等位基因的突变可能是T2DM发病的危险因素之一。展开更多
目的:探究体外培养胰腺癌细胞系中L1CAM与α5-整合素产生促血管生成因子对内皮细胞血管生成方面的影响。方法:将重组质粒pc DNA3.1-L1CAM和α5-整合素小干扰RNA分别转入Patu8988和Capan-2胰腺癌细胞系上调和下调靶基因的表达。Western b...目的:探究体外培养胰腺癌细胞系中L1CAM与α5-整合素产生促血管生成因子对内皮细胞血管生成方面的影响。方法:将重组质粒pc DNA3.1-L1CAM和α5-整合素小干扰RNA分别转入Patu8988和Capan-2胰腺癌细胞系上调和下调靶基因的表达。Western blot及实时定量PCR检测Patu8988及Capan-2胰腺癌细胞系中促血管生成因子[信号转导及转录激活因子3(signal transducers and activators of transcription3,STAT3)、磷酸化信号转导及转录因子3(phosphorylated signal transducers and activators of transcription 3,pSTAT3)、血管内皮生长因子-A(vascular endothelial growth factor-A,VEGF-A)、血管生成素2(angiopoietin-2,Ang-2)]表达的水平差异;血管生成实验检测改变L1CAM及α5-整合素表达水平后Patu8988和Capan-2胰腺癌细胞系上清液对体外血管生成的影响。结果:上调Patu8988及Capan-2胰腺癌细胞系中L1CAM的表达水平可促进pSTAT3、VEGF-A及Ang-2的mRNA及蛋白表达水平(P<0.01),并促进人脐静脉内皮细胞系(human umbilical vein endothelium cell,HUVEC)的完整血管形成(P<0.01)。而抑制Patu8988及Capan-2胰腺癌细胞系中的α5-整合素表达水平显著减少pSTAT3、VEGF-A及Ang-2的mRNA及蛋白表达水平(P<0.01),并明显削减了HUVEC的成管能力(P<0.01)。结论:体外培养胰腺癌细胞系中,L1CAM表达水平增加显著促进促血管生成因子表达和血管生成能力;而抑制α5-整合素的表达水平则可显著抑制促血管生成因子表达和成管能力。展开更多
BACKGROUND:The genetic diversity of chemokines and chemokine receptors has been associated with the outcome of hepatitis B virus infection.The aim of this study was to evaluate whether the copy number variation in the...BACKGROUND:The genetic diversity of chemokines and chemokine receptors has been associated with the outcome of hepatitis B virus infection.The aim of this study was to evaluate whether the copy number variation in the CCL3L1 gene and the polymorphisms of CCR5Δ32 and CCR5-2459A→G (rs1799987) are associated with recurrent hepatitis B in liver transplantation for hepatitis B virus infection-related end stage liver disease.METHODS:A total of 185 transplant recipients were enrolled in this study.The genomic DNA was extracted from whole blood,the copy number of the CCL3L1 gene was determined by a quantitative real-time PCR based assay,CCR5Δ32 was detected by a sizing PCR method,and a single-nucleotide polymorphism in CCR5-2459 was detected by restriction fragment length polymorphism PCR.RESULTS:No CCR5Δ32 mutation was detected in any of the individuals from China.Neither copy number variation nor polymorphism in CCR5-2459 was associated with post-transplant reinfection with hepatitis B virus.However,patients with fewer copies (<4) of the CCL3L1 gene compared with the population median in combination with the CCR5G allele had a significantly higher risk for recurrent hepatitis B (odds ratio=1.93,95% CI:1.00-3.69;P=0.047).CONCLUSION:Patients possessing the compound decreased functional genotype of both CCL3L1 and CCR5 genes might be more likely to have recurrence of hepatitis B after transplantation.展开更多
This paper presents observations on the WAAS L1 and L5 signals quality and their impact on the robustness of the navigation solution by quantifying the contributions of each broadcasted differential correction. This w...This paper presents observations on the WAAS L1 and L5 signals quality and their impact on the robustness of the navigation solution by quantifying the contributions of each broadcasted differential correction. This work is undertaken with the intent of defining performance benefits of L5 by dual frequency WAAS users and is to provide useful material for Minimum Operational Performance Standard (MOPS) development. In this perspective, a study of the WAAS signal characteristics is first carried out. The information gathered is then used to compare various GPS solutions in terms of frequency diversity, satellite diversity, pseudorange noise and different signal corrections and their impacts. These solutions are compared against a reference standalone GPS solution. All statistics are computed with respect to a post-processed Novatel Waypoint Real-Time Kinematics (RTK) GPS L1/L2 semi-codeless static solution, considered as the reference. A discussion on some simplifications with respect to specifications (i.e. MOPS) that could be considered by receiver manufacturers closes the paper. It is confirmed that the current WAAS navigation message definition is the same on both the L1 and L5 frequencies, the latter further being Manchester coded, thus avoiding data ambiguity. The +5 dB SNR on L5 has minor impacts in terms of reliability and continuous availability in the presented scenarios, but would become especially beneficial in hostile environments, despite a greater number of pulsed interferers. Another demonstration is that the WAAS message varies slightly from one WAAS satellite to another, even if corrections are generated centrally. Finally, it is observed that WAAS and GPS signals pseudorange noise are comparable on a “per frequency” basis.展开更多
文摘目的评估在骨质疏松条件下,行L5/S1节段斜外侧椎间融合术(oblique lateral interbody fusion at L5/S1,OLIF51)及其联合双侧皮质骨轨迹螺钉(cortical bone trajectory screw,CBT)和双侧椎弓根螺钉(bilateral pedicle screw,BPS)的生物力学性能。方法招募1名健康青年男性作为志愿者,获得其腰骶椎三维CT数据,在有限元分析软件中完成L4~S1三维模型,采用前路钛板(titanium plate,TP)固定的OLIF51手术模型、OLIF51+CBT和OLIF51+BPS手术模型的构建,分别命名为A、B、C、D模型。通过赋值、设定条件、施加载荷,分析不同条件下的生物力学特性。结果顺利完成4种有限元模型的构建。4种模型在所有运动中的平均活动度(range of motion,ROM)变化趋势为A模型>B模型>C模型>D模型;其中,与A模型相比,B模型降幅为84.21%~94.42%,C模型降幅为88.12%~96.40%,D模型降幅为90.07%~96.49%(P均<0.05);与B模型相比,C模型降幅为7.41%~52.38%,D模型降幅为27.78%~58.33%(P均<0.05)。3种手术模型在所有运动中的融合器(Cage)平均最大应力变化趋势为B模型>C模型>D模型;其中,与B模型相比,C模型降幅为12.89%~57.62%,D模型降幅为36.43%~73.11%;D模型和C模型相比,除左侧弯外差异均有统计学意义(P均<0.05);D模型降幅为21.83%~37.67%。3种手术模型在所有运动中的内固定平均最大应力变化趋势为B模型>C模型>D模型;与B模型相比,C模型降幅为3.55%~65.47%,D模型降幅为18.58%~84.41%;CBT应力大于BPS应力(P<0.05)。结论在OLIF51手术中,补充后路内固定可以增强融合节段的稳定性并减轻TP上的应力。不建议对骨质疏松症患者单独进行OLIF51手术,使用BPS辅助固定可达到最佳生物力学特性。接受CBT辅助内固定的患者术后需要佩戴支具,并尽量避免融合部位的右侧弯曲运动。
文摘目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDKAL1基因rs7756992位点A>G多态性与T2DM易感性的病例对照研究,以病例组与对照组CDKAL1基因rs7756992位点各种基因模型的比值比(OR)及其95%置信区间(CI)为效应指标进行meta分析,并根据研究人群种族不同进行亚组分析。结果本研究共纳入15篇文献,T2DM组和对照组病例数分别为24 315例和35 132例。Meta分析显示,CDKAL1基因rs7756992位点A>G多态性与T2DM易感性有关联[等位基因模式(G vs A):OR=1.171,95%CI1.122~1.223,P<0.001;共显性模式(GG vs AA):OR=1.380,95%CI1.258~1.515,P<0.001;共显性模式(AG vs AA):OR=1.131,95%CI 1.089~1.176,P<0.001;显性模式(AG+GG vs AA):OR=1.168,95%CI 1.101~1.240,P<0.001;隐性模式(GG vs AA+AG):OR=1.343,95%CI 1.282~1.405,P<0.001]。亚组分析显示,亚洲人群和白种人群中携带CDKAL1基因rs7756992位点G等位基因的人群发生T2DM的风险增加(P<0.05);而非洲人群中携带CDKAL1基因rs7756992位点G等位基因与A等位基因的人群发生T2DM风险的差异无统计学意义。结论在亚洲人群及白种人群中CDKAL1基因rs7756992位点A>G等位基因的突变可能是T2DM发病的危险因素之一。
文摘目的:探究体外培养胰腺癌细胞系中L1CAM与α5-整合素产生促血管生成因子对内皮细胞血管生成方面的影响。方法:将重组质粒pc DNA3.1-L1CAM和α5-整合素小干扰RNA分别转入Patu8988和Capan-2胰腺癌细胞系上调和下调靶基因的表达。Western blot及实时定量PCR检测Patu8988及Capan-2胰腺癌细胞系中促血管生成因子[信号转导及转录激活因子3(signal transducers and activators of transcription3,STAT3)、磷酸化信号转导及转录因子3(phosphorylated signal transducers and activators of transcription 3,pSTAT3)、血管内皮生长因子-A(vascular endothelial growth factor-A,VEGF-A)、血管生成素2(angiopoietin-2,Ang-2)]表达的水平差异;血管生成实验检测改变L1CAM及α5-整合素表达水平后Patu8988和Capan-2胰腺癌细胞系上清液对体外血管生成的影响。结果:上调Patu8988及Capan-2胰腺癌细胞系中L1CAM的表达水平可促进pSTAT3、VEGF-A及Ang-2的mRNA及蛋白表达水平(P<0.01),并促进人脐静脉内皮细胞系(human umbilical vein endothelium cell,HUVEC)的完整血管形成(P<0.01)。而抑制Patu8988及Capan-2胰腺癌细胞系中的α5-整合素表达水平显著减少pSTAT3、VEGF-A及Ang-2的mRNA及蛋白表达水平(P<0.01),并明显削减了HUVEC的成管能力(P<0.01)。结论:体外培养胰腺癌细胞系中,L1CAM表达水平增加显著促进促血管生成因子表达和血管生成能力;而抑制α5-整合素的表达水平则可显著抑制促血管生成因子表达和成管能力。
基金supported by grants from the National Basic Research Program of China (973 Program) (2009CB522403)the National S&T Major Project (2008ZX10002-026)
文摘BACKGROUND:The genetic diversity of chemokines and chemokine receptors has been associated with the outcome of hepatitis B virus infection.The aim of this study was to evaluate whether the copy number variation in the CCL3L1 gene and the polymorphisms of CCR5Δ32 and CCR5-2459A→G (rs1799987) are associated with recurrent hepatitis B in liver transplantation for hepatitis B virus infection-related end stage liver disease.METHODS:A total of 185 transplant recipients were enrolled in this study.The genomic DNA was extracted from whole blood,the copy number of the CCL3L1 gene was determined by a quantitative real-time PCR based assay,CCR5Δ32 was detected by a sizing PCR method,and a single-nucleotide polymorphism in CCR5-2459 was detected by restriction fragment length polymorphism PCR.RESULTS:No CCR5Δ32 mutation was detected in any of the individuals from China.Neither copy number variation nor polymorphism in CCR5-2459 was associated with post-transplant reinfection with hepatitis B virus.However,patients with fewer copies (<4) of the CCL3L1 gene compared with the population median in combination with the CCR5G allele had a significantly higher risk for recurrent hepatitis B (odds ratio=1.93,95% CI:1.00-3.69;P=0.047).CONCLUSION:Patients possessing the compound decreased functional genotype of both CCL3L1 and CCR5 genes might be more likely to have recurrence of hepatitis B after transplantation.
文摘This paper presents observations on the WAAS L1 and L5 signals quality and their impact on the robustness of the navigation solution by quantifying the contributions of each broadcasted differential correction. This work is undertaken with the intent of defining performance benefits of L5 by dual frequency WAAS users and is to provide useful material for Minimum Operational Performance Standard (MOPS) development. In this perspective, a study of the WAAS signal characteristics is first carried out. The information gathered is then used to compare various GPS solutions in terms of frequency diversity, satellite diversity, pseudorange noise and different signal corrections and their impacts. These solutions are compared against a reference standalone GPS solution. All statistics are computed with respect to a post-processed Novatel Waypoint Real-Time Kinematics (RTK) GPS L1/L2 semi-codeless static solution, considered as the reference. A discussion on some simplifications with respect to specifications (i.e. MOPS) that could be considered by receiver manufacturers closes the paper. It is confirmed that the current WAAS navigation message definition is the same on both the L1 and L5 frequencies, the latter further being Manchester coded, thus avoiding data ambiguity. The +5 dB SNR on L5 has minor impacts in terms of reliability and continuous availability in the presented scenarios, but would become especially beneficial in hostile environments, despite a greater number of pulsed interferers. Another demonstration is that the WAAS message varies slightly from one WAAS satellite to another, even if corrections are generated centrally. Finally, it is observed that WAAS and GPS signals pseudorange noise are comparable on a “per frequency” basis.
