In order to investigate the influence of functional polymorphisms of macrophage migration inhibitory factor （M/F）, Fcg receptors CD16A （FCGR3A） and CD32A （FCGR2A） genes on susceptibility to pulmonary tuberculos...In order to investigate the influence of functional polymorphisms of macrophage migration inhibitory factor （M/F）, Fcg receptors CD16A （FCGR3A） and CD32A （FCGR2A） genes on susceptibility to pulmonary tuberculosis （PTB） in the Moroccan population, we analyzed 123 patients with PTB and 154 healthy controls. The genotyping for M/F-173 （G/C） （rs755622）, FCGR2A- 131H/R （rs 1801274） and FCGR3A-158V/F （rs396991） was carried out using TaqMan SNP Genotyping Assay method. We found a statistically significant in- crease of the MIF-173CC homozygote genotype and M/F-173＂C allele frequencies in PTB patients compared with healthy controls （17.07% versus 5.84%, P = 0.003; and 35.37% versus 26.30%, P = 0.02; respectively）. In contrast, no association was observed between FCGR2A-131H/R and FCGR3A-158V/F polymorphisms and tuberculosis disease. Our finding suggests that M/F-173℃ variant may play an important role in the development of active tuberculosis.展开更多
In this work,anisotropic fatigue crack growth rate(FCGR)behaviour in a hot-rolled Mg-3wt%Al-0.5wt%Ce alloy was investigated using compact tension(CT)specimens with notch(an)parallel to the rolling direction(RD)and tra...In this work,anisotropic fatigue crack growth rate(FCGR)behaviour in a hot-rolled Mg-3wt%Al-0.5wt%Ce alloy was investigated using compact tension(CT)specimens with notch(an)parallel to the rolling direction(RD)and transverse direction(TD).The FCGR tests were conducted at a constant load ratio(R=0.1)and maximum stress intensity factor(KMax=15.6 MPa√m)to investigate the crack closure effect.For both constant R and KMax conditions:(i)the load-displacement curves for every loading cycle were linear for a_(n)∥ to RD and TD,indicating no crack closure;(ii)the FCGR was found to be lower for an∥RD than an∥TD over the entire stress intensity factor range(△K).The hot-rolled sample contained long-aligned Al11Ce3 intermetallic phase within grain boundaries that are elongated along RD.During the FCGR test,{10.12}<10.11>extension twins(ET)with lamellae∼⊥and c-axis∼∥to these elongated intermetallics along RD developed irrespective of the notch orientation.During the loading cycle,these intermetallics along RD generate back-stresses,reducing the in-plane tensile stress∼||and∼⊥to crack-tip to∼0 for a_(n)∥to RD and TD,respectively.Hence,lenticular ET∼||⊥and∼||,with c-axis∼||and∼⊥to crack path activates,leading to trans and inter lamellar crack for anto RD and TD,respectively,and anisotropic FCGR.Translamellar crack in a_(n)∥RD reduces the FCGR due to plastic energy dissipation as perceived by comparatively more geometrically necessary boundaries(GNBs).On the other hand,faster FCGR was obtained for a_(n)∥TD due to interlamellar cracking.Thus,the crack growth through the matrix-ET interfaces was favoured due to strain incompatibility.The Fractography for a_(n)∥RD shows smaller elongated grooves along crack propagation,which indicates crack arrest.However,larger elongated grooves for a_(n)||TD indicated easy crack propagation due to favourable interlamellar crack.展开更多
Single-edged notched tension （SENT） specimen is used to study the fatigue crack growth rate （FCGR） behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displace...Single-edged notched tension （SENT） specimen is used to study the fatigue crack growth rate （FCGR） behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement （CMOD） vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,展开更多
目的研究免疫球蛋白γFc段受体1b(Fc fragment of IgG receptor 1b,FCGR1B)基因转录水平检测对活动性结核病的诊断价值。方法2018年2—9月,收集解放军总医院第八医学中心活动性结核病患者、结核潜伏感染者(LTBI)、治愈结核病患者、健康...目的研究免疫球蛋白γFc段受体1b(Fc fragment of IgG receptor 1b,FCGR1B)基因转录水平检测对活动性结核病的诊断价值。方法2018年2—9月,收集解放军总医院第八医学中心活动性结核病患者、结核潜伏感染者(LTBI)、治愈结核病患者、健康人和肺炎患者的外周血,分离外周血单个核细胞(PBMC),提取总RNA并反转录为cDNA,实时荧光定量聚合酶链式反应(QPCR)检测PBMC中FCGR1B基因mRNA的相对表达量,非参数检验比较活动性结核病和对照组FCGR1B基因mRNA的表达差异、相关性分析FCGR1B基因mRNA的表达与结核病病情和感染指标的关系,受试者工作特征曲线(ROC)评估FCGR1B基因转录水平检测在活动性结核病诊断中的价值。结果与非结核组(包括LTBI、健康人、治愈结核和肺炎患者)相比,活动性结核病患者PBMC中FCGR1B基因mRNA的表达较高(u=2081,P<0.001);结核患者的载菌量越多,FCGR1B基因mRNA的表达越高(H=12.35,P=0.015),与C反应蛋白(CRP)的表达显著相关(r=0.30,P=0.008);FCGR1B基因mRNA鉴别活动性结核病的曲线下面积(AUC)为0.849,诊断的敏感度和特异度分别为71.43%和84.17%,FCGR1B基因mRNA鉴别肺外结核的AUC为0.906,诊断的敏感度和特异度分别为84.62%和91.89%。结论FCGR1B基因mRNA是潜在的活动性结核病分子诊断标志物。展开更多
基金supported in part by the grants SAF06-00398/CTS1880,Spainin another part by the National Institute of Hygiene,Rabat,Morocco
文摘In order to investigate the influence of functional polymorphisms of macrophage migration inhibitory factor （M/F）, Fcg receptors CD16A （FCGR3A） and CD32A （FCGR2A） genes on susceptibility to pulmonary tuberculosis （PTB） in the Moroccan population, we analyzed 123 patients with PTB and 154 healthy controls. The genotyping for M/F-173 （G/C） （rs755622）, FCGR2A- 131H/R （rs 1801274） and FCGR3A-158V/F （rs396991） was carried out using TaqMan SNP Genotyping Assay method. We found a statistically significant in- crease of the MIF-173CC homozygote genotype and M/F-173＂C allele frequencies in PTB patients compared with healthy controls （17.07% versus 5.84%, P = 0.003; and 35.37% versus 26.30%, P = 0.02; respectively）. In contrast, no association was observed between FCGR2A-131H/R and FCGR3A-158V/F polymorphisms and tuberculosis disease. Our finding suggests that M/F-173℃ variant may play an important role in the development of active tuberculosis.
基金support provided by the Science and Engineering Research Board(Ref.no.:ECR/2016/000125)Department of Science and Technology,Government of India.SB acknowledges the funding by Alexander von Humboldt Foundation,Germany.
文摘In this work,anisotropic fatigue crack growth rate(FCGR)behaviour in a hot-rolled Mg-3wt%Al-0.5wt%Ce alloy was investigated using compact tension(CT)specimens with notch(an)parallel to the rolling direction(RD)and transverse direction(TD).The FCGR tests were conducted at a constant load ratio(R=0.1)and maximum stress intensity factor(KMax=15.6 MPa√m)to investigate the crack closure effect.For both constant R and KMax conditions:(i)the load-displacement curves for every loading cycle were linear for a_(n)∥ to RD and TD,indicating no crack closure;(ii)the FCGR was found to be lower for an∥RD than an∥TD over the entire stress intensity factor range(△K).The hot-rolled sample contained long-aligned Al11Ce3 intermetallic phase within grain boundaries that are elongated along RD.During the FCGR test,{10.12}<10.11>extension twins(ET)with lamellae∼⊥and c-axis∼∥to these elongated intermetallics along RD developed irrespective of the notch orientation.During the loading cycle,these intermetallics along RD generate back-stresses,reducing the in-plane tensile stress∼||and∼⊥to crack-tip to∼0 for a_(n)∥to RD and TD,respectively.Hence,lenticular ET∼||⊥and∼||,with c-axis∼||and∼⊥to crack path activates,leading to trans and inter lamellar crack for anto RD and TD,respectively,and anisotropic FCGR.Translamellar crack in a_(n)∥RD reduces the FCGR due to plastic energy dissipation as perceived by comparatively more geometrically necessary boundaries(GNBs).On the other hand,faster FCGR was obtained for a_(n)∥TD due to interlamellar cracking.Thus,the crack growth through the matrix-ET interfaces was favoured due to strain incompatibility.The Fractography for a_(n)∥RD shows smaller elongated grooves along crack propagation,which indicates crack arrest.However,larger elongated grooves for a_(n)||TD indicated easy crack propagation due to favourable interlamellar crack.
基金supported by University of Engineering and Technology, Taxila
文摘Single-edged notched tension （SENT） specimen is used to study the fatigue crack growth rate （FCGR） behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement （CMOD） vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,
文摘目的研究免疫球蛋白γFc段受体1b(Fc fragment of IgG receptor 1b,FCGR1B)基因转录水平检测对活动性结核病的诊断价值。方法2018年2—9月,收集解放军总医院第八医学中心活动性结核病患者、结核潜伏感染者(LTBI)、治愈结核病患者、健康人和肺炎患者的外周血,分离外周血单个核细胞(PBMC),提取总RNA并反转录为cDNA,实时荧光定量聚合酶链式反应(QPCR)检测PBMC中FCGR1B基因mRNA的相对表达量,非参数检验比较活动性结核病和对照组FCGR1B基因mRNA的表达差异、相关性分析FCGR1B基因mRNA的表达与结核病病情和感染指标的关系,受试者工作特征曲线(ROC)评估FCGR1B基因转录水平检测在活动性结核病诊断中的价值。结果与非结核组(包括LTBI、健康人、治愈结核和肺炎患者)相比,活动性结核病患者PBMC中FCGR1B基因mRNA的表达较高(u=2081,P<0.001);结核患者的载菌量越多,FCGR1B基因mRNA的表达越高(H=12.35,P=0.015),与C反应蛋白(CRP)的表达显著相关(r=0.30,P=0.008);FCGR1B基因mRNA鉴别活动性结核病的曲线下面积(AUC)为0.849,诊断的敏感度和特异度分别为71.43%和84.17%,FCGR1B基因mRNA鉴别肺外结核的AUC为0.906,诊断的敏感度和特异度分别为84.62%和91.89%。结论FCGR1B基因mRNA是潜在的活动性结核病分子诊断标志物。
