目的探讨血清肿瘤标志物癌胚抗原和糖类抗原在胃癌腹膜转移中的诊断价值,为胃癌腹膜转移的诊断提供理论依据。方法纳入2014年6月～2017年6月于乐山市人民医院肿瘤科诊治的68例胃癌患者,根据是否发生腹膜转移分为转移组(20例)与非转移组...目的探讨血清肿瘤标志物癌胚抗原和糖类抗原在胃癌腹膜转移中的诊断价值,为胃癌腹膜转移的诊断提供理论依据。方法纳入2014年6月～2017年6月于乐山市人民医院肿瘤科诊治的68例胃癌患者,根据是否发生腹膜转移分为转移组(20例)与非转移组(48例);手术或化疗前采用全自动免疫分析仪检测血清肿瘤标志物癌胚抗原(Carcinoembryonic antigen,CEA)、糖类抗原CA724、CA242、CA211、CA19-9、CA125水平,比较两组各检测指标血清水平、阳性率。进行Logistic回归分析,绘制受试者特征ROC曲线,比较联合检测以及各指标单独检测的诊断效能。结果转移组血清CEA、CA724、CA242、CA211、CA19-9、CA125水平均显著高于非转移组,差异均有统计学意义(P<0.05);转移组血清CA724、CA125、CA211阳性率显著高于非转移组,差异均有统计学意义(P<0.05),血清CEA、CA242、CA19-9阳性率差异无统计学意义(P>0.05);CA724、CA125、CA211联合诊断(Y1)与所有检测指标联合诊断(Y2)ROC曲线下面积(area under the cure,AUC)值均大于单项指标诊断(P<0.05)。结论单项指标中CA125诊断胃癌腹膜转移效能最高,其与CA724、CA211联合诊断可作为胃癌腹膜转移的有效诊断方式。展开更多
qnrS是质粒介导的喹诺酮类药物的耐药基因,通过保护DNA回旋酶活性从而降低宿主菌对喹诺酮类药物的敏感性。这种保护作用依赖于qnrS基因的表达水平,同时,qnrS的表达主要受喹诺酮类药物浓度的影响,且σ-D调控因子(regulator of sigma D,R...qnrS是质粒介导的喹诺酮类药物的耐药基因,通过保护DNA回旋酶活性从而降低宿主菌对喹诺酮类药物的敏感性。这种保护作用依赖于qnrS基因的表达水平,同时,qnrS的表达主要受喹诺酮类药物浓度的影响,且σ-D调控因子(regulator of sigma D,Rsd)也参与该基因的表达调控。qnrS基因在沙门氏菌中高度流行,并且是大肠埃希氏菌中质粒介导的喹诺酮类耐药基因的优势基因。qnrS可以在细菌间进行传播,或与其他耐药基因共存于同一质粒上发生共转移,从而导致多重耐药的发生。论文对qnrS基因的发现、表达及其调控机制、在沙门氏菌和大肠埃希氏菌中的流行及传播的研究进展进行综述,以期为控制qnrS基因介导的耐药性提供参考。展开更多
The March 28,2025 Myanmar earthquake generated ground shaking that was perceptible throughout Myanmar and adjacent regions.This study simulated three-component ground motions across the affected region using an improv...The March 28,2025 Myanmar earthquake generated ground shaking that was perceptible throughout Myanmar and adjacent regions.This study simulated three-component ground motions across the affected region using an improved stochastic finite-fault method to systematically assess seismic impacts.Observed near-field recordings at MM.NGU station was used to determine the reliability of the theoretically derived stress drop as input for simulation.Far-field recordings constrained the frequency-dependent S-wave quality factors(Q(f)=283.305f^(0.588))for anelastic attenuation modeling.Comparisons of peak accelerations between simulation and empirical ground-motion models showed good agreement at moderate-to-large distances.However,lower near-fault simulations indicate a weaker-than-average source effect.Analysis of simulated instrumental seismic intensity revealed key patterns.Maximum intensity(Ⅹ)occurred in isolated patches within the ruptured fault projection,correlating with shallow high-slip areas.TheⅨ-intensity zone formed a north-south elongated band centered on fault projection.Significant asymmetry inⅧ-intensity distribution perpendicular to the fault strike was observed,with a wider western extension attributed to lower shear-wave velocities west of the fault.Supershear rupture behavior enhanced ground motions,expanding intensity ranges by~20%compared to sub-shear rupture.This study reveals the integrated effects of fault geometry,slip spatial distribution,rupture velocity,and site condition in governing ground motion patterns.展开更多
文摘目的探讨血清肿瘤标志物癌胚抗原和糖类抗原在胃癌腹膜转移中的诊断价值,为胃癌腹膜转移的诊断提供理论依据。方法纳入2014年6月～2017年6月于乐山市人民医院肿瘤科诊治的68例胃癌患者,根据是否发生腹膜转移分为转移组(20例)与非转移组(48例);手术或化疗前采用全自动免疫分析仪检测血清肿瘤标志物癌胚抗原(Carcinoembryonic antigen,CEA)、糖类抗原CA724、CA242、CA211、CA19-9、CA125水平,比较两组各检测指标血清水平、阳性率。进行Logistic回归分析,绘制受试者特征ROC曲线,比较联合检测以及各指标单独检测的诊断效能。结果转移组血清CEA、CA724、CA242、CA211、CA19-9、CA125水平均显著高于非转移组,差异均有统计学意义(P<0.05);转移组血清CA724、CA125、CA211阳性率显著高于非转移组,差异均有统计学意义(P<0.05),血清CEA、CA242、CA19-9阳性率差异无统计学意义(P>0.05);CA724、CA125、CA211联合诊断(Y1)与所有检测指标联合诊断(Y2)ROC曲线下面积(area under the cure,AUC)值均大于单项指标诊断(P<0.05)。结论单项指标中CA125诊断胃癌腹膜转移效能最高,其与CA724、CA211联合诊断可作为胃癌腹膜转移的有效诊断方式。
文摘qnrS是质粒介导的喹诺酮类药物的耐药基因,通过保护DNA回旋酶活性从而降低宿主菌对喹诺酮类药物的敏感性。这种保护作用依赖于qnrS基因的表达水平,同时,qnrS的表达主要受喹诺酮类药物浓度的影响,且σ-D调控因子(regulator of sigma D,Rsd)也参与该基因的表达调控。qnrS基因在沙门氏菌中高度流行,并且是大肠埃希氏菌中质粒介导的喹诺酮类耐药基因的优势基因。qnrS可以在细菌间进行传播,或与其他耐药基因共存于同一质粒上发生共转移,从而导致多重耐药的发生。论文对qnrS基因的发现、表达及其调控机制、在沙门氏菌和大肠埃希氏菌中的流行及传播的研究进展进行综述,以期为控制qnrS基因介导的耐药性提供参考。
基金National Key R&D Program of China under Grant No.2022YFC3003601。
文摘The March 28,2025 Myanmar earthquake generated ground shaking that was perceptible throughout Myanmar and adjacent regions.This study simulated three-component ground motions across the affected region using an improved stochastic finite-fault method to systematically assess seismic impacts.Observed near-field recordings at MM.NGU station was used to determine the reliability of the theoretically derived stress drop as input for simulation.Far-field recordings constrained the frequency-dependent S-wave quality factors(Q(f)=283.305f^(0.588))for anelastic attenuation modeling.Comparisons of peak accelerations between simulation and empirical ground-motion models showed good agreement at moderate-to-large distances.However,lower near-fault simulations indicate a weaker-than-average source effect.Analysis of simulated instrumental seismic intensity revealed key patterns.Maximum intensity(Ⅹ)occurred in isolated patches within the ruptured fault projection,correlating with shallow high-slip areas.TheⅨ-intensity zone formed a north-south elongated band centered on fault projection.Significant asymmetry inⅧ-intensity distribution perpendicular to the fault strike was observed,with a wider western extension attributed to lower shear-wave velocities west of the fault.Supershear rupture behavior enhanced ground motions,expanding intensity ranges by~20%compared to sub-shear rupture.This study reveals the integrated effects of fault geometry,slip spatial distribution,rupture velocity,and site condition in governing ground motion patterns.
