目的为提高男男性行为(men who have sex with men,MSM)人群艾滋病病毒(human immunodeficiency virus,HIV)发现率,特别是早期感染发现率,探索基于互联网平台和干血斑(dried blood spot,DBS)样本总核酸(total nucleic acid,TNA)检测的...目的为提高男男性行为(men who have sex with men,MSM)人群艾滋病病毒(human immunodeficiency virus,HIV)发现率,特别是早期感染发现率,探索基于互联网平台和干血斑(dried blood spot,DBS)样本总核酸(total nucleic acid,TNA)检测的新模式在MSM人群中的应用。方法采用滚雪球法招募600名感染状况未知且未经治疗的MSM。DBS的制备和HIV抗体快速检测(rapid test,RT)及TNA检测在北京市疾病预防控制中心进行。若采集到配对静脉血样本,实验室会对其进行抗体酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA);若ELISA筛查阳性,则继续进行HIV抗体免疫印迹(western blot,WB)检测。HIV TNA检测结果提交至互联网平台供被检测人进行查询。结果599份合格样本TNA阳性率为9.35%(56/599),其中RT阴性而TNA阳性百分比为21.4%(12/56)。在RT和TNA均阳性的44个样本中,收集了35份配对的全血样本,其ELISA阳性率为100%(35/35),WB阳性率为91.4%(32/35),WB可疑率为8.57%(3/35)。怀疑早期感染(RT阴性而TNA阳性)的12份样本中,1份配对全血样本ELISA筛查阴性。结论互联网平台加DBS HIV核酸检测可以及时发现高危人群中的感染者,为后续精准干预提供有力支持,对有效防控我国艾滋病疫情具有重要意义。展开更多
A study of nonlinear competitive adsorption equilibria of proteins is of fundamental importance in understanding the behavior of preparative chromatographic separation.This work describes the nonlinear binary protein ...A study of nonlinear competitive adsorption equilibria of proteins is of fundamental importance in understanding the behavior of preparative chromatographic separation.This work describes the nonlinear binary protein adsorption equilibria on ion exchangers by the statistical thermodynamic(ST)model.The single-component and binary protein adsorption isotherms of bovine hemoglobin(Hb)and bovine serum albumin(BSA)on SP Sepharose FF were determined by batch adsorption experiments in 0.05 mol/L sodium acetate buffer at three pH values(4.5,5.0 and 5.5)and three NaCl concentrations(0.05,0.10 and 0.15 mol/L)at pH 5.0.The ST model was found to depict the effects of pH and ionic strength on the single-component equilibria well,with model parameters depending on the pH and ionic strength.Moreover,the ST model gave acceptable fitting to the binary adsorption data with the fitted single-component model parameters,leading to the estimation of the binary ST model parameter.The effects of pH and ionic strength on the model parameters are reasonably interpreted by the electrostatic and thermodynamic theories.Results demonstrate the availability of the ST model for describing nonlinear competitive protein adsorption equilibria in the presence of two proteins.展开更多
文摘目的为提高男男性行为(men who have sex with men,MSM)人群艾滋病病毒(human immunodeficiency virus,HIV)发现率,特别是早期感染发现率,探索基于互联网平台和干血斑(dried blood spot,DBS)样本总核酸(total nucleic acid,TNA)检测的新模式在MSM人群中的应用。方法采用滚雪球法招募600名感染状况未知且未经治疗的MSM。DBS的制备和HIV抗体快速检测(rapid test,RT)及TNA检测在北京市疾病预防控制中心进行。若采集到配对静脉血样本,实验室会对其进行抗体酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA);若ELISA筛查阳性,则继续进行HIV抗体免疫印迹(western blot,WB)检测。HIV TNA检测结果提交至互联网平台供被检测人进行查询。结果599份合格样本TNA阳性率为9.35%(56/599),其中RT阴性而TNA阳性百分比为21.4%(12/56)。在RT和TNA均阳性的44个样本中,收集了35份配对的全血样本,其ELISA阳性率为100%(35/35),WB阳性率为91.4%(32/35),WB可疑率为8.57%(3/35)。怀疑早期感染(RT阴性而TNA阳性)的12份样本中,1份配对全血样本ELISA筛查阴性。结论互联网平台加DBS HIV核酸检测可以及时发现高危人群中的感染者,为后续精准干预提供有力支持,对有效防控我国艾滋病疫情具有重要意义。
基金supported by the National Natural Science Foundation of China(Grant No.20636040)the Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20050056001).
文摘A study of nonlinear competitive adsorption equilibria of proteins is of fundamental importance in understanding the behavior of preparative chromatographic separation.This work describes the nonlinear binary protein adsorption equilibria on ion exchangers by the statistical thermodynamic(ST)model.The single-component and binary protein adsorption isotherms of bovine hemoglobin(Hb)and bovine serum albumin(BSA)on SP Sepharose FF were determined by batch adsorption experiments in 0.05 mol/L sodium acetate buffer at three pH values(4.5,5.0 and 5.5)and three NaCl concentrations(0.05,0.10 and 0.15 mol/L)at pH 5.0.The ST model was found to depict the effects of pH and ionic strength on the single-component equilibria well,with model parameters depending on the pH and ionic strength.Moreover,the ST model gave acceptable fitting to the binary adsorption data with the fitted single-component model parameters,leading to the estimation of the binary ST model parameter.The effects of pH and ionic strength on the model parameters are reasonably interpreted by the electrostatic and thermodynamic theories.Results demonstrate the availability of the ST model for describing nonlinear competitive protein adsorption equilibria in the presence of two proteins.
