目的利用正电子核素^124I对人源化抗程序性死亡蛋白配体-1(programmed death ligand-1,PD-L1)的重链抗体的Fab段Nb1756进行标记并合成分子探针,通过系列基础实验评价该分子探针对于PD-L1检测的有效性和特异性。方法采用2-溴代丁二酰亚...目的利用正电子核素^124I对人源化抗程序性死亡蛋白配体-1(programmed death ligand-1,PD-L1)的重链抗体的Fab段Nb1756进行标记并合成分子探针,通过系列基础实验评价该分子探针对于PD-L1检测的有效性和特异性。方法采用2-溴代丁二酰亚胺标记^124I,获得^124I-Nb1756分子探针并进行质量控制,分析其标记率、放射化学纯度和体内外稳定性。建立结肠癌LOVO荷瘤裸鼠模型,借助Micro-PET/CT设备,评价^124I-Nb1756在上述模型动物体内和肿瘤中的分布及代谢情况。结果^124I-Nb1756标记率>99%,放射化学纯度>99%,放射化学产率为75%~80%,比活度约为11.1 MBq/nmol。Micro-PET/CT显示该分子探针在肿瘤病灶中特异性摄取,肿瘤病灶中分子探针的聚集随着时间的延长而增加。结论^124I-Nb1756分子探针制备过程简便且标记率高,该分子探针能够特异靶向肿瘤病灶中的PD-L1,并可对肿瘤进行长时间显像观察,可为选择肿瘤治疗方案提供一定帮助。展开更多
By analyzing the grille mechanical property, tensile strength and creep tests, and the fi eld tests, we investigated the characteristics and the reinforcement principle of multidirectional geogrid, and obtained the ef...By analyzing the grille mechanical property, tensile strength and creep tests, and the fi eld tests, we investigated the characteristics and the reinforcement principle of multidirectional geogrid, and obtained the effect factors of grid characteristics, load and time curve and the shear stress of grille and sand interface. The reinforcement effect of geogrid in combination of typical project cases was illustrated and the following conclusions were presented. Firstly, multidirectional geogrid has ability to resist structural deformation, node distortion or soil slippage under stress, and can effectively disperse load. Secondly, with the increase of tensile rate, grille intensity increases and the creep value also increases with the increase of load. Thirdly, the frictional resistance balance between horizontal thrust of damaged zone and reinforced soil in stable region can avoid slope failure due to excessive lateral deformation. Fourthly, the multidirectional geogrid is able to withstand the vertical, horizontal and diagonal forces by combing them well with three-dimensional orientation, realizing the purpose of preventing soil erosion and slope reinforcement, which has a wide range of application and development in engineering fi eld.展开更多
Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bend...Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bending moment for high-position,hard and thick strata were constructed by theoretical analysis,and the initial breaking position of high-position,hard and thick strata was also analyzed.The breaking process and evolution law of mining stress in high-position,hard and thick strata were studied by similar material simulation tests.Studies show that:due to the foundation deformation effect of the lower strata,the initial break position in high-position,hard thick layers is in the middle of goaf;vertical tension fractures first occur under the middle surface,then tilt tension fractures form at both sides and a non-uniform thickness of the fracture structure forms and produces subsidence deformation;behind the coal wall tilt fractures extend and eventually complete the migration.Mining stress produces obvious changes before and after the breakage of the high,hard and thick stratum;high stress concentration forms in front of the coal wall before breakage and fracture stress concentration significantly reduces after migration.Coal seam mining under high-position,hard thick strata can easily induce dynamic phenomena.展开更多
After the 18th National Congress of the Communist Party of China(CPC)in 2012,socialism with Chinese characteristics entered a new era,marking a new chapter in the two great miracles of China-rapid economic growth and ...After the 18th National Congress of the Communist Party of China(CPC)in 2012,socialism with Chinese characteristics entered a new era,marking a new chapter in the two great miracles of China-rapid economic growth and enduring social stability.In the Report to the 20th National Congress of the CPC,General Secretary Xi Jinping summarized the great changes of the past decade in one profound statement:The CPC Central Committee brought together the entire Party,the military.展开更多
目的探究分析高州市2023—2024年疑似预防接种异常反应(adverse events following immunization,AEFI)监测结果。方法通过中国疾病预防控制信息系统检索收集2023年1月—2024年3月期间的预防接种AEFI监测报告数据,对AEFI监测结果予以描...目的探究分析高州市2023—2024年疑似预防接种异常反应(adverse events following immunization,AEFI)监测结果。方法通过中国疾病预防控制信息系统检索收集2023年1月—2024年3月期间的预防接种AEFI监测报告数据,对AEFI监测结果予以描述性分析。结果2023年1月—2024年3月高州市接种疫苗出现245例AFEI,平均每年报告发生率为15.22/10万剂次。一般反应占比80.00%(196/245)、异常反应占比10.61%(26/245),未出现接种事故以及疫苗质量事故。AFEI个案中男女性别比例为1.36∶1;以<1岁者发生AEFI最多,10~15岁者发生AEFI最少。接种至出现症状的间隔时间以<1 d发生AEFI最多。AFEI报告涉及疫苗36种,前三位是百白破疫苗(无细胞)、麻腮风疫苗、13价肺炎疫苗;报告发生率前三位是带状疱疹疫苗(CHO细胞)、ACYW135流脑疫苗(结合)、冻干甲肝减毒活疫苗;引起一般反应的疫苗前两位是带状疱疹疫苗(CHO细胞)、ACYW135流脑疫苗(结合);引起异常反应的疫苗前两位是麻腮风疫苗、23价肺炎球菌疫苗。结论2023年1月—2024年3月高州市AEFI监测结果符合监测要求,且能在一定程度上说明预防接种疫苗的安全性,但需关注AFEI报告中发生率较高的疫苗,并需加强高州市AEFI监测,提升AEFI监测的及时性与灵敏度。展开更多
文摘目的利用正电子核素^124I对人源化抗程序性死亡蛋白配体-1(programmed death ligand-1,PD-L1)的重链抗体的Fab段Nb1756进行标记并合成分子探针,通过系列基础实验评价该分子探针对于PD-L1检测的有效性和特异性。方法采用2-溴代丁二酰亚胺标记^124I,获得^124I-Nb1756分子探针并进行质量控制,分析其标记率、放射化学纯度和体内外稳定性。建立结肠癌LOVO荷瘤裸鼠模型,借助Micro-PET/CT设备,评价^124I-Nb1756在上述模型动物体内和肿瘤中的分布及代谢情况。结果^124I-Nb1756标记率>99%,放射化学纯度>99%,放射化学产率为75%~80%,比活度约为11.1 MBq/nmol。Micro-PET/CT显示该分子探针在肿瘤病灶中特异性摄取,肿瘤病灶中分子探针的聚集随着时间的延长而增加。结论^124I-Nb1756分子探针制备过程简便且标记率高,该分子探针能够特异靶向肿瘤病灶中的PD-L1,并可对肿瘤进行长时间显像观察,可为选择肿瘤治疗方案提供一定帮助。
基金Funded by the National Natural Science Foundation of China(41372289)the Shandong Province Higher Educational Science and Technology Program(12LH03)+1 种基金the China's Post-doctoral Science Fund(2012M521365)the SDUST Research Fund
文摘By analyzing the grille mechanical property, tensile strength and creep tests, and the fi eld tests, we investigated the characteristics and the reinforcement principle of multidirectional geogrid, and obtained the effect factors of grid characteristics, load and time curve and the shear stress of grille and sand interface. The reinforcement effect of geogrid in combination of typical project cases was illustrated and the following conclusions were presented. Firstly, multidirectional geogrid has ability to resist structural deformation, node distortion or soil slippage under stress, and can effectively disperse load. Secondly, with the increase of tensile rate, grille intensity increases and the creep value also increases with the increase of load. Thirdly, the frictional resistance balance between horizontal thrust of damaged zone and reinforced soil in stable region can avoid slope failure due to excessive lateral deformation. Fourthly, the multidirectional geogrid is able to withstand the vertical, horizontal and diagonal forces by combing them well with three-dimensional orientation, realizing the purpose of preventing soil erosion and slope reinforcement, which has a wide range of application and development in engineering fi eld.
基金financially supported by the National Natural Science Foundation of China (No.51374139)the Natural Science Foundation of Shandong Province (No.ZR2013EEM018)the Scientific Research Innovation Team Support Plan of Shandong University of Science and Technology
文摘Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bending moment for high-position,hard and thick strata were constructed by theoretical analysis,and the initial breaking position of high-position,hard and thick strata was also analyzed.The breaking process and evolution law of mining stress in high-position,hard and thick strata were studied by similar material simulation tests.Studies show that:due to the foundation deformation effect of the lower strata,the initial break position in high-position,hard thick layers is in the middle of goaf;vertical tension fractures first occur under the middle surface,then tilt tension fractures form at both sides and a non-uniform thickness of the fracture structure forms and produces subsidence deformation;behind the coal wall tilt fractures extend and eventually complete the migration.Mining stress produces obvious changes before and after the breakage of the high,hard and thick stratum;high stress concentration forms in front of the coal wall before breakage and fracture stress concentration significantly reduces after migration.Coal seam mining under high-position,hard thick strata can easily induce dynamic phenomena.
文摘After the 18th National Congress of the Communist Party of China(CPC)in 2012,socialism with Chinese characteristics entered a new era,marking a new chapter in the two great miracles of China-rapid economic growth and enduring social stability.In the Report to the 20th National Congress of the CPC,General Secretary Xi Jinping summarized the great changes of the past decade in one profound statement:The CPC Central Committee brought together the entire Party,the military.
文摘目的探究分析高州市2023—2024年疑似预防接种异常反应(adverse events following immunization,AEFI)监测结果。方法通过中国疾病预防控制信息系统检索收集2023年1月—2024年3月期间的预防接种AEFI监测报告数据,对AEFI监测结果予以描述性分析。结果2023年1月—2024年3月高州市接种疫苗出现245例AFEI,平均每年报告发生率为15.22/10万剂次。一般反应占比80.00%(196/245)、异常反应占比10.61%(26/245),未出现接种事故以及疫苗质量事故。AFEI个案中男女性别比例为1.36∶1;以<1岁者发生AEFI最多,10~15岁者发生AEFI最少。接种至出现症状的间隔时间以<1 d发生AEFI最多。AFEI报告涉及疫苗36种,前三位是百白破疫苗(无细胞)、麻腮风疫苗、13价肺炎疫苗;报告发生率前三位是带状疱疹疫苗(CHO细胞)、ACYW135流脑疫苗(结合)、冻干甲肝减毒活疫苗;引起一般反应的疫苗前两位是带状疱疹疫苗(CHO细胞)、ACYW135流脑疫苗(结合);引起异常反应的疫苗前两位是麻腮风疫苗、23价肺炎球菌疫苗。结论2023年1月—2024年3月高州市AEFI监测结果符合监测要求,且能在一定程度上说明预防接种疫苗的安全性,但需关注AFEI报告中发生率较高的疫苗,并需加强高州市AEFI监测,提升AEFI监测的及时性与灵敏度。
