The dynamics of transportation,accumulation,disappearance and distribution of 60Co in a simulated aquatic-terrestrial ecosystem was studied by isotope-tracer technique. In the aquatic system,60Co was transported and t...The dynamics of transportation,accumulation,disappearance and distribution of 60Co in a simulated aquatic-terrestrial ecosystem was studied by isotope-tracer technique. In the aquatic system,60Co was transported and transformed via depositing,coupling with ions and adsorption. The absorption resulted in the redistribution and accumulation of 60Co in each compartment of the system. Specific activities of 60Co in water started sharply and gently decreased. The sediment accumulated a large amount of 60Co by adsorption and ion exchange. The hornwort (Ceralophyllum demersum) could also adsorb a large amount of 60Co in a short time,because of its large specific surface area. Fish (Carassius auratus) and snail (Bellamya purificata) had a poor capacity of adsorbing 60Co. The distribution of 60Co in the fish was mainly in the viscera,and the amount of 60Co in the snail flesh was greater than that in the shell. The amount of 60Co in individual compartment in the system was changed with time. The highest specific activity of 60Co in the bean of the terrestrial system remained in the root nodule.展开更多
目的分析穿桌侧位片(CL)与骨盆正位片(AP)测量髋臼假体前倾角的一致性及可靠性差异。方法回顾性分析2014年5月至2017年7月期间于中山大学孙逸仙纪念医院接受单侧初次全髋关节置换术并于术后第1天进行了CL及AP拍摄的患者,排除有脊柱或骨...目的分析穿桌侧位片(CL)与骨盆正位片(AP)测量髋臼假体前倾角的一致性及可靠性差异。方法回顾性分析2014年5月至2017年7月期间于中山大学孙逸仙纪念医院接受单侧初次全髋关节置换术并于术后第1天进行了CL及AP拍摄的患者,排除有脊柱或骨盆相关疾病或手术史及一期行双侧髋关节置换术的患者,共纳入100例,其中男46例,女54例,平均年龄(54±13)岁。3名独立的对患者资料不知情的测量者分别在CL及AP上进行髋臼杯前倾角测量,使用组内相关系数(ICC)和95%置信区间(CI)评估AP和CL测量值的可靠性,均值、标准差和95%置信区间(CI)用于对两组测量值进行统计描述。结果CL与AP均具有较高的组内和组间ICC,但CL相对更高。CL平均髋臼假体前倾为(17.5±5.3)°,AP为(15.9±9.7)°;CL与AP均值的ICC=0.723[95%CI(0.588,0.813)],差值几乎均在95%一致性界限内(-15.9~12.7),平均差值为-1.6。差值较大的26例中有17例术后30 d AP上闭孔高度及髋臼前倾角较术后1 d及术前发生较大变化。另外发现一例AP显示倾斜方向不明,而CL显示倾斜方向与CT一致。结论CL与AP测量髋臼杯前倾角具有良好的一致性,CL在测量可靠性、臼杯倾斜方向判定上更具有优势。两种方法测量时均需考虑到骨盆前倾角的影响。展开更多
基金National Natural Science Foundation of China (39570149)
文摘The dynamics of transportation,accumulation,disappearance and distribution of 60Co in a simulated aquatic-terrestrial ecosystem was studied by isotope-tracer technique. In the aquatic system,60Co was transported and transformed via depositing,coupling with ions and adsorption. The absorption resulted in the redistribution and accumulation of 60Co in each compartment of the system. Specific activities of 60Co in water started sharply and gently decreased. The sediment accumulated a large amount of 60Co by adsorption and ion exchange. The hornwort (Ceralophyllum demersum) could also adsorb a large amount of 60Co in a short time,because of its large specific surface area. Fish (Carassius auratus) and snail (Bellamya purificata) had a poor capacity of adsorbing 60Co. The distribution of 60Co in the fish was mainly in the viscera,and the amount of 60Co in the snail flesh was greater than that in the shell. The amount of 60Co in individual compartment in the system was changed with time. The highest specific activity of 60Co in the bean of the terrestrial system remained in the root nodule.
文摘目的分析穿桌侧位片(CL)与骨盆正位片(AP)测量髋臼假体前倾角的一致性及可靠性差异。方法回顾性分析2014年5月至2017年7月期间于中山大学孙逸仙纪念医院接受单侧初次全髋关节置换术并于术后第1天进行了CL及AP拍摄的患者,排除有脊柱或骨盆相关疾病或手术史及一期行双侧髋关节置换术的患者,共纳入100例,其中男46例,女54例,平均年龄(54±13)岁。3名独立的对患者资料不知情的测量者分别在CL及AP上进行髋臼杯前倾角测量,使用组内相关系数(ICC)和95%置信区间(CI)评估AP和CL测量值的可靠性,均值、标准差和95%置信区间(CI)用于对两组测量值进行统计描述。结果CL与AP均具有较高的组内和组间ICC,但CL相对更高。CL平均髋臼假体前倾为(17.5±5.3)°,AP为(15.9±9.7)°;CL与AP均值的ICC=0.723[95%CI(0.588,0.813)],差值几乎均在95%一致性界限内(-15.9~12.7),平均差值为-1.6。差值较大的26例中有17例术后30 d AP上闭孔高度及髋臼前倾角较术后1 d及术前发生较大变化。另外发现一例AP显示倾斜方向不明,而CL显示倾斜方向与CT一致。结论CL与AP测量髋臼杯前倾角具有良好的一致性,CL在测量可靠性、臼杯倾斜方向判定上更具有优势。两种方法测量时均需考虑到骨盆前倾角的影响。
