皮秒扫描相机在半导体激光管输出特性研究中的应用

本工作用Picotron 200型扫描相机和液态氮冷却的CCD摄相机系统对半导体激光二极管LTO22 MC的输出特性进行了测量,其最短输出脉冲宽度为2.1ps。这种半导体激光二极管的发射波长为780nm,连续工作条件下,其输出功率为3mW到5mW。

Status of vitamin E and reduced glutathione in semen of oligozoospermic and azoospermic patients

Aim:To investigate the status of seminal plasma reduced glutathione(GSH)and vitamin E in three different condi-tions of spermatogenesis:azoospermia,oligozoospermia and nonnospennia.Methods:Reduced glutathione wasmeasured in the seminal plasma by the method of Moron et al(1979),and vitamin E estimation was performed by themethod of Taylor et al(1976).Results:Vitamin E levels in seminal plasma of oligospermic and azoospennic sam-ples were significantly decreased to 65.54%and 66.04%respectively as compared to the normospermic group.Levelsof reduced glutathione were also significantly decreased in oligospermic and azoospennic group,and the reduction inazoospermic group(76.73%)was more pronounced than oligozoospermic group(62.07%).Conclusion.The de-crease in reduced glutathione,an endogenous antioxidant,levels in azoospermic and oligozoospermic conditions maycause dismption in the membrane integrity of spermatozoa as a consequence of increased oxidative stress.

体力活动多与少的健康人群以及早期骨关节炎病人的T1rho、T2值和局灶性膝关节软骨异常——3.0T MRI的研究结果

①评价体力活动多和体力活动少的健康人群以及早期骨关节炎病人的局灶性软骨异常的程度。②确定T2和T1rho的测量对无症状的、体力活动多的人群的局灶性软骨病变的诊断价值。13例无症状、体力活动多的健康人，7例无症状、体力活动少的健康人，17例轻度骨关节炎病人，接受了3．0 T MR膝关节检查。