Aim: To study the changes in rheological properties, namely the parameters of the hysteresis loops and yield stress versus time for human semen after ejaculation. Methods: Ejaculates were obtained from volunteers and ...Aim: To study the changes in rheological properties, namely the parameters of the hysteresis loops and yield stress versus time for human semen after ejaculation. Methods: Ejaculates were obtained from volunteers and immediately put into the test cup of a Brookfield Programmable DV-11 Rheometer, by which the hysteresis loops and yield stress were determined. Results: (1) Yield stress values dropped down from more than 3000 mPa to 60 mPa in about 5 minutes after ejaculation; (2) The shape of the hysteresis loops of shear stress versus shear rate was changed from the counter-clockwise direction, that enclosed a large area, into the clockwise direction, that enclosed a very small area. Conclusion: Human ejaculate originally possesses semi-solid or visco-elastic body behavior and in 5 minutes after liquefaction, it becomes a thixotropic fluid or shearing thinning fluid with very low viscosity.展开更多
SF_1是正常人精浆经Sephadex G 100分离后得到的第一组分。将正常人血清和杂种小鼠混合血清作为补体来源,每份血清均以SF_1处理为实验组,并设不加SF_1的自身对照组,从下列实验中分别观察SF_1对补体系统的影响:1.CH_(50)试验证明,SF_1能...SF_1是正常人精浆经Sephadex G 100分离后得到的第一组分。将正常人血清和杂种小鼠混合血清作为补体来源,每份血清均以SF_1处理为实验组,并设不加SF_1的自身对照组,从下列实验中分别观察SF_1对补体系统的影响:1.CH_(50)试验证明,SF_1能抑制人血清中总补体活性(P<0.01);2.SF_1能抑制人血清中补体的溶血作用,并随血清中加入SF_1剂量的增加而抑制作用增强;3.利用YC 花环试验证实SF_1可抑制补体替代途径的激活;4.SF_1不影响用单向琼脂扩散试验测定中C_3、C_4的量,证明SF_1没有影响C_3、C_4的抗原性。上述实验结果提示:SF_1在体外实验中能抑制补体的活性,表现于对补体经典途径和替代途径激活的抑制。展开更多
文摘Aim: To study the changes in rheological properties, namely the parameters of the hysteresis loops and yield stress versus time for human semen after ejaculation. Methods: Ejaculates were obtained from volunteers and immediately put into the test cup of a Brookfield Programmable DV-11 Rheometer, by which the hysteresis loops and yield stress were determined. Results: (1) Yield stress values dropped down from more than 3000 mPa to 60 mPa in about 5 minutes after ejaculation; (2) The shape of the hysteresis loops of shear stress versus shear rate was changed from the counter-clockwise direction, that enclosed a large area, into the clockwise direction, that enclosed a very small area. Conclusion: Human ejaculate originally possesses semi-solid or visco-elastic body behavior and in 5 minutes after liquefaction, it becomes a thixotropic fluid or shearing thinning fluid with very low viscosity.
文摘SF_1是正常人精浆经Sephadex G 100分离后得到的第一组分。将正常人血清和杂种小鼠混合血清作为补体来源,每份血清均以SF_1处理为实验组,并设不加SF_1的自身对照组,从下列实验中分别观察SF_1对补体系统的影响:1.CH_(50)试验证明,SF_1能抑制人血清中总补体活性(P<0.01);2.SF_1能抑制人血清中补体的溶血作用,并随血清中加入SF_1剂量的增加而抑制作用增强;3.利用YC 花环试验证实SF_1可抑制补体替代途径的激活;4.SF_1不影响用单向琼脂扩散试验测定中C_3、C_4的量,证明SF_1没有影响C_3、C_4的抗原性。上述实验结果提示:SF_1在体外实验中能抑制补体的活性,表现于对补体经典途径和替代途径激活的抑制。