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Characterization of boar sperm plasma membranes by two-dimensional PAGE and isolation of specific groups of polypeptides by anion exchange chromatography and lectin affinity chromatography
plasma membranes spermatozoa twodimensional
2009/2/19
High resolution, two-dimensional PAGE was used to characterize purified plasma membranes (PM) from boar spermatozoa. In addition to the abundance of polypeptides resolved, unusual features of PM dis...
性交换(sexual exchange between partners)
性交换
2008/4/16
性交换,或称性方面的人际交换,是指在某种性活动或者性关系当中,双方或者多方在性方面自愿地互相付出和获得回的过程。
性交换的概念来源于性的人际互动理论,指的是各种各样的互动当中,表现为
互相付出和获得回报的那种互动过程和互动方式。性交换的概念认为,不管当事人
能否清醒地意识到,每个人在性活动中都存在着客观上的功利目的。为了实现自己
的目的,人们只有3种办法:第一,强迫对方服从于和服务于自...