Abstract
SHS investigation development is considered from the geographical and historical viewpoint. 3 stages are described. Within Stage 1 the work was carried out in the Department of the Institute of Chemical Physics in Chernogolovka where the scientific discovery had been made. At Stage 2 the interest to SHS arose in different cities and towns of the former USSR. Within Stage 3 SHS entered the international scene. Now SHS processes and products are being studied in more than 50 countries.
Abstract
Sperm cells evolved to acquire a sophisticated motility structure called a flagellum which gives spermatozoa a self-propelling force. Nonetheless, in internal fertilizing species such as mammals, the length and complexity of the female genital tract mean that sperm motility is insufficient to accomplish the sperm’s mission of transferring genetic material to the oocyte. Thus, a long-standing question in the reproductive biology field has been how spermatozoa are delivered to the oocyte surface. Several mechanisms have been proposed to help sperm transport, such as oviduct peristalsis, chemotaxis, thermotaxis and rheotaxis. In this chapter we will discuss the state of the art of sperm chemotaxis.
Keywords:
Chemoattractants, Chemoattractant sources, Methods for chemotaxis evaluation, Sperm chemotaxis.
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Authors:Bentham Science Books