منابع مشابه
Sperm design and sperm function.
Spermatozoa vary enormously in their form and dimensions, both between and within species, yet how this variation translates into fertilizing efficiency is not known. Sperm swimming velocity is a key determinant of male fertilization success, but previous efforts to identity which sperm phenotypic traits are associated with swimming velocity have been unsuccessful. Here, we examine the relation...
متن کاملAssessing sperm function.
This article reviews basic semen tests and new fertility tests that are providing great insights to the rapidly developing understanding of male infertility. Finally, promising new tests under development are mentioned with their potential clinical applications.
متن کاملDefending Sperm Function
ß-defensins are a large family of cationic peptides with antimicrobial activities in vitro against Gram-positive and Gramnegative bacteria, fungi, and enveloped viruses [1]. As such, they are thought to be an important component of the innate immune system and are expressed by cells such as phagocytes and epithelia that are involved in host defence against microbial infections. The defensins fo...
متن کاملAssessment of sperm function and clinical aspects of impaired sperm function.
Fertility is dependent on a complex set of events, involving both male and female components. Normal sperm function involves many steps, including motility, capacitation, acrosome reactivity and, ultimately, fertilization of the oocyte. While male fertility is most often assessed by means of gross semen parameters, infertility may also be caused by abnormal sperm function, and only by performin...
متن کاملGamete evolution and sperm numbers: sperm competition versus sperm limitation.
Both gamete competition and gamete limitation can generate anisogamy from ancestral isogamy, and both sperm competition (SC) and sperm limitation (SL) can increase sperm numbers. Here, we compare the marginal benefits due to these two components at any given population level of sperm production using the risk and intensity models in sperm economics. We show quite generally for the intensity mod...
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ژورنال
عنوان ژورنال: Biology Letters
سال: 2006
ISSN: 1744-9561,1744-957X
DOI: 10.1098/rsbl.2006.0449