Results 311 to 320 of about 489,854 (362)
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Trends in Cognitive Sciences, 2002
Evidence is accumulating that in many species, males deliver more sperm to some females and fewer to others depending on how valuable they perceive the copulation. Do humans have any control over the number of sperm they ejaculate?
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Evidence is accumulating that in many species, males deliver more sperm to some females and fewer to others depending on how valuable they perceive the copulation. Do humans have any control over the number of sperm they ejaculate?
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SPERM COMPETITION AND THE EVOLUTION OF NONFERTILIZING SPERM IN MAMMALS
Evolution, 1991Nonfertilizing sperm with special morphologies have long been known to exist in invertebrates. Until recently, abnormal sperm in mammals were considered errors in production. Now, however, Baker and Bellis (1988, 1989) have proposed that mammalian sperm, like some invertebrate sperm, are polymorphic and adapted to a variety of nonfertilizing roles in ...
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Sperm competition games: sperm selection by females
Journal of Theoretical Biology, 2003We analyse a co-evolutionary sexual conflict game, in which males compete for fertilizations (sperm competition) and females operate sperm selection against unfavourable ejaculates (cryptic female choice). For simplicity, each female mates with two males per reproductive event, and the competing ejaculates are of two types, favourable (having high ...
M A, Ball, G A, Parker
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Sperm or No Sperm, that is the question. Or is it?
2023Comte, Jennifer +7 more
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[Sperm antigens and sperm antibodies].
Zentralblatt fur Gynakologie, 1986A review is given about the actual knowledge of sperm antigens and antibodies. For the detection of sperm antibodies a great number of tests exists with different value for the clinical work. The penetration tests are suitable for screening investigations.
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Sperm Selection: Effect on Sperm DNA Quality
2013The selection of spermatozoa without DNA fragmentation and chromosomal diseases prior to assisted reproductive techniques helps to optimize the outcome of the treatment; in particular, sperm selection prior to in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) is crucial.
Lodovico, Parmegiani +2 more
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SPERM COMPETITION AND ITS EVOLUTIONARY CONSEQUENCES IN THE INSECTS
, 1970Geoff A. Parker
semanticscholar +1 more source
Donor sperm for intracytoplasmic sperm injection
The Lancet, 2001G, Tews, C, Yaman, T, Ebner, M, Moser
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1998
Abstract The new reproductive technologies force us to think about embryos and gametes in ways never before necessary or possible. In particular, cryopreservation enables sperm and fertilized eggs to be maintained for long periods outside the body, giving rise to questions about to whom they belong and what may be done with them.
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Abstract The new reproductive technologies force us to think about embryos and gametes in ways never before necessary or possible. In particular, cryopreservation enables sperm and fertilized eggs to be maintained for long periods outside the body, giving rise to questions about to whom they belong and what may be done with them.
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Structures of sperm flagellar doublet microtubules expand the genetic spectrum of male infertility
Cell, 2023Pengyu Huang, Xin Zhang, Miao Gui
exaly