Results 321 to 330 of about 566,665 (344)
Some of the next articles are maybe not open access.
Reviews of Reproduction, 1999
Communication between spermatozoa and egg before contact by chemotaxis appears to be prevalent throughout the animal kingdom. In non-mammalian species, sperm chemotaxis to factors secreted from the egg is well documented. In mammals, sperm chemotaxis to follicular factors in vitro has been established in humans and mice.
openaire +2 more sources
Communication between spermatozoa and egg before contact by chemotaxis appears to be prevalent throughout the animal kingdom. In non-mammalian species, sperm chemotaxis to factors secreted from the egg is well documented. In mammals, sperm chemotaxis to follicular factors in vitro has been established in humans and mice.
openaire +2 more sources
Archives of Andrology, 2000
Available data on dry and hydrated nuclear volume of mammalian spermatozoa indicate that available volume is clearly insufficient to contain sperm chromatin packed in nucleosome-like structures. Therefore, sperm DNA-protein complexes must be packed differently than somatic DNA-protein complexes.
G, Fuentes-Mascorro +2 more
openaire +2 more sources
Available data on dry and hydrated nuclear volume of mammalian spermatozoa indicate that available volume is clearly insufficient to contain sperm chromatin packed in nucleosome-like structures. Therefore, sperm DNA-protein complexes must be packed differently than somatic DNA-protein complexes.
G, Fuentes-Mascorro +2 more
openaire +2 more sources
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
openaire +2 more sources
SPERM ACROSOME STATUS AND SPERM ANTIBODIES IN INFERTILITY
Journal of Urology, 1998We studied whether the spermatozoa from sperm autoimmune infertile men undergo premature acrosomal loss and whether this relates to the presence of sperm antibodies in wives.We evaluated acrosome status of live washed native and overnight capacitated spermatozoa from 17 sperm nonautoimmune fertile and 23 sperm autoimmune infertile men using an ...
S, Harrison, G, Hull, S, Pillai
openaire +2 more sources
Sperm competition influences sperm size in mammals
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1991Among mammals sperm competition leads to selection for increased sperm numbers but it is not known whether it also leads to changes in sperm size. Two contrasting theoretical predictions have been made. The first hypothesis relies on the assumption that there is a trade-off between sperm numbers and sperm size and predicts that, in species confronting ...
M, Gomendio, E R, Roldan
openaire +2 more sources
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 ...
openaire +2 more sources
Sperm or No Sperm, that is the question. Or is it?
2023Comte, Jennifer +7 more
openaire +1 more source
Donor sperm for intracytoplasmic sperm injection
The Lancet, 2001G, Tews, C, Yaman, T, Ebner, M, Moser
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
[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.
openaire +1 more source