Results 171 to 180 of about 492,766 (213)
Some of the next articles are maybe not open access.
Early sperm-egg interaction after sperm microinjection
Reproduction, Fertility and Development, 1994The early events of sperm-egg interaction occurring 1-3 h after multiple sperm injection into the perivitelline space (PVS) and after direct injection into the ooplasm of human oocytes are reported. The sperm acrosome reaction occurred in the PVS but was not detected within the ooplasm.
A H, Sathananthan +5 more
openaire +2 more sources
Sperm centriole disfunction and sperm immotility
Molecular and Cellular Endocrinology, 2000The two main causes of complete or nearly complete asthenozoospermia are necrozoospermia (presence of only non-viable spermatozoa) and the different ultrastructural abnormalities of spermatozoa. Ultrastructural alterations may affect also the function of the sperm centrosome, which can result in impaired motility.
openaire +2 more sources
Sperm size and sperm competition in birds
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1992In a sample of 20 species of North American passerine birds we found no relation between sperm size and mating system like that previously reported in mammals (Gomendio & Roldan (Proc. R. Soc. Lond. B 243, 181 (1991)). Instead, we found a positive correlation between sperm length and the length of female sperm storage tubules (SSTS) and a negative ...
J V, Briskie, R, Montgomerie
openaire +2 more sources
Sperm‐sperm associations in the loris epididymis
Gamete Research, 1987AbstractIn a few mammals, the passage of maturing spermatozoa through the epididymis is characterized by development of persistent associations between one or more neighboring cells over the acrosomal region. The converse situation is described here in the loris, Nycticebus coucang, a prosimian primate.
D M, Phillips, J M, Bedford
openaire +2 more sources
Sperm competition games: sperm size and sperm number under adult control
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1993Evolutionary games of sperm competition in which two males mate with the same female have previously considered sperm size to be fixed at some (small) constant level. Although male gametes in multicellular organisms are typically small compared with ova, they vary greatly both between and within groups, and sperm size sometimes correlates with the ...
openaire +2 more sources
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
openaire +2 more sources
Journal of Clinical Ultrasound, 1986
K, Ramanathan, J, Yaghoobian, R L, Pinck
openaire +2 more sources
K, Ramanathan, J, Yaghoobian, R L, Pinck
openaire +2 more sources