Results 341 to 350 of about 487,985 (362)

Recent Advances in the Diagnosis and Management of Retrograde Ejaculation: A Narrative Review. [PDF]

Diagnostics (Basel)
Konstantinidis C, Zachariou A, Evgeni E, Çayan S, Boeri L, Agarwal A.   +5 more
europepmc   +1 more source

Storage Conditions of Sperm Samples and Gametic Characterization by Sperm Head Morphometry in Drones (<i>Apis mellifera</i>). [PDF]

Animals (Basel)
Esteso MC, Toledano-Díaz A, Castaño C, Higes M, Martín-Hernández R, López-Goya A, De la Rúa P, Martínez-Madrid B, Santiago-Moreno J.   +8 more
europepmc   +1 more source

The unbearable (financial) burdens of parenting

The British Journal of Sociology, EarlyView.
Alya Guseva
wiley   +1 more source

Circulating extracellular vesicles can transport stress signals to the male germline

Alshanbayeva A, Steg LC, Othman A, Manuella F, Arzate-Mejía RG, Zamboni N, Mansuy IM.   +6 more
europepmc   +1 more source

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Sperm size and sperm competition in birds

Proceedings of the Royal Society of London. Series B: Biological Sciences, 1992
In 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 ...
James V. Briskie, Robert Montgomerie
openaire   +3 more sources

Sperm‐sperm associations in the loris epididymis

Gamete Research, 1987
AbstractIn 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.
J. M. Bedford, David M. Phillips
openaire   +3 more sources

Sperm centriole disfunction and sperm immotility

Molecular and Cellular Endocrinology, 2000
The 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   +3 more sources

Intracytoplasmic sperm injection and pregnancy with decapitated sperm

Fertility and Sterility, 2010
To perform intracytoplasmic sperm injection (ICSI) in couples with primary infertility owing to sperm defects causing total immotility.Case report.Couple Sterility Center, University of Siena.Two infertile couples, the male members of which had "detached tail" genetic sperm defect.Physical and hormonal assays, semen analysis by light and electron ...
Gambera, Laura, Falcone, P., Mencaglia, L., Collodel, Giulia, Serafini, Francesca, DE LEO, Vincenzo, Piomboni, Paola   +6 more
openaire   +4 more sources

Sperm competition games: sperm selection by females

Journal of Theoretical Biology, 2003
We 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 ...
Geoff A. Parker, M.A. Ball
openaire   +3 more sources

The sperm proteasome during sperm capacitation and fertilization

Journal of Reproductive Immunology, 2009
The 26S proteasome is a multi-subunit protease specifically targeting ubiquitinated proteins. A consensus has emerged from studies by multiple laboratories on the role of sperm-borne proteasomes in human, mouse, pig, bovine, ascidian and echinoderm fertilization.
Peter Sutovsky, Shawn Zimmerman
openaire   +3 more sources