Results 41 to 50 of about 740,952 (392)
Molecular and Cellular Endocrinology, 2006 Thermotaxis--movement directed by a temperature gradient--is a prevalent process, found from bacteria to human cells. In the case of mammalian sperm, thermotaxis appears to be an essential mechanism guiding spermatozoa, released from the cooler reservoir site, towards the warmer fertilization site.
Bahat, Anat, Eisenbach, Michael
openaire +2 more sources
Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions [PDF]
, 2008 Sperm swimming at low Reynolds number have strong hydrodynamic interactions when their concentration is high in vivo or near substrates in vitro. The beating tails not only propel the sperm through a fluid, but also create flow fields through which sperm
D. M. Woolley +5 more
core +2 more sources
Gamete evolution and sperm numbers: sperm competition versus sperm limitation [PDF]
Proceedings of the Royal Society B: Biological Sciences, 2014 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
Jussi Lehtonen, Geoff A. Parker
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Psychological and physiological adaptations to sperm competition in humans [PDF]
, 2005 Postcopulatory competition between males, in the form of sperm competition, is a widespread phenomenon in many animal species. The extent to which sperm competition has been an important selective pressure during human evolution remains controversial ...
Goetz, AT, Pound, N, Shackelford, TK
core +2 more sources
Sperm Viability Matters in Insect Sperm Competition [PDF]
Current Biology, 2005 Experimental studies in insects have shown how sperm competition can be a potent selective force acting on an array of male reproductive traits . However, the role of sperm quality in determining paternity in insects has been neglected, despite the fact that sperm quality has been shown to influence the outcome of sperm competition in vertebrates .
Francisco Garcia-Gonzalez +1 more
openaire +3 more sources
Scientific Reports, 2023 Because the total gene copy number remains constant and all genes are normally expressed, carriers of balanced chromosomal translocations usually have a normal phenotype but are able to produce many different types of gametes during meiosis, and ...
Xiaoqi Zeng +6 more
doaj +1 more source
Advances in Cryopreservation of Bull Sperm
Frontiers in Veterinary Science, 2019 Cryopreservation of semen and artificial insemination have an important, positive impact on cattle production, and product quality. Through the use of cryopreserved semen and artificial insemination, sperm from the best breeding bulls can be used to ...
M. R. Ugur +8 more
semanticscholar +1 more source
Frontiers in Public Health, 2023 BackgroundAir pollution may impair male fertility, but it remains controversial whether air pollution affects semen quality until now.ObjectivesWe undertake a meta-analysis to explore potential impacts of six pollutants exposure during the entire window (
Junjie Liu +5 more
doaj +1 more source
Sperm defects in primary ciliary dyskinesia and related causes of male infertility
Cellular and Molecular Life Sciences, 2019 The core axoneme structure of both the motile cilium and sperm tail has the same ultrastructural 9 + 2 microtubular arrangement. Thus, it can be expected that genetic defects in motile cilia also have an effect on sperm tail formation.
A. Sironen +4 more
semanticscholar +1 more source
Male sperm whale acoustic behavior observed from multipaths at a single hydrophone [PDF]
, 2005 Sperm whales generate transient sounds (clicks) when foraging. These clicks have been described as echolocation sounds, a result of having measured the source level and the directionality of these signals and having extrapolated results from biosonar ...
Adam, Olivier +3 more
core +4 more sources