Results 61 to 70 of about 158,096 (183)
BMC Veterinary Research, 2017 Background Sperm selection methods such as Single Layer Centrifugation (SLC) have been demonstrated to be a useful tool to improve the quality of sperm samples and therefore to increase the efficiency of other artificial reproductive techniques in ...
L. Anel-Lopez +8 more
doaj +1 more source
Cells, 2022 We present a multidisciplinary approach for predicting how sperm cells with various morphologies swim in three-dimensions (3D), from milliseconds to much longer time scales at spatial resolutions of less than half a micron.
Mayssam Nassir +4 more
doaj +1 more source
Paternity in mallards: effects of sperm quality and female sperm selection for inbreeding avoidance [PDF]
, 2017 Postcopulatory processes might play an important role in sexual selection. In theory, fertilization success could be controlled by females via selection of particular sperm within their reproductive tract, or it could be determined by sperm competition ...
Denk, Angelika G. +4 more
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Evidence of the presence of calcium/calmodulin-dependent protein kinase IV in human sperm and its involvement in motility regulation [PDF]
, 2005 The mechanisms involved in the regulation of mammalian sperm motility are not well understood. Calcium ions (Ca(2+)) have been suggested to play a key role in the maintenance of motility; nevertheless, how Ca(2+) modulates this process has not yet been ...
Buffone, Mariano Gabriel +6 more
core +1 more source
Fertilization competence and sperm size variation in sperm-heteromorphic insects [PDF]
, 2018 Between species, variation in sperm size has been related to male-female coevolution and male-male competition. In contrast, variation within species is poorly understood.
Bernasconi, G., Hellriegel, B.
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Reproductive Traits: Evidence for Sexually Selected Sperm [PDF]
Current Biology, 2008 Sperm exhibit extraordinary morphological divergence yet precise evolutionary causes often remain elusive. A quantitative genetic study sheds light on the major role postcopulatory sexual selection could play in determining sperm size.
Martin, O Y, Demont, M
openaire +3 more sources
The Animal Sexes as Historical Explanatory Kinds [PDF]
, 2020 Though biologists identify individuals as ‘male’ or ‘female’ across a broad range of animal species, the particular traits exhibited by males and females can vary tremendously.
Franklin-Hall, Laura
core +1 more source
Negative phenotypic and genetic associations between copulation duration and longevity in male seed beetles [PDF]
, 2009 Reproduction can be costly and is predicted to trade-off against other characters. However, while these trade-offs are well documented for females, there has been less focus on aspects of male reproduction.
AA Hoffmann +69 more
core +1 more source
Sperm death and dumping in Drosophila [PDF]
, 2004 Mating with more than one male is the norm for females of many species. In addition to generating competition between the ejaculates of different males, multiple mating may allow females to bias sperm use.
A Civetta +29 more
core +1 more source
Effect of competitive cues on reproductive morphology and behavioral plasticity in male fruitflies [PDF]
, 2015 Phenotypic plasticity will be favored whenever there are significant fitness benefits of responding to environmental variation. The extent and nature of the plasticity that evolves depends on the rate of environmental fluctuations and the capacity to ...
Bretman, Amanda +3 more
core +1 more source