Results 11 to 20 of about 192,203 (268)
Sperm design and sperm function [PDF]
Biology Letters, 2006 Abstract Spermatozoa vary enormously in their form and dimensions, both between and within species, yet how this variation translates into fertilizing efficiency is not known. Sperm swimming velocity is a key determinant of male fertilization success, but previous efforts to identity which sperm phenotypic traits are associated with ...
Malo Valenzuela, Aurelio F. +5 more
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Sperm Viability and Sperm Competition in Insects [PDF]
Current Biology, 2002 Uploaded by Plazi for TaxoDros. We do not have abstracts.
Hunter, F.M, Birkhead, T.R
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Automated Sperm Immobilization for Intracytoplasmic Sperm Injection [PDF]
IEEE Transactions on Biomedical Engineering, 2011 Sperm immobilization is a requisite step in intracytoplasmic sperm injection (ICSI). Conventionally, sperm immobilization is performed manually, which entails long training hours and stringent skills. Manual sperm immobilization also has the limitation of low success rates and poor reproducibility due to human fatigue and skill variations across ...
Clement Leung +4 more
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Evolution of sperm size in nematodes: sperm competition favours larger sperm [PDF]
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1999 In the free-living rhabditid nematode Caenorhabditis elegans, sperm size is a determinant of sperm competitiveness. Larger sperm crawl faster and physically displace smaller sperm to take fertilization priority, but not without a cost: larger sperm are produced at a slower rate. Here, we investigate the evolution of sperm size in the family Rhabditidae
C W, LaMunyon, S, Ward
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Sperm Competition, Sperm Numbers and Sperm Quality in Muroid Rodents
PLoS ONE, 2011 Sperm competition favors increases in relative testes mass and production efficiency, and changes in sperm phenotype that result in faster swimming speeds. However, little is known about its effects on traits that contribute to determine the quality of a whole ejaculate (i.e., proportion of motile, viable, morphologically normal and acrosome intact ...
Laura Gómez Montoto +7 more
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Molecular Analysis of DPY19L2, PICK1 and SPATA16 in Italian Unrelated Globozoospermic Men
Life, 2021 This study aims to evaluate genetic contribution and sperm DNA fragmentation (SDF) in a cohort of 18 unrelated globozoospermic Italian men (Group G). Semen samples were assessed according to the WHO 2010 Laboratory Manual and compared with 31 fertile ...
Fabiana Faja +7 more
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Reproductive Biology and Endocrinology, 2022 Background Previous research has shown that the type and duration of erotic material that men have access to during masturbation can influence semen parameters.
Daniel Rosenkjær +3 more
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Biomedicines, 2022 Virilization of gender-incongruent subjects to whom were assigned the female gender at birth (AFAB) is achieved through testosterone administration. Inter-individual differences in the timing and acquisition of phenotypic characteristics, even if the ...
Francesco Pallotti +12 more
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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
Parker GA, Lehtonen J
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Sperm Cholesterol Content Modifies Sperm Function and TRPV1-Mediated Sperm Migration [PDF]
International Journal of Molecular Sciences, 2021 Transient receptor potential channels-vanilloid receptor 1 (TRPV1) regulates thermotaxis in sperm-oriented motility. We investigated the role of membrane cholesterol (Chol) on TRPV1-mediated human sperm migration. Semen samples were obtained from five normozoospemic healthy volunteers.
De Toni L. +9 more
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