Results 21 to 30 of about 566,665 (344)

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
openaire   +2 more sources

Effects of virtual reality erotica on ejaculate quality of sperm donors: a balanced and randomized controlled cross-over within-subjects trial

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, Allan Pacey, Robert Montgomerie, Anne-Bine Skytte   +3 more
doaj   +1 more source

Epigenetic Effects of Gender-Affirming Hormone Treatment: A Pilot Study of the ESR2 Promoter’s Methylation in AFAB People

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, Giulia Senofonte, Fani Konstantinidou, Silvia Di Chiano, Fabiana Faja, Flavio Rizzo, Francesco Cargnelutti, Csilla Krausz, Donatella Paoli, Andrea Lenzi, Liborio Stuppia, Valentina Gatta, Francesco Lombardo   +12 more
doaj   +1 more source

Sperm design and variation in the New World blackbirds (Icteridae) [PDF]

, 2009
Post-copulatory sexual selection (PCSS) is thought to be one of the evolutionary forces responsible for the rapid and divergent evolution of sperm design. However, whereas in some taxa particular sperm traits are positively associated with PCSS, in other
AF Malo, AF Malo, AF Malo, BGM Jamieson, CK Cornwallis, CW LaMunyon, CW LaMunyon, D Urbach, DF Katz, DP Froman, DR Levitan, E García-Berthou, EH Morrow, EH Morrow, EJ Pellatt, EP Martins, G Arnqvist, G Burness, GA Parker, GA Parker, GA Parker, GA Parker, George M. Linz, GT Miller, HDM Moore, J Cohen, J Felsenstein, J Sivinski, JA Stoltz, JH Samour, JJL Higdon, JL Fitzpatrick, JL Fitzpatrick, JV Briskie, JV Briskie, L Locatello, LK Dybas, LZ Garamszegi, M Gomendio, M Pagel, MD Pagel, MJ Anderson, MJG Gage, MJG Gage, MJG Gage, MJG Gage, N Minoretti, O Kleven, PG Byrne, PH Harvey, PH Harvey, PI Ward, R Thornhill, RA Beatty, RA Beatty, RA Cardullo, RP Freckleton, RR Snook, S Balshine, S Calhim, S Calhim, S Humphries, S Immler, S Immler, S Immler, S Immler, S Lüpold, S Lüpold, S Pitnick, Stefan Lüpold, T Garland, T Pizzari, TE Pitcher, Tim R. Birkhead, TR Birkhead, TR Birkhead, WE Harris, WG Eberhard, WG Eberhard, WH Burrows, WV Holt, Å Franzén   +81 more
core   +2 more sources

Sperm storage by males causes changes in sperm phenotype and influences the reproductive fitness of males and their sons [PDF]

, 2017
Recent studies suggest that environmentally induced effects on sperm phenotype can influence offspring phenotype beyond the classic Mendelian inheritance mechanism.
Adriaenssens, Aitken, Almbro, Bonduriansky, Bonduriansky, Boschetto, Crean, Crean, Crean, Curley, El Jack, Evans, Evans, Evans, Evans, Falconer, Firman, Franco, Froman, Gasparini, Gasparini, Gasparini, Gasparini, Head, Holt, Houde, Immler, Immler, Jensen, Jones, Kilgallon, Lynch, Marshall, Orr, Parker, Perry, Pilastro, Pilastro, Pilastro, Pizzari, Poiani, R Development Core Team, Rahman, Rahman, Reinhardt, Reinhardt, Sheldon, Simmons, Simmons, Siva-Jothy, Tan, Tarin, Vasudeva, White, Zajitschek   +54 more
core   +1 more source

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, Gerhard Gompper, J. Gray, Jens Elgeti, L. J. Fauci, Yingzi Yang   +5 more
core   +2 more sources

Sophisticated sperm allocation in male fowl [PDF]

, 2003
When a female is sexually promiscuous, the ejaculates of different males compete for the fertilization of her eggs; the more sperm a male inseminates into a female, the more likely he is to fertilize her eggs.
Pizzari, T., Cornwallis, C.K., Lovlie, H., Jakobssen, S., Birkhead, T.R.   +4 more
core   +1 more source

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., Sabovic I., De Filippis V., Acquasaliente L., Peterle D., Guidolin D., Sut S., Di Nisio A., Foresta C., Garolla A.   +9 more
openaire   +2 more sources

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

Gene sequencing and result analysis of balanced translocation carriers by third-generation gene sequencing technology

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, Dandan Lin, Danhong Liang, Jingwen Huang, Jinsong Yi, Dianliang Lin, Zhengmian Zhang   +6 more
doaj   +1 more source