Results 31 to 40 of about 754,638 (394)

Human sperm ion channel (dys)function:implications for fertilization [PDF]

, 2019
BACKGROUND: Intensive research on sperm ion channels has identified members of several ion channel families in both mouse and human sperm. Gene knock-out studies have unequivocally demonstrated the importance of the calcium and potassium conductances in ...
Barratt, Christopher L. R., Brown, Sean G., Martins da Silva, Sarah J., Publicover, Stephen J.   +3 more
core   +4 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

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 proteins SOF1, TMEM95, and SPACA6 are required for sperm−oocyte fusion in mice

Proceedings of the National Academy of Sciences of the United States of America, 2020
Significance The sperm−oocyte fusion step is important to transport the male genome into oocytes. So far, IZUMO1 and FIMP have been identified as fusion-related proteins in spermatozoa, but the molecular mechanisms underpinning sperm−oocyte fusion and ...
Taichi Noda, Yonggang Lu, Yoshitaka Fujihara, Seiya Oura, Takayuki Koyano, Sumire V. Kobayashi, M. Matzuk, M. Ikawa   +7 more
semanticscholar   +1 more source

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

How sperm competition shapes the evolution of testes and sperm: a meta-analysis

Philosophical Transactions of the Royal Society of London. Biological Sciences, 2020
Females of many species mate with multiple males, thereby inciting competition among ejaculates from rival males for fertilization. In response to increasing sperm competition, males are predicted to enhance their investment in sperm production.
S. Lüpold, Raïssa A. de Boer, J. Evans, J. L. Tomkins, J. Fitzpatrick   +4 more
semanticscholar   +1 more source

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
Geoff A, Parker, Jussi, Lehtonen
openaire   +2 more sources