Results 31 to 40 of about 740,952 (392)

Sperm competition and the evolution of sperm design in mammals [PDF]

BMC Evolutionary Biology, 2011
AbstractBackgroundThe influence of sperm competition upon sperm size has been a controversial issue during the last 20 years which remains unresolved for mammals. The hypothesis that, when ejaculates compete with rival males, an increase in sperm size would make sperm more competitive because it would increase sperm swimming speed, has generated ...
Maximiliano Tourmente, Maximiliano Tourmente, Eduardo R. S. Roldan, Montserrat Gomendio   +3 more
openaire   +5 more sources

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

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

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

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

Dnmt2 mediates intergenerational transmission of paternally acquired metabolic disorders through sperm small non-coding RNAs

Nature Cell Biology, 2018
The discovery of RNAs (for example, messenger RNAs, non-coding RNAs) in sperm has opened the possibility that sperm may function by delivering additional paternal information aside from solely providing the DNA1.
Yunfang Zhang, Xudong Zhang, Junchao Shi, F. Tuorto, Xin Li, Yusheng Liu, Reinhard Liebers, Liwen Zhang, Yongcun Qu, Jingjing Qian, Maya Pahima, Y. Liu, Menghong Yan, Zhonghong Cao, Xiaohua Lei, Yu-jing Cao, Hongying Peng, Shichao Liu, Yue Wang, Huili Zheng, Rebekah J. Woolsey, D. Quilici, Q. Zhai, Lei Li, T. Zhou, Wei Yan, F. Lyko, Ying Zhang, Qi Zhou, E. Duan, Qi Chen   +30 more
semanticscholar   +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

lambda nordica, 2020
See full-text ...
openaire   +3 more sources

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 ...
Maximiliano Tourmente, Juan Martín-Coello, Concepción Magaña, Laura Gómez Montoto, Montserrat Gomendio, Juan José Luque-Larena, Eduardo R. S. Roldan, C. Crespo   +7 more
openaire   +4 more sources