Results 21 to 30 of about 552,185 (343)

Step by step optimization of a sperm cryopreservation protocol for spotted wolffish (Anarhichas minor Olafsen, 1772) [PDF]

, 2020
Spotted wolffish Anarhichas minor reproduction in captivity is dependent on in vitro fertilization. However, low sperm volume with relatively low cell concentration and the lack of gametes synchronization (simultaneous availability of mature eggs and ...
Beirão, J., Cabrita, Elsa, Eggen, B., Santana, J.   +3 more
core   +2 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

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

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, A Civetta, A Cordoba-Aguilar, AG Clark, AS Gilchrist, AS Gilchrist, B Jenzer, BI Arthur, CSP Price, D Scott, FM Hunter, GA Parker, GJ Lefevre, GT Miller, H Alonzo-Pimentel, HDM Moore, JK DeVries, L Xue, LG Harshman, LW Simmons, LW Simmons, M Otronen, MH Gromko, MH Gromko, MR Wheeler, S Pitnick, T Pizzari, TR Birkhead, WB Heed, WG Eberhard   +29 more
core   +1 more source

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

The sperm’s tale [PDF]

Investigative Genetics, 2014
Copenhagen is as flat as the proverbial pan-cake. A good way to appreciate this is to visit the Rundetaarn, a 35 m tower whose summit is reached by a spiral ramp designed in the 17th century to accommodate a horse and cart carrying books to its elevated library, and in more recent times inviting the competitive attention of puffing middle-aged blokes ...
openaire   +4 more sources

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
Craig W. LaMunyon, Samuel Ward
openaire   +3 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

Human sperm RNA code senses dietary sugar. [PDF]

, 2020
A new study reveals that a high-sugar diet acutely alters human sperm small RNA profiles after 1 week and that these changes are associated with changes in sperm motility.
Chen, Qi, Zhang, Ying
core   +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