Results 11 to 20 of about 141,242 (314)

Hydrodynamic propulsion of human sperm [PDF]

, 2009
The detailed fluid mechanics of sperm propulsion are fundamental to our understanding of reproduction. In this paper, we aim to model a human sperm swimming in a microscope slide chamber.
Green, Richard B., Cannon, R.M., Pacey, A.A., Gillies, E.A., Gillies, Eric A., Green, R.B., Pacey, Allan A.; id_orcid, Cannon, Richard M.   +7 more
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Does air pollution exposure affect semen quality? Evidence from a systematic review and meta-analysis of 93,996 Chinese men

Frontiers in Public Health, 2023
BackgroundAir pollution may impair male fertility, but it remains controversial whether air pollution affects semen quality until now.ObjectivesWe undertake a meta-analysis to explore potential impacts of six pollutants exposure during the entire window (
Junjie Liu, Yanpeng Dai, Runqing Li, Jiayi Yuan, Quanxian Wang, Linkai Wang   +5 more
doaj   +1 more source

RNA in human sperm

Asian Journal of Andrology, 2005
We have yet to develop a fundamental understanding of the molecular complexities of human spermatozoa. This encompasses the unique packaging and structure of the sperm genome along with their paternally derived RNAs in preparation for their delivery to the egg.
Rui Pires, Martins, Stephen A, Krawetz
openaire   +2 more sources

Semen parameters are seriously affected in acephalic spermatozoa syndrome

Basic and Clinical Andrology, 2022
Résumé Contexte Des études antérieures ont rapporté que certains patients qui avaient des spermatozoïdes sans tête présentaient une mauvaise qualité du sperme, mais il n’y a eu aucune analyse systématique publiée sur la qualité du sperme chez les ...
Li-juan Ying, Lin Yu, Tingting Yang, Ying-bi Wu, Jin-yan Xu, Ye-lin Jia, Yan Zheng, Fuping Li   +7 more
doaj   +1 more source

Rheotaxis facilitates upstream navigation of mammalian sperm cells [PDF]

, 2014
A major puzzle in biology is how mammalian sperm maintain the correct swimming direction during various phases of the sexual reproduction process. Whilst chemotaxis may dominate near the ovum, it is unclear which cues guide spermatozoa on their long ...
Dunkel, Jörn, Raymond E Goldstein, Jörn Dunkel, Goldstein, Raymond E., Martyn Blayney, Kantsler, Vasily, Dunkel, Joern, Blayney, Martyn, Vasily Kantsler   +8 more
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Genetics of Human Sperm [PDF]

Journal of Assisted Reproduction and Genetics, 1998
Chromosome abnormalities in sperm were studied by fluorescence in situ hybridization to determine the frequency and distribution of abnormalities in normal men and the effect of donor age on the frequency of abnormalities. Studies of chemotherapy and infertility patients assessed any increased risk in these populations.Multicolor fluorescence in situ ...
openaire   +2 more sources

Patch clamp studies of human sperm under physiological ionic conditions reveal three functionally and pharmacologically distinct cation channels [PDF]

, 2014
Whilst fertilizing capacity depends upon a K+ conductance G? that allows the spermatozoon membrane potential Vm to be held at a negative value, the characteristics of this conductance in human sperm are virtually unknown.
Barratt, C.L.R.; id_orcid, Mansell, S.A., Publicover, S J, Mansell, S A, Wilson, S M, Publicover, S.J., Barratt, C.L.R, Barratt, C L R, Wilson, S.M.   +8 more
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Leydig cell metabolic disorder act as a new mechanism affecting for focal spermatogenesis in Klinefelter syndrome patients: a real world cross-sectional study base on the age

Frontiers in Endocrinology, 2023
BackgroundKlinefelter’s syndrome (KS) was once considered infertile due to congenital chromosomal abnormalities, but the presence of focal spermatozoa changed this.
Huang Liu, Zhenhui Zhang, Yong Gao, Hai Lin, Zhiyong Zhu, Houbin Zheng, Wenjing Ye, Zefang Luo, Zhaohui Qing, Xiaolan Xiao, Lei Hu, Yu Zhou, Xinzong Zhang   +12 more
doaj   +1 more source

Cryobanking of human sperm [PDF]

Journal of Medical Ethics, 1975
This brief essay discusses some of the medical and social uses of banking human semen as well as many of the ethical issues which emerge from the application of this technology.
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Re-sperm collection with a short abstinence time: a strategy for successful cryopreservation in cryptozoospermia [PDF]

Journal of Men's Health
Background: Recent studies suggest that short-term abstinence may improve semen parameters; however, its impact on cryptozoospermia remains underexplored.
Wen-Rui Zhao, Bo Liu, Xue-Feng Luo, Jin-Yan Xu, Chen Luo, Yuan Liu, Yang Xian, Fu-Ping Li   +7 more
doaj   +1 more source