Results 21 to 30 of about 267,539 (298)
Fertilization is exceptionally complex and, depending on the species, happens in entirely different environments. External fertilizers in aquatic habitats, like marine invertebrates or fish, release their gametes into the seawater or freshwater, whereas sperm from most internal fertilizers like mammals cross the female genital tract to make their way ...
Wachten, D., Jikeli, J., Kaupp, U.
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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 +5 more
doaj +1 more source
Evolution of sperm size in nematodes: sperm competition favours larger sperm [PDF]
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
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ObjectiveReproductive hormones are a traditional good method to evaluate spermatogenesis but might not accurately represent local spermatogenesis. To find a more accurate method, seminal reproductive hormones were studied.MethodsA bidirectional cohort ...
Huang Liu +10 more
doaj +1 more source
Résumé Contexte Lacryoconservation des spermatozoïdes, méthode efficace pour préserver lafertilité masculine, est très avantageuse pour les hommes atteints de cancer.Malheureusement, comme les médecins et les patients atteints de cancersignorent les ...
Xiao Liu +11 more
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Objective: The aim of the study was to explore the evidence of JWRJD in the treatment of cryptozoospermia.Methods: A total of 162 cryptozoospermia patients with varicocele who refused to undergo surgery were included from January 2021 to December 2021 ...
Huang Liu +13 more
doaj +1 more source
Semen parameters are seriously affected in acephalic spermatozoa syndrome
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 +7 more
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Re-sperm collection with a short abstinence time: a strategy for successful cryopreservation in cryptozoospermia [PDF]
Background: Recent studies suggest that short-term abstinence may improve semen parameters; however, its impact on cryptozoospermia remains underexplored.
Wen-Rui Zhao +7 more
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For patients with severe oligozoospermia, cryopreservation of single human spermatozoa highlights its advantages. Previous research has focused on the development of micro-drop single sperm freezing methods with non-biological carriers over the past 20 ...
Shasha Liu +5 more
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BackgroundKlinefelter’s syndrome (KS) was once considered infertile due to congenital chromosomal abnormalities, but the presence of focal spermatozoa changed this.
Huang Liu +12 more
doaj +1 more source

