Results 21 to 30 of about 267,539 (298)

Sperm Sensory Signaling [PDF]

open access: yesCold Spring Harbor Perspectives in Biology, 2017
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.
openaire   +3 more sources

Does air pollution exposure affect semen quality? Evidence from a systematic review and meta-analysis of 93,996 Chinese men

open access: yesFrontiers 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   +5 more
doaj   +1 more source

Evolution of sperm size in nematodes: sperm competition favours larger sperm [PDF]

open access: yesProceedings 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
C W, LaMunyon, S, Ward
openaire   +2 more sources

“Seminal testosterone”, rising viewpoint of local spermatogenesis in nonobstructive azoospermia: One center long-term bidirectional cohort study

open access: yesFrontiers in Endocrinology, 2022
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

Male cancer patient sperm cryopreservation for fertility preservation: 10-year monocentric experience

open access: yesBasic and Clinical Andrology, 2021
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
doaj   +1 more source

Jiawei Runjing Decoction Improves Spermatogenesis of Cryptozoospermia With Varicocele by Regulating the Testicular Microenvironment: Two-Center Prospective Cohort Study

open access: yesFrontiers in Pharmacology, 2022
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

open access: yesBasic 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   +7 more
doaj   +1 more source

Re-sperm collection with a short abstinence time: a strategy for successful cryopreservation in cryptozoospermia [PDF]

open access: yesJournal 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   +7 more
doaj   +1 more source

Cryopreservation of single-sperm from semen and testicular samples: a 5-year monocentric experience in hundreds of patients

open access: yesReproductive Biology and Endocrinology
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
doaj   +1 more source

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

open access: yesFrontiers 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   +12 more
doaj   +1 more source

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