Results 21 to 30 of about 55,911 (260)
Asian Pacific Journal of Reproduction, 2021 Objective: To study the effect of mobile emitted radio frequency electromagnetic radiation (RF-EMR) on sperm parameters (sperm count, viability, motility, progressivity, and morphology) and ameliorative effect of pomegranate juice in rats.
Anjaneyababu Naik Banavath +1 more
doaj +1 more source
Sperm morphology and the evolution of intracellular sperm–egg interactions [PDF]
Ecology and Evolution, 2018 AbstractSperm morphology is incredibly diverse, even among closely related species, yet the coevolution between males and females of fertilization recognition systems is necessary for successful karyogamy (male and female pronuclear fusion). In most species, the entire sperm enters the egg during fertilization so sperm morphological diversity may ...
Helen M. Southern +3 more
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Extensive variation in sperm morphology in a frog with no sperm competition [PDF]
BMC Evolutionary Biology, 2016 Recent comparative studies of several taxa have found that within-species variation in sperm size decreases with increasing levels of sperm competition, suggesting that male-male gamete competition selects for an optimal sperm phenotype. Previous studies of intraspecific sperm length variation have all involved internal fertilizers where some other ...
Stewart, Kathryn A. +2 more
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Sperm morphology and evidence for sperm competition among parrots [PDF]
Journal of Evolutionary Biology, 2019 AbstractSperm competition is an important component of post‐copulatory sexual selection that has shaped the evolution of sperm morphology. Previous studies have reported that sperm competition has a concurrently directional and stabilizing effect on sperm size.
Luisana Carballo +6 more
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Effects of season and single layer centrifugation on bull sperm quality in Thailand [PDF]
Asian-Australasian Journal of Animal Sciences, 2020 Objective The aim of study was to investigate the effects of season and single layer centrifugation (SLC) before cryopreservation on post-thaw bull sperm quality in Thailand.
Thanapol Nongbua +5 more
doaj +1 more source
Comparison of Special Stains for Analysing the Morphology of Sperm: A Cross-sectional Study [PDF]
National Journal of Laboratory MedicineIntroduction: In India, male infertility constitutes 40% of infertility cases in males, which has become a serious problem in developing countries. Numerous studies and advanced techniques have been identified in assessing sperm morphology. The detection
Preethi Murali +2 more
doaj +1 more source
Sperm Morphology and Male Age in Black-Throated Blue Warblers, an Ecological Model System
Animals, 2020 Extra-pair paternity may drive selection on spermatozoa and ejaculate characteristics through sperm competition and cryptic female choice. Here, we examine sperm morphology in the black-throated blue warbler (Setophaga caerulescens), an ecological model ...
Emily Cramer +3 more
doaj +1 more source
Relationship between sperm morphology and sperm DNA dispersion
Translational Andrology and Urology, 2020 The pathogenesis of teratozoospermia (30%) and a higher odds ratio (OR) for having high SDF levels were found in the group of men with teratozoospermia vs. men without teratozoospermia. However, the receiving operating characteristic (ROC) curve analysis indicated that a SDF >18% was a significant negative predictive value to distinguish between men ...
Jakubik-Uljasz, Joanna +3 more
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Effect of Phaleria macrocarpa on Sperm Characteristics in Adult Rats [PDF]
Advanced Pharmaceutical Bulletin, 2013 Purpose: The purpose of this study was to determine the effects of Phaleria macrocarpa (PM) on male fertility by assessing its effect on the sperm characteristics which included the sperm count, motility, viability and morphology.
Saadat Parhizkar +2 more
doaj +1 more source
Prevalence of Abnormal Semen Parameters among Male Patients Attending the Fertility Center in Khartoum, Sudan [PDF]
Journal of Medical and Life Science, 2022 Background: More than 70 million couples worldwide are affected by infertility. With a male factor infertility account for about half of the cases. Semen analysis is critical for determining male fertility potential. Objective: To estimate the prevalence
Alaa Ali +3 more
doaj +1 more source