Results 11 to 20 of about 316,099 (294)
Evolution of sperm size in nematodes: sperm competition favours larger sperm [PDF]
Proceedings of the Royal Society 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 Lamunyon
exaly +3 more sources
Psychological and physiological adaptations to sperm competition in humans [PDF]
, 2005 Postcopulatory competition between males, in the form of sperm competition, is a widespread phenomenon in many animal species. The extent to which sperm competition has been an important selective pressure during human evolution remains controversial ...
Pound, N, Goetz, AT, Shackelford, TK
core +6 more sources
Post-Thaw Sperm Recovery Rates; A Retrospective Study
Fertility & Reproduction, 2022 Background: Cryopreservation is currently the only fertility preservation option available to patients undergoing gonadotoxic treatment. Much research in the field focusses on techniques, media and equipment employed to cryopreserve cells, and ...
Pui Ying LEUNG +4 more
doaj +1 more source
Validation of sORP, a Measure of Oxidative Stress, in Australian Population
Fertility & Reproduction, 2022 Background: Excessive reactive oxygen species are normally eliminated by seminal plasma free radical antioxidant scavengers and enzymes. Assessing the oxidation reduction potential of seminal fluid (mV/million sperm/mL) enables the detection of an ...
Yu-Cih SHIH +4 more
doaj +1 more source
Sperm design and sperm function [PDF]
Biology Letters, 2006 Abstract Spermatozoa vary enormously in their form and dimensions, both between and within species, yet how this variation translates into fertilizing efficiency is not known. Sperm swimming velocity is a key determinant of male fertilization success, but previous efforts to identity which sperm phenotypic traits are associated with ...
Malo Valenzuela, Aurelio F. +5 more
openaire +3 more sources
Sperm Viability and Sperm Competition in Insects [PDF]
Current Biology, 2002 Uploaded by Plazi for TaxoDros. We do not have abstracts.
Hunter, F.M, Birkhead, T.R
openaire +3 more sources
External quality assessment scheme for sperm DNA fragmentation: a pilot study in China
Basic and Clinical Andrology, 2023 Background The aim of this article is to establish an external quality assessment (EQA) scheme for sperm Deoxyribonucleic acid (DNA) fragmentation (SDF) detection, and to assess the feasibility of the scheme.
Yan Zheng +9 more
doaj +1 more source
Reproductive Biology and Endocrinology, 2022 Follicle-stimulating hormone signaling is essential for the initiation and early stages of spermatogenesis. Follicle-stimulating hormone receptor is exclusively expressed in Sertoli cells.
Jia-Ming Wang +3 more
doaj +1 more source
Bladder Neck Obstruction: Experience and Management in a Sperm Bank
Life, 2023 Primary Bladder Neck Obstruction (PBNO) management provides medical and surgical treatment, such as transurethral incisions that can lead to retrograde ejaculation.
Maria Neve Hirsch +9 more
doaj +1 more source
Automated Sperm Immobilization for Intracytoplasmic Sperm Injection [PDF]
IEEE Transactions on Biomedical Engineering, 2011 Sperm immobilization is a requisite step in intracytoplasmic sperm injection (ICSI). Conventionally, sperm immobilization is performed manually, which entails long training hours and stringent skills. Manual sperm immobilization also has the limitation of low success rates and poor reproducibility due to human fatigue and skill variations across ...
Clement Leung +4 more
openaire +2 more sources