Results 1 to 10 of about 476,555 (360)
Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions [PDF]
Phys. Rev. E 78, 061903 (2008), 2008 Sperm swimming at low Reynolds number have strong hydrodynamic interactions when their concentration is high in vivo or near substrates in vitro. The beating tails not only propel the sperm through a fluid, but also create flow fields through which sperm interact with each other.
D. M. Woolley +5 more
arxiv +5 more sources
Does the FNA sperm retrieval failure prediction model work well for current NOA individuals undertaking risk screening before the operation? Model validation, high-risk population identification and potential alternative sperm retrieval exploration [PDF]
BMC Medical Informatics and Decision MakingBackground Non-obstructive azoospermia (NOA), the severe type of male infertility. The objective of this study was to evaluate the predictive accuracy of a prediction model of sperm retrieval failure with fine needle aspiration (FNA).
Xiaohui Jiang +7 more
doaj +2 more sources
Sperm Competition and Sperm Length in Shorebirds [PDF]
The Condor, 1999 We investigated how sperm morphology varies across 16 species of shorebirds in the Scolopa- cidae, Charadriidae, and Jacanidae. Sperm were sig- nificantly longer in nonmonogamous than in socially monogamous species.
Johnson, D D P, Briskie, J V
openaire +4 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 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 swimming ...
Malo Valenzuela, Aurelio F. +5 more
openaire +4 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
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
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
Cells, 2022 Preservation of human spermatozoa in vitro at normothermia or hypothermia maintaining their functions and fertility for several days plays a significant role in reproductive biology and medicine.
Qingyuan Cheng +8 more
doaj +1 more source