Results 41 to 50 of about 132,648 (346)
Hydrodynamic phase-locking of swimming microorganisms [PDF]
Phys. Rev. Lett. (2009) 103, 088101, 2009 Some microorganisms, such as spermatozoa, synchronize their flagella when swimming in close proximity. Using a simplified model (two infinite, parallel, two-dimensional waving sheets), we show that phase-locking arises from hydrodynamics forces alone, and has its origin in the front-back asymmetry of the geometry of their flagellar waveform.
arxiv +1 more source
Spermatozoa: A Historical Perspective.
International journal of fertility & sterility, 2018 ABSTRACT: The 100,000th scientific article on the subject of spermatozoa was recently published. Numerous studies evaluated the characteristics of this important cell that led to tremendous discoveries. Since its first observation and description in 1677, many important characteristics have been described regarding this highly fascinating gamete.
Puerta Suárez, Jenniffer +2 more
openaire +6 more sources
Bio-Functional Sperm Parameters: Does Age Matter?
Frontiers in Endocrinology, 2020 The evaluation of biofunctional sperm parameters can explain some cases of idiopathic male infertility. Among these, sperm DNA fragmentation (fDNA) is the most studied biofunctional sperm parameter.
Rosita A. Condorelli +7 more
doaj +1 more source
PLoS ONE, 2021 The aim of this study was to assess the dose- and time-dependent in vitro effects of ferrous sulphate (FeSO4.7H2O) on the motility parameters, viability, structural and functional activity of bovine spermatozoa.
Zuzana Knazicka +9 more
doaj +1 more source
Motilitas dan Viabilitas Spermatozoa Sapi Rambon di Desa Kemiren Banyuwangi
Jurnal Medik Veteriner, 2018 Sapi Rambon merupakan salah satu sapi lokal Indonesia. Tahun 2017 populasi sapi Rambon mengalami penurunan. Salah satu upaya pelestarian sapi lokal adalah melalui peningkatan populasi sapi dan inseminasi buatan.
Zeni Prastika +4 more
doaj +1 more source
Structural Abnormalities of Spermatozoa in Triploid Gynogenetic Crucian Carp (Carassius auratus)
Frontiers in Genetics, 2021 The spermatozoa of triploid gynogenetic crucian carp (Carassius auratus) (3nDTCC) possess a spermatogenesis process with a normal genetic background. However, the genetic materials of these spermatozoa do not completely inherit gynogenetic progeny in ...
Wangchao He +10 more
doaj +1 more source
Frontiers in Veterinary Science, 2023 After artificial insemination, immune cells such as polymorphonuclear neutrophils will be recruited into the genital tract and induce endometrial inflammation, adversely affecting the spermatozoa.
Yanbing Li +11 more
doaj +1 more source
The long-time dynamics of two hydrodynamically-coupled swimming cells [PDF]
Bull. Math. Biol. (2010) 72, 973-1005, 2009 Swimming micro-organisms such as bacteria or spermatozoa are typically found in dense suspensions, and exhibit collective modes of locomotion qualitatively different from that displayed by isolated cells. In the dilute limit where fluid-mediated interactions can be treated rigorously, the long-time hydrodynamics of a collection of cells result from ...
arxiv +1 more source
Mitochondria in teleost spermatozoa
Mitochondrion, 2017 There is an extraordinary diversity of reproductive modes in teleost and this variability is related to the phylogenetic relationships and adaption to very different biotopes. As in all vertebrates, sperm is produced as the end product of the process of spermatogenesis, and regarding teleost the spermatozoa lack an acrosome in almost all species and ...
Patricio Ulloa-Rodríguez +5 more
openaire +5 more sources
Species difference in the expression of Fas and Fas ligand in mature mammalian spermatozoa
Czech Journal of Animal Science, 2017 Although it has been proposed that the Fas and Fas ligand (FasL) may protect ejaculated spermatozoa against apoptosis induced by lipoperoxidative damage and against lymphocytes present in the female genital tract, studies reported conflicting results on ...
Youwei Li +7 more
doaj +1 more source