Results 91 to 100 of about 129,614 (356)
Sorting of Chiral Microswimmers [PDF]
Soft Matter 9, 6347-6542, 2013, 2012 Microscopic swimmers, e.g., chemotactic bacteria and cells, are capable of directed motion by exerting a force on their environment. For asymmetric microswimmers, e.g., bacteria, spermatozoa and many artificial active colloidal particles, a torque is also present leading in two dimensions to circular motion and in three dimensions to helicoidal motion ...
arxiv +1 more source
Journal of Clinical Endocrinology and Metabolism, 2008 CONTEXT Male infertility has been linked with the excessive generation of reactive oxygen species (ROS) by defective spermatozoa. However, the subcellular origins of this activity are unclear.
A. Koppers +4 more
semanticscholar +1 more source
Motility of spermatozoa at surfaces [PDF]
Reproduction, 2003 The hydrodynamic basis for the accumulation of spermatozoa at surfaces has been investigated. The general conclusion is that when spermatozoa arrive at a surface, they will remain there if the vector of the time-averaged thrust is directed towards that surface. This can arise in two basic ways.
openaire +4 more sources
The ductal network in the human testis and epididymis: What belongs to which?
Clinical Anatomy, EarlyView.Abstract The testes and epididymis are traversed by a system of tubules in which sperm cells are generated, matured, nourished, and transported. Among these are the efferent ductules, which connect the rete testis to the duct of the epididymis. In the Terminologia Anatomica (TA), the efferent ductules are assigned to the testicles, while numerous ...
Andreas Gocht +3 more
wiley +1 more source
Jurnal Ilmiah Ilmu-Ilmu Peternakan, 2012 This research was conducted to determine the quality and proportion of Y-spermatozoa with more fraction of egg white and storage period. The experimental method with completely Randomized Design base on Factorial consist of two factor were used.
Tedi Akhdiat
doaj +3 more sources
Energy saving mechanisms, collective behavior and the variation range hypothesis in biological systems: A review [PDF]
BioSystems 147 (2016) 40-66, 2016 Energy saving mechanisms are ubiquitous in nature. Aerodynamic and hydrodynamic drafting, vortice uplift, Bernoulli suction, thermoregulatory coupling, path following, physical hooks, synchronization, and cooperation are only some of the better-known examples.
arxiv +1 more source
Journal of Cell Science, 2013 Summary DNA repair has long been considered impossible in human spermatozoa due to the high level of DNA compaction observed in these cells. However, detailed examination of the base excision repair pathway in human spermatozoa has revealed the presence ...
T. Smith +5 more
semanticscholar +1 more source
On the Development and Functions of the Spermatozoa [PDF]
The American Journal of the Medical Sciencesn ...
Wagner, &Na;, Leuckardt, &Na;
openaire +3 more sources
Cytoskeleton, EarlyView.ABSTRACT Myosin VI has been reported by others to localize in association with various regions of apical tubulobulbar complexes (TBCs) at sites of attachment between Sertoli cells and late spermatids in the mouse. Tubulobulbar complexes internalize “intact” intercellular junctions during sperm release and during spermatocyte translocation through the ...
Samuel Tretjakov +2 more
wiley +1 more source
The escape problem for mortal walkers [PDF]
J. Chem. Phys. 146, 084106 (2017), 2016 We introduce and investigate the escape problem for random walkers that may eventually die, decay, bleach, or lose activity during their diffusion towards an escape or reactive region on the boundary of a confining domain. In the case of a first-order kinetics (i.e., exponentially distributed lifetimes), we study the effect of the associated death rate
arxiv +1 more source