Results 101 to 110 of about 205,391 (267)
CaMKIIalpha interacts with multi-PDZ domain protein MUPP1 in spermatozoa and prevents spontaneous acrosomal exocytosis [PDF]
, 2009 The success of acrosomal exocytosis, a complex process with a variety of inter-related steps, relies on the coordinated interaction of participating signaling molecules.
Ackermann, Frauke +5 more
core +1 more source
Irradiation of Sperm Tails by Laser Microbeam [PDF]
, 1969 1. Sea-urchin and starfish sperm tails were irradiated at pre-selected points along the flagellum and at pre-selected phases of the beat cycle by means of a pulsed ruby laser microbeam. Multiple-exposure dark-field photomicrographs were taken immediately
Goldstein, Stuart F.
core
Locomotion of C. elegans in Structured Environments [PDF]
arXiv, 2010 Undulatory locomotion of microorganisms like soil-dwelling worms and spermatozoa, in structured environments, is ubiquitous in nature. They navigate complex environments consisting of fluids and obstacles, negotiating hydrodynamic effects and geometrical constraints.
arxiv
Propulsion by stiff elastic filaments in viscous fluids [PDF]
, 2019 Flexible filaments moving in viscous fluids are ubiquitous in the natural microscopic world. For example, the swimming of bacteria and spermatozoa as well as important physiological functions at organ-level, such as the cilia-induced motion of mucus in the lungs, or individual cell-level, such as actin filaments or microtubules, all employ flexible ...
arxiv +1 more source
Andrologia, 2013 Intracytoplasmic morphologically selected sperm injection (IMSI, 6300× magnification with Nomarski contrast) of a normal spermatozoon with a vacuole‐free head could improve the embryo's ability to grow to the blastocyst stage and then implant.
I. Hammoud +8 more
semanticscholar +1 more source
Zoologia (Curitiba), 2010 This study describes the morphological, morphometric and ultrastructural characteristics of the Amazonian manatee Trichechus inunguis (Natterer, 1883) spermatozoon. The spermatozoa were obtained from a urine sample of an adult T.
Rodrigo S. Amaral +4 more
doaj +1 more source
Seminal plasma: an essential attribute to spermatozoa.
Journal of Andrology, 2012 The biochemical composition of seminal plasma (SP) is very complex and variable among species. Advances in reproductive technologies reveal SP as a nutritive-protective medium for sperm cells suspended in it, and some SP components are very important for
N. Juyena, C. Stelletta
semanticscholar +1 more source
Inhibition of movement of trition-demembranated sea-urchin sperm flagella by Mg2+, ATP4-, ADP and P1 [PDF]
, 1979 Three clinical patterns of inhibition of MgATP2--activated flagellar motility have been found by measuring the motility of Triton-demembranated sea-urchin spermatozoa beating with their heads attached to a glass surface.
Brokaw, C. J., Okuno, Makoto
core
, 2012 The ejaculated semen consists of two major components viz. sperm cells (spermatozoa) and the fluid part obtained after centrifugation called seminal plasma.
P Perumal
core +2 more sources
Why so many sperm cells? [PDF]
arXiv, 2014 A key limiting step in fertility is the search for the oocyte by spermatozoa. Initially, there are tens of millions of sperm cells, but a single one will make it to the oocyte. This may be one of the most severe selection processes designed by evolution, whose role is yet to be understood. Why is it that such a huge redundancy is required and what does
arxiv