Results 31 to 40 of about 83,183 (339)
International Brazilian Journal of Urology, 2015 Main findings: An intriguing yet perplexing case report of a successful pregnancy and live birth with intracytoplasmic sperm injection using normal testicular sperm, after the finding of azoospermia in the semen analysis and discovering only tail stump ...
Betina B. Povlsen +4 more
doaj +1 more source
Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions [PDF]
, 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
D. M. Woolley +5 more
core +2 more sources
A Noninvasive Method For In situ Determination of Mating Success in Female American Lobsters (Homarus americanus) [PDF]
, 2014 Despite being one of the most productive fisheries in the Northwest Atlantic, much remains unknown about the natural reproductive dynamics of American lobsters.
Dubofsky, Elizabeth A. +3 more
core +106 more sources
Journal of Animal Reproduction and Biotechnology, 2016 The recovery of epididymal sperm in animals is considered as one of the important tools to preserve high value or endangered species. However, there are no appropriate castrating indicators such as months of age in bull, sperm morphology, and motility ...
Sung-Sik Kang +11 more
doaj +1 more source
Variation in apical hook length reflects the intensity of sperm competition in murine rodents. [PDF]
PLoS ONE, 2013 BackgroundPost-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity.MethodologyHere we ...
Martin Šandera +2 more
doaj +1 more source
The coupling apparatus of the sperm head and tail†
Biology of Reproduction, 2020 AbstractA strong sperm head–tail coupling apparatus (HTCA) is needed to ensure the integrity of spermatozoa during their fierce competition to fertilize the egg. A lot of HTCA-specific components have evolved to strengthen the attachment of the tail to the implantation fossa at the sperm head.
Bingbing, Wu +3 more
openaire +2 more sources
Frontiers in Cell and Developmental Biology, 2019 Terminal differentiation of male germ cells into functional spermatozoa requires shaping and condensation of the nucleus as well as the formation of sperm-specific structures. A transient microtubular structure, the manchette, is mandatory for sperm head
Constanza Tapia Contreras +1 more
doaj +1 more source
Cryoprotectant-free vitrification of human spermatozoa in new artificial seminal fluid [PDF]
, 2016 Vitrification is a new method that has been recently introduced in Assisted Reproduction Technique programs. The aim of this study was to design a new medium similar to normal human seminal fluid (SF), formulation artificial seminal fluid (ASF), and to ...
Agha Rahimi, A. +4 more
core +1 more source
Human sperm RNA code senses dietary sugar. [PDF]
, 2020 A new study reveals that a high-sugar diet acutely alters human sperm small RNA profiles after 1 week and that these changes are associated with changes in sperm motility.
Chen, Qi, Zhang, Ying
core +1 more source
Scientific Reports, 2021 Sperm cells can move at a high speed in biofluids based on the flexible flagella, which inspire novel flagellar micro-/nanorobots to be designed. Despite progress in fabricating sperm-type robots at micro scale, mass fabrication of vivid sperm-like ...
Nuoer Celi, De Gong, Jun Cai
doaj +1 more source