Results 131 to 140 of about 216,536 (392)

Selection of normal spermatozoa with a vacuole‐free head (x6300) improves selection of spermatozoa with intact DNA in patients with high sperm DNA fragmentation rates

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, F. Boitrelle, F. Ferfouri, François Vialard, M. Bergère, B. Wainer, M. Bailly, Martine Albert, J. Selva   +8 more
semanticscholar   +1 more source

Parental Age, Inbreeding and Incubation Method Influence Extremely Low Hatching Success in the Ex‐Situ Population of the Extinct in the Wild Sihek

Animal Conservation, EarlyView.
Reproductive success rates are a key parameter determining the recovery potential of ex‐situ managed threatened species, with high rates often being required to produce offspring for wild releases while ensuring ex situ population viability. Here, we quantify reproductive success rates in the Extinct in the Wild sihek (Guam kingfisher) and find ...
Matthew J. Mitchell, Ryan N. Felice, John G. Ewen, Gina M. Ferrie, Erica Royer, Suzanne Medina, Scott Newland, Amanda E. Trask   +7 more
wiley   +1 more source

Morphology, morphometry and ultrastructure of the Amazonian manatee (Sirenia: Trichechidae) spermatozoa

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, Carolina M. Lucci, Fernando C. W. Rosas, Vera M. F. da Silva, Sônia N. Báo   +4 more
doaj   +1 more source

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus [PDF]

, 2017
Two hundred and seven individuals (103 females and 104 males) of bluemouth Helicolenus dactylopterus (Scorpaeniformes, Sebastidae), a commercially important deep-water species with an unusual reproductive strategy, from the eastern Atlantic Ocean ranging
Barcellos, Brown-Peterson, Canario, Dahle, Eldridge, Grier, Grier, Guerreiro, Howell, Hureau, Kime, Kobayashi, Liley, Matsuyama, Muñoz, Muñoz, Nagahama, Rinchard, Schulz, Scott, Sequeira, Sequeira, Sequeira, Sequeira, Shimizu, Shinomiya, Takano, Vila, Wallace, West, Wourms   +30 more
core   +1 more source

The Effect of Assisted Reproductive Technologies on Human Sex Ratios

Australian and New Zealand Journal of Obstetrics and Gynaecology, EarlyView.
ABSTRACT Background Modern assisted reproductive technology (ART), including pre‐implantation genetic testing for aneuploidy (PGT‐A), has opened new avenues in understanding early embryonic events and has simultaneously raised questions about the impact of ART itself on sex ratios.
Ektoras X. Georgiou, Yossi Mizrachi, Rebecca Kelley, Sharyn Stock‐Myer, John Stevens, David K. Gardner, Alex Polyakov   +6 more
wiley   +1 more source

Structure and behaviour of the sperm terminal filament [PDF]

, 1982
Light- and electron-microscopic observations of Ciona and Lytechinus spermatozoa show a thin terminal filament at the distal end. The terminal filament is 5-6 microns long and contains the two central microtubules and a variable number of A-tubule ...
Brokaw, C. J., Omoto, C. K.
core  

Testicular histopathology and its association with germ cell numbers, serum concentrations of reproductive hormones, and semen quality

Andrology, EarlyView.
Abstract Background It is well‐established that spermatogenesis, semen quality, and reproductive hormones are interlinked. It is, however, less well‐described how various specific testicular histopathologies are linked to reproductive hormones and semen quality.
Gülizar Saritas, Nina Mørup, Trine H. Johannsen, Anders Juul, Lise Aksglaede, Sofia B. Winge, Kristian Almstrup   +6 more
wiley   +1 more source

A non‐hormonal reversible contraceptive targeting GSK3α, a protein kinase, essential for epididymal sperm maturation

Andrology, EarlyView.
Abstract Background and objectives Epididymal transit renders key competence to mammalian spermatozoa for fertilizing eggs. Generally, the two paralogs of glycogen synthase kinase 3, GSK3α and GSK3β, functionally overlap except in testis and sperm. We showed that GSK3α is essential for epididymal sperm maturation and fertilization.
Mustfa Kabi, Aditi Khamamkar, Kwaku Kyei‐Baffour, Michel Weïwer, Srinivasan Vijayaraghavan, Souvik Dey   +5 more
wiley   +1 more source

The use of deidentified organ donor testes for research

Andrology, EarlyView.
Abstract Our knowledge of testis development and function mainly comes from research using mammalian model organisms, primarily the mouse. However, there are integral differences between men and other mammalian species regarding cellular composition and expression profiles during fetal and post‐natal testis development and in the mature testis ...
Marina V. Pryzhkova, Marnie W. Skinner, Juliana I. Candelaria, Stephen R. Wellard, Philip W. Jordan   +4 more
wiley   +1 more source

Initial motility and vitality predict the semen quality after long‐term cryostorage, even in patients with restricted ejaculate parameters

Andrology, EarlyView.
Abstract Background Cryopreservation of human semen is the cornerstone for preserving male fertility before gonadotoxic therapy or in cases of high variability in semen parameters. This is particular crucial in cases of severe oligoasthenoteratozoospermia (OAT), where diminished sperm counts may compromise planned intracytoplasmic sperm injection (ICSI)
Simone Bier, Daniela Hanke, Michael Zitzmann, Sabine Kliesch, Verena Nordhoff   +4 more
wiley   +1 more source