Results 241 to 250 of about 157,835 (298)

Semen quality in patients with testicular cancer is associated with age and with greatly elevated levels of beta human chorionic gonadotropin

Andrology, EarlyView.
Abstract Background Poor semen quality is a well‐known feature in patients with testicular germ cell tumours (GCTs) at the time of diagnosis but the underlying biological reasons are incompletely understood. Objectives This study aimed to identify GCT‐specific clinical factors that are involved with poor semen quality in GCT patients.
Klaus‐Peter Dieckmann, Johanna Hochmuth‐Tisch, Andrea Salzbrunn, Cord Matthies, Kathrein von Kopylow, Marta Godlewska, Christian Wülfing, Uwe Pichlmeier, Armin Soave, Christian Guido Ruf   +9 more
wiley   +1 more source

The role of iron in normal and impaired testicular function

Andrology, EarlyView.
Abstract Iron plays a critical role in testicular physiology, impacting spermatogenesis, testosterone production, and overall testicular function. Iron homeostasis is maintained through systemic and cellular regulatory mechanisms, including hepcidin‐mediated systemic iron control and the iron‐responsive element/iron regulatory protein (IRE/IRP) system ...
Aileen Harrer, Esther G. Meyron‐Holtz, Andreas Meinhardt   +2 more
wiley   +1 more source

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An Ecology of Sperm: Sperm Diversification by Natural Selection

Annual Review of Ecology, Evolution, and Systematics, 2015
Using basic ecological concepts, we introduce sperm ecology as a framework to study sperm cells. First, we describe environmental effects on sperm and conclude that evolutionary and ecological research should not neglect the overwhelming evidence presented here (both in external and internal fertilizers and in terrestrial and aquatic habitats) that ...
Klaus Reinhardt, Ralph Dobler, Jessica Abbott   +2 more
openaire   +3 more sources

Sperm selection by females

Nature, 1996
Mats Olsson, Richard Shine, Thomas Madsen, Annica Gullberg, Håkan Tegelström   +4 more
openaire   +3 more sources

Machine learning for sperm selection

Nature Reviews Urology, 2021
Infertility rates and the number of couples seeking fertility care have increased worldwide over the past few decades. Over 2.5 million cycles of assisted reproductive technologies are being performed globally every year, but the success rate has remained at ~33%.
Jae Bem You, Christopher McCallum, Yihe Wang, Jason Riordon, Reza Nosrati, David Sinton   +5 more
openaire   +2 more sources

Sperm Selection Technology in ART

Seminars in Reproductive Medicine, 2021
AbstractIntracytoplasmic sperm injection (ICSI) is a commonly used in vitro fertilization technique. Selection of sperm for injection is currently done using subjective assessment of morphology, which may not accurately identify the best-quality sperm.
Catherine Martin, Emma Woodland
openaire   +2 more sources

Sperm competition games: sperm selection by females

Journal of Theoretical Biology, 2003
We analyse a co-evolutionary sexual conflict game, in which males compete for fertilizations (sperm competition) and females operate sperm selection against unfavourable ejaculates (cryptic female choice). For simplicity, each female mates with two males per reproductive event, and the competing ejaculates are of two types, favourable (having high ...
M A, Ball, G A, Parker
openaire   +2 more sources

Sperm Selection: Effect on Sperm DNA Quality

2013
The selection of spermatozoa without DNA fragmentation and chromosomal diseases prior to assisted reproductive techniques helps to optimize the outcome of the treatment; in particular, sperm selection prior to in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) is crucial.
Lodovico, Parmegiani, Graçiela Estela, Cognigni, Marco, Filicori   +2 more
openaire   +2 more sources

Microfluidic Sperm Selection

2020
With advances in assisted reproduction techniques, the degree of demand on the male gamete has decreased to such a level that the role of the sperm has been reduced to a mere packet of DNA to be released into the cytoplasm of the oocyte. Now, we know that regardless of appearance, this package may contain unpleasant surprises such as sperm DNA damage ...
Hamilton de Martin, Guilherme J. A. Wood, Pedro Augusto A. Monteleone   +2 more
openaire   +1 more source

Sperm longevity following pre-freeze sperm selection

Journal of Equine Veterinary Science, 2012
centrifugation improves cryosurvival after delayed cryopreservation, as compared to the standard centrifugation processing. Moreover, centrifugation processing directly after semen collection and storage of selected sperm was compared with centrifugation of stored sperm just prior to cryopreservation.
M. Hoogewijs, S. Piepers, J. Govaere, C. De Schauwer, A. de Kruif, J. Morrell   +5 more
openaire   +1 more source