News tagged with sperm
Study first to determine entire genetic sequence of individual human sperm
The entire genomes of 91 human sperm from one man have been sequenced by Stanford University researchers. The results provide a fascinating glimpse into naturally occurring genetic variation in one individual, ...
Genetics
Jul 19, 2012 |
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One cell is all you need: Innovative technique can sequence entire genome from single cell
The notion that police can identify a suspect based on the tiniest drop of blood or trace of tissue has long been a staple of TV dramas, but scientists at Harvard have taken the idea a step further. Using ...
Genetics
Jan 07, 2013 |
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Finally: A male contraceptive pill in the making?
The development of a male contraceptive pill has long proven to be elusive, but findings from a new study may point scientists in the right direction to making oral birth control for men a reality.
Medical research
Aug 16, 2012 |
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Men with deep voice may be lacking in sperm: study
(Medical Xpress) -- Women look for tall, dark and handsome. Those chiseled features and that deep sexy voice have gained the attention of women for generations. However, a new study published in PLoS ONE shows ...
Other
Jan 09, 2012 |
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Gene discovery points towards non-hormonal male contraceptive
A new type of male contraceptive could be created thanks to the discovery of a key gene essential for sperm development.
Genetics
May 24, 2012 |
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Revealed: How sticky egg captures sperm
Researchers have uncovered exactly how a human egg captures an incoming sperm to begin the fertilisation process, in a new study published this week in the journal Science.
Medical research
Aug 18, 2011 |
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Sperm crawl and collide on way to egg, researchers say
Scientists at the Universities of Birmingham and Warwick have shed new light on how sperm navigate the female reproductive tract, 'crawling' along the channel walls and swimming around corners; with frequent collisions.
Medical research
May 07, 2012 |
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Sperm coat protein may be key to male infertility
The loss of a protein that coats sperm may explain a significant proportion of infertility in men worldwide, according to a study by an international team of researchers led by UC Davis. The research could ...
Medical research
Jul 20, 2011 |
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Epigenetic reprogramming: Research discovers how epigenetic information could be inherited
New research reveals a potential way for how parents' experiences could be passed to their offspring's genes. The research was published today, 25 January, in the journal Science.
Genetics
Jan 24, 2013 |
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Better nutrition makes for better sperm
(Medical Xpress) -- A pair of studies presented today at the 67th Annual Meeting of the American Society for Reproductive Medicine (ASRM) show a link between dietary patterns and semen parameters in men: in short, better ...
Health
Oct 18, 2011 |
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Higher risk of birth defects from assisted reproduction
A University of Adelaide study has identified the risk of major birth defects associated with different types of assisted reproductive technology.
Obstetrics & gynaecology
May 06, 2012 |
3.8 / 5 (4) |
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Nutrition tied to improved sperm DNA quality in older men
A new study led by scientists from the Lawrence Berkeley National Laboratory (Berkeley Lab) found that a healthy intake of micronutrients is strongly associated with improved sperm DNA quality in older men. In younger men, ...
Health
Aug 27, 2012 |
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'Kick-starting' male fertility
Adding a missing protein to infertile human sperm can 'kick-start' its ability to fertilise an egg and dramatically increase the chances of a successful pregnancy, a team of Cardiff University scientists have uncovered.
Medical research
Sep 21, 2012 |
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Ultrasound male contraceptive, overlooked for decades, confirmed to work
Imagine a contraceptive that could, with one or two painless 15-minute non-surgical treatments, provide months of protection from pregnancy. And imagine that the equipment needed were already in physical therapists' ...
Other
Jan 30, 2012 |
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The end of the 'Lily of the Valley phenomenon' in sperm research?
According to a 2003 study by German and American scientists, a component of the Lily of the Valley scent known as Bourgeonal alters the calcium balance of human sperm and attracts the sperm. The "Lily of the Valley phenomenon" ...
Medical research
Feb 28, 2012 |
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Sperm
The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.
The spermatozoa of animals are produced through spermatogenesis inside the male gonads (testicles) via meiotic division. They are carried out of the male body in a fluid known as semen. Mammalian sperm cells can live for up to 3 days inside the female reproductive system.[citation needed]
Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.
For more information about Sperm, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
