News tagged with 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 | 5 / 5 (8) | 0 |
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 | 5 / 5 (7) | 0 |
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 | 4.3 / 5 (6) | 2 |
(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 | 3.1 / 5 (8) | 11 |
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 | 5 / 5 (5) | 0 |
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 | 4.8 / 5 (5) | 1 |
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 | 4.8 / 5 (5) | 1 |
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 | 4.2 / 5 (5) | 1 |
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 | 4.5 / 5 (4) | 4 |
(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 | 5 / 5 (3) | 0 |
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) | 0 |
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 | 5 / 5 (3) | 1 |
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 | 5 / 5 (3) | 0 |
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 | 5 / 5 (2) | 0
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 | 5 / 5 (2) | 0 |
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.
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.
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