Quantcast

Latest Sperm Stories

2012-05-01 09:44:46

Experts from Durham University have identified a new gene that could help the development of fertility treatments in humans in the future. Scientists from Durham University, UK, and Osaka University, Japan, looking at fertility in mice, have discovered for the first time that the gene, which makes a protein called PDILT, enables sperm to bind to an egg, a process essential to fertilization. The team found that when the gene was 'switched off' in male mice, less than three per cent of...

2012-04-03 10:02:30

A study in The Journal of Cell Biology describes how a secreted enzyme helps egg cells avoid being fertilized by more than one sperm. Because polyspermy disrupts embryonic development, oocytes take several steps to ensure they only fuse with a single sperm. One key step is to prevent additional sperm from binding to the surface of an already-fertilized egg, a blockade that involves the release of secretory granules and cleavage of a protein called ZP2, a component of the zona pellucida...

2012-03-08 00:54:06

The speed at which the calcium concentration in the cell changes controls the swimming behavior of sperm. They can calculate the calcium dynamics and react accordingly. Sperm have only one aim: to find the egg. The egg supports sperm in their quest by emitting attractants that induce changes in the calcium level inside sperm. Calcium ions determine the beating pattern of the sperm tail which enables sperm to steer. Together with colleagues from the Max Planck Institute for the Physics of...

2012-02-29 14:09:28

It had long been assumed that the human sperm cell´s mission in life ended once it had transferred its freight of parental DNA to the egg. More recently however, other components of sperm have been implicated in fertilization, and perhaps even in subsequent embryonic development. In a new study appearing in the Proceedings of the Royal Society, Timothy Karr, a researcher at Arizona State University´s Biodesign Institute, along with colleagues from the Universities of Cambridge...

2012-02-29 00:30:32

Sperm cannot detect smells. 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” — also the title of a book about smelling — was born as a result of this discovery that sperm act as swimming olfactory cells which follow a “scent trail” laid by the egg. However, a detailed explanation...

2012-02-16 15:05:52

Yale researchers have discovered how the "guardian of the genome'' oversees quality control in the production of sperm – and perhaps in many other cells as well. The research published online Feb. 16 in the journal Current Biology opens up the potential of developing new forms of birth control and fertility treatment – and even new ways to combat many forms of cancer. Sperm and other cells go through a sort of inspection process triggered by a key regulatory gene, p53, which...

2012-02-03 06:22:31

(Ivanhoe Newswire)--The perfect male birth control contraceptive would be cheap, reliable, and reversible. It would have few side effects and would be long lasting. A new study used therapeutic ultrasound equipment in the sperm count reduction of male rats to levels which would result in infertility in humans. Ultrasound's capabilities as a male contraceptive were first acknowledged almost 40 years ago. Although the equipment used back then is now outdated and no longer around, researchers...

Simple, Reversible, Inexpensive Male Contraception Tested
2012-01-30 11:09:46

Is there a simple, inexpensive, reversible male contraceptive coming to a clinic near you soon? A quick visit to a doctor´s office may soon be all that is needed for males to do their part for contraception. The journal Reproductive Biology and Endocrinology details a study using commercially available therapeutic ultrasound equipment to reduce sperm counts of male rats to levels which would result in infertility in humans. A team led by the University of North Carolina´s Dr....

2012-01-30 09:15:58

A new study shows the production of sperm is more biologically taxing than previously thought, and expending energy on it has significant health implications. In research published in PLoS ONE, Dr Damian Dowling of Monash University's School of Biological Sciences and Professor Leigh Simmons of the University of Western Australia have investigated the trade-off between sperm quality and immunity. The researchers used the Australian cricket, Teleogryllus oceanicus to prove that the...

2012-01-10 11:17:06

Who knew that male fertility depends on sperm-cell architecture? A University of Illinois study reports that a certain omega-3 fatty acid is necessary to construct the arch that turns around, immature sperm cell into a pointy-headed super swimmer with an extra long tail. "Normal sperm cells contain an arc-like structure called the acrosome that is critical in fertilization because it houses, organizes, and concentrates a variety of enzymes that sperm use to penetrate an egg," said Manabu...


Word of the Day
bibliopole
  • A bookseller; now, especially, a dealer in rare and curious books.
This word comes from a Greek phrase meaning 'book seller.'
Related