Science Resources RSS Feeds
|
 |
 |
 |
Sperm Current Events | Sperm News
|
| Page
1 of
11 |
211 Results |
|
|
|
Sort By:
Page Views | Date |
Sporty Sperm: A Stiff One Gets the Job Done More Quickly
A scientist who studies the phsyics of sperm "as a hobby" is challenging the current understanding of how sperm swim towards an egg. At the Society for Experimental Biology conference today Dr Christopher Lowe will present the results of his modelling of a sperm`s tail, suggesting we may need to re-think our assumptions of how sperm move through... view more... (2002-04-10)
Stiff competition: size matters
Are longer sperm more successful than shorter sperm in the race for life? This is one of the questions Dr. Matthew Gage (University of East Anglia) will be addressing on Wednesday 31st March 2004 at the annual SEB meeting in Edinburgh (29th March - 2nd April 2004). Dr. Gage will present evidence that sperm speed, size and shape all matter when it... view more... (2004-03-26)
Sophisticated sexual behavior in roosters
In the animal world, it's common for females to mate with several males during one and the same reproductive period. This leads to sperm competition, that is, sperm from several different males compete to fertilize the egg at the same time. The most common response to increased sperm competition is for males to increase the number of sperm cells... view more... (2003-11-10)
Genomic imprinting in disruptive spermatogenesis (p 1700)
Low sperm counts could be associated with genomic imprinting disease and could carry a raised risk of transmitting imprinting defects following assisted reproductive technologies, claim researchers in this week's issue of THE LANCET. Genomic imprinting is a gene regulatory mechanism based on differential methylation, whereby only one of two... view more... (2004-05-19)
Protein translation in sperm
A new paper in the February 15th issue of Genes & Development lends novel insight into the cellular changes that occur in sperm while they reside in the female reproductive tract. view more (2006-02-15)
Researchers set standard for male fertility
Researchers in Leeds and the USA have developed a ‘gold standard’ for fertile sperm, in a major step towards understanding male infertility. In an article published in The Lancet, (pp772 06/09/2002) the researchers explain how they analysed genetic fingerprints from a range of sperm samples. Sperm cells have a complex genetic... view more... (2002-09-06)
Mother's genes determine sperm design
A new study at the University of Sheffield, published today in Nature, has found that the size and shape of a zebra finch's sperm are genetically passed down from the mother, a fact that may also be true in humans. The paper Genetic effects on sperm design in the zebra finch, also suggests that when sperm operate in a non-competitive environment... view more... (2005-03-15)
Quality control mechanism tags defective sperm cells inside the body
Defective sperm cells do not pass through the body unnoticed. A new University of Missouri study provides evidence that the body recognizes and tags defective sperm cells while they undergo maturation in the epididymis, a sperm storage gland attached to the testis. view more (2008-01-24)
Sperm may play leading role in spreading HIV
Sperm, and not just the fluid it bathes in, can transmit HIV to macrophages, T cells, and dendritic cells (DCs), report a team led by Ana Ceballos at the University of Buenos Aires in Argentina. view more (2009-10-26)
'The snip' may have irreversible effects on sperm
Scientists call for more research into the long-term effects of vasectomy, as results revealed today(1) suggest that the effects of 'the snip' might not be as "reversible" as previously thought. Work led by Dr Sheena Lewis at Queen's University Belfast on testicular biopsies shows that men who had a vasectomy more than 10 years ago have... view more... (2004-03-30)
Viagra may affect fertility
Researchers from Belfast reveal today that men who take Viagra when they are hoping to start a family could be affecting their fertility. A group lead by Dr Sheena Lewis at the Department of Obstetrics and Gynaecology at Queen's University Belfast have shown that while Viagra enhances sperm motility it also seems to speed up the 'acrosome... view more... (2004-03-31)
Low sperm count linked to organic solvents
Men repeatedly exposed to organic solvents are over twice as likely to have a low sperm count, reports a study in Occupational and Environmental Medicine. The higher the level of exposure the greater was the risk, with professional printers and painters and decorators most at risk, the study shows. The research team focused on over 1200 manual... view more... (2001-09-07)
Sperm created in the laboratory from embryonic stem cells produce viable progeny
Scientists have demonstrated for the first time that embryonic stem (ES) cells cultured in the laboratory can produce sperm with the capacity to produce viable offspring. view more (2006-07-12)
Saving Sperm For A Later Date
The Monty Python song was right: every sperm is sacred - if you're living in the promiscuous world of chickens that is. Scientists studying the evolution of reproductive behaviour have shown that cockerels use sophisticated strategies to maximise reproductive return from limited sperm reserves. University of Leeds researcher Dr. Tom Pizzari said:... view more... (2003-11-03)
The precise role of seminal proteins in sustaining post-mating responses in fruit flies
Successful reproduction is critical to pass genes to the next generation. In sexually reproducing organisms, sperm enter the female with seminal proteins that are vital for fertility. view more (2007-12-18)
Low sperm count may be associated with prenatal testosterone excess
Exposure to an excess of sexual steroids, like testosterone, during fetal development may be a potential risk factor for low sperm count and motility. view more (2008-09-23)
The secret sex life of seaweed revealed
Melbourne researchers have revealed for the first time the sex lives of red seaweed using sophisticated time-lapse video microscopy. "Until now, no one knew what exactly happens when these seaweeds become sexy," says University of Melbourne researcher, Dr Sarah Wilson. "Despite the fact that red seaweed is worth hundreds of millions... view more... (2002-08-18)
Hopes raised for cancer survivors who wish to be fathers
A study at the University of Edinburgh into the fertility of men who have survived chemotherapy and radiotherapy treatment for childhood cancer and leukaemia shows that despite generally low sperm counts , the DNA carried by their sperm appears to be undamaged, posing no increased risk of cancer or congenital defects to their children. And new... view more... (2002-09-03)
New research challenges advice that men should abstain from sex before fertility treatment
Madrid, Spain: New research by Israeli fertility experts has challenged current medical opinion, which holds that refraining from sex for up to a week at least is beneficial for men prior to undergoing some types of fertility treatment. Doctors and scientists from Soroka University and Ben-Gurion University of the Negev, Beer-Sheva, tested over... view more... (2003-06-27)
Sperm proteome gives "tantalising glimpse" towards the origin of sex
The first ever catalogue of the different types of proteins found in sperm could help reveal the origins of sex and explain some of the mysteries of infertility, say scientists. view more (2006-11-13)
|
|
| Page
1 of
11 |
211 Results |
|
|
|
Sort By:
Page Views | Date |
|
|
