sex 2 4

Tag: "sex" at biology news

Researchers now able to look deep into heart to view triggers of a heart's beat

...ts, bees, and wasps--have an unusual mechanism for sex determination: Unfertilized eggs develop into males, while fertilized eggs become females. But the development of an unfertilized egg into an adult (called parthenogenesis) remains a mysterious process. One mystery has been the origin of the centro...

Access to antiretrovirals unlikely to reduce HIV infection rates

...and counseling (which will hopefully increase safe sex practices). They found that providing ART to all...g patients and the rest of society to promote safe sex practices must therefore be an essential part of any strategy if it is to contain and reverse the AI...

FSU biologist says new dinosaur is oldest cousin of Tyrannosaurus rex

... monster of "Jurassic Park" movie fame. While the sex of the two T. rex cousins was impossible to ascertain, Erickson determined their respective ages by examining the growth rings on the inside of their bones. Those of the larger animal had seven closely spaced rings –?revealing rapid growth to young a...

Sex: It's costly but worth it. Just ask a microbe

...ssor of biology at McMaster University, found that sex exacts physical, morphological and behavioural str... own." The irony is that despite the high cost of sex there are benefits. "In many microbes, mating and sexual reproduction produce genetically diverse ...

Uncovering sex-change secrets of black sea bass

...s, for one problem: they have a tendency to change sex unpredictably in captivity. "In the wild, black ..., a commercial fish farm in Newington, NH. But the sex change problem must be tackled if fish farmers are to bring a high-quality fish to market. "We inves...

Epstein-Barr virus may be associated with multiple sclerosis

...without MS were matched to each MS patient by age, sex and date of blood collection. The blood samples of all participants were then analyzed to determine the levels of antibodies against the Epstein-Barr virus. Measuring antibodies, proteins produced by the body to fight infection, is one way to determ...

Big hips, big belly? It's in your genes, Joslin-led study shows

...without MS were matched to each MS patient by age, sex and date of blood collection. The blood samples of all participants were then analyzed to determine the levels of antibodies against the Epstein-Barr virus. Measuring antibodies, proteins produced by the body to fight infection, is one way to determ...

Sex chromosome genes influence aggression andmaternal behavior, say UVa researchers

...ty of Virginia Health System. "The differences in sex chromosomes, XX versus XY, are also responsible fo...ining gene Sry on the male Y chromosome from other sex chromosome genes. The presence of Sry leads to the development of the testes and high levels of andr...

Contaminants linked to sturgeon decline in Columbia river

...igh amounts of toxic contaminants in their livers, sex organs and muscle tissue. "We don't know the exact source of contamination," Schreck said. "The fish move, the stuff they eat moves and the water and sediments bearing the contaminants moves. The Columbia receives input from numerous sources, so an...

HIV decline in Zimbabwe linked to behavioural change

... attribute to people delaying when they first have sex and having fewer casual partners. They found HIV prevalence fell most steeply at young ages, with a drop in prevalence of 49 percent for women aged between 15 and 24, and a 23 percent drop in men aged 17 to 29. In 2003 Zimbabwe was estimated to ha...

Teens unaware of sexually transmitted diseases until they catch one, Carnegie Mellon study finds

... girls, found that those who viewed an interactive sex education DVD created by Carnegie Mellon researchers were more likely to become abstinent than girls who did not see the DVD. This latest study was co-authored by Wandi Bruine de Bruin and Baruch Fischhoff of the Department of Social and Decision Sci...

Knowledge of infection may prevent spread of herpes virus

...tting the virus and disclosing their HSV status to sex partners. ...

Trial success for diabetic nerve therapy

...cur in other organs, including the heart, kidneys, sex organs, eyes and digestive tract. "Diabetic neuropathy is a major problem in insulin-dependent diabetes, particularly in patients who have had the disease for a period of time," said Professor Tomlinson, who is based in the University's Faculty of L...

What's shaped like a pear and has 2 genomes? Check the pond

...nucleus, the "micronuclear" genome is reserved for sex and reproduction, remaining genetically silent during growth. Inside the second, working nucleus is the "macronuclear" genome, which expresses genes that govern behavior. The current study sequenced the macronuclear genome, an impressively package...

New HIV study identifies high-risk subgroups of adolescents

...disease (those who engaged in the most unprotected sex acts) were mostly white males with mental health p...ged: the cluster with the highest amount of unsafe sex reported only moderate substance abuse and low numbers of mental health issues, whereas the group of...

First 'encyclopedia' of nuclear receptors reveals organisms' focus on sex, food

...oduction and metabolism. So it really is all about sex and food. "The power of this analysis is highlighting such receptor associations that may predict functions heretofore unknown. This really is pointing to new directions in biology." Much already is known about individual nuclear receptors, which...

High estrogen levels associated with dementia in older men

... risk factors and some studies have suggested that sex hormones play a role. One large study showed that ...contradictory. To better understand the role of sex hormones in dementia, researchers led by Mirjam Geerlings, Ph.D. of the University Medical Center Ut...

Genetic tug of war determines sexual differentiation

...p incomplete testes. This suggests that vertebrate sex determination results from the interplay between t...er to better understand the role of temperature on sex determination in a turtle that she hopes can shed light on the general issue of sex determination in...

Nutrition a major factor in rise in twin pregnancies

...irth statistics from 1920 to 2003 to determine the sex of babies at birth among multiple pregnancies. Th...e involved and half the twins will be of different sex - was relatively constant from 1920 until the 1960s, but there was then the well-known dramatic incr...

Chromosomal abnormalities in sperm higher after vasectomy reversal

...f chromosomes ?unlike most cells in the body, the sex cells should only contain one set of chromosomes. ...me interval after vasectomy reversal and the total sex chromosome aneuploidy rate ?i.e. the long ago the reversal the better the chances of producing norma...

1 2 3 4 5 6 7