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Tag: "sex" at biology news

Viral hitchhiker inhibits Wolbachia bacteria's ability to proliferate

...cking them to bear more infected females, the only sex that transmits the bacteria. Now, a new study from the MBL (Marine Biological Laboratory), published in the May 18 issue of PLoS Pathogens, demonstrates that a virus common to Wolbachia cells may be a key inhibitor of the cellular process that allow...

UCLA study finds same genes act differently in males and females

...el, the only difference between the genders is the sex chromosomes," said Drake. "Out of the more than 30,000 genes that make up the human genome, the X and Y chromosomes account for less than 2 percent of the body's genes. But when we looked at the gene expression in these four tissues, more than half...

Evolutionary forces explain why women live longer than men

...Women live longer in almost every country, and the sex difference in lifespan has been recognized since at least the mid-18th century," said Daniel J. Kruger, a research scientist in the U-M School of Public Health and the Institute for Social Research. "It isn't a recent trend; it originates from our de...

Female birds boost up their eggs when hearing sexy song

...gbirds can alter the size of eggs and possibly the sex of their chicks according to how they perceive the...in the experiment there was no difference in brood sex ratio between the different songs played to the females, which suggests different levels of female c...

Vaccine shown effective against chancroid

...a relatively simple task, Elkins said. Commercial sex workers infected with chancroid form a "reservoir"...ins said. A vaccine strategy of vaccinating female sex workers against chancroid could shut down the cycle of infection, eliminating the disease of not onl...

Study challenges myth that sex late in pregnancy hastens birth

...n enrolled, 47, or 50.5 percent, reported they had sex during the final weeks of their pregnancies ?more than any other similar study has indicated. The participating women were those with low-risk single pregnancies enrolled at their doctor's office visit after the 37th week of pregnancy. At this and s...

Thermal imaging shatters arousal gender gap myth

...les for military operations. Previously, sex researchers have measured arousal with instruments that require genital contact and manipulation. Binik focused thermographic cameras on his subjects' genitals while they watched a montage of material from pornography to horror movies to The Best of ...

Embryo tests give parents the choice

...inics in the US are allowing couples to choose the sex of their child, a survey conducted by the Genetics... strike until late in life, if at all. Non-medical sex selection accounted for 9 per cent of PGD tests conducted in the US in 2005, while 28 per cent of th...

AIDS study challenges conventional treatment guidelines for HIV patients

...d study composed largely of Caucasian men who have sex with men. The investigators sought to estimate how much of the person-to-person variation in the rate of CD4 cell loss could be accounted for on the basis of each patient's initial viral load, in an attempt to reproduce more closely the situation ...

China's environmental challenges

...ight herons, and carp--all of which have exhibited sex organ malformations. Frontier's Finishing Lines columnist Katherine Ellison highlights Goldman Environmental Prize Award winner Yu Xiaogang, a Chinese watershed activist. She notes that the Chinese government realizes it must rely on the support of...

Embryonic selection of sex avoids conceiving blind children

...ue Country, to successfully carry out an embryonic sex selection in a woman who is a carrier of the disea...ty of being carriers. The embryonic selection of sex is the only recourse open in order to avoid male children suffering from the disease with the conseq...

A new male-specific gene in algae unveils an origin of male and female

...w oogamy arose from isogamy, a more simple form of sex in which very similar reproductive cells take on d...that P. starrii maleness evolved from the dominant sex (MT-) of its isogamous ancestor. This breakthrough in understanding provides an opportunity to addre...

Scientists discover role for dueling RNAs

...y thought to have no function, may in fact protect sex cells from self-destructing. These findings will b...ates sense RNA. This same process may occur in the sex cells of mammals. In fact, considering how widespread these antisense transcripts are, I wouldn't be...

New HIV statistics indicate increasing toll of AIDS on African American community

...mination against, black gay and other men who have sex with men (MSM). African-American MSM is the population hardest hit by HIV, with diagnosis rates twice that among white MSM. Yet currently there is only one HIV prevention program that has been specifically designed for black MSM. Investing in resea...

Did 'ABCs' cause Uganda's fall in HIV rates?

...sy, partly because of its focus on abstinence-only sex education programs over condom promotion, a focus ...tances drive them into transactional or commercial sex to pay for, among other things, schooling or gaining financial independence from family obligations....

Climate change creates dramatic decline in red-winged black bird population

...y hatch, so that shift has affected the population sex ratio." Over the years, Weatherhead's team has ...g season to see if that has changed, affecting the sex ratio as well." ...

Bad blood between boys and girls

...to suggest an effect of parasitic infection on the sex of a baby. Kankova and colleagues analysed the e... blood, previous deliveries and abortions, and the sex of the newborn. On average worldwide, for every three children born, only one is a boy. Kankov...

Why do insects like to eat some plants more than others?

...oductive allocation can attract enemies means that sex may be even more costly than previously though. This research also has implications for weed control and protection of rare plant species. ...

Malaria may fuel spread of HIV in sub-Saharan Africa

... of 10 times, it makes HIV more transmissible to a sex partner. Conversely, HIV may play a role in the geographic expansion of malaria in Africa because HIV-infected persons are more susceptible to malaria infections due to their already-compromised immune systems, according to study co-authored by Laith...

Designer babies - what would you do for a 'healthy' baby?

...tual characteristics as desirable depending on the sex of the child. Older women and childless women are significantly more willing to "improve" the physical, social and intellectual characteristics of prospective children? (This can be explained by women seeking to increase their genetic heredity, parti...

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(Date:12/3/2009)UPTON, NY A team of scientists from the U.S. Department of Energy,s (DOE) Brookhaven National Laboratory, Harvard University, and the Indian Institute of Science has made a major step in understandin
(Date:12/2/2009)PHILADELPHIA Children exposed to secondhand cigarette smoke have an increased risk of developing lung cancer in adulthood, even if they never smoked. , Results of this study are published in Cance
(Date:12/2/2009)PHILADELPHIA New study results strengthen the evidence that people who smoke cigarettes over a long period of time have an increased risk for developing colorectal cancer, even after adjusting for ot
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(Date:12/4/2009)Working with mice, scientists at Johns Hopkins publishing in the December issue of Neoplasia have shown that a protein made by a gene called "Twist" may be the proverbial red flag that can accuratel
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(Date:12/4/2009)Increasing exercise, water and fruit consumption leads to success, study finds , , FRIDAY, Dec. 4 (HealthDay News) -- Increased exercise, reduced soda consumption and self-weighing are among
(Date:12/4/2009)BOSTON, Dec. 4 Substantial progress has been made over the last 15 years in the healthcare community,s ability to diagnose and treat epilepsy and its complications. Yet this progress in epilepsy man
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