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Tag: "male" at biology news

A gene's first 'kiss' sets off that affair known as puberty

... for the physical changes and emotional baggage of male and female puberty, respectively. "We now have ve...hin 30 minutes of kisspeptin being administered to male monkeys, LH, one of the hormones stimulated by GnRH secretion, was no longer dormant, with levels 25...

Male circumcision reduces risk of HIV transmission from women to men

...enya collected detailed sexual data from agroup of male Kenyan truckers and, using statistical models, dev...exual partnerships are. Between1993 and 1997, 745 male employees of trucking companies based inMombasa, Kenya were followed for the study. Initially they w...

Elephants imitate truck noises, other animals

... model for her imitation. Calimero, a 23-year-old male African elephant who lived for 18 years with two female Asian elephants in a Swiss zoo, was a nearly perfect mimic for the chirp-like calls of his long-time zoo mates. The chirps are made by Asian elephants but not by African elephants. Calimero ofte...

Elephants imitate sounds as a form of social communication

... model for her imitation. Calimero, a 23-year-old male African elephant who lived for 18 years with two female Asian elephants in a Swiss zoo, was a nearly perfect mimic for the chirp-like calls of his long-time zoo mates. The chirps are made by Asian elephants but not by African elephants. Calimero ofte...

Development of portable infectious disease detector

...ysystem and used it as the basis for a inexpensive male fertilitydetector that can be used in the home to measure sperm motility with anaccuracy comparable to laboratory analyses."I'm thrilled at how well the VIIBRE and PRIA technologies mesh," saysJohn P. Wikswo, professor of biomedical engineering, phys...

Deficiency of growth hormone and IGF-1 reduces cancer and kidney disease, but creates other problems

...at had an effect on cancer: 88 percent of "normal" male rats have tumors at death. The male rats that had a lifelong deficiency of growth hormone had substantially fewer tumors ?63 percent ?an...

NYC's First Rapid HIV Drug-resistant AIDS Case Prompts Call to Step Up HIV Prevention

... and May 2003 -- had unprotected sex with numerous male partners in mid-October, reported feeling unwell in late October and November, and subsequently had positive ELISA and Western Blot (HIV tests) documented in mid-December. The individual then progressed to a diagnosis of highly drug-resistant AIDS by...

International trial of two microbicides begins

... women may not always be able to insist that their male partners use measures to prevent HIV transmission," notes NIAID Director Anthony S. Fauci, M.D. "If effective, microbicides would be a valuable woman-controlled means of slowing the pace of the HIV/AIDS epidemic," Dr. Fauci adds. The first volunteer...

MetaChip provides quick, efficient toxicity screening of potential drugs

... women may not always be able to insist that their male partners use measures to prevent HIV transmission," notes NIAID Director Anthony S. Fauci, M.D. "If effective, microbicides would be a valuable woman-controlled means of slowing the pace of the HIV/AIDS epidemic," Dr. Fauci adds. The first volunteer...

Bird Brains Show How Trial and Error May Contribute to Learning

The adult male zebra finch knows only one scratchy tune learned i...al neural activity of LMAN during the two types of male finch song, the performance-quality song directed at females, accompanied by some posturing and feat...

Photos show jaguar vamping for camera

He's beautiful and he knows it. A male jaguar recently acted like he was on a fashion runway in Manhattan, rather than his home in Kaa-Iya National Park in Bolivia, when it plopped down in front of a remote "camera trap" and allowed a remarkable 35 pictures to be taken over a five-and-a-h...

Vascular structure and function improve with diet and exercise

...ears. Researchers found that the 22 female and 16 male participants lost weight and improved their exercise capacity on the program. Treadmill tests were used to measure exercise capacity (VO2 max, the maximal volume of oxygen exchanged during exercise) at the beginning and end of the eight-week period. ...

How the environment could be damaging men's reproductive health

...osomes and that they could be contributing towards male reproductive disorders. A study by Swedish resear...tors are affecting the reproductive development of male foetuses. Babies born with undescended testes are at higher risk of developing testicular cancer be...

Cricket's finicky mating behavior boosts biodiversity

...enus detect tiny differences in the pulse rates of male courtship songs, which differ from one Laupala spe...uished by subtle differences in the pulse rates of male crickets' simple courtship songs, a secondary sexual trait that plays a large role in mate attractio...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...essence, there is not one human genome, but two -- male and female. "We looked at the X chromosomes of 40...ile females have a pair of X's. Many genes on the male Y chromosomes have been lost over evolutionary time, leaving the chromosome with fewer than 100 func...

Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment

...fied eggs would be warmed and then fertilized with male sperm. The fertilized eggs would then be transferr...inic also offers counseling and sperm freezing for male cancer patients. U-M will offer egg vitrification only to women facing cancer treatments, because th...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...rough binoculars, she and Eckert finally spot four male elephants on the horizon. The bulls head straight ...mmunication in planthoppers," she says. "I'd put a male planthopper on a stem and play back a female call, and the male would do the same thing the elephant...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...y twice the Mendelian prediction. Stranger still, male and female mice that inherit the t haplotype from both parents typically do not survive, but in the rare instances when they do, the overwhelming majority of males are sterile. Until now, most geneticists suspected that both transmission ratio disto...

Double triumph in stem cell quest

...ult donors? Verlinsky's response was that he fused male adult cells with a female ESC line, and the resulting cells were male. However, Verlinsky's team has not yet tested the HLA proteins on the cell surface to prove that the stembrids are an immune match for the adult donors. By contrast, Hwang's team h...

Grizzlies set to invade high Arctic?

...abs. The result: the genetic analysis pointed to a male barren ground grizzly bear, rather than a Viscount Melville polar bear, the variety known to inhabit the Melville Island area. During the past 15 years there have been more and more sightings for barren-ground grizzlies on the sea ice in the Arctic ...

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