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Tag: "reproductive" at biology news

Exotic crab poised for widespread UK invasion

... restaurants and is eaten raw, preferably with its reproductive organs swollen! If you see a crab in freshwater it is almost certain to be a mitten crab (only one other small non-native crab has been reported from Cardiff Docks) Politician Peter Mandelson was once jokingly likened to a mitten crab by Deput...

How sperm crack the whip

... arrival in the alkaline environment of the female reproductive tract triggers its tail's whiplike motion, called hyperactivation. In 2001, the researchers showed that a protein called CatSper1, found only in the sperm tail, was required for male fertility. Subsequently, with colleagues at the University of Wash...

Males with elevated levels of testosterone lead shorter lives but have more success siring offspring

...e to fitness, that is, the combination of lifetime reproductive success and survival, in the wild or experimentall...erred to mate with older males and realized higher reproductive success when they did so. While young males treated with testosterone increased their ability to att...

Face perception is modulated by sexual orientation

...frontal cortex play a role in evaluating potential reproductive partners? Facial beauty is considered a marker for reproductive fitness. Not surprisingly, recent studies have reported that facial beauty evokes activation in the ...

For the first time: Longevity modulated without disrupting life-sustaining function

...ay would be elusive, whereas the developmental and reproductive functions would be more amenable. We were delighted to find that Smk-1 proved to be specific for the one function we thought the most elusive," he added. Some of Dillin's earlier research had hinted at the possibility that "specificity" factors may ...

Uncovering sex-change secrets of black sea bass

... before reaching adulthood, devoting energy toward reproductive development and away from growth. Such problems make breeding and growing the fish in captivity a tricky proposition. "Black sea bass is a wonderful fish to culture and to eat," says George Nardi, vice president and director of GreatBay Aquaculture...

New licensing agreement to maximize AIDS drug development

...cooperating agency of USAID committed to improving reproductive health by expanding the contraceptive choices of women and men and by helping to prevent the transmission of HIV/AIDS and other sexually transmitted diseases. CONRAD is administered through the Department of Obstetrics and Gynecology at Eastern Virg...

ASU researchers find link between social behavior, maternal traits in bees

...hinks part of the answer can be traced back to bee reproductive traits. A paper describing Amdam's experiments, "Complex social behavior derived from maternal reproductive traits," is the cover story of the current issue (Jan. 5, 2006) of Nature. Additional authors includ...

Contaminants linked to sturgeon decline in Columbia river

...s," Feist added, "and exhibited reduced growth and reproductive fitness when compared to fish sampled in other locations. These data suggest that some contaminants may be accumulating behind dams over time." North America's largest freshwater fish, white sturgeon can grow to 20 feet in length, weigh more than 1,...

UCR researchers design chip that can improve citrus varieties

... disease control, nutritional characteristics, and reproductive development. "The citrus array helps us quickly examine a certain trait in citrus," said Mikeal Roose , a professor of genetics in the Department of Botany and Plant Sciences at UCR and a leader of the three-year research project. "For a trait posi...

'Scent of a woman' tells male redback spiders to find a mate

...males have to mate with a virgin to maximize their reproductive success. "On the one hand, they want to provision themselves to survive this trip," says Andrade. "On the other hand, they have to develop quickly so that they become sexually mature in time to mate with these virgin females before the females mate ...

Albatross study shows regional differences in ocean contamination

...iated with a variety of adverse effects, including reproductive deformities, endocrine disruption, and immune system dysfunction. "It is very difficult to show a cause-and-effect link in a wild population, but there is evidence of health impacts in other species at these contaminant levels," Finkelstein said. ...

Vegetables inhibit growth of prostate cancer in mice with human tumors

...iated with a variety of adverse effects, including reproductive deformities, endocrine disruption, and immune system dysfunction. "It is very difficult to show a cause-and-effect link in a wild population, but there is evidence of health impacts in other species at these contaminant levels," Finkelstein said. ...

One-third of adults with diabetes still don't know they have it

...rome, a metabolic disorder that affects the female reproductive system have acanthosis nigricans (dark, thickened skin around neck or armpits) have a history of disease of the blood vessels to the heart, brain, or legs have had IFG or IGT on previous testing. ...

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

...veloped to treat a number of conditions, including reproductive disorders, cancer, diabetes, cardiovascular disease and high cholesterol. But how receptors work together to impact physiology has been largely unknown. To find out, researchers from UT Southwestern and the Salk Institute in California collaborated...

Mass. General study finds potential ovarian cancer stem cells

...as been studied for its potential to treat several reproductive tumors by Patricia Donahoe, MD, director of the MGH Pediatric Surgical Research Laboratories and senior author of the PNAS study, and David MacLaughlin, PhD, associate director of the labs and a study co-author. "We feel that non-traditional, pos...

How IVF could be causing genetic errors in embryos

...vioural abnormalities are associated with assisted reproductive techniques. Cases of Angelman and Beckwith Wiedeman syndromes in humans, which are due to aberrant genomic imprinting, and other abnormalities in growth and development in mice have been described after culture in vitro," said Professor Rinaudo. Ang...

NHGRI announces latest sequencing targets

...rug development, neuroscience, behavioral biology, reproductive physiology, endocrinology and cardiovascular studies. In addition, because it can be infected with simian immunodeficiency virus, a close cousin to the human immunodeficiency virus (HIV), the rhesus is widely recognized as the best animal model for r...

Study finds that a woman's chances of having twins can be modified by diet

... significantly since 1975, about the time assisted reproductive technologies (ART) were introduced. The intentional delay of childbearing has also contributed to the increase of multiple-birth pregnancies, since older women are more likely to have twins even without ART. "The continuing increase in the twinning...

Study links high levels of nitric oxide to infertility and sperm DNA damage

...le in regulating the biology and physiology of the reproductive system, and we know that it can affect human sperm functions, such as motility, viability and metabolism. At low concentrations it can have a positive effect on cells, but a negative effect at high concentrations. "In our study we discovered that th...

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