Tag: "fitness" at biology news

Purdue Study Finds Prehistoric Couch Potato

...lagging behind their northern relatives in aerobic fitness for tens of millions of years. "Whereas 140 million year ago, the Argentine dinosaurs breathed only slightly more efficiently than their more primitive ancestors, the North American dinosaurs of the same age had vastly improved their technique," he s...

Birds Sing The 'Story Of Their Lives,' Theorize Duke Biologists

...wy tail or an elaborate song, showed their genetic fitness becausethey could survive despite the attention-attracting handicap. However, such theories did not satisfactorily explain the precisemechanism by which bird song functioned as an information source. So, Nowickiand his colleagues began to de...

DFG To Set Up 14 New Collaborative Research Centres

...ing laws and regularities underlying theecological fitness of crop plants. Cells have specific receptors enabling them to respond to external stimuli such as hormones,growth factors or other messenger substances. These receptors are membrane proteins whichin the cell trigger a cascade of processes whose last...

Ecological Consequences Of Jasmonate-Induced Responses For Plants In Native Populations

... defenses are beneficial and increase a plant's fitness when it is under attack, but they are costly wh...or reproduction, or by other means decrease the fitness of well-defended plants when grown in competition with less-defended plants in environments lacki...

For Fruit Flies, Finding The Right Mate May Mean Offspring With A Longer Life Span, According To New Study

... and male competition. "We know there are fitness consequences to sexual selection, but paststudies ...erception.Second, very little is known about adult fitness components and how femalesselect mates to pass them on to offspring. And finally, many previous stud...

Greater Prairie Chicken Appears On Comeback Trail In Illinois

...w genetic material by these outside birdsbolstered fitness back to original levels," Paige said. Greater prairie chickens once occupied the prairies from Canada to Texas. Theyare considered virtually extinct in Canada; their southern cousin, the Attwaterprairie chicken, is endangered on the Texas coastal pr...

Medical Tip Sheet B

...e cerebellumplays in our habits, and maintaining a fitness program. Dr. Gilewski offers 7tips for developing -- and sticking with -- a successful fitness program. HOUSEWIDE PAIN MANAGEMENT INITIATIVE IS DESIGNED TO EFFECT FASTER HEALING BYREDUCING PAIN ...

News Tips Wednesday, March 24, 1999

...at the University of Alabamaat Birmingham examined fitness levels and body weight in over 4,100 men andwomen, 18 to 30 years. Fitness level was determined by "maximum treadmill time(TRT)," the amount of time each individual spent on a treadmill. At aseven-year follow-up, the researchers compared beginning ...

When is a pollinator not a pollinator? Tales from an insect crime scene...

...s. "The most probable explanation for the reduced fitness of nectar-robbed scarletgilia is that these plants attract less pollinators," says Irwin. "Hummingbirdstend to avoid plants which are highly robbed, and visit less flowers on thoseplants. Our study shows that nectar-robbing does decrease reproductiv...

Duke study: Exercise may be just as effective as medication for treating major depression

...tudies have shown that improved levels of physical fitness arerelated to improved symptoms of depression, he said. Nevertheless, early nextyear, Blumenthal plans to begin a new study to gauge the effect of exercising ina less-supportive atmosphere, and he also plans to include a placebo group.Blumenthal sug...

Transgenic fish could threaten wild populations

...any history ofselection that could reduce negative fitness effects. However, these arguments ignore the poten...vantageous effects of transgenes on some aspect of fitness such as mating success. Here, we examinethe risk to a natural population after release of a few tran...

Study finds elderly women can halt bone loss

...ostmenopausal women who participate in a long-term fitness regimen that includes jumping and "resistance" exercises using weighted vests can prevent significant bone loss in the hip. In some cases, the researchers say, the bone density of elderly women who participated in the OSU study actually increased....

A more accurate measure of exercise ability in older people reported by San Francisco VA Medical Center researchers

...liable way to measure physical and cardiopulmonary fitness in elderly people. The researchers say the test r...the treadmill, and also should serve as a reliable fitness measure for heart disease and kidney failure patients. The conventional treadmill exercise test, ...

Women with low body iron find exercise harder

...erate iron deficiency might not be getting all the fitness benefits of exercise training. They can improve aerobically but not optimally. Exercise for them is more difficult than for women with adequate iron." Women who are physically active, dieting or vegetarians are particularly at high risk for iron de...

Taking the long view: examining factors which influence Northern Spotted Owls

... their reproductive output recorded, and relative fitness estimated. The study area, which is centered around Trinity River east of Eureka, is located upon land managed by the US Forest Service and the Bureau of Land Management. The area is considered to be one of the most complex and diverse in the ...

Two bees or not two bees? Researchers take first look at the genetic differences between queen and worker honeybees

...ueen and larvae to develop quickly and gain direct fitness as heads of the colony, says Evans. Developing queens that emerge first, even if only by a matter of hours, almost always beat rival queens in gaining control of colony reproduction. Such polyphenic studies are useful because they reflect the effec...

New research confirms that natural selection is acting on the current human population

...oduce earlier in their lives have higher Darwinian fitness (2). They show that this trend is being passed on ...traits was found to be genetically associated with fitness - the ability of an organism to reproduce itself because it is well adapted to its environment. Out...

Proteins in African HIV strains interact differently with drugs

...measured the proteases' efficiency and biochemical fitness through factors related to catalysis, a chemical term for a process where one substance (the protease) accelerates a chemical reaction in another substance (the substrate) without being changed itself. The catalytic action of the protease is vital i...

Physically fit, leaner older people are happier, study says

...e healthy. Researchers assessed the participants' fitness levels during treadmill testing, recorded their mu...urage all older people to increase their levels of fitness and maintain a healthy body weight not only for their physical health but also for their mental well...

Resistance training complements aerobic exercise for women

... Binzen says. "We studied regular women, not super fitness enthusiasts," she adds, "so these results may apply to most moderately active women. Sedentary people would see even a greater benefit at first, but they should always check with their physician before starting an exercise program."...

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