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Tag: "hungry" at biology news

Experiments provide proof of how traveling in groups protects insects

...etimes unite with their own kind and form teeming, hungry islands of life that devour everything in their path that's edible. Some spectacular marching packs stretch several miles wide and extend 10 miles or so in length. And they can travel a mile or so a day. Why such groups of insects form has mystified...

Experiments provide proof of how traveling in groups protects insects

...etimes unite with their own kind and form teeming, hungry islands of life that devour everything in their path that's edible. Some spectacular marching packs stretch several miles wide and extend 10 miles or so in length. And they can travel a mile or so a day. Why such groups of insects form has mystified...

The circadian clock: Understanding nature's timepiece

...encil eraser tells you when to wake up, when to be hungry and when it's time to go to sleep. The same cells also cause you to be disoriented after you've flown across multiple time zones. The human circadian clock, comprised of about 20,000 time-keeping cells, has mystified scientists since it was pinpoint...

A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs

...prompt the embryos to hatch early when shaken by a hungry reptile but not when buffeted by another outside force such as rain, is a question that has now been answered in part by Boston University researcher Karen Warkentin. According to her findings, reported in an upcoming issue of Animal Behaviour, it's ...

'Sinkers' provide missing piece in deep-sea puzzle

...urce that was more than adequate to feed all those hungry deep-sea animals. These findings may seem esoteric, but they have global implications. The inability to account for all the carbon reaching the seafloor has been a major concern not only to oceanographers but also to some climate modelers who are tr...

Mosquitoes are more attracted to individuals infected with malaria

...esearchers measured which child most attracted the hungry bugs. Koella et al. found that individuals attracted significantly more mosquitoes if they had the infectious stage of the malaria parasite. Moreover, when the children were treated with antimalarial drugs, there was no difference in the subsequent a...

Hunger in America rises by 43 percent over last five years

...than 7 million people have joined the ranks of the hungry since 1999. The USDA report, Household Food Security in the United States, 2004, says that 38.2 million Americans live in households that suffer directly from hunger and food insecurity, including nearly 14 million children. That figure is up from...

An essential regulator of body weight revealed

...s of rats. High levels of NPY in the brain of both hungry and obese mice provided further evidence that NPY was likely to stimulate feeding. Ten years ago, Palmiter's lab created mice that lacked the NPY protein, expecting that they would eat less than normal mice. "We thought they might chronically eat l...

How Fruitflies Know It's Time for Lunch

...tem prioritizes internal and external signals. How hungry must flies be to overcome taste aversion? How do the competing neural networks of taste and hunger signals decide whether the fly will eat? Future studies pairing behavioral and genetic analysis may begin to reveal answers to these open questions. ...

Study finds that nutritionally enhanced rice reduces iron deficiency

...o have difficulty making it into the mouths of the hungry and so malnutrition persists. "The fact that biofortified foods can have an impact on nutritional status in humans is an enormously exciting breakthrough," Zeigler noted. "It is time to shift the agricultural research agenda, and the rice research a...

World's pledge to halve hunger by 2015 looks like empty promise

...ess proceeds as usual, just as many people will be hungry in the world -- 800 million -- in 2015 as there we...oping countries since 1990. In fact, the number of hungry people in sub-Saharan Africa has jumped 20 percent since then, says Pinstrup-Andersen, who also chai...

Snakes' virtual glasses, leopard spots and all-optical transistors

...uilt in the past have been far too large and power hungry to be practical. Physicists at the Queen's University in Belfast appear to have solved the problems with a prototype optical amplifier that is both small and low power. The key to the device is a layer of gold film pierced by an array of holes 0.2 mi...

Eat less, weigh more? Enzyme makes lean mice 'susceptible' to dietary fat

...ination of food intake and energy expenditure, how hungry the body is, and how much energy cells need. Many cells in the body use a sugar called glucose as a source of energy. When the body is starved, the body literally feeds on itself, breaking down fat to form fatty acids that fuel energy needs. When ...

New mechanism explains glucose effect on wakefulness

...chanisms is the neural machinery that triggers the hungry brain to the alertness needed for seeking food. That same machinery swings the other way after a hearty meal, as exemplified by the long and honored custom of the siesta. However, scientists have understood little about how the basic energy molecule,...

Tracking sperm whales and jumbo squid

... A stressed-out squid may be an easy target for hungry sperm whales waiting below, according to Gilly. "We propose that jumbo squid are more susceptible to predation while they are recovering at depth immediately after a deep nighttime dive," he explained. In previous studies, Gilly found that jumbo s...

Scientists seek useful traits in wild cottons

...ide a three-week window of protection against this hungry pest, Arnold said. Arnold raises thrips on wheat, a favorite host plant, and forces them to move to neighboring cotton plants by killing the wheat with herbicide. "This produces massive thrips pressure on the cotton plants, and result...

Moths mimic sounds to survive

In a night sky filled with hungry bats, good-tasting moths increase their chances of survival by mimicking the sounds of their bad-tasting cousins, according to a new Wake Forest University study. Published in the May 29 issue of the Proceedings of the National Academy of Sciences, ...

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