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Tag: "frogs" at biology news

Caribbean frogs started with a single, ancient voyage on a raft from South America

... species on Caribbean islands, including the coqui frogs of Puerto Rico, originated from a single frog spec...surprising because no previous theories of how the frogs arrived had predicted a single origin for Caribbean terrestrial frogs and because groups of close re...

Bones in motion: Brown scientists to create new 3-D X-ray system

...ojects to visualize pigs walking, birds flying and frogs jumping, using seed funds from Brown's Office of the Vice President for Research and the National Science Foundation. Software will be rolled out in phases, Brainerd said, with a complete system available by 2010. The project builds on orthopedic ...

Natural antibiotics yield secrets to atom-level imaging technique

...produced by virtually all animals, from insects to frogs to humans. AMPs are the immune system's early line of defense, battling microbes at the first places they try to penetrate: skin, mucous membranes and other surfaces. They're copiously produced in injured or infected frog skin, for instance, and the ...

Salamanders suffer delayed effects of common herbicide

....1 parts per billion have been shown to cause male frogs to develop both male and female organs by altering their production of sex hormones. Findings from Rohr's study, which was funded by the U.S Environmental Protection Agency, National Science Foundation, and the Kentucky Academy of Sciences, could ...

The subtleties of tropical forest demise

...sts burn or trees come crashing down, but not when frogs disappear or plants stop reproducing because their critical pollinators have vanished," said Laurance. The 23 chapters in the book span much of the tropical world, including South America, Africa, Southeast Asia, Australia, and Oceania. In ...

What animals can tell us about hemorrhage, organ transplants and aging

...anic flights They slog through wetlands, studying frogs that literally freeze during the winter, then hop away in the spring as though nothing unusual occurred Comparative physiologists study all kinds of animals -- bears, frogs, snakes, squirrels, seals, oysters and a host of other animals to answer ...

Mobile DNA part of evolution's toolbox

...t in every species for which we have genomes, from frogs to humans," says Bejerano. Comparing the sequence to other species also turned up a big surprise. When the researchers compared the human ultraconserved element to all the DNA sequences in the public database GenBank, the closest match was to DNA f...

Race to halt global amphibian crisis boosted by rediscovery of endangered Colombian frogs

...tists recently found the two Critically Endangered frogs ?the Santa Marta harlequin frog (Atelopus laetissi...ra Nevada mountains, and scientists will study the frogs to learn how they have avoided it. "It's a race against time to prevent chytridiomycosis from wipin...

Where have all the butterflies gone?

... butterflies to similar declines in populations of frogs and other amphibians. While there may be different possible explanations for declines at each location, "the pattern is regional," he said. Shapiro is working to test various ideas about why these butterflies are in decline, including combinations of...

Leptin found to control appetite and limb development in frogs

...at the University of Michigan. Denver's team gave frogs a dose of leptin at various stages of development ...one. Rather than going off their feed as the older frogs did, these tadpoles kept right on eating and quickly sprouted limbs. Denver, who has studied the a...

Study shows frogs can play key role in stem cell research

...cells, crucial for the correct development of both frogs and humans." ...

Anemone genes reveal versatile building blocks for body plans

...teral body axes in animals as diverse as flies and frogs have been found to play an unexpected role in patterning an animal with a different body plan--a simple sea anemone. Sea anemones, along with corals and jellyfish, are members of the phylum Cnidaria, and they possess a radial body plan that is dist...

Poison dart frog mimics gain when birds learn to stay away

... more toxic frog, they generalized." The harmless frogs can look like the less toxic poison frogs without losing any protection from predators. The result is surprising, because mimicry theory pred...

Scientists discover dozens of new species in 'Lost World' of western New Guinea

...ost six inches across ?along with more than 20 new frogs and four new butterflies. Local Kwerba and Papasena people, customary landowners of the forest, welcomed the Conservation International team and served as guides and naturalists on the expedition into the vast jungle tract. These people told the tea...

Lizard 'third eye' sheds light on evolution of color vision

...n lower animals and ours. It turns out that some frogs and fish also have a spot on their foreheads that might play the role of a light-sensing third eye. Yau hopes to pursue these structures to obtain more clues about how our photoreceptor cells, the rods and cones, came about. As he says, he's most cur...

Climate change drives widespread amphibian extinctions

...At least 110 species of brightly colored harlequin frogs once lived near streams in the tropics of Central ...ratures, Pounds and colleagues show that harlequin frogs are disappearing in near lockstep with changing climate. According to the scientists, the Earth's ri...

Extinctions linked to climate change

...n turn, led to widespread extinctions of harlequin frogs at middle elevations of mountainous regions. In a commentary article in that same publication, an OSU scientist who pioneered the study of global amphibian decline said this is another key example of unanticipated and complex impacts from climate ch...

Rare Chinese frogs communicate by means of ultrasonic sound

...ow scientists say that these concave-eared torrent frogs also hear and respond to the sounds. The findings...ey of amphibians in China. Feng continues to study frogs and bats to understand how the brain processes sound patterns, especially in sound-cluttered environ...

Forsyth scientists gain greater understanding of how embryos differentiate left from right

...velopmental event happens earlier than expected in frogs by identifying an ion transporter that generates natural bioelectrical signals that ultimately control gene expression and the position of the heart and visceral organs," Levin said. "We have now identified and explored an additional component of thi...

Lactic acid not athlete's poison, but an energy source - if you know how to use it

...uels in the body's tissues. Experiments with dead frogs in the 1920s seemed to show that lactate build-up eventually causes muscles to stop working. But Brooks in the 1980s and '90s showed that in living, breathing animals, the lactate moves out of muscle cells into the blood and travels to various organs...

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