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Tag: "legs" at biology news

How ancient whales lost their legs, got sleek and conquered the oceans

...lly parted company with the last remnants of their legs about 35 million years ago, a relatively sudden genetic event may have crowned an eons-long shrinking process. An international group of scientists led by Hans Thewissen, Ph.D., a professor of anatomy at Northeastern Ohio Universities College of Med...

NASA technology helping injured US troops

...es like ours are bedridden and have not used their legs for quite some time. Their legs cannot support their body weight." Using SAM reduces the pressure on the legs, and allows them a cha...

UF scientists discover evolutionary origin of fins, limbs

...eft feet. We have genes that instruct our arms and legs to grow in the right places and point in the right...e body where the fins that preceded human arms and legs sprouted, but at the midline that runs along the backbone and belly. This midline -- think of the...

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

...sease of the blood vessels to the heart, brain, or legs have had IFG or IGT on previous testing. ...

Parachuting allows krill to eat and run

...icularly rapid as the krill fan out their swimming legs and enter a controlled descent, akin to parachuting. The behavior is most apparent when their stomachs are full and may be an effective means of getting out of harm's way when they can eat no more. It is estimated that Antarctic krill sequester 0.02 ...

Exotic crab poised for widespread UK invasion

...mature crab is the size of a dinner plate when its legs are extended (the body is around 8cm wide and the legs about 12cm long) The scientific name is Eriocheir sinensis (from the Greek meaning wool hand of...

First demonstration of 'teaching' in non-human animals

...the follower has done this does it tap on the hind legs and abdomen of the leader to let it know that the tandem run can proceed. The researchers' detailed analysis of the movements of tandem leaders and tandem followers shows the mutual feedback between them: if the gap between them gets too large, the...

Penguins waddle but they don't fall down, UH researchers say

...adjusting for the limitations of the size of their legs and their weight. Humans, on the other hand, have not developed such a mechanism to adjust for such dramatic side-to-side motion. So, if we simply waddle, chances are we'll fall, but some aspects of a penguin's wobble could be very beneficial. "W...

How does the brain know what the right hand is doing?

...out looking at them. You don't have to watch your legs and feet when you walk. Your brain knows where they are. For decades scientists have debated two options for how the brain achieves this: (1) the outflow hypothesis says that the brain monitors signals it sends to the muscles telling them how strong...

Genetic key to growth of new arteries is identified

...animal or a person to grow new arteries when their legs don't get good blood flow. Legs are a big problem,..., and in about three weeks the blood flow in their legs was close to normal. The mice without the MMP2 gene did not grow new arteries. About 40 percent lo...

MicroRNA may have fail-safe role in limb development

...rand of molecules plays a role in how our arms and legs develop and grow - a finding that sheds light on perplexing bits of material once dismissed as genetic "junk," say scientists at the University of Florida and Harvard University. The research, available today in the online edition of Nature, may hel...

Ancient trans-Atlantic swarm brought locusts to the New World

... Using muscle samples taken from the powerful hind legs of locusts, Lovejoy and his colleagues used mitochondrial DNA sequences to reconstruct the evolutionary history of the Schistocerca locusts. The team found that the desert locust lineage gave rise to the more than 50 Schistocerca species found in the...

Fruit fly research set to revolutionize study of birth defects

...air and bulging eyes and the fruit flies have bent legs (and wings), tufts of bristles and rough eyes." While identifying this gene array is significant in its own right, the successful use of fruit flies in this kind of study is a revelation to the researchers who view it as an efficient model for the...

Wright bros. upstaged! Dinos invented biplanes

...ight feathers and appear adapted to streamline the legs during catching and carrying prey so they don't in...ckward motion. "The problem we faced is that the legs of Microraptor, like on any dinosaur, could not be splayed sideways," as the Chinese paleontologists...

MWG Biotech expands siMAX?siRNA portfolio with new scales, lengths and design tools

...d pops out of the front end of the animal, and its legs and wings elongate," Thummel says. "Now it is a true pupa, which is an immature adult. It essentially is an adult," except its organs continue to form as it spends another 3.5 days inside its pupal case, which is like a cocoon but made of hard cuticl...

Scientists find a maturity gene in fly

...d pops out of the front end of the animal, and its legs and wings elongate," Thummel says. "Now it is a true pupa, which is an immature adult. It essentially is an adult," except its organs continue to form as it spends another 3.5 days inside its pupal case, which is like a cocoon but made of hard cuticl...

Taking a flying jump

...a "take-off" sequence, involving stretching of the legs and depression of the wings that can move the fly in a specific direction. Previous studies did not detect directional jumping1, but observations were made in conjunction with non-directional stimuli such as switching lights on and off. Card's resul...

Ants win a waxy race

...ting in Barcelona [session A 7.68 and A7.70]. The legs of the specialist ant Crematogaster contains two claws and an adhesive pad. Bruening performed experiments with ants running along glass and wax rod, clipping off their claws or pads to assess the essence of these components. She observed that, as it...

Gap-climbing fruit flies reveal components of goal-driven behaviors

...e formation of a "bridge" with the hind and middle legs still holding on to the starting side and the front legs just about reaching the edge of the target side. Forward shifting of the body into the gap, primaril...

Spider blood found in 20 million year old fossil

...avelling in. It also reveals which of the spider's legs broke first. David discovered the fossil in 2003 during a visit to the Museo del Ambar Dominicano in Puerto Plata, Dominican Republic. His research initially focused on the spider which he identified as an entirely new species of spider. On his retu...

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