Tag: "tail" at biology news

Purdue veterinarian studies compulsive behavior in dogs

...disease often display compulsive behaviors such as tail chasing, snapping the air, licking excessively, chewing with an empty mouth and barking monotonously without any change in volume or intonation. Luescher has seen animals with severe stereotypical behaviors that affect their daily living. For example...

Study helps explain gene silencing in the developing embryo

...o lysine, one of the amino acids that comprise the tail region of histone molecules. Four core histone proteins are highly conserved in eukaryotic organisms, those having nucleated cells. These histones are involved in packaging our genetic information, DNA. Each contain a globular domain and an amino t...

When it comes to sperm competition, size can matterits the female who holds the aces

...st-copulatory, cellular equivalent of long peacock tail feathers." The researchers' conclusion was supported in a separate experiment in which evolving female sperm-storage organs were shown to drive the evolution of sperm length. "Now that we know about sperm-female co-evolution, it's important to askw...

New mammal species identified in Australia

...smaller ears, shorter feet, and a longer, brushier tail than those in Victorian forests to the south. Although there is variability in both populations, years of morphological data collected by Lindenmayer and colleagues confirm that these differences are statistically significant. Genetic distances ...

Sea squirt DNA sheds light on vertebrate evolution

...pole has a stiffened rod running the length of its tail called a notochord, the forerunner of our backbone, as well as a primitive nervous system. Ciona's close relationship to vertebrates, along with its compact genome -- about 160 million base pairs, one-twentieth the size of the human -- and small cell...

Fluid flow technology takes a cue from fast-swimming sharks

... along a shark's body from head to tail help the shark swim faster. But very fast-swimming sharks, such as the silky shark and blue shark, also have special arrangements of riblets, the function of which is a mystery. ...

An unlikely new weapon against a deadly bacteria in oysters: A virus

...taining concentrated amounts of the virus into the tail veins of mice infected with Vibrio. The result: The researchers found the phages cured the mice even well after they had begun experiencing symptoms of the disease. "It was very clear that the phage treatment for many of the mice could completely pr...

Cloned pigs behave like...pigs

...lso compared their weight, shoulder width, nose to tail length, growth rate and other physical characteristics. What Archer found was the cloned pigs behavior was just as variable as the control group of pigs in just about every way. They played, ate, slept, fought and responded to outside stimuli with th...

Human lymph disease could tail off thanks to gecko

...regenerate the lymphatic system at the site of its tail loss. This growth factor is similar to the VEGF protein found in the human body." Dr Cooter says the findings are encouraging for the treatment of lymphoedema in humans, but much more research is needed. "Discovering that geckos use a protein growth...

Female hormones found to protect against harmful effects of fructose

...minutes. All blood samples were collected from the tail vein. Blood Pressure Study #2 Four groups of female Wistar rats, 15 weeks of age, were used. Of this number, eight were in a control group, eight fructose-fed, eight ovariectomized, and eight ovariectomized and fructose-fed. The fructose fed group...

Multiple factors affect flight power curves among species

...es, magpies have broad, rounded wings and a longer tail that likely increases drag and prevents it from flying faster than 14 meters per second (31.36 mph) despite it having sufficient pectoralis power to fly at faster speeds. Instead, its wings are better suited for flight at lower speeds and likely all...

Cell density determines extent of damage caused by cigarette smoke exposure

...ollagen gels made from collagen extracted from rat tail tendons. Tendons were excised from rat tails, and the tendon sheath and other connective tissues were carefully removed. Type I collagen was extracted; protein concentration was determined by weighing a lyophilized aliquot from each lot of collagen s...

Sex and gender scientists explore a revolution in evolution

...s, that otherwise seemed maladaptive. The unwieldy tail on the male peacock, for instance, makes him more vulnerable to predators but more attractive to females. Many behaviors do not fit sexual selection theory, however. Says Vasey of his work with Japanese macaques: ''I see females competing for males a...

Dinosaur, crab fossils reveal ecosystem secrets

...well-preserved fossil of a crab within inches of a tail vertebra from a massive plant-eating dinosaur. Nec...edition for dinosaur bones. They found a dinosaur tail bone, fossil plants and the crab, all within a foot-and-a-half of each other. Because there have be...

New species of earliest-known salamanders found in China

... fossil that reveals the animals eye, folds in the tail and a stomach bulging with clams. This is very unusual, to get that kind of detail, Shubin said. The fossil also shows that the vertebral column and the limbs are not yet formed, and that the animals internal gills remain. Salamanders are living foss...

The structure behind the switch

...ing. The rest of the RNA strand hangs off like the tail of a kite; when the RNA reaches the end of the stretch of DNA to be transcribed, the entire RNA strand drops away from the DNA and leaves the nucleus. Not so in immunoglobulin production, says Yu. For one thing the part of the DNA that's transcribed ...

Whale study links genetics and reproductive success

...atches, dorsal fins and white markings beneath the tail flukes that can be viewed as the animal dives.The relationships between individuals--such as mothers and calves--have also been extensively documented over the same time period. The advent of molecular technology now enables researchers to examine h...

Scientists discover 'drive shaft' in mechanism that propels parasite into cells

... and Microbial Pathogenesis, went fishing with the tail of the MIC2 molecule. They wanted to find what that tail piece which projects through the cell membrane to the inside of the one-celled parasite would bind...

A new view of the crayfish brain

...ehavior associated with crayfish aggression is the tail flip. One type of tail flip indicates aggressiveness, while others signify subordination and the intention to escape. In t...

New owl species discovered in Brazil

...y." The tiny owl, measuring 6 inches from bill to tail and weighing a mere 2 ounces, was found in fragmen...h white spots; the back is dark reddish brown; the tail is dark brown with five horizontal white bands that appear as irregular white spots; the abdomen is ...

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