Tag: "counting" at biology news

Dating A Caveman

...ously, even a mass spectrometer was not capable of counting the extremely small amount of U-234 and Th-230 found in samples like the Zhoukoudian material. But by upgrading and calibration of instruments pioneered by scientists at Caltech, Ku and his Caltech colleagues demonstrated in 1987 the feasibility of u...

Cornell Researchers Precisely Date Wood From Ancient Tomb In Turkey

...sample from a tree that you know grew to 1996. By counting 200 rings, you know that the tree is 200 years old and started growing in 1776. Then, you compare the pattern of its rings with those from a piece of wood from a building you know was built in 1860. You keep doing the same with earlier and earlier ...

Christmas Bird Count: Another Holiday Tradition

...easier for couch potato bird watchers, 30 years of counting is now available on the World Wide Web. Nearly 50,00 people each year volunteer their time on behalf of the National Audubon Society to record sightings of birds at Christmas time, providing the raw data for the best source of data on distri...

Bottom-up Ecological Processes Better For Clear Waters, Study Finds

...esearch literaturein the ecological sciences. Vote counting consists of tallying all studiesthat detect statistically significant effects and nonsignificant effectsand inferring the generality of the phenomenon, Brett explains. Vote countingis likely to find only large effects -- especially given the nature o...

Researchers Corral Millions Of Microscopic Membranes

... covering the wafer with blood, washing it off and counting the cells that remain stuck to different patches. Not only could this method identify and separate different kinds of cells like current methods, but it potentially could measure how well the cells are functioning, Groves suggested. In a similar fash...

Pollution, Food Stress Take Toll On Bald Eagles

...of DDT). He conducted aerial surveys byhelicopter, counting the number of incubating birds and the number of nestlingsproduced. And he watched eagle nests, from dawn to dusk, for a total of 850hours. He also filmed eagle family life. With the help of a professional treeclimber -- eagle nests are typic...

Ionotropic Glutamate Receptors Share Tetrameric Structure With The Voltage GatedPotassium Channel

A new counting method developed by researchers at the Salk Instit... receptors. This view is now challenged by a counting method developed by Christian Rosenmund, Yael Stern-Bach and Charles Stevens. ...

Monkeys Have Numerical Abilities, Two Columbia Psychologists Report

...eech. "Language isa complex social skill, whereas counting can be learned by the individual,"Prof. Terrace said. "Counting is useful in foraging for food, assessing a groupof predators or ordering the number of dominant males in one's group." With further studies, the research team hopes to answer o...

Counting X Chromosomes To Determine Sex

... lack a Ychromosome, so the choice must be made by counting X chromosomes instead, whichis not an easy task. Barbara Meyer, aHoward Hughes Medical Institute investigator, and her colleagues at theUniversity of California, Berkeley, have discovered a signal, which they callSEX-1, that helps the nematode wo...

Research Reveals Environmental Injustice In N.C. Communities With Large Hog Farms

...ock groups, areas of about 500 households used for counting U.S.residents. They excluded the state's five largest cities and western countieswith no intensive hog production. "Eight hundred and eleven operations were located in the 20 percent ofblock groups with the most poverty while only 43 operatio...

Male Moth's Sperm Protects Females

... can tell how many times a female mothhas mated by counting the tiny, hardened rings that are left behind when themale's spermatophores (or sperm packages) dissolve. After dissecting moths thathave died naturally, the biologists say the doughnut-like rings accumulate inthe sperm pouch and resemble a miniatur...

Researchers Discover How The Immune System Shuts Down Faulty T Cells

...ail of tumorantigens in their vaccines rather than counting on one or two. That should work,since researchers know tumor cells cannot downregulate all antigens. The study also helps explain observations that have long perplexedimmunologists trying to understand systemic autoimmune diseases such as lu...

Horseshoe crab studies providing new insight into valuable ancient creatures

...will lead the effort to measurespawning success by counting live eggs deposited in the sand by femalehorseshoe...onal volunteers are needed to assist biologists in counting horseshoecrabs during night-time high tides. Interested persons should contact Ms.Benjie Swan at 609...

Study shows cognitive decline is not normal in aging

...includedrecalling their date and country of birth, counting from 1 to 5 and thenbackwards again, naming specific body parts such as an arm or leg, identifyingan animal that had four legs, recognizing associations between similar objectsand activities, and following simple directions, such as folding a piece o...

Cincinnati chemists develop microsensors for nuclear waste cleanup, medical applications

...zepto-molar levels which is essentiallythe same as counting individualmolecules. There are two versions of the waveguide sensor using gold and indium tin oxideas electrodes. Thewaveguide itself is made from germanium-doped silica or from ion-exchangedglasses, and the UCresearchers were able to demonstrate fo...

Stream research supports better watershed management

...ts," Herricks said. "Fish are stunned, netted for counting andreleased. But this technique disturbs the position of the fish, and is only effective for largevolumes." The new, fixed-electrode technique allows the researchers to sample fish from very small andwell-defined aquatic habitat areas. By first ch...

International trade imperils U.S. plants, animals and crops

...orest pests, on the other hand, cost $2.1 billion, counting control costs and lost production. Fire ants alone accounted for a billion dollars last year in control costs and the loss of rangeland in the Southeast and Texas. Apart from economic damage, however, these invaders upset the ecosystem, preying on...

USGS seeks citzens of all ages to listen for frogs and toads

... few minutes cupping his hands around his ears and counting the frogs he sees and hears. Mr. Chamberlin is one of hundreds of U.S. citizens who are counting frogs as part of the U.S. Geological Survey's Frogwatch USA program. "With the melodious calls of Pa...

Scientists pinpoint mechanism for UV damage to rice plants

...zyme molecule can repair only one damaged site. So counting the number of damage sites repaired during a single flash gives a measure of the number of enzyme molecules in each rice cell. By varying the time before giving the single flash, the researchers can measure how the enzyme functions over time. If ther...

Wolves in Yellowstone may aid aspen recovery

... near Yellowstone Park were eliminated by 1926. By counting the annual growth rings on a sample of Yellowstone Parks aspen trees, the OSU research has determined that the 1920s were also the last decade in which aspen overstory trees were able to regenerate.When the wolves were eliminated the aspen overstory ...

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