Tag: "bottom" at biology news

AAAS Science Project/Unisys prize encourages student-led scientific inquiry on flight to soar

...arts, and twelfth-grade students languished at the bottom of the chart. A follow-up study in 1999 revealed no improvement in the U.S. students' level of achievement from 1995 to 1999. Working with local museums, each team of five or more students in grades 7-12 will unleash their imaginations as they pur...

UC Berkeley scientists detail neural circuit that lets eye detect directional motion

..., stacked one atop the other in the retina. At the bottom of the stack are the 12 or so different kinds of ganglion cells, including the directionally selective ganglion cells. If there were no other cells types, light shining on a photoreceptor would initiate a signal that cascades unaltered through the ce...

GSA release 02-55: Dec. Geology & GSA Today media highlights

...d from the waters of the surface ocean down to the bottom of the oceans. Such a progression implies a rapid...of sand or mud substrates, compare to that of soft bottom habitats in the marine realm? In less than 100 million years from the late Neoproterozoic (600 milli...

Phase transition in bilayers could affect their performance

...e defects as a result of the tearing process. "The bottom line is that history matters," said Steve Granick, a professor of materials science, chemistry and physics. "The method of preparing the gel phase strongly affects the resulting defect structure, and this in turn has considerable impact on the subse...

Microorganisms are cleaning up Boston Harbor, UMass study finds

... believed that once PAHs sank into the silt at the bottom of the harbor, they could not be oxidized or degra...," said Lovley, "so they collect in the mud at the bottom of the harbor." Previous research has shown that PAHs accumulate in fish and other aquatic animals, ...

Fiery ice from the sea

... of ice. There are mega-tons of the stuff at the bottom of the ocean all over the world and in the Arctic permafrost (about 300,000 trillion cubic feet of it) and it is the cleanest and most abundant source of energy in the world. There is at least twice as much of it around as fossil fuels (some say 10 ...

Fussy microbe holds promise for environmental cleanup

...report the discovery of a microbe dredged from the bottom of the Hudson River that has an insatiable appetite to break down the environmental pollutant TCA. "TCA was one of the remaining groundwater pollutants for which biodegradation had not been resolved," said James Tiedje, a University Distinguished Pro...

Health of American Indians on decline before Columbus arrived in new world

...t the slaves were so near the bottom in overall rankings, Steckel said. Their health was comparable to pre-Columbian Indian populations threatened with extinction. Many of the healthiest groups included in the index lived a...

Study shows fossil records remain stable in storm beds

...oldest storm-derived deposits are preserved at the bottom of the horizon and the youngest at the top. During the Ordovician, storm waves and currents would have pounded against the ancient ocean shelf as they do today. The storms could have shifted or scrambled the ancient sea floor habitats across geogra...

New England lakes hold clues to lurking storms and floods

... 20-foot pieces of 3-inch diameter PVC pipe to the bottom of the lakes and extracting core samples that were later sliced, photographed and painstakingly analyzed. "In each of the cores we looked for sandy layers of sediment that were washed into the lakes during rainstorm-induced floods," Noren explains. ...

Call me Ishmael

...l Research has built a tower bristling from top to bottom with sensors. The Air-Sea Interaction Tower will ...de is exchanged, and how currents and waves affect bottom sediments, makes for better weather forecasts," says science officer Simon Chang who oversees the pr...

Colorado U. to fly hardware, experiments on space shuttle, space station

... the normally heavier kidney cells settling to the bottom of the medium and growing in two-dimensional sheets, culturing them in the suspended state of microgravity causes their behavior to mimic normal, functioning kidney cells. Previous BioServe flights have documented changes in kidney cells and how the...

University of California, Riverside study dates our ancestors

... that the substrate conditions -- for example, the bottom of the ocean -- were such that if animals were burrowing or walking or crawling along the seafloor, their traces would have likely been preserved. We see a gradual increase in diversity and complexity of trace fossils from about 555 million years ag...

New role of genes in breast cancer

... increased risk of breast cancer than women in the bottom 20 percent for their age. "Although there is evidence that age and some lifestyle factors, such as having children, can change breast density, there is still a large spread in the distribution of breast density across women of the same age," says H...

If you booze, you lose: Even small amount of alcohol affects driving skills

...fect judgment and driving decisions. The study's bottom line: Even if you've consumed very little alcohol, your decision-making skills are hampered more than you realize and the results could be deadly considering that nationally, 38 percent of all traffic deaths involve alcohol. In Texas, the rate is a ...

MIT team probes arsenic and old lakes

...e summer they become stratified: cold water on the bottom is topped by a warm layer. The two don't mix and h...mple, the top layer is flush with oxygen while the bottom layer has none. The mystery that Senn and Hemond were exploring occurs in the bottom layer, which co...

Smoking pot alters more than mood human immune system affected, USF/UCLA study finds

...d the UCLA School of Medicine in Los Angeles. "The bottom line is you cannot routinely smoke marijuana without it affecting your immune system," said Thomas Klein, PhD, professor of medical microbiology and immunology at USF. "However, because of the complexity of the immune system, we can't say yet whether...

Scientists prove how geckos stick, unlock secrets to making artificial gecko glue

...s have millions of setae--microscopic hairs on the bottom of their feet. These tiny setae are only as long as two diameters of a human hair. That's 100 millionth of a meter long. Each seta ends with 1,000 even tinier pads at the tip. These tips, called spatulae, are only 200 billionths of a meter wide--belo...

Of mice and men: Deaf mouse leads scientists to new human hearing loss gene

...s is making it easier for scientists to get to the bottom of inherited deafness, which accounts for about half of all hearing loss in people under 30. Scientists estimate that half of all inherited hearing loss cases are due to mutations in a single gene called connexin 26, found in 1997. But researchers ar...

Why the hammerhead shark's head is in the shape it's in

...ased their swimming velocity and swam close to the bottom with the ventral surface of the head less than 2cm above the substratum. Both species demonstrated a feeding response by biting at the active dipole and ignoring the non-active dipoles. Sharks sometimes bit repeatedly at an active dipole but immediat...

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