AGU journal highlights -- Aug. 6, 2009
... variability in the northern Indian Ocean
fjords increase ocean mixing
Anyone may read ...
13. Closely spaced
fjords increase ocean mixing
Ocean mixing ... known as internal waves, are modified by closely spaced
submerged ridges, or sills, Xing and Davies ...
Killer whales, blind bats, discriminating dolphins, mating birds
... distance of their sonar gaze to inspect closely spaced
objects and targets sequentially.
At the ... to enable it to gather information about closely spaced
objects (a complex environment) simply by ... acoustic information separately from closely spaced
objects. The bat also modifies the duration of ...
Findings a step toward making new optical materials
... by positioning tiny particles onto a silicon template containing precisely spaced
holes that are about one-hundredth the width of a human hair. The template ... in a tube placed in a pool of water. It's critical for the particles to be spaced
properly prior to the Langmuir-Blodgett deposition so that water can draw ...
Reading the brain without poking it
... The first patient received two identical arrays, each with 16 microelectrodes arranged in a four-by-four square. Individual electrodes were spaced
1 millimeter apart (about one-25th of an inch). Patient 1 had the ECoG and microECoG implants for a few weeks. The findings indicated the electrodes ...
NIST issues first reference material for tissue engineering
... infuse the structure and receive nutrients, but healthy cell growth also depends on the cells immediate surroundings. If the pores are too large or spaced
too far apart, cells will be unable to build the proper connections.
The three new NIST reference materials are disks approximately 20 millimeters ...
Findings uncover new details about mysterious virus
... virus's structure," Rossmann said.
Researchers took images of the virus using an atomic force microscope, revealing a pattern of holes regularly spaced
throughout the virus's outer shell.
"The capsids of most other large, pseudo icosahedral viruses do not contain such holes, and their function is ...
Engineer devises ways to improve gas mileage
... that the transonic drag of an airplane wing can be reduced by 12 to 15 percent with the incorporation of three-ounce actuators, about 20 to 30 spaced
optimally on the surface of the wing.
"We use the genetic algorithms and artificial neural net algorithms to optimize the placement of actuators." ...
New holographic method could be used for lab-on-a-chip technologies
... device consists of two parallel electrodes made of indium tin oxide, a transparent and electrically conductive material. The parallel plates were spaced
50 micrometers, or millionths of a meter, apart, equivalent to two-thousandths of an inch or about the diameter of a human hair. A liquid sample ...
December 2008 Geology and GSA Today media highlights
... into two sequences: basal sand-rich sequence deposited in a basin floor setting, and an overlying younger mud-rich sequence, characterized by densely spaced
seabed and sub-seabed distributary slope channel complexes.
Earthworms produce granules of intricately zoned calcite
Martin R. Lee et al., ...
Following the leader can be a drag, according to student's research on flapping flags
... unexpected," Ristroph said. Additional experiments with multiple flags and different spacing showed that the effect is consistent for closely spaced
objects and drops off as the space between them increases.
The effects aren't fully understood, Ristroph said. "It appears that the follower is ...
NJIT professor's research suggests changes in underwater data communications
... could shrink the size of the receiver receiving the data.
"Today existing receivers rely upon separated pressure-only sensors that are spaced
far apart," Abdi said. "Needless to say, array size can be a serious limitation in many situations, including the modern applications of small, ...
Signals from the Atlantic salmon highway
... that extend from Brewer, on the Penobscot River near Bangor, into the Gulf of Maine. The local receivers, about the size of a standard flashlight and spaced
about a half mile apart, act much like the EZ pass system at highway toll booths - when a fish swims near the receiver, its identity and the time of ...
Fruit fly helps identify protein critical to eggshell formation that may be pesticide target
... and orientation. Remove palisade, and you get microvilli of different lengths pointing in different directions surrounding odd-sized, irregularly spaced
"We dont exactly know what they are doing with the vitelline bodies," Dr. LeMosy says of microvilli. "What we think is going on is ...
Is there anybody out there?
Each step is independent of the other and can only take place after the previous steps in the sequence have occurred. They tend to be evenly spaced
through Earths history and this is consistent with some of the major transitions identified in the evolution of life on Earth.
Carnegie Mellon develops computer model to study cell membrane dynamics
... simulation of a cell membrane with a lipid bilayer a soap-like film made of 50,000 individual lipids molecules and studded it with 36 evenly spaced
and contact lens-shaped disks representing remodeling proteins, which are involved in vesiculation. Then he set the simulation to allow the fluid ...
The surprising power of the pill
... old wives tales persist about days of the month when women can conceive, Dr. Pinkas says it is bunk. The timing of ovulation for different women is spaced
out evenly throughout the year. We can schedule a womans ovulation with contraceptive pills, but not with the moon.
New radar satellite technique sheds light on ocean current dynamics
... on these conclusions ESA upgraded its ASAR ground segment in July 2007 to systematically process and disseminate a Doppler grid product, a regularly spaced
collection of individual Doppler information, for all Wide Swath acquired images.
The Doppler grid, embedded in ESA standard products, is now ...
Research forecasts increased chances for stormy weather
... available today of what is happening across the United States.
The regional model divides the landmass of the United States into a grid of cells spaced
25 kilometers, or 15.6 miles, apart and provides information about the conditions occurring for each cell. This adds detailed information to the data ...
New hypothesis for origin of life proposed
... of nitrogenous bases, sugar, and phosphates. RNA and many proteins and lipids in our cells have negative charges like mica. RNAs phosphate groups are spaced
one half nanometer apart, just like the negative charges on mica.
Mica layers are held together by potassium. The concentration of potassium ...
New system would use rotating magnetic field to detect pathogens
... separation, works using an array of disks made of cobalt and coated with chromium to prevent corrosion. The disks are regularly, or periodically, spaced
on the surface of the silicon chip.
An advantage of the non-linear magnetophoresis technique is that it can be used to simultaneously separate and ...
Tracing the formation of long-term memory
Davis and his colleagues used spaced
training to teach the flies to associate an odor ... that can last days. In this study, the five spaced
trials produced a memory that lasted for more ... flies or Drosophila to the odor 24 hours after spaced
training, they saw much more calcium flowing into ...
FSU biologist says new dinosaur is oldest cousin of Tyrannosaurus rex
... Those of the larger animal had seven closely spaced
rings –?revealing rapid growth to young adulthood –?followed by six widely spaced
rings corresponding with slower growth to full ... of the smaller specimen had only six closely spaced
rings and no ...
Major gene study uncovers secrets of leukemia
... more than 350,000 markers called single nucleotide polymorphisms. Single nucleotide polymorphisms are individual variations in the DNA that are spaced
across the human chromosomes. Single nucleotide polymorphisms function as flags for researchers, allowing them to detect specific deletions of DNA in ...
Groundbreaking Canadian asthma study
... areas of underlying smooth muscle in the airways. The procedure is completed in three treatment sessions, each lasting less than one hour, and spaced
apart by about three weeks. The procedure, like many other flexible endoscopy procedures, is done under light anesthesia, and the patient returns ...
Proteins necessary for brain development found to be critical for long-term memory
... a marine snail frequently studied in learning and memory because of its large brain cells. The Aplysia received a series of five tail shocks, spaced
15 minutes apart. The shocks cause the animals to exhibit heightened withdrawal reflexes days and weeks after the shocks are over.
When the ...
Ferns provide model for tiny motors powered by evaporation
... the hit with light, causing a pattern. The residual pattern is lifted off and that is used for the device. It resembles a curved spine with equally spaced
ribs fanning outward from the spine.
To make the device move, Borno said, they load the space between the ribs with water, and when the water ...
Slow brain waves play key role in coordinating complex activity
Knight and his colleagues continue to probe the connection between waves of different frequency in the brain and are building a more closely spaced
grid of electrodes that can measure finer detail on the brain's surface. They also plan to combine brain grid recordings with recordings from ...
MIT designs portable 'lab on a chip'
... each end of the channel, as in capillary electro-osmosis, the voltage can be lowered substantially with alternating current (AC) applied at closely spaced
microelectrode arrays on the channel floor. Existing AC electro-osmotic pumps, however, are too slow for many applications, with velocities below 100 ...
H9N2 avian flu vaccine paired with adjuvant provokes strong human immune response at low doses
... An additional 48 volunteers received MF59-adjuvanted vaccine at one of the same four dosages. Volunteers were vaccinated twice, with inoculations spaced
28 days apart.
An avian flu vaccine, like the seasonal flu vaccine, should stimulate antibodies, which help ward off infection if the vaccinated ...
University of Minnesota researchers take new look at cellular suicide
... for the "thread" of DNA molecules. Rather than float in the cell nucleus like an overlong piece of spaghetti, the DNA molecule loops around regularly spaced
histones, which not only support the DNA but play various roles in managing its functions.
"In the past, people thought histones were just for ...
In-home sensors spot dementia signs in elderly
... engineering at OHSU's OGI School of Science & Engineering, and the study's lead author. She noted that most clinic visits by elders are spaced
over months or even years, and their memory and motor skills performances are evaluated in a small number of tests completed in a limited amount of ...
Protein 'nanosprings' most resilient found in nature
... a large range of applied forces, the team found. When extended past their breaking points, the molecules exhibited a saw-tooth pattern of regularly spaced
force peaks as individual repeats unraveled one by one, they said.
After this complete unfolding of the protein, the researchers observed that ...
Newly discovered birdlike dinosaur is oldest raptor ever found in South America
Buitreraptor is remarkably different than other domaeosaurs, most obviously due to its long, slender snout and relatively small, widely spaced
teeth. Unlike most other theropods, the teeth of Buitrearaptor lack the steak-knife-like serrations along their edges. Although scientist are unsure ...
Spiders help scientists discover how muscles relax
... the level of detail that it showed," Padron said.
The structure provides crucial new details. A twisting, symmetrical arrangement of myosin heads spaced
around the filament's circumference surrounds a backbone made up of 12 parallel strands or sub-filaments. "This is the first time that the structure ...
A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs
To test the hypothesis that embryos use these features of vibrations to assess danger, Warkentin clumped the rain recordings together into tightly spaced
segments, making them more snake-like. Conversely, she spliced bits of stillness into the snake vibrations, making them more rain-like. When ...
Flocking together: Study shows how animal groups find their way
... simulated animals with a basic urge to stay near others, but not collide with them. This instinct alone caused individuals to form close-knit, evenly spaced
groups like those of real animals, which pay a high price -- such as being eaten -- if they stray from their group.
Second, a few animals were ...