Tag: "pulse" at biology news
Acoustics meeting in San Diego
...oustics. In this approach, a device sends a short pulse
of ultrasound to a material and detects the long echo caused by the initial pulse
as it spreads out, as well as multiple reflections of the wave bouncing like a ping-pong ball from t...
Study is looking at ways to help stroke survivors regain lost motor skills
...ollarbone, which is then hooked up to an implanted pulse
generator. The device is turned on only during a ...s affected by stroke. The electrode connects to a pulse
generator implanted below the collarbone. At the end of six weeks of intensive occupational therapy...
'Broken' gene reveals evolution of salt retention and possible ties to hypertension
...ellow Emperor's Classic of Internal Medicine, "the pulse
hardens, tears make their appearance and the complexion changes." About two thousand years later, too much salt has become the norm. Despite a recommended daily allowance of less than six grams of salt, the average American consumes about 10 grams...
Animal experiments more stressful than previously recognized
...flood the bloodstream, the mouse exhibits a racing pulse
and a spike in blood pressure. These symptoms can persist for up to an hour after each event. Immune response is also affected. In rats and mice, the growth of tumors is strongly influenced by how much the animals are handled. Dr. Balcombe's paper a...
New lensless imaging technique opens door to nanoscale world
...ate changes in nanometer-sized materials. Just one pulse
of X-ray light, rather than billions of pulses, will be needed to capture a clear picture of the action at that moment in time. Scientists could take a series of such images to create a "movie" of the changes, analogous to time-lapse photography for ...
Cricket's finicky mating behavior boosts biodiversity
...n the Laupala genus detect tiny differences in the pulse
rates of male courtship songs, which differ from o...turns a female cricket on? Why does she prefer one pulse
rate over another? Whatever the reason, it's very important that she exercise this preference in ord...
New system can measure productivity of oceans
... phytoplankton we have to know, to really take the pulse
of the oceans. That's the missing piece of the puzzle."The new approach is based on the premise that the 'greenness' in phytoplankton its level of pigmentation per cell is a reflection of its growth rate, said David Siegel of the University of Cali...
South America's vast pantanal wetland may become next everglades, UNU experts warn
... environmental changes, such as altering the flood pulse
by building dams or changing water quality by increasing the sediment load in rivers." "As economic development proceeded rapidly however, new stakeholders emerged along with the industrialization such as agriculture, modern cattle ranching, transpo...
Remote control flies?: Fly behavior controlled by laser light
... to recognize an outside signal like a laser light pulse
and translate that signal into the electrical signals characteristic of nerve-cell activity. To accomplish this, Miesenbck and Lima devised a triggered molecular lock and key system, where the "lock" was the receiver genetically encoded to be express...
World Ocean Day: How satellites safeguard our waters
...ich function by measuring the precise time a radar pulse
takes to bounce back to its satellite. The French firm CLS (Collecte, Localisation Satellites), with support from French space agency CNES, processes altimetry data from the satellites ERS-2, Envisat, GFO, TOPEX/Poseidon and Jason-1 in the frame of ...
Deep-sea jelly uses glowing red lures to catch fish
...t different tasks. Some form swimming bells, which pulse
slowly, pulling the colony through the water like a long, fluid freight train. Others specialize in feeding, and sport stinging tentacles. Almost all siphonophores are bioluminescent, but scientists know little about why and how they glow. Siphonop...
Study in Royal Society journal on world's only horned rodent
...ous acoustic parameters, including peak frequency, pulse
duration, number of peaks per pulse, differed between the two populations. The geographic comparison is the first to demonstrate dialects in a marine fish species. These results highlight the possible approach for investigating the role of sounds in ...
APS physics tip sheet #51
... solid sample into a state in which a signal light pulse
can be trapped. Most previous stopped-light demonstrations have used atomic gases, rather than solid-state materials. Light had previously been stopped in a solid (yttrium-silicate doped with atoms of praseodymium), but only for a few milliseconds. A...
Study in Royal Society journal on possiblity of human organ regeneration
... of whale sharks in relation to a predictable food pulse
by Dr RT Graham, Professor CM Roberts and Dr JCR S...our whale sharks in relation to a predictable food pulse
(reef fish spawn) and an analysis of the longest continuous fine-resolution diving record for a plan...
Ecologists spawn new use for PIT tags
...nd then whipped around in tests of air sparger and pulse
jet mixer equipment in large test tanks and scaled...n tanks. Technologies under consideration included pulse
jet mixers, air spargers and steady jets generated by recirculation pumps. In one test of an air spa...
Bugs expose underground carbon traffic system 10 times more important than fossil fuel burning
...pe of carbon, 13C) for 7 hours, a technique called pulse
labelling. Concentration of 13C in cores was then analysed. The soil cores which were exposed to the mites were found to have 32% less 13C than the control cores. This showed that Collembola's consumption of the arbulscar mycorrhizal mycelia had disr...
New study into public views on diet and health research published
...ighted that BBSRC and IFR have put a finger on the pulse
of public opinion at this important time to examine public priorities for research funding in the area of diet and health. The results are most illuminating and provide evidence of public thinking and priorities at a time when discussion about the h...
Stimulating the brain makes the fingers more sensitive
...on of the brain. Short bursts of a strong magnetic pulse
stimulate electrical currents within. Sensory input from each region of the body is represented on the surface of the brain, and the location of any region--in this case, the right index finger--can be mapped to allow precise targeting of the rTMS. T...
Team led by Carnegie Mellon University scientist finds first evidence of a living memory trace
...as revealed a short-term, stimulus-specific neural pulse
within the living brain that occurs after exposure to a previously unknown stimulus." "Future investigations along the lines of our study may reveal previously overlooked memory traces in many other neural systems," said C. Giovanni Galizia, Galn's p...
T-rays: New imaging technology spotlighted by American Chemical Society
...e have also devised a system that captures the THz pulse
emitted during rapid intramolecular charge transfer using two different dye molecules," he said. "In the future we will use this method to probe photosynthetic and bacterial reaction centers, and perhaps DNA."...
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