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Tag: "pulse" at biology news

Electric fish conduct electric duets in aquatic courtship

...ntified nine common motor displays and 11 specific pulse sequences common to courtship and mating. "Knowing the electrical and motor patterns during courtship allows for further exploration of such topics as mate choice and neural basis of pattern generation in these fish," explained Hopkins, noting tha...

The power of one: A simpler, cheaper method for cell fusion

...quires a very expensive and specialized electrical pulse generator," said Lu, a professor of agricultural and biological engineering at Purdue University. "My device uses constant DC voltage and would enable researchers to fuse one pair of cells at a time." Electrofusion - the process of using electric ...

Gene-bender proteins may sway to DNA

...d a test protein from bacteria and applied a laser pulse lasting about 10 billionths of a second to heat up and disturb the protein-DNA complex. They watched the dynamics of the bound DNA in response to this perturbation. Ansari's group was the first to apply the laser temperature-jump technique to study...

Electric jolt triggers release of biomolecules, nanoparticles

...ered to a surface," he said. "We use an electrical pulse to cut the tether, and it floats away." This met...n command. The researchers then sent a brief, mild pulse of electricity through wires attached to each electrode. The current caused the bond between the sul...

Einstein researchers take the pulse of a gene in living cells

... notes. "We'd like to find out whether these genes pulse as well." Also involved in this study were Jonathan R. Chubb (now at University of Dundee in the U.K.), Tatjana Trcek and Shailesh M. Shenoy. ...

Pollen proves beneficial for northern lakes

...ually striking, but it can represent a substantial pulse of nutrients to northern lakes. Graham's research team found that plankton responded strongly to additions of pollen in experimental enclosures, located along the shorelines of three boreal lakes in northwestern Ontario's Experimental Lakes Area. "...

Heart has enough oxygen to survive hypothermia, CPR crucial

...mal. Doctors often cannot even detect a peripheral pulse to determine whether the heart is beating, Tveita said. In fact, victims of hypothermia may appear to be dead, even when they are not. Understanding the body's physiological response to hypothermia became a popular research topic 40 years ago, when...

Sea coral's trick helps scientists tag proteins

...ns to red when the tags are zapped with an intense pulse of visible blue light. The dramatic color change "makes it possible to precisely label an object, such as a cell, organelle, or protein, with a flash of light and then to follow the object's movement over time," said Konstantin Lukyanov, whose group...

Mechanism for memory revealed in neurons of electric fish

...ng their eyes and closing them," says Zakon. "Each pulse of electricity is a snapshot of the environment. These guys are swimming around and discharging at a very regular frequency. They're digitizing their environment." But a problem occurs when the fish are close to each other. They can jam each other's...

Vaccine provides 100 percent protection against avian flu virus in animal study

...microbial communities, we can begin to measure the pulse of this marine ecosystem," said MIT's Ed DeLong, who led the research team. "These new DNA sequences from microbial communities will help us paint the picture of how that world works and provide important details on the players involved and their bio...

Wyoming cloud seeding experiment begins this month

...microbial communities, we can begin to measure the pulse of this marine ecosystem," said MIT's Ed DeLong, who led the research team. "These new DNA sequences from microbial communities will help us paint the picture of how that world works and provide important details on the players involved and their bio...

Sequencing our seas

...microbial communities, we can begin to measure the pulse of this marine ecosystem," said MIT's Ed DeLong, who led the research team. "These new DNA sequences from microbial communities will help us paint the picture of how that world works and provide important details on the players involved and their bio...

Rare Tibetan antelope listed as endangered

...es parallel processing to listen to echoes of each pulse in 16 directions at once. The laparoscopic ultrasound probes have so far been applied only to heart imaging, in which they may be particularly useful for monitoring heart function during minimally invasive cardiac surgery, Smith said. Current method...

3D ultrasound device poised to advance minimally invasive surgery

...es parallel processing to listen to echoes of each pulse in 16 directions at once. The laparoscopic ultrasound probes have so far been applied only to heart imaging, in which they may be particularly useful for monitoring heart function during minimally invasive cardiac surgery, Smith said. Current method...

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." ...

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, Galán's...

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 dis...

Science's Breakthrough of the Year: Watching evolution in action

...olent behaviors of neutron stars. A short, intense pulse of radiation from near the center of the Milky Way, recorded on 27 December 2004, may be the result of a short gamma ray burst -- a rapid merger of two ancient neutron stars or a neutron star and a black hole. Brain Wiring and Disease: Several stud...

Study uncovers dirty little secret: Soil emissions are much-bigger-than-expected component of air pollution

...d that we could see it from space, but because the pulse is so big the satellite can see it," she said. So...sing nitrogen. The satellite then detects a sudden pulse of nitrogen oxides, Jaeglé said. Similarly, emissions in the mid-latitudes of the Northern Hemispher...

A probe, not an echo

...UTT system transmits an extremely short ultrasonic pulse (about 250 nanosecond) of 4-12 megahertz frequency (far above human hearing) and picks up the pulse on the other side after it has traveled through the imaged object. The transmitted pulses come from...

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