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Tag: "pulses" at biology news

3D ultrasound device poised to advance minimally invasive surgery

...sensors at the tip of the tube, which in turn send pulses of acoustic waves into the surrounding tissue, Smith explained. The sensors then pick up the returning echoes and relay them back to the scanner where they produce an image of the moving tissue or organ. The scanner uses parallel processing to listen...

Rare Tibetan antelope listed as endangered

...sensors at the tip of the tube, which in turn send pulses of acoustic waves into the surrounding tissue, Smith explained. The sensors then pick up the returning echoes and relay them back to the scanner where they produce an image of the moving tissue or organ. The scanner uses parallel processing to listen...

Mechanism for memory revealed in neurons of electric fish

...avoid the jamming signal, emitting more electrical pulses per second than its neighbor. Oestreich and Zakon found that once the jamming avoidance has started, the fish's neurons continue to discharge at a higher frequency, even after its neighbor fish may have swum away. The researchers discovered that ...

Engineered heart tissue offers insights into irregular heartbeats, defibrillator failure

... said. "After a short period, we applied trains of pulses in an attempt to terminate this wave." The pulses successfully halted the wave 80 percent of the time, they reported. In the remaining cases, however,...

Research tracks whales by listening to sounds

...deployed in the ocean to record the unique clicks, pulses and calls of different whale species. Those efforts are leading to some surprising findings, including the discovery by a team of researchers of rare right whales swimming in the Gulf of Alaska. "There has been only one confirmed sighting of a righ...

Device effective in zapping the pain out of migraines

...t results in a throbbing headache. "The device's pulses are painless. The patients have felt a little pressure, but that's all," said Mohammad, who is principal investigator of the study at Ohio State . "In our study sample, 69 percent of the TMS-related headaches reported to have either no or mild pain...

Robotic joystick reveals how brain controls movement

...g as the robot driver pushed repeatedly - in quick pulses - to one side. The joystick then pushed repeatedly in the opposite direction and again the subjects were asked to keep the joystick centered. The research team found that after all this pushing in different directions the subjects still were inclin...

New approach to vaccine development provides potent, long-lasting immunity

...g as the robot driver pushed repeatedly - in quick pulses - to one side. The joystick then pushed repeatedly in the opposite direction and again the subjects were asked to keep the joystick centered. The research team found that after all this pushing in different directions the subjects still were inclin...

Einstein researchers take the pulse of a gene in living cells

...has been indirectly observed and only in bacteria: pulses of transcription that turn on and off at irregular intervals. Dr. Singer and his co-workers used a fluorescent marker that sticks to the gene only when it is active. Under a microscope, this fluorescent marker appears when the gene turns on, then dis...

Nanotubes used for first time to send signals to nerve cells

...ual cells and record their responses to electrical pulses transmitted through the SWNTs. In addition to their electrical stimulation experiments, the scientists also studied how different kinds of SWNTs affected the growth and development of neuroblastoma cells. They compared cells placed on mats made of "...

Interfering RNA silences genes in 'slippery' immune cells

...chnology uses specialized solutions and electrical pulses to temporarily open a cell nucleus. Into the nucleus, researchers insert a payload of DNA. The DNA holds a sequence of genetic code that produces a specific siRNA after it enters a nucleus. The researchers encased the DNA within an siRNA expression...

A simple feedback resistor switch keeps latent HIV from awakening

...ral concentration. According to the authors, these pulses of viral activation may be due either to random increases of Tat activity or to environmental inhibitors of the SirT1 enzyme, such as dihydrocoumarin, a natural flavoring agent found in clover. ...

Scientists get best look ever at water-life connection

...istant professor of physics, used ultra-fast laser pulses to take snapshots of water molecules moving around a protein taken from a common bacterium, Staphylococcus. The key to getting a good view of the interaction was to precisely locate an optical probe on the protein surface. They inserted a molecule o...

Slow brain waves play key role in coordinating complex activity

...axed or idling brain or the fast, seemingly random pulses accompanying dream sleep - are generated by coordinated firing of neurons in the brain triggered by waves of excitability that wash over an area. Waves of excitability in the theta range of oscillations lower the threshold for neuron firing, making i...

Edge density key to controlling gypsy moth spread

...pulsed expansion occur, but it mimics the historic pulses of the gypsy moth population from 1960 to 2002 found in the quarantine records. Currently, the containment program for gypsy moths aims at controlling outbreaks outside the current population boundaries. The researchers suggest that "the invasion m...

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

...along an electrical field before zapping them with pulses of electricity. Lu's technology is more precise. "In my device, the narrow section in the microfluidic channel is so small that only two to three cells fit into it," Lu said. Lu said he believes that his device may be developed to have a higher...

German researchers develop first non-invasive test to measure skin aging

...e imaging technique use the ability of ultra-brief pulses of laser infrared light to stimulate tissues to em...e infrared laser can reach the dermis with intense pulses of light without damaging the upper layers. By two different quantum processes, collagen and elastin...

MIT: Pulsing light silences overactive neurons

...nted a way to reversibly silence brain cells using pulses of yellow light, offering the prospect of controlling the haywire neuron activity that occurs in diseases such as epilepsy and Parkinson's disease. Such diseases often must be treated by removing neurons that fire incorrectly. The new MIT research c...

Satellites shed light on global warming

...meters work by sending thousands of separate radar pulses down to Earth per second then recording how long their echoes take to bounce back to the satellite platform. The sensor times its pulses' journey down to under a nanosecond to calculate the distance to the planet below to a maximum accuracy of two ce...

A 'traffic light' for neurons means 'go' for improving brain research

... Combined, the two genes can now make neurons obey pulses of light like drivers obey a traffic signal: Blue ... genetically altered motor neurons were exposed to pulses of yellow light focused through a microscope. In some experiments, exposure to blue light caused the...

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