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Tag: "pulses" at biology news

UCSB scientists probe sea floor venting to gain understanding of early life on Earth

...s," said Haymon. "Such widespread and oft-repeated pulses of hydrothermal venting may stimulate microbial blooms on abyssal hill fault scarps, thus providing a potential food source for ridge flank biota, and an opportunity for researchers to sample the biosphere below the sea floor." The sides of abyssal ...

“Nano-scissors?laser shows precise surgical capability

...ique used a series of low-energy“femtosecond?laser pulses to partially sever the axons of severalanesthetized C. elegans, a widely studied type of roundworm about onemillimeter long. A femtosecond is one millionth of a billionth of asecond.“The time is very important here,?she says. “Because it happens sofa...

Poplar trees redirect resources in response to simulated attack

...ese positron radiographs by administering discrete pulses of carbon-11-labeled carbon dioxide gas to a single intact leaf of a poplar sapling and taking a snapshot of the distribution of carbohydrates that incorporated the C-11 radiotracer via the process of photosynthesis one hour later. Panel A shows the ...

Cricket's finicky mating behavior boosts biodiversity

...rates of male courtship songs range from .5 to 4.2 pulses per second. Female crickets can detect these differences, says Mendelson, and they tend to hop towards the pulse rate of their own species and to reject songs sung at a different tempo. The Laupala mating ritual lasts up to eight hours and consists ...

Pulsating ultrasound enhances gene therapy for tumors

High-intensity focused ultrasound emitted in short pulses is a promising, non-invasive procedure for enhanci...rom the National Institutes of Health (NIH), short pulses of HIFU can be used to prevent exposed tissue from becoming too hot and damaged. Pulsed-HIFU instead...

Alarm pheromone causes aphids to sprout wings

...t pests in Europe, it may prove effective to apply pulses of alarm pheromone to infested fields. ...

Remote control flies? Fly behavior controlled by laser light

...ultraviolet-wavelength laser in brief, millisecond pulses at the flies trapped inside a glass-domed arena. On command, the flies began a series of escape movements--extending their legs, jumping, and opening and rapidly flapping their wings. The laser-triggered remote controls in the giant fiber system wor...

A probe, not an echo

...aveled through the imaged object. The transmitted pulses come from an array of very small ultrasonic transd...rray of transducers on the other side receives the pulses after they travel through the imaged tissue. A sophisticated coding/decoding signal scheme recogniz...

Researchers test new therapy for advanced melanoma

...ch a hand-held device applied to the skin delivers pulses of electricity to open up pores in the tumor cell membrane. This opening allows a small therapeutic molecule -- in this case a molecule known as a DNA plasmid that contains the gene for Interleukin-12 -- to slip inside the melanoma tumor before the m...

New tool reveals secrets of migrating cells

...e employs an infrared laser emitting short intense pulses of 920 nanometer-wavelength light. In the thymus, it's possible to view cells 400 microns inside the cortex, which is about 4/10 of a millimeter or more than a hundredth of an inch deep. In the current study, Witt limited her viewing to about 200 mi...

Fluorescing lab worms signal longer life spans

... device that separates them into groups with short pulses of air was used during the study. One of only six such instruments in the United States, the machine can sort about 30 worms per second, Johnson said. Genetic testing on both the bright and dim worms revealed that the levels of the green fluorescent...

Deep sleep short-circuits brain's grid of connectivity

... the disconnect when brief, magnetically generated pulses of electricity were directed to specific regions of the brain. The pulses stimulated an electrochemical response from the targeted cells, which, when the subject was awake, r...

Frog peptides block HIV in lab study

... the disconnect when brief, magnetically generated pulses of electricity were directed to specific regions of the brain. The pulses stimulated an electrochemical response from the targeted cells, which, when the subject was awake, r...

Insulin pulses keep the liver lean

...dy uncovered a new mechanism whereby acute insulin pulses limit fat synthesis in the liver. This protective ... time. In that case, the liver no longer perceives pulses of the hormone and becomes resistant." The researchers found that insulin pulses acutely reduce the...

Envisat and ERS-2 reveal hidden side of Hurricane Rita

...instrument called the Radar Altimeter-2 uses radar pulses to measure sea surface height (SSH) down to an accuracy of a few centimetres. Near-real time radar altimetry is a powerful tool for monitoring a hurricane's progress and predicting its potential impact. This is because anomalies in SSH can be used ...

Scientists get first glimpse at how plants, most animals repair UV-damaged DNA

...uld receive from visible light. Because the light pulses lasted less than a trillionth of a second, the researchers were able to make a very fast series of measurements to follow how the chemical reaction evolved over time. They assembled their measurements together like a series of stop-motion photograph...

What Makes The Brain Tick, Tick, Tick: Researchers Gaining New Insights Into Brain's Internal Clock

...gical pacemaker that regularly emits neural timing pulses or "ticks." However, more recent research by Meck and his colleagues at Duke, has led to the development of a "striatal beat frequency" model of interval timing involving the "coincidence detection" of oscillatory patterns of neural activity. The str...

Purdue's gold nanorods brighten future for medical imaging

...y. Imaging methods might be developed using laser pulses in longer wavelengths of light, beyond the visible range in a region of the spectrum called near infrared. "There is a window of light in the near infrared, wavelengths from about 800 to 1,300 nanometers, which could be harnessed for new imaging tec...

Scientists develop nanotech-laser treatment that kills cancer cells without harming healthy tissue

.... He also has patented another technique that uses pulses of near-infrared light to shake the DNA molecule loose from the carbon nanotube after they've entered the cell. The idea is to use the nanotube to deliver therapeutic molecules of DNA, RNA or protein directly into the cell nucleus to fight various in...

Cyberkinetics, Case to develop system to help restore extremity function

.... When FES is being used to move muscles, current pulses in the electrodes cause the weakened or paralyzed ... controls the strength and timing of the low-level pulses that flow to the electrodes. The sensors or switches control the starting and stopping of the pulse...

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