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Pulse in Biological News

Jet-propelled imaging for an ultrafast light source

... a way past this dilemma. The idea is that a quick pulse of tightly focused x-rays can be diffracted from ... even a single protein or virus in solution. The pulse is so brief that it comes and goes before any of ... light. Just as important, a sufficiently brief pulse may terminate before radiation damage effects can ...

DOE-funded research projects win 46 R&D 100 Awards for 2009

... at the speed of light, and then determines if the pulse meets the bandwidth requirements to avoid ... Spectral Sentry can stop the speed-of-light pulse it just measured from further amplification, ... controlled high temperatures. The PulseForge and pulse Thermal Processing systems provide a ...

Killer pulses help characterize special surfaces

... sitting between the two extremes. The killer pulse is a short duration laser pulse with a variable electric field. When the electric ... enhancement is really big, it takes only a weak pulse to kill it," Dlott said. "If the molecule is in a ...

A novel X-ray source could be brightest in the world

... APS is delivering. In an X-FELO, the electron pulse enters an undulator and generates an x-ray that ... source. The intensity of individual x-ray pulse from an X-FELO is lower by about three orders of magnitudes. However the X-FELO pulse has extremely narrow bandwidth, three to four ...

Female katydids prefer mates 'cool' in winter and 'hot' in summer

... during the summer, produce calls with a higher pulse rate than winter males, or those that mature in ... In the study, females had strong preferences for pulse rates within a narrow range. The attractive ... between summer and winter females. Both male pulse rate of calls and female preference ...

Environmental setting of human migrations in the circum-Pacific Region

... years BP gave rise to the first major pulse of migration, when modern humans spread from ... levels, creating conditions amenable for a second pulse of human migration into North America across an ... coral reefs, which in turn gave rise to a third pulse of coastal settlement, filling in most of the ...

Laughing hyenas, wailing levees, the sound of cheese and blaring bagpipes

... by thin membranes that are coated with DNA before injection. A targeted pulse of ultrasound energy "rings" the bubbles like a bell, popping them in a ... The resulting explosion of steam it creates can generate a 210 decibel pulse of sound. Currently, Jones is tailoring two different kinds of visible ...

Models of eel cells suggest electrifying possibilities

... point the process becomes self-perpetuating, resulting in an electric pulse traveling through the cell. The channels then close and alternate paths ... an artificial cell generates more than 40 percent more energy in a single pulse than a natural electrocyte. Another would produce peak power outputs over ...

New technique determines the number of fat cells remains constant in all body types

... May 4 early online edition of the journal Nature, the scientists used the pulse of radiocarbon to analyze fat cell turnover in humans. Radiocarbon or ... butatmospheric testing of nuclear weapons from 1950-1963 produced a global pulse in the amount of radiocarbon in the atmosphere, Buchholz said. In the ...

Researchers find origin of 'breathable' atmosphere half a billion years ago

... refer to this sudden influx of oxygen during the SPICE event as a pulse or burst. After this pulse of oxygen, the world remained in an essentially stable, warm climate, ...

August 2009 Geology and GSA Today media highlights

... magnetic field underwent a period of relative stability. In the past, the cause of these substantial changes was believed to be due to a rapid pulse of seafloor spreading. However, it has also been suggested that new mid-oceanic ridges, created after the breakup of the supercontinent Pangea, were ...

Results of national assessment of first responder location systems to be announced Aug. 3

... The WPI system also provides physiological monitoring of first responders via a sensor-equipped shirt developed by Foster Miller and a wireless pulse oximeter developed at WPI. ...

Spring cold snap helps with stream ecosystem research

... 2007 spring freeze" describes how a small change in canopy cover can dramatically impact a stream. "The study implies that the algal productivity pulse in the stream that drives the ecosystem during the spring months could be shortened with climate change if leaf-out continues to occur earlier each ...

The sound of light: Innovative technology shatters the barriers of modern light microscopy

... which in turn result in tiny local volume expansions. This happens very quickly and creates small shock waves. In effect, the short laser pulse gives rise to an ultrasound wave that the researchers pick up with an ultrasound microphone. The real power of the technique, however, lies in ...

Cantabrian cornice has experienced seven cooling and warming phases over past 41,000 years

... that were well-adapted to environments with only sparse vegetation. "When climatic conditions became more mild at the end of the last cold pulse of the Late Pleistocene, known as the Dryas III, forest-dwelling rodents and insectivores flourished and become more frequent in the associations", ...

Scholar unconvinced new lie-detection methods better than old ones

... in the fMRI scanner." The second common assumption, she said, is that "when you look at the body and get some kind of information whether it's pulse rate or blood oxygenation level dependent (BOLD) signals, or whatever it is that each is measuring that somehow you're able to see the body in ...

Lyncean Technologies Inc. receives $1.2 M from NCRR to develop new imaging technique

... (PSI). The CLS technology is based on an electron beam stored in a miniature storage ring colliding repeatedly with an opposing infrared light pulse stored in a high-finesse cavity. Each collision produces x-rays through inverse Compton scattering. The entire x-ray source fits in a 10x25 ft room ...

Towards a natural pacemaker

... Artificial heart pacemakers have saved and extended the lives of thousands of people, but they have their shortcomings such as a fixed pulse rate and a limited life. Could a permanent biological solution be possible? Richard Robinson and colleagues at New York's Columbia and Stony ...

Caltech and UCSD researchers shed light on how proteins find their shapes

... method of watching proteins as they crumple and fold involves the use of a picosecond camera that captures fluorescent flashes as a laser pulse excites a donor probe, which emits light and transfers that light to an acceptor probe. The distance between the donor and acceptor change as the ...

Fluorescent proteins illuminating biomedical research

... use in imaging mammalian cells, expanding the applications of fluorescence microscopy. Among these are PAFPs that can be turned on and off with a pulse of light, FPs that can fluoresce in different colors, and FPs that have better resolution for deep-tissue imaging. Most recently, Dr. Verkhusha ...

First Science from the Compact Light Source: A miniature synchrotron for your home lab

... (PSI). The CLS technology is based on an electron beam stored in a miniature storage ring colliding repeatedly with an opposing infrared light pulse stored in a high-finesse cavity. Each collision produces x-rays through inverse Compton scattering. The entire x-ray source fits in a 10x25 ft room ...

MIT develops new way to fuse cells

... can only hold two cells, so each ends up with one A and one B. After the cells are paired in the traps, they can be joined together by an electric pulse that fuses the cell membranes. In addition to helping with studies of stem cell reprogramming, this technique could be used to study interactions ...

Novel technique for fluorescence tomography of tumors in living animals

... tomographic principles. Early photons are the first photons that arrive onto a photon detector after illumination of tissue by an ultra-short photon pulse and undergo less scattering in comparison to photons arriving at later times. Compared to continuous illumination measurements a combination of these ...

Isopora or isn't it?

... and Indo-Pacific regions. "We now know that Isopora last occurred in the region during the late Pliocene, a million years ago as part of a pulse of extinction, in which several genera that live today in the Indo-Pacific became extinct in the Caribbean," said Budd, "This research has further ...

Moving new technologies from the lab to the marketplace

... manufacturing, opto-electronics, life sciences and material handling. This year, he received two more awards -- one for his low transient pulse technique for ultrasound imaging to detect and monitor bone fractures, and another for broadening the application base of the SmartPin, a new liquid ...

New discovery may enhance MRI scans, lead to portable MRI machines

... and one of the coauthors of the article. The solution to this mystery came as a result of their work in trying to optimize magnetic resonance pulse sequences. Specifically, they were looking for better ways of doing something known as an "inversion" in a magnetic resonance measurement. ...

Sowing a future for peas

... at critical times in the growing season, means lower yield and quality. This new information could be used to identify varieties of pea and other pulse crops that are more tolerant to changes in water availability. Drought stress also induced changes in compounds that could have an impact on ...

Improved technique determines structure in membrane proteins

... and easier, thanks to the work of researchers at the University of Illinois. By combining custom-built spectrometers, novel probe designs and faster pulse sequences, a team led by Illinois chemistry professor Chad Rienstra has developed unique capabilities for probing protein chemistry and structure ...

Story tips from the Department of Energy's Oak Ridge National Laboratory, June 2008

... gallium nitride-based devices. Key to the discovery is production of positively charged carriers -- p-type doping -- in zinc oxide using rapid pulse thermal processing. "LEDs require both p-type positively charged carriers -- and n-type -- negatively charged carriers -- materials in close ...

Environmental fate of nanoparticles depends on properties of water carrying them

... systems, Pennells research team filled glass columns with either glass microbeads or sand, and saturated the columns with water. They then sent a pulse of water containing C60 nanoparticles through the columns, followed by additional water containing no nanoparticles. They measured the quantity of ...

In computer models and observations, researchers see potential for significant 'red tide' season

... coast. Much of the Northeastern United States was hit with record- or above-average rain and snowfall this winter, which will provide an extra pulse of fresh water and nutrients into coastal waters this spring. The blend of nutrients and fresh water into salty sea water can improve growing ...

Argonne scientists develop techniques for creating molecular movies

... reacts to an outside stimulus. By using a laser to excite the atoms, he will create a movie that shows how the molecule reacts to the initial laser pulse and also how it returns to a stable condition. We hope to establish between good and bad molecular actors in important chemical processes like ...

Grand Canyon may be as old as dinosaurs, says new study

... through strata of the Mesozoic era dating from about 250 million to 65 million years ago, Wernicke said. From 28 million to 15 million years ago, a pulse of erosion deepened the already-formed canyon and also scoured surrounding plateaus, stripping off the Mesozoic strata to reveal the Paleozoic rocks ...

AGU Journal Highlights -- March 19, 2008

... an Earth system model to assess emission requirements for global temperature stabilization within the next several centuries. They find that a single pulse of carbon released into the atmosphere increases globally averaged surface temperature by an amount that remains approximately constant for several ...

Raydiance collaborates with Rutgers, MTF to develop innovative tissue processing approaches

... processing. In a first-of-its-kind test, world leading tissue engineers will utilize a new type of laser developed on the Raydiance Ultrashort pulse (USP) laser platform to maximize the transplants processed from donated dermal tissue. As part of this process, the collaboration will explore new ...

Fine-tuning lasers to destroy blood-borne diseases like AIDS

... in Arizona have undertaken experiments to show that the coherent vibrations excited by infrared lasers with carefully selected wavelengths and pulse widths do no damage to human cells, most likely because of the different structural compositions in the protein coats of human cells vis a vis ...

New insights into how lasers cut flesh

... different types of tissue can vary substantially. Therefore, different types of lasers work best in different medical procedures. For lasers with pulse lengths of a millionth of a second or less, there are two basic cutting regimes: Mid-infrared lasers with long wavelengths cut by burning. That ...

NMR researchers unlock hydrogen's secrets to spot polymorphism in pharmaceuticals

... The research team led by Dr Steven Brown from the University of Warwicks Department of Physics have exploited recent developments in NMR hardware and pulse sequence design allowing them to gain high-resolution 1H solid-state NMR spectra by a method called CRAMPS (combined rotation and multiple-pulse ...

October Geology and GSA Today media highlights

... rate unexpectedly declined in the Early and Late Classic periods as Maya population densities rose exponentially. Anselmetti et al. infer that a pulse of intense erosion accompanied initial land clearance in the Pre-Classic period when highly erodable soils were first exposed. These results suggest ...

Restoring sight, advances in fertility treatments and better visibility for pilots at FIO

... V has never been achieved before in a photonic material; photo-induced changes are usually more like a few percent. Researchers found that the laser pulse required doesn't even have to be particularly intense to cause the change. This "gigantic photoresponse" work began as a Tokyo Institute of ...
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