Tag: "beam" at biology news
Jefferson Lab experiment generates THz radiation 20,000 times brighter than anyone else
...erahertz radiation. Sending any energetic electron beam
through a magnetic field makes the beam
emit radiation, so-called synchrotron radiation, a process that is greatly enhanced (coherent synchr...
Single molecules observed
...he chip's holes is so tiny that light from a laser beam
is unable to pass through and instead is reflected by the microchip's aluminum surface, with some photons "leaking" a short distance into the hole, on the bottom of which an enzyme molecule is located. These few leaking photons are enough to illumina...
ORNL, Georgia's Isotron develop promising new cancer treatment
...al photon and gamma brachytherapy or with external beam
treatments. ORNL and Isotrons success is the result of many months of development and testing that began in 1999 with the signing of a three-year cooperative research and development agreement. After reducing the diameter of the source - the wire tha...
The human eye can self-correct some optical faults
...ulation, more precisely what the eye perceives. A beam
of harmless laser light shines through the eye's o... computes deviations from a perfectly formed light beam
or test pattern a short distance in front of the eye. Light rays exiting an optically perfect eye s...
Optical trap provides new insights into motor molecules - nature`s ultimate nanomachines
...individual kinesin molecules. ''Using an invisible beam
of infrared light, we can grasp and manipulate small things in the microscope, move them around at will and put forces on them,'' Block explained. ''The forces are very feeble, because they're associated with light pressure, but they're sufficiently ...
Australian overturns 15 years of nano-science doctrine
...sh that the simple cantilever design of a straight beam
proposed for the original atomic force microscope (Physical Review Letters, 1986) offers greatly improved performance over the V-shape while facilitating calibration and measurement interpretation. This finding has the potential to revolutionise the ...
First sightings of individual proteins as they fold
... enough to be fully lit by a tightly focused laser beam
(which is around 300 nanometers wide). They are attached to a clean glass surface, making their contents easy to view over long periods of time....
Scientists find evidence for crucial root in the history of plant evolution
...er grid and bombarding it with a brilliant focused beam
of X-rays in the "soft" range between 200-900 electron volts. Biological elements, such as carbon, nitrogen and oxygen, exhibit characteristic absorption in this unusual energy range, Cody says. This is the first time STXM has been used to study ar...
Laser micro-scalpel yields biological insights into tissue dynamics
DURHAM, N.C. -- Using a laser beam
scalpel so fine it could inscribe words on the sur...igned an optical and steering system for the laser beam
scalpel that was implemented and refined by graduate students Yoichiro Tokutake and Ming-Shien Chang...
Myosin V, the molecular motor, moves in monkey-bar motion
...fluorescent tag. The researchers then used a laser beam
to hit the tag, creating an electromagnetic field that could resolve the angle at which the molecule tilts. Using single-molecule fluorescence polarization, we could detect the three-dimensional orientation of myosin V tilting back and forth be...
Location of ulcerations in diabetic patients may be explained by blood flow
...tar surface of the foot was recorded using a laser beam
to scan the subjects they were lying prone. Scores measured highest skin perfusion to the lowest; plantar pressures scaled from highest to no pressure. Results In the absence of compression (subjects lying prone on a bed) images showed maximal e...
Engineers design new optical microprobe to detect subsurface organ abnormalities
...dly switches on and off and the mirror vibrates, a beam
of light from a fiberoptic cable is reflected onto...s laser-like "spatial coherence," meaning that its beam
remains more focused than normal light, it does not emit light of a single color frequency like comp...
Butterflies are flashers to attract mates
...see the direction in which the electric field of a beam
of light is oscillating. This direction of oscillation is called the polarization of light. One of the interesting things I noticed when I was studying this question is that all the iridescent forms seemed to be deep-forest species. And so I thought,...
Controlling cell adhesion: Researchers report first evidence of 'catch bonds'
... piconewtons comparable to the force exerted by a beam
of photons leaving a laser pointer. He measured bond lifetimes as short as a few thousandths of a second and as long as a few seconds. The second experiment involved flow chamber tests designed to simulate blood flow in the body. Oklahoma researche...
Automated imaging of brain tissue, high-quality glimpses inside arteries
...ul bursts of laser light. In their technique, the beam
is used at low power (where it does no damage) to provide 3D images (through various optical imaging techniques) of a tissue specimen's first layer. This layer is typically 100 microns deep, about the thickness of a human hair. After taking this firs...
3-D imaging inside living organism, using quantum dots
...onally localized since it is only occurring at the beam
focus. The scanning microscope moves the laser beam
across the area being imaged at a precise depth. When repeated scans at different planes of focus ar...
Insulin study sheds light on physics of crystal growth
...says. In a process called X-ray crystallography, a beam
of X-rays hits a crystallized molecule and then bends, or refracts, in a certain way as it travels through the crystal, creating a pattern as it exits. From those patterns, scientists can then determine the 3-D structure of complex biological molecul...
Drug that mimics vitamin D hormone may boost effectiveness of prostate cancer treatment
...ells. With the combination of Zemplar and external beam
radiation therapy, researchers were able to lower the radiation dose by 2.4 times and get the same results as when radiation was the sole treatment. "These results are very promising, but they must be duplicated in animal studies before being tested ...
Element 110 is named darmstadtium
... resulted from the fusion-evaporation using a 62Ni beam
on an isotopically enriched 208Pb target, which produced four chains of alpha-emitting nuclides following the presumed formation of 269110 + n. (S. Hofmann et al., Z. Phys. A350, 277-280 (1995)). bombardment of lead with nickel ions20882Pb + 6228Ni -...
Detoxifying sediments with electrons and UV light
...ms will need to be resolved. The scientists used a beam
at the University of Maryland for the recent studies. Electron beams and ultraviolet light remove chlorine ions (charged atoms) from PCBs, which reduces toxic-ity and enhances prospects for biodegradation of the remaining material by living organisms...
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