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Tag: "optical" at biology news

Envisat captures first image of Sargassum from space

... been detected from space for the first time using optical radiance data from the Medium Resolution Imaging S... ocean and better predict climate change. Using optical radiance data from the Medium Resolution Imaging Spectrometer (MERIS) aboard Envisat, Dr Jim Gower a...

Study shows lizard moms dress their children for success

...ed stripes to help them escape from predators (the optical effect of stripes on fast-moving prey makes them hard to catch). But the genes that control behavior and back pattern are not linked, so a lizard could end up with a mismatch that would leave it highly vulnerable to predators--wearing stripes and...

Catching cancer's spread by watching hemoglobin

...hat can potentially assist cancer diagnosis, a new optical technique provides high-resolution, three-dimensional images of blood vessels by taking advantage of the natural multiple-photon-absorbing properties of hemoglobin, the red-blood-cell molecule that carries oxygen throughout the bloodstream. The resea...

Danish researches solve virus puzzle

... Institute, University of Copenhagen has developed optical tweezers which can investigate and manipulate molecules at the nano-meter scale. Using a tightly focussed laserbeam this instrument can grab the ends of the RNA tether and follow the process of how the pseudoknot is mechanically unfolded. A cruc...

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

...al applications The most direct application of optical neuron control is to begin experimenting with neural circuits to determine why unhealthy ones fail and how healthy ones work. In patients with Parkinson's disease, for example, researchers have shown that electrical "deep brain stimulation" of cel...

Male reindeer inflate a large air sac in the neck region to emit their hoarse rutting calls

...air sac expands the neck region. Both acoustic and optical display serve to deter rival males and thereby prevent fighting, allowing to conserve energy. Simultaneously, the performance serves to attract female mating partners. Males vocalize almost exclusively during the autumn rutting season whereas fema...

Scientists create dual-modality microbeads to improve identification of disease biomarkers

... a technique to simultaneously or sequentially add optical and magnetic nanoparticles into the beads. Adding ...face. After the beads are removed from the liquid, optical imaging is used to determine the concentration of a specific protein or virus in the liquid sample b...

New sensor detects gaseous chemical weapon surrogates in 45 seconds

... or QCLs. LPAS is an exquisitely sensitive form of optical absorption spectroscopy, where a pulsed laser beam...ared wavelengths. Nearly every molecule has unique optical properties at infrared wavelengths between three and 12 micrometers, and QCLs provide access to any ...

Novel computed imaging technique uses blurry images to enhance view

... a novel computational image-forming technique for optical microscopy that can produce crisp, three-dimension...ric Synthetic Aperture Microscopy, ISAM can do for optical microscopy what magnetic resonance imaging did for nuclear magnetic resonance, and what computed tom...

MIT: Pulsing light silences overactive neurons

... new MIT research could lead to the development of optical brain prosthetics to control neurons, eliminating .... This new research opens up the possibility of an optical implant that could do the same thing, using light instead of electricity. The Media Lab neuroenginee...

Cancer cells forming blood vessels send their copper to the edge

...per and zinc. Overlaying these elemental maps onto optical images of the cells, Finney and her colleagues then correlated elemental content with cellular structures. "Our findings were very clear," said Finney. "We observed a dramatic relocalization of between 80 and 90 percent of cellular copper to the t...

Cells selectively absorb short nanotubes

...ronger than steel and possess superlative thermal, optical and electronic properties, but safety and biocompatibility remain an open question. "Published data citing in vitro (outside the body) toxicity are particularly inconsistent and widely disputed," writes biomaterials scientist Matthew Becker and h...

Gold nanoparticles prove to be hot stuff

... laser power, at the wavelength most often used in optical traps. Unless very low laser power is used, the heat could damage the molecules under study. Thus, gold beads would not be useful for temperature-sensitive experiments or applying force to molecules. But the heating effect could be useful in raising ...

Two nerve cells in direct contact

...ts in space create in humans and animals so-called optical flow fields which are characteristic for the movem...y. In the blow fly, the nerve cells that analyse optical flow fields, called tangential cells, are located in the lobula plate. There are only 60 of these ta...

A new approach to growing heart muscle

...'s made possible by a precise instrument called an optical force transducer that gives more precise readings than that used by other teams. The measurement showed that the BEHM that had formed in just four days after a million cells were layered on fibrin gel could contract with an active force of more th...

Powerful genome ID method extended to humans

... Zhou, co-authored the PNAS paper. The power of optical mapping lies in its ability to reveal the size and...ging large numbers of an organism's DNA molecules, optical mapping can produce a map of its genome at a relatively low cost. An optical map lacks the minute...

Climate experts search for answers in the oceans

...al payload is an ocean-monitoring altimeter and an optical and infrared radiometer, is scheduled for launch between 2011 and 2012 as part of the Global Monitoring for Environment and Security (GMES) service....

Detecting microalgae in coastal waters

...er space and time. In vogue are fluorescence-based optical monitors that 'see' chlorophyll a, a plant pigment that is present in all algal species. However, these tools are less effective in turbid coastal waters and do not identify alternative pigments, so cannot distinguish between different types of algal...

Chemical tests of cell growth enter third dimension

...l glows brighter than a 2D film, due to a specific optical effect, Yang said. The surrounding empty cells provide a darker background that lets the fluorescence signal be measured even more easily. "You can use this as a device to monitor a drug's effect, whether you want to stimulate or inhibit cell growt...

Quantum dots reviewed -- Could these nanoparticles hold the cure to cancer?

...uantum dots. These Quantum Dots (QDs) have unique optical and electronic properties that make them suitable for breakthrough treatments such as the detection and destruction of cancer cells. Just released on the nanotechnology website AZoNano, is a comprehensive review of the latest literature and studi...

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