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Tag: "visible" at biology news

Method slashes quantum dot costs by 80 percent

...f ultraviolet light and re-emit them as photons of visible light. They glow different colors, depending on the size, shifting from the red to the blue end of the spectrum as the crystals get smaller. The reproducible synthesis of high-quality quantum dots became a reality in the early 1990s when researcher...

Purdue's gold nanorods brighten future for medical imaging

...lying tissues. "One obstacle is that light in the visible spectrum does not pass through tissue very well," ... 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 inf...

The right drug at the right time

...f ultraviolet light and re-emit them as photons of visible light. They glow different colors, depending on the size, shifting from the red to the blue end of the spectrum as the crystals get smaller. The reproducible synthesis of high-quality quantum dots became a reality in the early 1990s when researcher...

Researchers use brain scans to predict behavior

...e moving dots were likely to appear. The dots were visible only for one-fifth of a second and therefore were easy to miss if a subject was not paying attention to the right area. After the hint and prior to the appearance of the moving dots, researchers scanned the volunteers with functional brain imaging,...

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

...frared light waves, which are slightly longer than visible rays of light and pass harmlessly through our cells," Dai says. But shine a beam of near-infrared light on a carbon nanotube, and the results are dramatic. Electrons in the nanotube become excited and begin releasing excess energy in the form of heat...

Protein behind autumn color splendor identified

...arth. There is so much of it, in fact, that it is visible from space--in satellite images of the earth the tropical and temperate forest areas are green. In the tropics there is no autumn, but in our climate deciduous trees and other perennials lose their chlorophyll in the fall. The reason for this is th...

Building a better mouse model of lung cancer: FHIT counts

...ppen later in the disease, when tumors are clearly visible and successful treatment unlikely," says Huebner. "We were interested in creating a model that reflected the timing and order of genetic and epigenetic changes in the human experience of this disease." Huebner and colleagues at Ohio State and Thomas...

New genetic test can detect clam disease

... test can now also be used to ensure clams without visible symptoms are not carrying the disease. With the disease spreading along the East Coast and no cure, the researchers say the best solution for shellfishermen and aquaculture operations is to keep infection levels as low as possible and try to keep see...

NRL scientists detect 'milky sea' phenomena

...sor capable of registering extremely low levels of visible light. This system has been used to detect terrestrial and atmospheric emission sources such as fires, lightning, and human activity (city lights, fishing boats, etc.) around the world. However, there have been no previous reports or demonstrations o...

Breath of the dragon: ERS-2 and Envisat reveal impact of economic growth on China's air quality

... Earth's atmosphere or surface in the ultraviolet, visible and near infrared regions. Mathematical inversion of these data yields the amounts and distribution of trace gases, ozone and related chemicals, clouds and dust particles throughout the atmosphere. With a 960-km swath and alternate limb and nadir obs...

Bacteria which sense the Earth's magnetic field

...d type with the MamJ mutants. She was able to make visible not only the magnetite crystal, but also the surrounding membrane vesicle, in a resolution never achieved before. Amazingly, the scientists saw a previously unknown filamentous structure along the magnetosome chain of the wild type cells. It resembl...

DNA self-assembly used to mass-produce patterned nanostructures

... bind to a protein molecule to give the tile a tag visible by AFM. Each arm of the cross, about 10 nanometers long, had a pair of "sticky ends" where the DNA strand was made of up of unpaired bases that tend to bind with reciprocal bases. Tiles with complementary sticky ends link together when mixed. The st...

Viagra's hidden help for wildlife

...r Western drugs, in that the effects are rapid and visible to the naked eye. "The fact is that prior to the commercial availability of Viagra in 1998, no product in any medical tradition had been proven to be an effective and non-intrusive treatment of erectile dysfunction. So despite their history of using...

Finding the mind's eye

...rarchy respond the same whether or not objects are visible to us or invisible in the context of visual masking." That is, some parts of the brain respond to visual stimuli regardless of whether the conscious mind "sees" them or not. However, Tse and his team found that, "neural activity in areas beyond visu...

New nanosensor uses quantum dots to detect DNA

...le, which in turn emits a fluorescent glow that is visible under a microscope. But quantum dots alone cannot find and identify DNA strands. For that, the Johns Hopkins team used two biological probes made of synthetic DNA. Each of these probes is a complement to the DNA sequence the researchers are searchin...

Powerful new tool for studying brain development

...h of four developmental stages. Gene expression is visible because special tags called probes bind to messenger RNA (mRNA)--the decoded form of the gene--and release a signal that can be seen using a special microscope. Gene expression refers to the production of mRNA, which becomes the blueprint the cell us...

Of mice, men, trees and the global carbon cycle

...e estimated globally from satellites, based on the visible plant cover. The plant cover indicates how much light the plants will intercept. Even harder to calculate are the global amounts of carbon dioxide released by living, respiring plants; the amounts released as plants are decomposed by microbes; and th...

Marine mammals are on the frontline of failing ocean health

...ferred from animals to humans. It's a measurable, visible impact. We're seeing new health threats in Alaska as a result of climate change." Warming temperatures are likely to increase rainfall in the North, leading to increased run-off to ocean systems and melting of ice. These changes affect how contami...

New hybrid virus provides targeted molecular imaging of cancer

...an important step in making human cancer both more visible and accessible to treatment; it may also allow prediction and monitoring of how specific anti-cancer agents are actually working. "In tumor-bearing mice, we show that this hybrid virus can target tumors systemically to deliver an imaging or therapeu...

Sea coral's trick helps scientists tag proteins

... to create a tiny fluorescent tag that responds to visible light. The two-color tag should help researchers f... when the tags are zapped with an intense pulse of visible blue light. The dramatic color change "makes it possible to precisely label an object, such as a ce...

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