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Tag: "color" at biology news

Chemical compound inhibits tumor growth, size in new mouse study

...produces desirable changes, such as a golden brown color and toasty aroma, but also can sometimes cause off...produces desirable changes, such as a golden brown color and toasty aroma, but also can sometimes cause off-flavors or stale odors. The reaction not only pr...

Multiple genes permit closely related fish species to mix and match their color vision

...vered clues to understanding how the components of color vision can undergo change over a relatively short ...e cichlids offer a unique opportunity to study how color vision can undergo change in rapidly evolving species. For example, because color plays a significan...

Brain activity related to processing faces is similar in people with, without autism

...in black and white, fMRI offers digitally enhanced color images of brain function, depicting localized changes in blood flow and oxygenation. When particular regions of the brain increase their neural activity in association with various actions or thought processes, they emit enhanced blood oxygen level...

Portable cocaine sensor developed at UC Santa Barbara

... cocaine manufacturers add a chemical to block the color change. "Our sensor can detect cocaine no matter what they have cut it with: powdered sugar, flour, or the coffee that is sometimes used to mask the smell from dogs." At this point the new sensor detects cocaine in the blood or saliva to a degree of...

Newly identified mechanism helps explain why people of African descent are more vulnerable to TB

...her levels of melanin -- the pigment that provides color to skin absorbs UV light and reduces African Americans' ability to produce vitamin D. When the macrophages were stimulated by molecules of the tubercle bacillus that trigger Toll-like receptors, the research team found that cells cultured in serum pr...

Behavioral studies show UV contributes to marsupial color vision

...ce that marsupials, like primates, have functional color vision based on three different types of color photoreceptor cones--but unlike primates, a component of marsupial color vision includes sensitivity...

Sea coral's trick helps scientists tag proteins

...intense pulse of visible blue light. The dramatic color change "makes it possible to precisely label an object, such as a cell, organelle, or protein, with a flash of light and then to follow the object's movement over time," said Konstantin Lukyanov, whose group conducted the Dendra research in the lab o...

Cuttlefish masters of disguise despite colorblindness

... researchers tested cuttlefish (Sepia officinalis) color perception through observing the animal's behavior...eckerboard pattern when placed on substrates whose color intensities were matched to the Sepia visual system, suggesting that these checkerboards appeared to...

Lizard 'third eye' sheds light on evolution of color vision

...lex animals like humans. Although the blue-green color comparison method used by the parietal eye is not ...does reveal one potential step in the evolution of color vision, the Hopkins researchers say. Human light-reception cells responsible for color vision are c...

African amphibians make extreme parental sacrifice: The skin off their backs

...observations, coupled with the unusually pale skin color of mothers caring for young, led Nussbaum and colleagues to speculate that S. annulatus hatchlings fed on glandular secretions from the mother's skin, but the scientists never observed such behavior. In the current study, the team collected 21 B. ta...

The diversity of marine life in the Gulf of Maine region is much greater than previously thought

...es that give otherwise blue oceans (reflecting the color of the sky) their varying colors. Two of the microscopic plant species are of the genus Alexandrium and are the source of the paralytic shellfish poisoning known as "red tide." A major red tide swept the New England coast in 2005, shutting down t...

Poison dart frog mimics gain when birds learn to stay away

.... "A mimic species can actually become a different color pattern if it can enjoy the protection of the pred...reak down because predators would stop associating color patterns with toxicity.) If the mimics looked like the more toxic species, they might fall prey to ...

Study may help slay 'Yellow Monster'

...rade uranium ore is nicknamed "yellowcake" for its color and powdered consistency. The Navajo have another name: Leetso, or "yellow monster." The yellow monster surfaced on the Navajo Nation with uranium mining that started in the 1940s and continued for the next several decades. In its aftermath came ill...

Plastic surgeons countdown first full facial transplantation

... impossible to match the skin quality, texture and color of the face with any other tissue available on the...rgically match facial skin texture, pliability and color is through facial transplantation. "There is no doubt that facial transplantation can improve the ...

Major obesity gene is 'lost in the shuffle'

...n other physiological processes ?ranging from hair color determination to energy homeostasis. Mice that over-produce ASIP are extremely obese, exhibit symptoms of diabetes, and have yellow fur, while mice that lack the ASIP gene are black in color. The gene is widely expressed in tissues throughout t...

Iron critical to ocean productivity, carbon uptake

...wait to begin dividing and growing. But that green color wasn't an indication of health, it was an indication of stress from a lack of iron." The study is also important because it looked at the availability of iron throughout the tropical Pacific Ocean instead of small portions of it. Behrenfeld and his ...

MIT 'seeing machine' offers hope to blind

...w working toward a large-scale clinical trial of a color seeing machine (the device tested in the pilot trial was black and white). With the color version, participants can explore a museum gallery containing some of Goldring's art. When a person ...

UF scientists restore sight to chickens with blinding disease

... retinal diseases." Like people, chickens possess color vision and function best in daylight. The predominant photoreceptor cell type in the chicken retina, the cone cell, is the same cell type that is essential for normal human vision. To develop the treatment, UF scientists constructed a virus able to...

Study supports 'urgent' need for worldwide ban on lead-based paint

...etal previously used to improve the durability and color luster of paint used in homes and other buildings and on steel structures, such as bridges. Now scientifically linked to impaired intellectual and physical growth in children, lead is also found in some commonly imported consumer products, including ...

Snakes' virtual glasses, leopard spots and all-optical transistors

... surface of a metal. Varying the intensity and the color of the control beam causes the plasmons to interact in ways that enhance or decrease the transmission of the signal beam through the film. That is, the film acts as an all-optical transistor, with the potential to serve as a building block in optical...

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