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Tag: "color" at biology news

Loosen up, DNA: Leukemia gene changes genetic packaging

...d clearly ?in red and white. By looking at the eye color of a variety of mutant flies, the team at the Univ... regions. The team used the gene that controls eye color to check whether a given stretch of DNA was on or not. If the fly's eyes were red, the gene was turn...

Female guppies risk their lives to avoid too much male attention

...esearchers show that female guppies might use this color difference to their advantage, venturing into the deep water where predators lurk. The males' bright coloring also attracts predators, making it too dangerous for them to follow. "Understanding why and how [sexual segregation] occurs is essential i...

Quick -- what’s that smell?

...onal neuroscientist, comments, "The development of color television was based on extensive studies of visual sensory processing. Modern MP3 players are built based on a deep knowledge about properties of our hearing capabilities. Similarly, increased knowledge of olfactory processing has the obvious potent...

Species unique to tidal marshes face threats

...ved to be an advantage because it matches the dark color of the soils often found in tidal marshes. Why endemic tidal marsh species seem to be largely restricted to North America--which has 24 of the worldwide total of 25--is not clear. Although it could reflect differing taxonomic practices in different c...

Biological motors sort molecules one by one on a chip

...irection of the electrical force, depending on the color of the microtubule, the Delft researchers were able to collect the green and red microtubules in different reservoirs. With their approach to the nano-channels, the researchers killed two birds with one stone. In addition to the possibility of ste...

Zebra finch males prefer females with exaggerated maternal traits

...e group of males, the researchers painted the beak color of the mother orange and that of the father red; for another group, the mother got a red beak and the father an orange one. When the males reached adulthood, they were tested with females with a spectrum of beak colors ranging from extreme orange to ...

Electric fish in Africa could be example of evolution in action

...cies. "This could be just a polymorphism, like eye color in humans, that violates the fishes' general evolutionary pattern but doesn't give rise to separate species," said Arnegard, who will return to Gabon in June to conduct further tests, funded by the National Geographic Society. ...

Light-sensitive photoswitches could restore sight to those with macular degeneration

...ich complements the SPARK channel because the same color of light will turn one on while turning the other off. "Now we have photochemical tools for an on switch and an off switch for nerve cells," Kramer said. "This will allow us to simulate the natural activity of the healthy retina, which has on cells...

Master planners in brain may coordinate other areas' roles in cognitive tasks

... associated with the word "dog" or determining the color of the letters in the word "dog." Much of the human brain's power derives from what Petersen calls "flexible configuration of processing systems," or the ability to take one stimulus and process it in different ways to produce different feedback. D...

Mother birds give a nutritional leg up to chicks with unattractive fathers

...inches display nutrition-linked plumage ranging in color from bright red to drab yellow. The researchers found that eggs sired by unattractive males (those with less brilliant feathers) had more total antioxidants, including 2.5 times the vitamin E levels, than eggs sired by males with redder, more saturat...

Study offers window into human behavior, brain disease

...s not like analyzing movement of your right arm or color vision. We're talking about understanding how we read others' minds. The philosopher in me sees the opportunity to really learn something interesting about human nature, here." Still, he says, "It's the neurologist in me that brings me to work ever...

Blue eyes -- A clue to paternity

...om the University of Tromso, Norway, the human eye color reflects a simple, predictable and reliable geneti...on eye color. The laws of genetics state that eye color is inherited as follows: If both parents have blue eyes, the children will have blue eyes. If...

New technology used to construct the first map of structural variation in the human genome

...arkinson's, susceptibility to HIV-1, some forms of color blindness, and many other diseases. They lead to variation in gene expression levels and may account for a large amount of phenotypic variation among individuals and ethnic populations, including differential responses to drugs and environmental sti...

Emotional control circuit of brain's fear response discovered

...dard Stroop test asks participants to name the ink color of a printed color word. Performance is typically worse if word and color are incongruent (e.g., YELLOW printed in red...

Three-dimensional, miniature endoscope opens new diagnostic possibilities

...ponent colors and projected onto tissue, with each color illuminating a different part of the tissue surface. The light reflected back is recorded, and the intensity of the various colors decoded by a spectrometer, which analyzes the wavelengths of light. Another device called an interferometer, which cal...

Psst! Coffee drinkers: Fruit flies have something to tell you about caffeine

...ipped the flies onto their backs and looked at the color of their bellies to see what they ate - blue indicating a preference for eating sugar, red indicating a preference for bitter caffeine, and purple indicating no preference. Flies missing the critical taste receptor protein Gr66a consumed the bitter ...

LSU professor discovers new species

...ilippines, in several distinct ways: different color patterns; its structure, or morphology; differences in scale count, which is one of the basic ways scientists distinguish between species; and significant genetic variations. These traits combined to confirm the original hypothesis that...

Shrinking ponds signal warmer, dryer Alaska

...black and white aerial photographs from the 1950s, color infrared aerial photographs from 1978-1982, and digital images from the Landsat satellite from 1999-2002, Riordan outlined each pond by hand. "With automated classification your accuracy goes down," Riordan said. Cloud shadows can look like water and...

Biodegradable napkin -- featuring sensitive nanofibers -- may quickly detect biohazards

...hazards and chemicals and would signal by changing color or through another effect when the antibodies atta...er colleagues are still working on ways, such as a color change, for the fabric to signal that it has identified the contaminant. "We're probably still a fe...

Memories: It's all in the packaging, scientists say

...e. They were also asked if they remembered in what color the word had originally been and in which of the f...ed. If the participant could later remember the color of the word, a particular area of the brain associated with color processing was especially active d...

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