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Tag: "colors" at biology news

ASU research shows connection between testosterone, dietary antioxidants and bird coloration

... often study what keeps sexual signals like bright colors or elaborate songs ‘honest,’ or why all individual...cals in birds and their relationship to the birds’ colors and health. “In the case of the zebra finch, the cost is in the pigments – having enough of them...

Study shows lizard moms dress their children for success

...h enclosure were experimentally varied, and throat colors of the males varied randomly. Lancaster tested eggs from each female's clutch for hormone levels and recorded the color patterns of the progeny before releasing them into the wild to see how well they survived. To avoid predators, the lizards need...

NASA predicts nongreen plants on other planets

...ough different atmospheres, researchers identified colors that would be most favorable for photosynthesis on...lanets. This new research narrows the range of colors that scientists would expect to see when photosynthesis is occurring on extrasolar planets. Each pla...

The price of vanity: Mating with showy males may reduce offspring's ability to fight off pathogens

...ith males who possess showy traits ?such as bright colors or long tails and fins ?results in higher testosterone levels in males over many generations. Because male and female testosterone levels are correlated, female choice also results in an increase in female testosterone levels. Testosterone is an ...

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

...and Sathe synthesize the quantum dots in different colors by varying their size, giving the beads a unique optical signature. Having different color beads allows the researchers to detect several target molecules at the same time in the same liquid sample. "We use the quantum dots to create a set of bead...

The influence of the menstrual cycle on the female brain

...tal cortex. (The higher the T values, the more the colors go from red to yellow, and the "statistically" higher the brain activity.) Estrogens and progesterone are not just sex hormones that influence ovulation and reproduction; they also affect a large number of cognitive and affective functions. Th...

Human preference for other species could determine whether they survive

...ppear to be the ones that display markings of warm colors such as red, orange or intense yellow, said David ...most popular are the ones that display the warmest colors in the upper body, the neck and head. He likened the effect to that of a man in a tuxedo pinning on ...

How the brain weaves a memory

...canned, the subjects were shown words of different colors and that were located in different quadrants of the display screen. Later, the subjects were presented a collection of words including both the study words and new words. They were asked to recall whether the words were old or new, and for the old ...

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

...nderwent an fMRI scan. The words were in different colors and would appear in one of four quadrants on a screen. The subjects had to decide whether the words represented an animate or inanimate object. Later, the participants were presented the words again, interspersed with words they had not seen before, ...

Three-dimensional, miniature endoscope opens new diagnostic possibilities

...size of a human hair ?is broken into its component colors and projected onto tissue, with each color illumin...back is recorded, and the intensity of the various colors decoded by a spectrometer, which analyzes the wavelengths of light. Another device called an interfe...

Blue eyes -- A clue to paternity

...f 443 young adults of both sexes and different eye colors were asked to report the eye color of their romantic partners. Blue-eyed men were the group with the largest proportion of partners of the same eye color. According to Bruno Laeng and colleagues, "It is remarkable that blue-eyed men showed such a...

Zebra finch males prefer females with exaggerated maternal traits

...y were tested with females with a spectrum of beak colors ranging from extreme orange to extreme red. Males in both groups preferred females with beaks that were more extremely colored than their mothers' beaks. This "peak shift" effect is known from other learning processes in which animals learn to distin...

Orange, grapefruit juice for breakfast builds bones in rats

...In general, people should eat a variety of all the colors (in food) to get all of the beneficial compounds," Patil added. "And eat fresh." ...

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

...team analyzed 80 consumer paint samples of various colors and brands from four countries--India, Malaysia, China and Singapore--to determine the amount of lead and compare them with U.S. standards. Each paint sample was applied in a single layer to a wood block, left to dry and then removed and analyzed i...

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

...gments allows the cell to respond to two different colors of light and process that information within the same cell. According to the researchers, when the lizard's third eye sees blue light, the blue pigment triggers a molecule called gustducin, which is very similar to a molecule found in human photore...

Cuttlefish masters of disguise despite colorblindness

...es of checkerboard patterned substrates of various colors and brightnesses. They found that the animals did not respond to the checkerboard pattern when placed on substrates whose color intensities were matched to the Sepia visual system, suggesting that these checkerboards appeared to their eyes as unifor...

Deep treasure to be found in Oculina Bank

...p. This will allow scientists to associate certain colors and other map features with the type of habitat they indicate, such as sand bottom, coral ledges, or coral rubble, allowing more accurate assessment of the extent of the reefs and likely identification of previously unknown coral features. "Under...

Sudden change in social status triggers genetic response in male fish, study finds

...ing brain cells decrease in size, the ostentatious colors and stripes disappear, and the testes shrink and the male becomes infertile. "Previously we did an experiment in which we moved the subordinate male out of the tank and put him in a situation where he could rise and become dominant," Fernald say...

Protein behind autumn color splendor identified

...ow and red pigments that bring us the explosion of colors we now have in store. A research team at Ume's Plant Science Center (UPSC) has now identified a protein that helps bring out the color splendor of plants in the fall. The research team's findings are being published in the scientific journal PNAS, ...

Female butterflies go for sparkle -- not size -- when choosing to mate

...n the context of the natural world, where dramatic colors and physical features often win the sexual-selection game, according to the UB researchers. "This is one of the first studies to show that such a small pattern element really matters in female choice," said Antonia Monteiro, Ph.D. a co-author on the...

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