Tag: "black" at biology news

Perils on your plate

...e of nature's nastiesin the bread, onions, celery, black pepper and mushrooms that cause cancer or DNA mutations inrodents. The stuffing ingredients include acetaldehyde, a toxic breakdown product of alcoholic drinks,benzo[a]pyrene, a pot-ent carcinogen found in cigarette smoke, and ethyl carbamate, a natu...

Jefferson scientists use gene repair technique to change albino mice hairs to black

... they could change mouse melanocytes from white to black in the test tube. The scientists would like to continue to refine their technique. "We have a lot to improve on, such as oligonucleotide delivery to the melanocytes," says Dr. Yoon, who is also a member of the Jefferson Institute of Molecular Med...

Rapid size change in introduced fruit fly indicates it is evolving as it invades North America

...ations in Europe In the process, D. subobscura, a black fly less than one-eighth of an inch long, seems to be replacing native fruit flies in the Pacific Northwest. "Humans are introducing plants and animals all around the globe and, in many cases, those introductions are wreaking havoc on native populat...

Photoreceptor gene mutations cause degenerative eye disease

...hotoreceptors, called rods and cones. Rods mediate black and white vision and are used mainly at night. During the day, however, humans depend on cones for color vision. Cones come in three types – red, green, and blue – that are sensitive to different wavelengths of light. ESCS is a rare degene...

'Pathfinder' bees use optical odometers, suggesting microsurveillance technologies, Science author says

...hen the tunnel was adorned instead with horizontal black and white stripes, bees mainly performed round dances (86.7 percent), apparently because they were flying parallel with the lines, and therefore weren't receiving an exaggerated amount of optical input. Flying close to tunnel walls-particularly tho...

Prostate cancer test works as well for black men, study shows

...arly 75 percent of the prostate biopsies that both black and white men get are unnecessary," says Partin. A report on the study at Johns Hopkins and six other U.S. medical centers appears in the March issue of the journal Urology. The fPSA, a more sensitive test for cancer risk than the standard PSA test m...

A new way to engineer cells: The Staudinger ligation

...ineering cell chemistry. The cell is now less of a black box." "Cell Surface Engineering By a Modified Staundinger Reaction," by Eliana Saxon and Carolyn R. Bertozzi, appears in the 17 March 2000 issue of the journal Science....

Diversity of trees in forests may be caused by soil pathogens, IU biologists find

...ortality that we observed in a temperate tree, the black cherry -- high mortality close to the parent tree ...ern North America. Preliminary studies showed that black cherry seedlings experience high mortality in soil collected beneath black cherry adults, but low mo...

Researchers identify unique circadian rhythm photoreceptor

...ts the clock mechanism. But the system is almost a black box at present." According to Rosbash, applying findings about circadian photosensitivity in fruit flies to mammals is currently problematic because a mammalian circadian photoreceptor has not yet been identified. Mammalian cryptochrome molecules a...

Common spices protect bacteria during irradiation

...a say that some common spices -- red chili powder, black pepper and turmeric -- can actually prevent bacter...fered the highest level of protection, followed by black pepper and turmeric. Besides the unexpected finding of the spices' ability to shield bacteria from...

Cowbirds' winning songs reflect brainpower

...North, Central and South America, are medium-sized black birds, that, in some cases, such as shiny cowbirds, also have brown feathers. The birds' songs sweep a large range of frequencies, sounding "like a gargoyle, very bubbly, not very melodious -- like water dripping from a faucet," says Hauber. The re...

Success of introduced Argentine ants tied to reduced genetic variation

...st author of the study. The tiny dark-brown and black ants, which are about two millimeters in length, are thought to have entered the United States aboard ships carrying coffee or sugar from Argentina during the 1890s, then expanded throughout California and the southern parts of the United States. In...

To combat poaching, Florida officials use wildlife forensics

...nvolved alligator snapping turtle meat and Florida black bear meat. In yet another example, a Florida seafood dealer, suspicious that a large purchase of white fish fillets contained an illegal fish species, approached the researchers for help. They confirmed some fillets were indeed illegal. The lab also...

Ney honored for fish research

...of alewife with gizzard shad and striped bass with black basses. Over the years Ney has placed many graduate and undergraduate students from his classes in good jobs. His students have made a major impact throughout the U.S. They include fisheries biologists employed by the states of Kentucky, North Caroli...

Discovery shows how brain 'fills in blanks' to help us see

...ent backgrounds made up of visual "noise" -- gray, black and white pixels similar to the snow on a de-tuned television. The square shapes were either real, illusory, blocked or fragmented. Because the objects were difficult to see, sometimes they appeared fat or thin, depending on the background noise. (Th...

Bt corn variety found to be safe to Illinois butterfly

... Central Illinois in 1999 had no adverse effect on black swallowtail caterpillars that thrive in weeds alongside cornfields, according to both field and laboratory studies at the University of Illinois. The study -- published online Tuesday (June 6) by the Proceedings of the National Academy of Science --...

Breast is still best, though breast-fed infants may show initial slower weight gain

...months. The study sample consisted of 5594 white, black and Mexican-American infants, of whom 21% were exclusively breast-fed for 4 months, 10% partially breast-fed for 4 months, 24% breast-fed for less than 4 months, and 45% never breast-fed. Infants who were exclusively breast-fed for at least 4 months...

New research animals earn their stripes

...about 3 cm long that gets its name from prominent black and white stripes running along its body. Originating in India, the fish are now widely distributed across the world. Zebrafish have been studied by developmental researchers for more than 30 years, and they even have their own website where many d...

Faulty practices threaten condor program

... not, it may become a perpetual and very expensive black hole." California condors once could be found along the Pacific coast from Canada to Mexico. By the late 1970s, only about 30 birds remained. A captive flock was started in 1982, and free-flying birds were captured when it became clear that the wil...

UC Davis expert identifies oak-tree killer and warns public to use caution

...he found it in tissue samples from coast live oak, black oak and tanoak trees in an area from Big Sur to Sonoma County and southwestern Napa County. It has not been found in other oaks such as valley oak, blue oak and interior live oak. Black oaks are the most common oaks at middle to high elevations in th...

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