Tag: "patches" at biology news

How trees changed the world

...80 million years (Ma) ago, the continents had only patches of mosses and algae with no tree cover. The effect of the evolution of trees (large vascular plants with deep, extensive roots) changed the world for ever, according to Dr Robert Berner (Yale University). He presents his findings at Earth Systems P...

Benefits from Alzheimer's plaque-producing reaction? Science study proposes role in gene expression

...ight bind to, the researchers borrowed velcro-like patches called binding domains from two other transcription molecules, known to activate genes that express fluorescent proteins. Binding domains only provide the physical link to a certain gene; they don't activate transcription by themselves. The researc...

Earliest human ancestors discovered in Ethiopia

...gion. "The new fossils come from the oldest of the patches of exposed sediment at Saitune Dora, Alayla, Aas Koma and Digiba Dora," White said. "These bones and teeth were difficult to find on surfaces that are littered with stones ranging from pebbles to boulders." The study of the Middle Awash has been ongo...

NASA helps conservation biologists get the big picture

...jects include: --using radar images to distinguish patches of natural forest from areas of cocoa planted under remnant canopy trees in Brazil's Atlantic coast rainforest. Compared to optical technology, radar has the advantage of penetrating both the cloud cover and tree canopy. Such work could help identify...

Arctic ecosystems being nibbled away

...undra's plant layer and only the smallest, wettest patches recovered on their own within 20-75 years. For instance, dry patches more than three feet across still had bare centers even after 20 years, largely due to wind erosion....

Excessive fishing prompted coastal ecosystems to collapse, but wise management now will help

...fic and East Coast oysters that are still found in patches and, if restored, would have a valuable impact on water quality and, simultaneously, create habitat for crabs, shrimp and fishes." Promoting further development of aquaculture growing and tending clams, oysters, scallops, and mussels also would have...

The skin's acid coating: SFVAMC researchers explain its origin and how it maintains skin integrity

...earchers used a hairless breed of mice and treated patches of their skin with a chemical that blocks the conv...fect on the skin's integrity, Fluhr said. Treated patches of skin were more susceptible to evaporation and drying than untreated skin, he said. Furthermore,...

A new model of cerebral cortex development

... a second touch area. We saw a identical array of patches that correspond on a one-to-one basis with the mouse's whiskers." (see illustration) The generation of a new cortical area by a molecular manipulation has not been seen before and may provide a clue about how the cerebral cortex changes in evolution....

Preventing rapid extinction of bighorn sheep

...ts that primary cause is actually that the habitat patches are too small. "Expensive management efforts to r...mary factor is habitat size and quality. The small patches in the study averaged 32 square miles, and the large patches averaged 61 square miles. Larger patche...

California gnatcatcher: Umbrella species failure?

...a species, Rubinoff surveyed 50 coastal sage scrub patches in San Diego County for three insects that depend ...esence of the California gnatcatcher. The smallest patches that had A. mormo, E. bernardino and H. electra were about 3, 5 and 26 acres, respectively. The patc...

MIT prof: Oceans at risk if policy tool not restricted

...developments have concluded that fertilizing large patches of ocean might therefore be profitable if carbon trading is instituted. "Proponents claim that ocean fertilization is an easily controlled, verifiable process that mimics Nature; and that it is an environmentally benign, long-term solution to atmosph...

Phase 3 psoriatic arthritis data for ENBREL (etanercept) announced at a national scientific meeting

...ppling along with inflamed and irritated scaly red patches of skin throughout the body. It is a progressive and debilitating disease and because there are no treatments specifically approved for psoriatic arthritis, doctors often use therapies approved for RA, including nonsteroidal anti-inflammatory drugs...

Oral administration of estrogen replacement therapy suppresses the biological actions of growth hormones in GH-deficient women

...ay oral estradiol valerate or transdermal estrogen patches delivering 100 g of 17estradiol daily for eight weeks. The subjects then crossed over to the alternate estrogen treatment for an additional eight weeks. The estrogen dosages used were based on data indicating equivalent biological activity, as measur...

Prescribed burning: Do we really know what we're doing?

... ofdifferent-aged patches. The idea was that young patches haveless fuel to support a fire, so they would help keep blazes fromspreading. The problem with this idea is that southern California'slarge fires are driven high "Santa Ana" winds and are not stopped byyoung chaparral patches, says Keeley. This view...

Gene therapy corrects sickle cell disease in mice, Science authors report

...in, in which the beta globin chains develop sticky patches when they lose their oxygen. These sticky patches cause the molecules to adhere to one another and link themselves into long fibers that stretch the r...

Fly cells on the move may reveal clues to cancer metastases

...entially lacks the gene of interest. "The knockout patches are large enough to reveal the effect of the missi...e double-abnormal cells divide, they create mutant patches in an otherwise normal animal. With the help of the mosaic flies, Silver discovered that polar cell...

URI oceanography models migration and foraging strategies of North Atlantic right whales

...ography. Kenney has estimated that zooplankton patches where right whales feed must reach concentrations ...the actual extent of such high-density zooplankton patches in the western North Atlantic is very poorly known, some of the highest densities have been measured...

Insect bites on plants reduce photosynthesis, imaging device shows

...learly recorded blue halos, representing damage to patches of cells surrounding the insect-caused holes, and varying levels of red fluorescence, denoting precise reductions in photosynthesis activity. They also found an almost 80-fold increase in the synthesis of furanocoumarins, a defensive chemical, sugge...

Fox Chase Cancer Center offers topical gel to treat precursor to skin cancer

...nnually. CTCL slowly progresses from scaling skin patches to larger areas of thickened plaques and then to tumor nodules. In the late stages, the cancer grows to involve lymph nodes, blood and internal organs and most patients die from infections due to breakdown of the skin and a crippled immune system. ...

Much ado about robins

...the Hooded Robin needs a number of 20 - 30 hectare patches of native woodland. There arent too many of these around any more, she says. The good news is that if there are Hooded Robins, then lots of other birds who are less sensitive to changes in their surroundings are also likely to be here. For the last t...

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