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Water Flowing Through Ice Sheets Accelerates Warming, Could Speed Up Ice Flow, Says New Study

Environment

Melt water flowing through ice sheets via crevasses, fractures and large drains called moulins can carry warmth into ice sheet interiors, greatly accelerating the thermal response of an ice sheet to climate change, according to a new study involving the University of Colorado at Boulder.

The new study showed ice sheets like the Greenland Ice Sheet can respond to such warming on the order of decades rather than the centuries projected by conventional thermal models. Ice flows more readily as it warms, so a warming climate can increase ice flows on ice sheets much faster than previously thought, said the study authors. (more…)

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New 3-D Model of RNA ‘Core Domain’ of Enzyme Telomerase May Offer Clues to Cancer, Aging

Health, Science

A model representation of telomerase's RNA "core domain," determined by Juli Feigon, Qi Zhang and colleagues in Feigon's UCLA laboratory. Image credit: Juli Feigon, UCLA Chemistry and Biochemistry/PNAS

Telomerase is an enzyme that maintains the DNA at the ends of our chromosomes, known as telomeres. In the absence of telomerase activity, every time our cells divide, our telomeres get shorter. This is part of the natural aging process, as most cells in the human body do not have much active telomerase. Eventually, these DNA-containing telomeres, which act as protective caps at the ends of chromosomes, become so short that the cells die.

 

But in some cells, such as cancer cells, telomerase, which is composed of RNA and proteins, is highly active and adds telomere DNA, preventing telomere shortening and extending the life of the cell. 

UCLA biochemists have now produced a three-dimensional structural model of the RNA “core domain” of the telomerase enzyme. Because telomerase plays a surprisingly important role in cancer and aging, understanding its structure could lead to new approaches for treating disease, the researchers say.  (more…)

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The Genetics of Self-Incompatibility

Nature, Science

*Petunias show that the mechanisms behind inbreeding prevention are similar to immune response*

About the image: The female part of the petunia flower secretes an enzyme that is designed to deter pollen tube growth, thereby preventing fertilization. However, in the cases that the pollen has come from a genetically different plant, the pollen produces its own protein that combats the pistil’s enzyme. With the enzyme out of the way, the pollen tube can keep growing and fertilization can occur. Image credit: Zina Deretsky, National Science Foundation

Inbreeding is a bad strategy for any organism, producing weak and problematic offspring. So imagine the challenge of inbreeding prevention in a plant where male and female sexual organs grow right next to each other! Such is the genetic conundrum faced by the petunia. (more…)

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Scientists to Spy on People’s Dreams and Thoughts

Culture, General, Science

Image credit: Wikipedia

Until now it was believed that a person is unable to read the thoughts of fellow human beings. “Spying” on the dreams of another person appeared unrealistic. However, recent research by American scientists revealed that both these things are quite possible. Overly complex devices and paranormal abilities are not required to do so.

Recently, a respectable scientific journal Nature published an article that ten years ago would have been considered a fiction and would not have been publication at all. A group of American researchers led by Dr. Moran Cerf claims to have found a way to electronically records and decipher human dreams and thoughts. No complicated devices are required. The entire transcript can successfully go through an electroencephalograph – a device that for decades has been used by neuroscientists around the world. (more…)

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Yahoo! Launches Weekend Edition, a New Weekend Destination on Yahoo! News

Technology

*Sponsored by Buick, Weekend Edition offers content for the weekend audience, including an original video program*

SUNNYVALE, Calif.–(BUSINESS WIRE) — Yahoo! and Buick today unveiled Weekend Edition on Yahoo! News, a new weekend program offering compelling original video and relevant editorial content, programmed for the weekend audience. Weekend Edition (https://weekendedition.news.yahoo.com) will help Buick reach and engage the Yahoo! News audience of more than 90 million monthly visitors by integrating the Buick brand in a premium-content environment.

“With Weekend Edition, we’ve established a destination that features lighter lifestyle-oriented news programming, which we already know is more popular with our weekend audience,” said Mark Walker, vice president and head of Yahoo! News. “This program also aligns perfectly with Buick’s target demographics and brand attributes, which makes Buick an ideal partner for Weekend Edition.” (more…)

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Cosmic Curiosity Reveals Ghostly Glow of Dead Quasar

Science

The green Voorwerp in the foreground remains illuminated by light emitted up to 70,000 years ago by a quasar in the center of the background galaxy, which has since died out. Image credit: WIYN/William Keel/Anna Manning

While sorting through hundreds of galaxy images as part of the Galaxy Zoo citizen science project two years ago, Dutch schoolteacher and volunteer astronomer Hanny van Arkel stumbled upon a strange-looking object that baffled professional astronomers. Two years later, a team led by Yale University researchers has discovered that the unique object represents a snapshot in time that reveals surprising clues about the life cycle of black holes.

In a new study, the team has confirmed that the unusual object, known as Hanny’s Voorwerp (Hanny’s “object” in Dutch), is a large cloud of glowing gas illuminated by the light from a quasar-an extremely energetic galaxy with a supermassive black hole at its center. The twist, described online in the Astrophysical Journal Letters, is that the quasar lighting up the gas has since burned out almost entirely, even though the light it emitted in the past continues to travel through space, illuminating the gas cloud and producing a sort of “light echo” of the dead quasar. (more…)

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Better Weather: Water-vapor Profiling System Could Result in More Accurate, Less Costly Forecasting

Environment, Nature, Science

A vehicle from the National Severe Storms Laboratory observes conditions around a tornado in Wyoming during June of 2009. Image credit: Mike Coniglio, NOAA/NSSL

Researchers at the Georgia Institute of Technology and Bennett Aerospace are leveraging light detection and ranging (lidar) technology to develop a ground-based system that will automatically measure water vapor in the atmosphere. Known as”WaV-ProTM,” for Water Vapor Profiler, the system aims to provide more frequent data collection that could dramatically improve weather forecasting.

Initial work on the project began in mid-2009, when Bennett Aerospace, in collaboration with the Georgia Tech Research Institute (GTRI), won a Phase I Small Business Innovation Research grant from the National Oceanic and Atmospheric Administration (NOAA) to develop design requirements for the system. Recently, the researchers won a Phase II grant to build and test critical components needed for a final operating prototype of WaV-Pro. (more…)

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