Science & TechnologyS


Telescope

Out of the Blue - Group Searches for Evidence of Recurring Cometary Impacts

Faye Flam
The Philadelphia Inquirer
Mon, 07 Apr 2008 09:09 UTC
Magnified 25,000 times under Drexel University's scanning electron microscope, a couple of flecks of dirt offer up a landscape full of crags, valleys, ridges - and, to Dee Breger's eyes, a window back in time.

Microspherule
©Dee Breger
Colorized scanning electron micrograph shows a tiny spherule that is believed to have formed from a vaporized or melted fragment when a piece of a comet slammed into the Indian Ocean an estimated 4,800 years ago. Marine geophysicist Dallas Abbott hypothesizes that such an impact was the source of deluge legends like Noah's ark and Gilgamesh.
Read More...
Better Earth

Matrix-style virtual worlds 'a few years away'

Colin Barras
Newscientist
Thu, 03 Apr 2008 07:44 UTC
Are supercomputers on the verge of creating Matrix-style simulated realities? Michael McGuigan at Brookhaven National Laboratory in Upton, New York, thinks so. He says that virtual worlds realistic enough to be mistaken for the real thing are just a few years away.
Read More...
Telescope

Could a Wolf-Rayet Star Generate a Gamma Ray Burst?

Ian O'Neill
Astroengine.com
Sun, 06 Apr 2008 22:53 UTC
Gamma ray bursts (GRBs) are the most energetic events to be seen in the observable universe.

NASA
©NASA
Wolf-Rayet star
Read More...
Magnify

Nuclear scientists eye future landfall on a second 'island of stability'

Charmayne Marsh
American Chemical Society
Sun, 06 Apr 2008 22:30 UTC
Modern-day scientific Magellans and Columbus's, exploring the uncharted seas at the fringes of the Periodic Table of the Elements, have landed on one long-sought island - the fabled Island of Stability, home of a new genre of superheavy chemical elements sought for more than three decades.
Read More...
Magnify

DNA Building Block Creation Seen In Living Cells: Could Be Key To New Cancer Treatments


sciencedaily.com
Sun, 06 Apr 2008 19:52 UTC
Penn State scientists are the first to observe in living cells a key step in the creation of adenine and guanine, two of the four building blocks that comprise DNA. Also called purines, the two building blocks are essential for cell replication. The findings, which will be published in the 4 April 2008 issue of the journal Science, could lead to new cancer treatments that prevent cancer cells from replicating by interfering with their abilities to make purines.

DNA Building block
©Erin Sheets, Penn State
These cells, which were grown in the absence of purines, contain enzymes that are labeled with fluorescent proteins. The bright areas represent enzyme clusters.
Read More...
Telescope

Astronomers View Distant Galaxies Evolving One Billion Years After The Big Bang


sciencedaily.com
Sun, 06 Apr 2008 19:47 UTC
UK astronomers have produced the most sensitive infrared map of the distant Universe ever undertaken. Combining data over a period of three years, they have produced an image containing over 100,000 galaxies over an area four times the size of the full Moon. Some of the first results from this project will be presented by Dr. Sebastien Foucaud from the University of Nottingham on 4th April at the RAS National Astronomy Meeting in Belfast.

UKIDSS UDS field
©UDS, University of Nottingham
Zooming into a small fraction of the UKIDSS UDS field, the deepest infrared image ever obtained over such a large area. The zoom shows a relatively nearby spiral galaxy. Many of the faint red objects in the background are massive galaxies at distances of over 10 billion light years
Read More...
Ark

Flashback The Sculptures of the Parthenon, questions of authenticity and stewardship

William St. Clair
AHRS
Tue, 05 Dec 2000 11:41 UTC


Parthenon - c.pedia
©Unknown
The Parthenon seen from the hill of the Pnyx to the west.
Read More...
Crusader

Near-Earth Object Protection: NASA or Defense Department Mission?

Leonard David
Live Science
Fri, 04 Apr 2008 11:25 UTC
Keep an eye on a bill introduced in the House of Representatives by Congressman Dana Rohrabacher on Near Earth Objects (NEOs).

The NEO Preparedness Act calls upon the NASA Administrator to establish an Office of Potentially Hazardous Near-Earth Object Preparedness. That office would "prepare the United States for readiness to avoid and to mitigate collisions with potentially hazardous near-Earth objects in collaboration with other Agencies through the identification of situation- and decision-analysis factors and selection of procedures and systems."
Read More...
Clock

NYU dental professor discovers biological clock


International & American Association for Dental Research
Sat, 05 Apr 2008 11:22 UTC
Why do rats live faster and die younger than humans? A newly discovered biological clock provides tantalizing clues.

This clock, or biological rhythm, controls many metabolic functions and is based on the circadian rhythm, which is a roughly 24-hour cycle that is important in determining sleeping and feeding patterns, cell regeneration, and other biological processes in mammals.

The newly discovered rhythm, like the circadian rhythm, originates in the hypothalamus, a region of the brain that functions as the main control center for the autonomic nervous system. But unlike the circadian rhythm, this clock varies from one organism to another, operating on shorter time intervals for small mammals, and longer ones for larger animals. For example, rats have a one-day interval, chimpanzees six, and humans eight.
Read More...
Bulb

Meteorites delivered the 'seeds' of Earth's left-hand life


American Chemical Society
Sun, 06 Apr 2008 11:19 UTC
Flash back three or four billion years - Earth is a hot, dry and lifeless place. All is still. Without warning, a meteor slams into the desert plains at over ten thousand miles per hour. With it, this violent collision may have planted the chemical seeds of life on Earth.

Scientists presented evidence today that desert heat, a little water, and meteorite impacts may have been enough to cook up one of the first prerequisites for life: The dominance of "left-handed" amino acids, the building blocks of life on this planet.

In a report at the 235th national meeting of the American Chemical Society, Ronald Breslow, Ph.D., University Professor, Columbia University, and former ACS President, described how our amino acid signature came from outer space.

Image
©Los Alamos National Laboratory
A simulated ribosome (white and purple subunits) processing an amino acid (green).
Read More...