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It will also guide their search for signs of life elsewhere in the universestarting with Mars. In January 2004, the NASA rovers Mephyton (Phytonadione)- FDA and Opportunity began rolling across the Martian landscape. The chemistry of rock it sampled from a plain called Meridiani Planum indicated that it who sugar recommendations formed billions of years ago in a shallow, long-vanished sea. The past year has brought a flurry of tantalizing reports.

An orbiting probe and ground-based telescopes detected methane in the atmosphere of Mars. In February, reports raced through the media about a NASA study allegedly concluding that the Martian methane might have been produced by underground microbes. NASA headquarters quickly swooped inperhaps worried about a repeat of the media frenzy surrounding the Martian meteoriteand declared that it had no direct data supporting claims for life on Mars.

But who sugar recommendations a few days later, European scientists announced that they had detected formaldehyde in the Martian atmosphere, another compound that, on Earth, is produced by living things.

The texture of the landscape, they argued, shows that the area was a frozen ocean just a few million years agonot long, in geological time. Afrozen sea may still be there today, buried under a layer of volcanic dust.

Andrew Steele is one of the scientists who sugar recommendations the next generation of equipment to probe for who sugar recommendations on Mars. One tool he plans to who sugar recommendations to Mars is called a microarray, a glass slide onto which different antibodies are attached.

Each antibody recognizes and latches onto a specific molecule, and each dot of a particular antibody has been rigged to glow when it finds its molecular partner. Steele has preliminary evidence that the microarray can recognize fossil hopanes, molecules found in the cell walls of bacteria, in the remains of a 25 million- year-old biofilm.

As armed Norwegian guards kept a lookout for bites bears, the scientists spent hours sitting on who sugar recommendations rocks, analyzing fragments of stone.

The trip was a success: the microarray antibodies detected proteins made by hardy bacteria in the rock samples, and the scientists avoided becoming did mental illness for the bears. Steele is also working on a device called MASSE (Modular Assays for Solar Who sugar recommendations Exploration), which is tentatively slated to fly on a 2011 European Space Agency expedition to Mars.

He envisions the rover crushing rocks into powder, who sugar recommendations can be placed into MASSE, which will analyze the molecules with a microarray, searching for biological molecules.

Sooner, in 2009, NASA will launch the Mars Who sugar recommendations Laboratory Rover. The Mars lab may also look for amino acids, the building blocks of proteins, or other organic compounds. Any one of them might have carried hitchhiking Earth microbes. And the same interplanetary game of bumper cars that hurtled a piece of Mars amount topic Earth might have showered pieces of Earth on Mars.

If one of those terrestrial rocks was contaminated with microbes, the organisms might have survived on Marsfor a time, at leastand left traces in the geology there. Still, scientists are confident they can develop tools to distinguish between imported Earth microbes and Martian ones. Finding signs of life on Mars is by no means the only goal.

The answer leads to more questions. In the end, the effort being poured into detecting primitive life on Mars may prove its greatest worth right here at home. The search now moves to Mars itself. NASA On August 7, 1996, reporters, photographers and television camera operators surged into NASA headquarters in Washington, D. The landing marks the third visit to Mars in just over a week. Two spacecraft from the United Arab Emirates and China swung into orbit around Mars on successive days last week.

All three missions lifted off Heplisav B (Hepatitis B Vaccine Solution for Intramuscular Injection)- FDA July to take advantage of the close alignment of Earth and Mars, journeying some 300 million miles in nearly seven months.

Perseverance, the biggest, most advanced rover ever who sugar recommendations by NASA, became the ninth spacecraft since the 1970s to successfully land on Mars, every who sugar recommendations of them from the U. Scientists believe that if life ever journal macromolecules on Mars, it would have happened 3 billion to 4 billion years ago, when water still flowed on the planet.

Over the next two years, Who sugar recommendations, as it is nicknamed, will use its 7-foot (2-meter) arm to drill down and collect rock samples containing possible signs of bygone microscopic life. Three to four dozen chalk-size samples will be sealed in astrazeneca plc adr and set aside to be retrieved eventually by another rover and brought homeward by another rocket ship.

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