Macros1980 wrote:Just watched the press conference. It sounds pretty exciting. Basically, based upon the evidence found in this research, the scope for finding extra-terrestrial life just got quite a bit bigger!

Some of the journalists who asked questions of the panel seemed pretty disguntled that the scientists didn't have ET up there on stage with them! One guy's question basically ammounted to "What do you have to say to all the people who thought you'd found an alien?"

Macros1980 wrote:Just watched the press conference. It sounds pretty exciting. Basically, based upon the evidence found in this research, the scope for finding extra-terrestrial life just got quite a bit bigger!

Some of the journalists who asked questions of the panel seemed pretty disguntled that the scientists didn't have ET up there on stage with them! One guy's question basically ammounted to "What do you have to say to all the people who thought you'd found an alien?"

Jain wrote:

Macros1980 wrote:Just watched the press conference. It sounds pretty exciting. Basically, based upon the evidence found in this research, the scope for finding extra-terrestrial life just got quite a bit bigger!

Some of the journalists who asked questions of the panel seemed pretty disguntled that the scientists didn't have ET up there on stage with them! One guy's question basically ammounted to "What do you have to say to all the people who thought you'd found an alien?"

Where can we find a link to the press conference?

NASA scientists have discovered an entirely new form of life that shares no biological building blocks with anything currently known on Earth, the agency said today.

In a press conference held at NASA's Washington D.C. headquarters, scientists announced that they had discovered a new form of bacteria, known as GFAJ-1, in California's Mono Lake that has DNA completely foreign to anything ever before found on Earth. It substitutes arsenic at the DNA level for phosphorus.

That would distinguish it from every other form of life known to man, all of which, no matter how diverse, is comprised of the same six elements, phosphorus, sulfur, carbon, hydrogen, oxygen, and nitrogen. But the bacteria found in Mono Lake--which is known for its unusual chemistry, including very high levels of salinity, alkalinity, and arsenic--is made partly of arsenic, and has no phosphorus in its DNA.

"We've discovered an organism that can substitute one element for another," said Felisa Wolfe-Simon, a NASA astrobiology research fellow at the U.S. Geological Survey in Menlo Park, Calif. "We've cracked open the door to what's possible for life elsewhere in the universe.

Although there had been speculation that NASA's announcement would revolve around life--perhaps bacteria--found elsewhere, such as Mars, the news does keep us here on Earth.

But Wolfe-Simon said that by discovering a microbe that has a new form of DNA, it forces scientists to question what they've long held as true--that all life was based on the same six components.

"The newly discovered microbe, strain GFAJ-1, is a member of a common group of bacteria, the Gammaproteobacteria," NASA wrote in a release. "In the laboratory, the researchers successfully grew microbes from the lake on a diet that was very lean on phosphorus, but included generous helpings of arsenic. When researchers removed the phosphorus and replaced it with arsenic, the microbes continued to grow. Subsequent analyses indicated that the arsenic was being used to produce the building blocks of new GFAJ-1 cells."

NASA feels that this discovery is important because it will help scientists with many areas of future research, such as the "study of Earth's evolution, organic chemistry, biogeochemical cycles, disease mitigation, and Earth system research. These findings also will open up new frontiers in microbiology and other areas of research."

Life is mostly composed of the elements carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Although these six elements make up nucleic acids, proteins, and lipids and thus the bulk of living matter, it is theoretically possible that some other elements in the periodic table could serve the same functions. Here, we describe a bacterium, strain GFAJ-1 of the Halomonadaceae, isolated from Mono Lake, California, which substitutes arsenic for phosphorus to sustain its growth. Our data show evidence for arsenate in macromolecules that normally contain phosphate, most notably nucleic acids and proteins. Exchange of one of the major bioelements may have profound evolutionary and geochemical significance.

Macros1980 wrote: "What do you have to say to all the people who thought you'd found an alien?"

Sityl wrote:I didn't see it clearly defined in the report whether this is the result of evolutionary change or a completely seperate abiogenesis. Does anyone know?

JQisAwesome wrote:Is it just me or this story a really, really big deal?