NASA’s World Revelation

NASA and Science magazine revealed, today, the discovery of a bacterium at a californian lake that can grow by using arsenic instead of phosphorus…What big deal!!! Is that the tremendous extraterrestrial life world revelation?

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.

Fonte:http://www.nasa.gov/topics/universe/features/astrobiology_toxic_chemical.html

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  1. Dezembro 3, 2010 às 0:15

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