NASA objavljuje prve dokaze o postojanju vanzemaljskog života?

[luba]

ovo je bilo pod embargom do pocetka presa:

Lurking in the depths of a California lake, researchers found a bacteria that can thrive on arsenic, an explosive discovery that could expand the search for other life on Earth and beyond. The NASA-funded study released Thursday redefines what science considers the necessary elements for life, currently viewed as carbon, hydrogen, nitrogen, oxygen, phosphorous and sulfur. Not only does the bacteria survive on arsenic, it also grows by incorporating the element into its DNA and cell membranes. "What is new here is arsenic is being used as a building block for the organism," explained Ariel Anbar, co-author of the study which appears in the online journal Science Express. "We have had this idea that life requires these six elements with no exceptions and here it turns out, well maybe there is an exception," he said. The discovery was made by Felisa Wolfe-Simon, a former postdoctoral scientist in Anbar's research group at Arizona State University's School of Earth and Space Exploration. NASA's vague announcement earlier this week of a press conference on "an astrobiology finding that will impact the search for evidence of extraterrestrial life" set the Internet abuzz with speculation. Astrobiology relates to the study of life in the universe, including its origin and evolution, where it is located and how it might survive in the future. But Anbar acknowledged it would be quite a leap to presume the next step is discovering alien life. "It is more the principle of the thing," he said. "Maybe there are other exceptions we should be thinking about. "We are very influenced by life as we know it and it gets very difficult to know, how far can we push that? How different can life be and still work?" A few years ago, Wolfe-Simon, Anbar and colleague Paul Davies began discussing the idea that different life forms could exist on Earth but by biological rules unlike ours, a notion known informally by scientists as "weird life." The trio published their 2009 hypothesis that arsenic, which is directly below phosphorous on the periodic table, could substitute for phosphorous in Earth life forms. "We not only hypothesized that biochemical systems analogous to those known today could utilize arsenate in the equivalent biological role as phosphate," said Wolfe-Simon. "But also that such organisms could have evolved on the ancient Earth and might persist in unusual environments today." Wolfe-Simon then went out into the field to test the theory, collaborating with Ronald Oremland, known as a world expert in arsenic microbiology, of the US Geological Survey. She scooped sediment from Mono Lake, known for its high levels of salt and arsenic, in eastern California and brought the material back to the lab. "She takes this sediment, puts it in a bottle essentially where there is lots of arsenic and very little phosphorous, and she does it over and over so only organisms that are going to be happy in that environment survive," said Anbar. Wolfe-Simon was able to get a bacteria known as strain GFAJ-1 of the Halomonadaceae family of Gamoproteobacteria to grow in the lab. "The organism came from nature," said Anbar. "It is a known bacteria. It is not a brand new bug but nobody realized it could do this." The discovery could open new avenues in disease research, and possibly new chapters in biology books, researchers said. "Sometimes you think something is not going to work, but then you go looking for it and sometimes you may find it," said Anbar. "And then you realize, oh, I didn't understand things quite as well as I thought I did before. And that happens all the time in science. That's part of what makes it fun."

[Аврам Гојић]

Jel ova asimpaticna kovrdzava riba vodila to istrazivanje? Jesam ja dobro razumeo da je ona samo "pretpostavila" kako je arsenik zamenio fosfor bez da zaista zna?

jesi, to ce sada da se izucava veoma dugo. jasno je da je to zateceno ali kako se desilo, to je daleko.

[Gonzo]

u osnovi vrlo logično, pretpostavka da život mora biti zasnovan na istim sačiniteljima kao na zemlji je pogrešna, uslovi okoline na drugim planetama dovode do toga da se život formira od drugih konstituenata.što će reć, male zelene možemo naći bilo gde

Edited December 2, 2010 by Gonzo

[Аврам Гојић]

u osnovi vrlo logično, pretpostavka da život mora biti zasnovan na istim sačiniteljima kao na zemlji je pogrešna, uslovi okoline na drugim planetama dovode do toga da se život formira od drugih konstituenata.

dabome. a ovo je sada ogroman proboj zato sto to potvrdjuje na terenu. jebote ne mogu da se opasuljim koliko je ovo dobro

[Shan Jan]

Uff izvinite me al meni se cini da se mala malo zaletela. Njen odgovor na prvo pitanje je bio u stilu "neam pojma dal je unutra i koliko dugo, samo smo videli da ubrzava hemijske reakcije..."Valjda je moj engleski isuvise los, meni ovo nista ne pije vodu da je ozbiljno istrazeno

[Shan Jan]

Cek, matora u odgovoru na drugo pitanje je rekla da "istrazuju sve mogucnosti sa arsenikom ne samo dnk kakav znamo"?

[Weenie Pooh]

Niste mi jasni, stvarno. Čovek lepo kaže:

"We have had this idea that life requires these six elements with no exceptions and here it turns out, well maybe there is an exception,""It is more the principle of the thing," he said. "Maybe there are other exceptions we should be thinking about."

Preconceptions are there to be challenged. Kakve ima veze što će udžbenici ponovo da se pišu? Nikakve. Pisali su se ponovo i kad su "oktrili" da Pluton nije planeta nego planetoid ili šta već...

[Shan Jan]

Resen problem biogoriva :D

[Buck Naked]

Jebote, je l' neki domaći medij preneo nešto o tome? <_<

[Gonzo]

Kakve ima veze što će udžbenici ponovo da se pišu? Nikakve. Pisali su se ponovo i kad su "oktrili" da Pluton nije planeta nego planetoid ili šta već...

pa ko ovde uopšte pravi problem s prepravljanjem udžbenika. prepravljaju se kad se dese velika otkrića, a ako se potvrdi ovo će svakako biti veliko otkriće. imaš problem što je nekima od nas to exciting?

[Shan Jan]

Gde su zene sa nauke kad nam najvise trebaju

[Weenie Pooh]

@Gonzo: Ne, imam problem samo s tim što se uporno tupi o alien life forms, i ovde i drugde. Jedna bakterija, poznata i prisutna na Zemlji, demonstrirala da može da inkorporira arcenik umesto fosfora - OK, fascinantno ljudima iz struke, ali ogroman skok se pravi od toga do "pa onda ćemo naći male zelene tamo ili ovamo." Da je ovo otkriće saopštila neka druga organizacija, ili da NASA nije dala nedelju-dve da se razvije hype o životu na Titanu ili Rei, niko ne bi ni pominjao vanzemaljce u ovoj priči.

[Gonzo]

Jebote, je l' neki domaći medij preneo nešto o tome? <_<

sjutra će, science news nisu na listi prioriteta. a i jedva čekam pokušaj da prosečnog gledaoca zainteresuju za to što je u dnka umesto fosfora nađen arsen.

[hattori]

pa ko ovde uopšte pravi problem s prepravljanjem udžbenika. prepravljaju se kad se dese velika otkrića, a ako se potvrdi ovo će svakako biti veliko otkriće. imaš problem što je nekima od nas to exciting?

pa da, samo treba da navataju neki organizam s druge planete i potvrde pretpostvake.prosto ko pasulj.:D

[Shan Jan]

Auuu sta je sad ovo? Vestacki su izbacili fosfor i ubacili arsenik u mulj laboratoriji? Znaci nisu nasli u prirodi.