Page 10 of 12 FirstFirst ... 89101112 LastLast
Results 91 to 100 of 113

Thread: Nasa to make announcement about possible ET life find on Thursday

  1. #91
    Global Moderator
    Moderator

    Zyphlin's Avatar
    Join Date
    Jul 2005
    Location
    NoMoAuchie
    Last Seen
    @
    Gender
    Lean
    Independent
    Posts
    47,940

    Re: NASA Discovers New Life: Arsenic Bacteria With DNA Completely Alien To What We Kn

    Quote Originally Posted by marduc View Post
    They made it a point to stress right off the bat with the press release that the bacteria substituted arsenic for phosphorous in its DNA, it is not a new form of life it is an adaptation of existing life. It does still have profound implications though, since it illustrates that life can exist in conditions previously thought hostile to it.

    I want to find more info and a detailed written account of their findings, to find out when this substitution took place, was it in the lab or prior.. this is still unclear, and I do not have the time to spare atm to really dig deeply into it -if anyone can come up with details (not journalist interpretations please) that would be great.
    Ah, I see what you're saying. I didn't think substituded as in originally had and then swapped...but more talking that it used arsenic where most things used phosphorous. What you're saying would definitely be a bit different with regards to my reaction to it.

  2. #92
    Norville Rogers
    Kernel Sanders's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburgh, PA
    Last Seen
    07-23-12 @ 10:20 PM
    Gender
    Lean
    Undisclosed
    Posts
    3,730

    Re: NASA Discovers New Life: Arsenic Bacteria With DNA Completely Alien To What We Kn

    Quote Originally Posted by marduc View Post
    They made it a point to stress right off the bat with the press conference that the bacteria substituted arsenic for phosphorous in its DNA, it is not a new form of life it is an adaptation of existing life. It does still have profound implications though, since it illustrates that life can exist in conditions previously thought hostile to it.

    I want to find more info and a detailed written account of their findings, to find out when this substitution took place, was it in the lab or prior.. this is still unclear, and I do not have the time to spare atm to really dig deeply into it -if anyone can come up with details (not journalist interpretations please) that would be great.
    In the lab. Ars Technica has a good writeup.

    The researchers propose that, if an organism possesses an ability to overcome arsenate’s instability, it might be able to exchange phosphorus for arsenic in biological pathways. To test their hypothesis, they extracted GFAJ-1 from Mono Lake and subjected the bacteria to an artificial medium with increasing concentrations of arsenate and only trace amounts of phosphate.

    GFAJ-1 bacteria grew slower with arsenate than they would with phosphate, but they were still able to increase their cell count by 20-fold in six days. The cells ended up containing 0.19 percent arsenic by dry weight compared to just 0.001 percent in the control cells. More importantly, the cells grown in arsenate were noticeably different in morphology from the control population. They were 1.5 times bigger by volume and developed large vacuole-like regions inside the cells.

    Rather than just retaining arsenic inside the cells, the authors provided evidence that the bacteria actually integrated arsenic into DNA and possibly other biomolecules. They found higher arsenic and lower phosphorus content in purified genomic DNA of bacteria grown in arsenate compared to control cells.

    Synchrotron X-ray studies of intracellular arsenic revealed that it is mostly likely bound to four oxygen atoms and then distally bound to a carbon atom. This configuration is consistent with arsenic replacing phosphorus in the backbone DNA. Substitution of elements is known to occur in biological processes (e.g., copper in hemocyanin vs. iron in hemoglobin for oxygen transport), but it has not been seen in something as fundamental as the structure of DNA, nor has it been observed with arsenic.

  3. #93
    don't panic
    marduc's Avatar
    Join Date
    Oct 2008
    Last Seen
    10-22-17 @ 04:10 PM
    Gender
    Lean
    Other
    Posts
    5,301

    Re: NASA Discovers New Life: Arsenic Bacteria With DNA Completely Alien To What We Kn

    Quote Originally Posted by Kernel Sanders View Post
    In the lab. Ars Technica has a good writeup.
    that is what I was looking for, Thank you.
    Law Enforcement Against Prohibition
    Drugs are bad, prohibition is worse

  4. #94
    Liberal Fascist For Life!


    Redress's Avatar
    Join Date
    Mar 2008
    Location
    Georgia
    Last Seen
    Today @ 09:43 PM
    Lean
    Very Liberal
    Posts
    93,272
    Blog Entries
    2

    Re: Nasa to make announcement about possible ET life find on Thursday

    Moderator's Warning:
    Nasa to make announcement about possible ET  life find on ThursdayMerged the three threads, including the one in the Science section here to consolidate and reduce confusion. Sorry for the disruption, please carry on. Fascinating stuff.
    We became a great nation not because we are a nation of cynics. We became a great nation because we are a nation of believers - Lindsey Graham

    Quote Originally Posted by Fiddytree View Post
    Uh oh Megyn...your vagina witchcraft is about ready to be exposed.

  5. #95
    Dungeon Master
    Somewhere in Babylon
    Jetboogieman's Avatar
    Join Date
    Jan 2010
    Location
    Somewhere in Babylon...
    Last Seen
    @
    Lean
    Undisclosed
    Posts
    24,273
    Blog Entries
    1

    Re: NASA to announce "major discovery" that could boost chances of life on other worl

    I can already tell you whats going on.

    We are here, we are among you, we have been watching and we are not pleased.

    We will come from the sky, we will take over, your leaders will be punished, and those who have nothing, shall recieve everything, from money grabbing CEO's, to ruthless Rebel leaders and criminals, we know who you are, we know where you live, and when we come, you will feel our wrath.



    Be afraid, be very afraid.

  6. #96
    Cheese
    Aunt Spiker's Avatar
    Join Date
    Oct 2009
    Location
    Sasnakra
    Last Seen
    09-10-16 @ 06:10 AM
    Gender
    Lean
    Moderate
    Posts
    28,433

    Re: NASA to announce "major discovery" that could boost chances of life on other worl

    A screaming comes across the sky.
    It has happened before, but there is nothing to compare it to now.
    Pynchon - Gravity's Rainbow

  7. #97
    Banned
    Join Date
    Nov 2009
    Location
    Humble Texas
    Last Seen
    06-25-11 @ 05:28 PM
    Gender
    Lean
    Liberal
    Posts
    1,827

    Re: NASA to announce "major discovery" that could boost chances of life on other worl

    Also the fact, that they have made Arsenic-based life on earth could also be a indicator that life can evolve anywhere, and in any environment. Which means the possibility of life on other planets than earth has just tripled.


    This is a groundbreaking discovery, that I'm going all nerdy over.
    Last edited by RyrineaHaruno; 12-02-10 at 06:13 PM.

  8. #98
    Educator
    USViking's Avatar
    Join Date
    Dec 2009
    Location
    Greensboro NC USA
    Last Seen
    12-08-17 @ 11:29 PM
    Gender
    Lean
    Conservative
    Posts
    1,111

    Re: NASA to announce "major discovery" that could boost chances of life on other worl

    Quote Originally Posted by Kandahar View Post
    Here's the official press release from NASA:

    NASA - NASA-Funded Research Discovers Life Built With Toxic Chemical

    The article doesn't say anything about a second abiogenesis, (emphasis added- USV)
    Yes it does:

    (from article, paragraph 8, first sentence):

    The newly discovered microbe, strain GFAJ-1, is a member of a common group of bacteria, the Gammaproteobacteria




    Quote Originally Posted by Kandahar View Post
    In any case, it answers a long-standing question in astrobiology: Must ALL life necessarily be "life as we know it?" Today we have a definitive answer: No.
    Inaccurate.

    This bacteria is a part of life as we know it, that life being of common descent
    from one primordial organism, as we are.

    It just so happens that this one has relative immunity to arsenic. I wonder if
    bitter almonds were very much rarer than they are, and were discovered today,
    whether the cyanide tolerance of the plant might be considered as remarkable
    as the arsenic tolerance of this bug from Mono Lake.

  9. #99
    don't panic
    marduc's Avatar
    Join Date
    Oct 2008
    Last Seen
    10-22-17 @ 04:10 PM
    Gender
    Lean
    Other
    Posts
    5,301

    Re: NASA to announce "major discovery" that could boost chances of life on other worl

    Quote Originally Posted by USViking View Post

    It just so happens that this one has relative immunity to arsenic. I wonder if
    bitter almonds were very much rarer than they are, and were discovered today,
    whether the cyanide tolerance of the plant might be considered as remarkable
    as the arsenic tolerance of this bug from Mono Lake.
    If cyanide was incorporated in their DNA, yes to a lesser extent, however cyanide is made up of two elements that are already known to be common in lifeforms (carbon and nitrogen), and is actually produced by living organisms - you may as well be asking the same regarding digitoxin, or palytoxin, or any other organically produced compound that can be poisonous to some organisms.

    Arsenic is an element - not a chemical compound - this adds to the list of potential elements that can be core constituents of organic molecules (in this case DNA) - it does not say that certain compounds made of elements that are already known to be common to life can be tolerated, it adds a new element to the list of what to look for for life itself.

    And this is beyond it being relatively immune to arsenic, it is actually utilizing it in DNA in place of what was an essential element to all other observed lifeforms (phosphorous).

    edit: and yes digitoxin and palytoxin are much more complex than cyanide, but they are still compounds that are produced organically
    Last edited by marduc; 12-02-10 at 06:57 PM.
    Law Enforcement Against Prohibition
    Drugs are bad, prohibition is worse

  10. #100
    Banned
    Join Date
    Oct 2010
    Last Seen
    01-13-11 @ 10:48 PM
    Gender
    Lean
    Undisclosed
    Posts
    685

    Re: Nasa to make announcement about possible ET life find on Thursday

    It's Thursday, where's the press release?

Page 10 of 12 FirstFirst ... 89101112 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •