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Offline Marlin

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Deinococcus radiodurans
« on: Jan 03, 2008, 03:41 »
Deinococcus radiodurans (Radiation resistant bacteria) can survive 100 times the radiation dose of other bacteria putting them in the realm of extremophile along with the bacteria that live in the high tempratures of hot springs.

Why are D. radiodurans more resistant to radiation that other bacteria. (Answer in a week if needed)

Offline Marlin

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Re: Deinococcus radiodurans
« Reply #1 on: Jan 03, 2008, 04:49 »
Because it copies and repairs its structure (like DNA) better than any other bacteria.

I don't need now stinking Biology Degree......hehehehe

Common sense. 

Tsk Tsk and why would that be? DNA for all lifeforms deviate by only a small fraction.

Rad Sponge

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Re: Deinococcus radiodurans
« Reply #2 on: Jan 03, 2008, 05:21 »
Actually Honey, you are on target.

From Wikipedia.org

"Deinococcus accomplishes its resistance to radiation by having multiple copies of its genome and rapid DNA repair mechanisms. It usually repairs breaks in its chromosomes within 12-24 hours through a 2-step process. First, D. radiodurans reconnects some chromosome fragments through a process called single-strand annealing. In the second step, a protein mends double-strand breaks through homologous recombination. As a consequence of its hardiness it has been nicknamed "Conan the Bacterium" (after Conan the Barbarian)."

http://en.wikipedia.org/wiki/Deinococcus_radiodurans

Offline Marlin

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Re: Deinococcus radiodurans
« Reply #3 on: Jan 03, 2008, 05:24 »
Actually Honey, you are on target.

From Wikipedia.org

"Deinococcus accomplishes its resistance to radiation by having multiple copies of its genome and rapid DNA repair mechanisms. It usually repairs breaks in its chromosomes within 12-24 hours through a 2-step process. First, D. radiodurans reconnects some chromosome fragments through a process called single-strand annealing. In the second step, a protein mends double-strand breaks through homologous recombination. As a consequence of its hardiness it has been nicknamed "Conan the Bacterium" (after Conan the Barbarian)."

http://en.wikipedia.org/wiki/Deinococcus_radiodurans



Yes that is the process common to all cells, what makes D radiodurans different.

Offline Marlin

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Re: Deinococcus radiodurans
« Reply #4 on: Jan 03, 2008, 05:29 »
They come after 'C radiodurans'...........(thats a joke Marlin ... because I haven't a clue)

You need Blue to help you find the clues (those with kids will get this reference).

McBride

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Re: Deinococcus radiodurans
« Reply #5 on: Jan 03, 2008, 06:33 »
Readers Digested version..

and I mean VERY digested version...

High levels of manganese and lower iron concentrations, while protecting the proteins, do NOT protect DNA.  DRs use Proteins in a unique way, so even though the DNA is taking a hit, the proteins are somewhat protected.  They are able to repair the DNA faster because the protein is not obliterated?

close?




Offline Marlin

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Re: Deinococcus radiodurans
« Reply #6 on: Jan 03, 2008, 06:49 »
Gold Star  :)

Resistant bacteria were found to have 300 times the concentration of magnesium and one third the concentration of iron than other bacteria. This seems to preserve the protein which is also radio sensitive and is required for DNA repair.

Offline Roll Tide

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Re: Deinococcus radiodurans
« Reply #7 on: Jan 04, 2008, 03:06 »
LOL Marlin I even know who Blues Clues is.......

But, I doubt he knows this one.  He's a 'Blue Dawg'.  Not a Bacteria.....


She   is the dog, and star of the show. Perhaps you are thinking of Steve?

(My teenagers can still remember the trauma of us singing "Have a Happy Birthday, Youuuu-uu, we'll have a great time too-ooo" to their youngest brother 10 years ago!)
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Offline Marlin

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Re: Deinococcus radiodurans
« Reply #8 on: Jan 04, 2008, 07:55 »
You guys are all wrong,....it's nakhlites!

Meteors???

 


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