[meteorite-list] Arsenic Bacteria Hoax

From: info at moonmarsrocks.com <info_at_meteoritecentral.com>
Date: Mon, 09 Jul 2012 13:33:41 -0700
Message-ID: <20120709133341.b86ea499b59be1b7298b47d2f1127a77.26e8fd7748.wbe_at_email13.secureserver.net>

Interesting article, Phil.

It's always good to see that given a little time, collaborative science
works things out. Having a couple Biology degrees myself, I would have
been floored if it had been verified that the bacteria substituted
arsenic for phosporus in its DNA. It will be interesting to see if they
determine in follow up studies what the actual mechanism is by which the
bacteria mitigates the presence of the arsenic in its environment. As
the article mentions, due to their relative simple makeup, some bacteria
have the ability to adapt and survive in very inhospitable Earth
enviroments. There have been some inklings of it (nanobacteria of Allan
Hills 84001), but someday I think we will likely see broadly agreed upon
hard evidence for them in many non-terrestrial environments.

Best,

Daniel

Daniel Noyes
Genuine Moon & Mars Meteorite Rocks
info at moonmarsrocks.com
www.moonmarsrocks.com

  ------------------------------

Message: 6
Date: Mon, 9 Jul 2012 00:06:11 -0400
From: "JoshuaTreeMuseum" <joshuatreemuseum at embarqmail.com>
Subject: [meteorite-list] Arsenic Bacteria Hoax
To: <meteorite-list at meteoritecentral.com>
Message-ID: <63BF6FFBB51F40319F12E314B7334D5E at ET>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Turns out it was a bogus publicity stunt:
http://www.washingtonpost.com/national/health-science/journal-retreats-from-controversial-arsenic-paper/2012/07/08/gJQAFQb7WW_story.html?hpid=z3

Journal retreats from controversial arsenic paper



By Marc Kaufman, Updated: Sunday, July 8, 10:05 PMThe Washington Post
Two new studies of controversial research on a bacterium found in
California's
arsenic-rich Mono Lake led the journal Science on Sunday to say that the

2010 paper it published on the microbe was incorrect in some of its
major
findings.
The original research, which also had been highlighted by NASA, reported

that the bacterium could live in an environment with very high arsenic
and
very low phosphorus - one of the six elements known to be present in all

living things. It consequently raised the possibility of life forms now
or
previously on Earth that break what had been accepted as a universal
rule of
biology.

But two new studies of the bacterium, GFAJ-1, reported that it could not

grow without the presence of phosphorus. The ?papers also challenged the

original finding that small amounts of arsenic compounds had replaced
phosphorus compounds in some DNA, membranes and other biologically
central
parts of the organism.
"Contrary to an original report, the new research clearly shows that the

bacterium, GFAJ-1, cannot substitute arsenic for phosphorus to survive,"
the
journal concluded in a formal statement.
"The new research shows that GFAJ-1 does not break the long-held rules
of
life, contrary to how [lead author Felisa] Wolfe-Simon had interpreted
her
group's data."
Nonetheless, Science wrote that it would look with interest at further
research regarding the bacterium, which it called "an extraordinarily
resistant organism that should be of interest for further study,
particularly related to arsenic-tolerance mechanisms."
Wolfe-Simon, now on a NASA fellowship at the Lawrence Berkeley National
Laboratory, is collaborating with senior scientist John A. Tainer on
wide-ranging studies of the bacterium. In an interview Saturday,
Wolfe-Simon
and Tainer said that they had produced tentative results in the Berkeley
lab
almost identical to the original results at a U.S. Geological Survey
laboratory, and that they were busy finishing the research and preparing

another paper.
Tainer said the two new studies in Science may have come to different
results than theirs because of the methodologies used, the precision
used to
detect arsenates and the provenance of the cells. He said the authors of
the
two new papers "may well regret some of their statements" in the future.
"There are many reasons not to find things - I don't find my keys some
mornings," he said. "That doesn't mean they don't exist. The absence of
a
finding is not definitive."
Wolfe-Simon and her numerous collaborators had made samples of GFAJ-1
broadly available after her initial results caused a storm of
controversy,
but she and Tainer said they may have been contaminated or modified in
transit.
She said that all the researchers agreed that the bacterium survived in
extraordinarily high levels of usually toxic arsenic compounds but that
they
disagreed about whether the organism used the arsenic compound to grow
and
whether it had incorporated the arsenic into its biology.
"I think it's unclear whether this is the last word," ?Wolfe-Simon said.

"They're not finding something that could be there in a minor amount."
One of the new studies in Science was conducted by a team centered at
Princeton University that included Rosemary Redfield of the University
of
British Columbia. She was one of the first and most vocal critics of the

original Wolfe-Simon paper, and she said Sunday she was satisfied with
how
the process has played out.
"A very flawed paper was published and received an inordinate amount of
publicity," she wrote in an e-mail. "But other researchers responded
very
quickly. .?.?. Now refutations of the work by two independent research
groups are appearing in the same high-profile journal, and the
refutations
are being well publicized. This is how science is supposed to work."
The new study Redfield was part of did not find any microbial growth
when
arsenates were provided to the bacteria without phosphates. Wolfe-Simon
had
initially reported that the bacterium grew when phosphorus compounds
were
withheld but arsenic compounds were provided. The new study also found
no
biologically mediated arsenic in the microbe's DNA, as ?Wolfe?Simon had
reported.
The paper concludes that the bacterium is an extreme life form but one
that
has adapted to its environment in a manner similar to many others that
live
in conditions long thought to be unsuitable for life.
The second new study in Science came from a research group in
Switzerland.
That group also found no growth in the bacteria in a medium with arsenic

compounds but no phosphorus. The paper suggested that Wolfe?Simon's
initial
finding may have missed the presence of extremely small amounts of
phosphorus in the arsenic medium, which then allowed the bacterium to
grow.
The paper reported that the GFAJ-1 bacteria survived in a culture that
had a
ratio of arsenate to phosphate of 10,000 to 1, while other known
arsenic-resistant microbes had ratios that were much lower. As a result,

they concluded, the bacteria was a good candidate for further study.

Phil Whitmer
Joshua Tree Earth & Space Museum
Received on Mon 09 Jul 2012 04:33:41 PM PDT