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DPS 2012 Titan abstracts
ngunn
post Sep 9 2012, 10:55 AM
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After a quick browse here's a few I picked out.

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d

Unfortunately the link for the Thursday session on Titan methane currently goes to a page about the banquet.
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Juramike
post Sep 9 2012, 12:18 PM
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QUOTE (ngunn @ Sep 9 2012, 06:55 AM) *
After a quick browse here's a few I picked out.

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d


G, that's really interesting!

[ smile.gif that pun is for all the biologists and chemists out there iin UMSF-land]


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exoplanet
post Sep 10 2012, 02:55 AM
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From someone with a Biology background . . . and reading those abstracts . . both Cytosine and Uracil are pyrimidines of RNA.
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ngunn
post Sep 11 2012, 06:42 PM
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QUOTE (ngunn @ Sep 9 2012, 11:55 AM) *
Unfortunately the link for the Thursday session on Titan methane currently goes to a page about the banquet.


That's still true from the main page, but following a slightly more indirect route does go to the Methane cycle abstracts and they're well worth a look.
http://www.psi.edu/dps12/block_links.pdf
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stevesliva
post Sep 11 2012, 08:07 PM
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QUOTE (exoplanet @ Sep 9 2012, 09:55 PM) *
both Cytosine and Uracil are pyrimidines of RNA.

I thought that was cool, too. Titan's own cryogenic Miller-Urey experiment.
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titanicrivers
post Sep 12 2012, 03:34 AM
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[quote name='ngunn' date='Sep 9 2012, 04:55 AM' post='190986']
After a quick browse here's a few I picked out.

http://www.abstractsonline.com/plan/ViewAb...725245476867%7d

Thanks for the link to the DPS2012 and the abstract by Lopes, Stofan et al on the possible volcanic structure (hot cross bun). Must be what Dr. Stofan had alluded to in the June video on the TIME mission (link here http://www.unmannedspaceflight.com/index.p...t&p=185707). I thought it was on the T84 flyby but it was actually on the T83 flyby on May 22.
Has anyone an image to view??
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Juramike
post Sep 12 2012, 11:57 AM
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HOOCCH2NH2 = glycine = Gly (three letter code) = G (single-letter code for amino acid protein sequences)

(forgot about the DNA overlap with "G" when I made the pun)


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stevesliva
post Sep 12 2012, 05:57 PM
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You did have me squinting for guanine.
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Mongo
post Sep 12 2012, 09:23 PM
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Seeing these abstracts made me want to check through previous DPS meetings. I found this one in the DPS 2010 Titan abstracts:

Possible Niches For Extant Life On Titan In Light Of The First Six Years Of Cassini/Huygens Results

QUOTE
At the 2005 DPS meeting we presented an assessment of the possibility of extant life on Titan after the first year of the Cassini mission at Saturn. We suggested then that hydrogenation of photochemically produced acetylene could provide metabolic energy for near-surface organisms and also replenish atmospheric methane (Schulze-Makuch and Grinspoon, 2005). In this talk we will offer a brief reassessment of the possibility of extant life in light of five more years of the Cassini/Huygens results, including the recent reports suggesting a lack of acetylene on the surface (Clark et al., 2010) and a possible sink of H2 at the surface (Strobel, 2010). Both results are consistent with earlier predictions for the existence of an acetylene-powered biosphere on Titan (Schulze-Makuch and Grinspoon, 2005; McKay and Smith, 2005), but can potentially be explained by more prosaic phenomena.


I would have thought that such a provocative paper would have garnered a lot of attention, but I do not recall ever hearing about this before. Was it considered too radical to be true? If so, how did it make it onto the main session of the evening, instead of being relegated to a poster session? Has there been any follow-up on this paper's predictions in the two years since it was presented?
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Astro0
post Sep 13 2012, 03:13 AM
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ADMIN NOTE:

A polite reminder about Forum Rule 1.3:
1.3 Astrobiology may not be discussed here, except in the narrow context of robotic space missions with stated astrobiological goals...

We appreciate that this is an interesting area of study but as we've seen before on UMSF, this is a door we do not want to go through.

Let's be really mindful please.

[/ADMIN]
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Juramike
post Sep 13 2012, 11:09 AM
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Glycine could come from cyanogen [formation route of cyanogen here]. (I'm not sure of the exact pathways or energy barriers, that'd be something to start digging up.).
NC-CN --> HOOCCH2NH2, is a formal aqueous hydrolysis (same oxidation state) of one of the nitriles, and a formal hydrogenation (reduction) of the other nitrile.
In the hydrogenation step, you've sucked up two equivalents of hydrogen gas (H2).

So if indeed there is glycine on the surface (how much?), it could help explain some of the H2 bookkeeping (by what exact chemical pathways? At what altitude in the atmosphere or surface?)


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Mongo
post Sep 13 2012, 07:20 PM
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QUOTE (Astro0 @ Sep 13 2012, 04:13 AM) *
A polite reminder about Forum Rule 1.3:
1.3 Astrobiology may not be discussed here, except in the narrow context of robotic space missions with stated astrobiological goals...

We appreciate that this is an interesting area of study but as we've seen before on UMSF, this is a door we do not want to go through.


D'oh! I had forgotten about that rule. Mea culpa.
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