DPS 2012 Titan abstracts |
DPS 2012 Titan abstracts |
Sep 9 2012, 10:55 AM
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#1
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
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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Sep 9 2012, 12:18 PM
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#2
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
After a quick browse here's a few I picked out. http://www.abstractsonline.com/plan/ViewAb...725245476867%7d G, that's really interesting! [ that pun is for all the biologists and chemists out there iin UMSF-land] -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 10 2012, 02:55 AM
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#3
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Junior Member Group: Members Posts: 48 Joined: 19-February 05 Member No.: 171 |
From someone with a Biology background . . . and reading those abstracts . . both Cytosine and Uracil are pyrimidines of RNA.
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Sep 11 2012, 06:42 PM
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#4
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
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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Sep 11 2012, 08:07 PM
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#5
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
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Sep 12 2012, 03:34 AM
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#6
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
[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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Sep 12 2012, 11:57 AM
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#7
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
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) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 12 2012, 05:57 PM
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#8
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
You did have me squinting for guanine.
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Sep 12 2012, 09:23 PM
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#9
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
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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Sep 13 2012, 03:13 AM
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#10
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
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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Sep 13 2012, 11:09 AM
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#11
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
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?) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 13 2012, 07:20 PM
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#12
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
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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