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WWW: Searching for Signs of Subsurface Life on Mars (Extinct and Extant) - Shared screen with speaker view
Bernadett Pál
29:14
I tried selecting my headset, there is no "phone audio" option
Bernadett Pál
29:17
Is it not better?
Bernadett Pál
29:29
I tried speaking, but maybe nobody heard me.
Jen Blank
30:26
Good morning, everyone!
Jen Blank
30:59
Hi Diana N!
Kereszturi Akos
32:02
Hi Everybody, I'm here but with my two children - so sometimes might be a bit away from my laptop.
Mary Sue Bell
33:59
Hi Guys,
Jen Blank
34:24
BRAILLE is coordinated through Blue Marble Space Institute of Science (Yay!) & NASA Ames Research Center
Penny Boston
35:48
Yay, Blue Marble!
Mary Sue Bell
37:45
This is gonna be my drive-time podcast so I'm just listening today.
Kennda Lynch
39:23
We are glad yo have you Mary Sue!!
Kennda Lynch
40:18
Everyone please let me know if you need an invite to slack
Kennda Lynch
40:48
Here is a link that should work - https://join.slack.com/t/marsunderground/shared_invite/enQtNjg0NzU1MzQ2MTMxLWMwN2FhYTYzNTAzNWIzMzkxMWE4NDczZDhmOWRkMTdkZWYzNGFmZjU1OTAyNWU5MWE1YzVmNDUyZmQ0MTNkYTg
Jen Blank
43:30
Nice job, Diana!
Penny Boston
44:05
Thanks Diana for jamming this in before you teach in a few minutes.
Mike Toillion
46:05
Presenters, please start your video during your presentation. I’ll send a little reminder to you before you begin.
tullisonstott
53:11
terrific
Penny Boston
53:26
Thanks TC
tullisonstott
53:36
presentation Diana!
Kennda Lynch
57:11
Everyone, please fill out the sign in form, even if you filled out the form in VM#1. We are “taking attendance: at each VM Session - https://forms.gle/sTEjei7ha4A3zmiE9
Jen Blank
57:23
check
Mike Toillion
57:31
Hi Jen P)
Mike Toillion
57:36
:)
Penny Boston
01:00:58
For me, the form link works on Chrome and Safari but not on Firefox, so if you are having issues, try another browser.
Jen Blank
01:04:39
Reimagine Viking. Great exercise!
Bernadett Pál
01:05:20
It says I am muted
Carol Stoker
01:07:12
How can this paper be in Nov 2019 which is in the future. Is this a typo?
Penny Boston
01:08:26
Don’t know Carol, I will check
Penny Boston
01:08:40
Maybe it’s an online preview?
Bernadett Pál
01:10:01
HI sorry, it was misleading, it is available online since july 12th, but it will be published in the november issue.
Brian Wade
01:10:13
The future date is correct, 15 November 2019.
Brian Wade
01:10:19
https://www-sciencedirect-com.proxy1.cl.msu.edu/science/article/pii/S0019103518305529
Bernadett Pál
01:10:37
Here is the link for the online version:https://authors.elsevier.com/a/1ZPhi4L-YR2pv
Brian Wade
01:10:50
Oops, sorry, that link is through a proxy.
Brian Wade
01:11:14
https://doi.org/10.1016/j.icarus.2019.07.007
Penny Boston
01:11:51
Yes, the Icarus november articles are already online.
Penny Boston
01:11:57
Thanks for the link Brian.
Brian Wade
01:12:04
You're welcome.
Jen Blank
01:14:51
perchlorates….encapsulate O2….
Kennda Lynch
01:19:52
This is not a bad thing. Since (per)chlorate reducers make oxygen, there could be some interesting implications for a potential microbial community….
Kennda Lynch
01:23:15
Slack Channel invite - https://join.slack.com/t/marsunderground/shared_invite/enQtNjg0NzU1MzQ2MTMxLWMwN2FhYTYzNTAzNWIzMzkxMWE4NDczZDhmOWRkMTdkZWYzNGFmZjU1OTAyNWU5MWE1YzVmNDUyZmQ0MTNkYTg
Jeff Osterhout
01:23:24
Are there different O2 limits for obligate vs facultative aerobes? i.e., can facultative aerobes tolerate lower concentrations than obligate?
Jeff Osterhout
01:24:07
That’s my gut response as well :)
Penny Boston
01:24:41
hahaha, I just BET it’s your gut response
Kennda Lynch
01:25:03
LOL
Jeff Osterhout
01:25:51
Ha! Makes sense — thanks
Jen Blank
01:30:53
Following on Heather’s question: yes, what’s the best way, currently, to determine metabolic activity in samples collected at depth? Compare (ratio) ATP and DNA concentration at depth and at surface? Other ways?
Carol Stoker
01:31:40
Can we get a reference or post TC’s review paper?
Kennda Lynch
01:31:50
https://forms.gle/sTEjei7ha4A3zmiE9
Brian Wade
01:31:50
A paper relevant to Martian perchlorate brines: https://doi.org/10.3389/fmicb.2017.02571
Penny Boston
01:32:25
We will give a link to TC’s paper on Slack asap.
vstamenk
01:32:52
AGU Session: New Mars Underground 2.0
matt
01:33:22
Jen, i think TC’s group has done some cool work with amino acid composition in deep biosphere samples that can serve as a proxy for activity too…
Jen Blank
01:33:30
Thanks all - interesting zoom call. I gotta go to my next meeting….!
Kennda Lynch
01:33:37
Questions to discuss in Slack (VM#1 Channel ) - What is the current evidence that extant life could exist on Mars?Did we explore the right places or collect the right data so far to be at all able to judge whether there could be extant life on Mars? Do we have enough data to think or are we still in the realm of “believing or not”?Is the subsurface the major or even only realistic target when exploring extant life on Mars? Alternatives for extant life?What do we know about the extent of liquid water on Mars?
Brian Wade
01:33:49
Onstott et al. 2018: https://doi.org/10.1089/ast.2018.1960
Jeff Osterhout
01:36:31
Also there’s a new paper in Astrobiology on life detection in deep ice, Eshelman et al. (2019)
Jeff Osterhout
01:36:42
Https://doi.org/10.1089/ast.2018.1925
Kennda Lynch
01:38:37
Everyone, Please make sure to vote in the general slack channel for what kind of document repository you would like to use. We will add all these papers that everyone is linking for people to find...
Kennda Lynch
01:39:29
Here is another perchlorate brines/life paper in salty environments - https://www.liebertpub.com/toc/ast/19/5
Brian Wade
01:39:51
Fingerprinting Non-Terran Biosignatures: https://doi.org/10.1089/ast.2017.1712
Alexandra Pontefract
01:42:39
Don’t forget chaotropicity!! Even if the water activity is high, if the Mg or ClO4 levels are too high, it may not be permissive for life.
Penny Boston
01:43:11
Indeed, chaotropicity makes things even trickier. I’m pretty sure I don’t understand it very well.
Kennda Lynch
01:43:18
Good Point….But there may be bugs that can deal with those high levels…
Kennda Lynch
01:43:21
I agree with Penny
Penny Boston
01:45:10
The minimal data so far doesn’t look good for high Mg etc. levels.
Penny Boston
01:45:46
But there is so little data
Brian Wade
01:45:55
Great meeting! Thanks!!
tullisonstott
01:46:00
thanks everyone so long
Penny Boston
01:46:10
Thanks everyone, I feel hopeful for the future of Mars astrobiology.
Jeff Osterhout
01:46:17
Thanks all!
Bernadett Pál
01:46:27
Thank you all!
vstamenk
01:46:30
Thank you all!