Robert J. Mitchell
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  • Mesa, AZ
  • United States
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Robert J. Mitchell posted a blog post

Life as a Carnot Cycle (Blog 2)

For at least the last few meetings we have discussed the idea of LUCA. A name for the evidence that suggests that all life, bacterial, archaeal, and eucaryal, all formed from a common organism. Woese suggests that LUCA, or the root of the universal phylogenetic tree, could not have equivalent metabolically to "modern cells." In his paper, Woese seems to dismiss the idea of a metabolism-first world instead providing evidence for horizontal gene transfer (HGT) in an RNA-first world. While without…See More
Feb 5
Robert J. Mitchell replied to Michael Oals's discussion Seeding life and taking the next step in the group SES 311:Essentials of Astrobiology
"If we could cultivate other planets, should we? What about mine them? What will stop such activities once the economics of them are there. We spoke briefly in class about replicators. It was suggested that eventually, the conditions in the…"
Jan 26
Robert J. Mitchell replied to Andrei Barney's discussion FERMI in the group SES 311:Essentials of Astrobiology
"Thank you for writing this. The name, Fermi, has been mentioned only a couple of times in class. Those couple of time were the only times I'd ever heard it. We are the only sample we know, so far, in the universe. As discussed in class, it was…"
Jan 26
Robert J. Mitchell liked Andrei Barney's discussion FERMI
Jan 26
Hunter Ramos replied to Robert J. Mitchell's discussion Is life that rare or are we just selfish in the group SES 311:Essentials of Astrobiology
"I like the idea of expanding our idea of what life is. Since we only one sample size of what life is there are other possibilities to forms of life. That being said connecting life to the first law of thermodynamics seems like bridging gap…"
Jan 25
Jordane Raub replied to Robert J. Mitchell's discussion Is life that rare or are we just selfish in the group SES 311:Essentials of Astrobiology
"I like how you brought up pop culture. I think it helped your argument a lot and I also helped me to understand your point better. The concept of 100 percent access to brain power as being the next step in evolution, is something that I have never…"
Jan 24
Robert J. Mitchell liked Robert J. Mitchell's discussion Is life that rare or are we just selfish
Jan 19
Sara Imari Walker liked Robert J. Mitchell's discussion Is life that rare or are we just selfish
Jan 18
Robert J. Mitchell added a discussion to the group SES 311:Essentials of Astrobiology
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Is life that rare or are we just selfish

In discussing the definition of life, the conversation inevitably turns to the philosophical. A simple question, 'what is life' has taken the brightest minds of all time thousands of years to search for answers, which largely only lead to more questions. Science looks to define life largely to properly identify it as humankind searches the cosmos for another sample.In an article on NASA's website titled: Life's working definition: Does it Work, the space agency, as of 2003, defines life in the…See More
Jan 18
Robert J. Mitchell and Sara Imari Walker are now friends
Jan 16
Robert J. Mitchell is now a member of SAGANet
Jan 11

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Robert J. Mitchell's Blog

Life as a Carnot Cycle (Blog 2)

Posted on February 5, 2018 at 1:44pm 0 Comments

For at least the last few meetings we have discussed the idea of LUCA. A name for the evidence that suggests that all life, bacterial, archaeal, and eucaryal, all formed from a common organism. Woese suggests that LUCA, or the root of the universal phylogenetic tree, could not have equivalent metabolically to "modern cells." In his paper, Woese seems to dismiss the idea of a metabolism-first world instead providing evidence for horizontal gene transfer (HGT) in an RNA-first…

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