Tonight I watched the next episode in the series by Dr. James Tour.
The video mainly corrects several inaccuracies in Dr. Farina's first video.
The following quote is just one of the many interesting remarks made by Dr. Tours:
Twice Dr. Tour questioned if he put us to sleep with this video. Lol.
With the last 2 episodes Dr. Tours has done a decent job summarizing what he was teaching. If someone just wants a quick overview without all the details, then I'd suggest watching from the summary time stamp at the end, or perhaps beginning a few minutes earlier. The summary doesn't point out the inaccuracies made by Dr. Farina, so to get the most out of the video, it is best to watch the whole thing.
Episode 5/13: Carbohydrates // A Course on Abiogenesis by Dr. James Tour
In this episode on carbohydrates, Dr. James Tour teaches the 1st class of compounds needed for life -- carbohydrates-- and comes right out of the gate, refuting the claimed triviality of their biomolecular synthesis. Rather than agree with the claim on the ease of polysaccharide synthesis, Dr. Tour explains the difficulty of their creation, including homochirality and the prebiotic problems facing multiple isomers, blind pathways, and polymerization and positioning. Also, Dr. Tour points out the fallacy of borrowing products from biology in prebiotic syntheses, and the challenge of early Earth blindly working through unfathomable procedures.
Video Index:
00:00 - Introduction
00:48 - Reasons & Intent of this Abiogenesis Series
02:45 - Correcting the Record on Polysaccharide & Biomolecular Synthesis 07:28 - Before Nucleotides, Ribose
09:48 - Cannizzaro vs Formose
13:01 - Eschenmoser's attempt
19:47 - Time & Equilibrium
22:18 - "homo-DNA" instead
23:36 - Real world difficulties
25:53 - Polymerization - Hooking the Sugars
42:36 - Summary and What's Next
The video mainly corrects several inaccuracies in Dr. Farina's first video.
The following quote is just one of the many interesting remarks made by Dr. Tours:
32:00 Remember all that goop that Eschenmoser made? That’s what you would get with this. You’d get 32 possible isomers plus all the polymerization adducts of these. Ugh! Nobody knows how this was made on pre-biotic earth. So how do origin-of-life people deal with it? They just buy these. Where does the manufacturer, where do the people who sell these, get it? Well, they get it from nature. ‘Cause nature just spits these things out. Biology is amazing. Nobody knows where it came from on prebiotic earth. You see why it’s frustrating to have people just trivialize this stuff?
With the last 2 episodes Dr. Tours has done a decent job summarizing what he was teaching. If someone just wants a quick overview without all the details, then I'd suggest watching from the summary time stamp at the end, or perhaps beginning a few minutes earlier. The summary doesn't point out the inaccuracies made by Dr. Farina, so to get the most out of the video, it is best to watch the whole thing.
In this episode on carbohydrates, Dr. James Tour teaches the 1st class of compounds needed for life -- carbohydrates-- and comes right out of the gate, refuting the claimed triviality of their biomolecular synthesis. Rather than agree with the claim on the ease of polysaccharide synthesis, Dr. Tour explains the difficulty of their creation, including homochirality and the prebiotic problems facing multiple isomers, blind pathways, and polymerization and positioning. Also, Dr. Tour points out the fallacy of borrowing products from biology in prebiotic syntheses, and the challenge of early Earth blindly working through unfathomable procedures.
Video Index:
00:00 - Introduction
00:48 - Reasons & Intent of this Abiogenesis Series
02:45 - Correcting the Record on Polysaccharide & Biomolecular Synthesis 07:28 - Before Nucleotides, Ribose
09:48 - Cannizzaro vs Formose
13:01 - Eschenmoser's attempt
19:47 - Time & Equilibrium
22:18 - "homo-DNA" instead
23:36 - Real world difficulties
25:53 - Polymerization - Hooking the Sugars
42:36 - Summary and What's Next
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