Episode 5/13: Carbohydrates // A Course on Abiogenesis by Dr. James Tour

Описание: 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

Links in this Series | Addressing Abiogenesis & Common Misconceptions
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Series Trailer:    • Illuminating the Fog Masking Life's Origin...  
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0 - Reasons for this Series:    • Episode 0/13: Reasons // A Course on Abiog...  
1 - Introduction to Abiogenesis:    • Episode 1/13: Introduction to Abiogenesis ...  
2 - Primordial Soup:    • Episode 2/13: Primordial Soup // A Course ...  
3 - Hype:    • Episode 3/13: Hype // A Course on Abiogene...  
4 - Homochirality:    • Episode 4/13: Homochirality // A Course on...  
5 - Carbohydrates:    • Episode 5/13: Carbohydrates // A Course on...  
6 - Building Blocks of Building Blocks:    • Episode 6/13: The Building Blocks of Build...  
7 - Peptides:    • Episode 7/13: Peptides // A Course on Abio...  
8 - Nucleotides:    • Episode 8/13: Nucleotides // A Course on A...  
9 - Intermediate Summary & a Call to Colleagues:    • Episode 9/13: Intermediate Summary // A Co...  
10 - Lipids:    • Episode 10/13: Lipids // A Course on Abiog...  
11 - Chiral-induced Spin Selectivity:    • Episode 11/13: Chiral-induced Spin Selecti...  
12.1 - Cell Construction & The Assembly Problem, Part 1:    • Episode 12.1/13: Cell Construction & Assem...  
12.2 - Cell Construction & The Assembly Problem, Part 2:    • Episode 12.2/13: Cell Construction & Assem...  
13 - Summary & Projections:    • Episode 13/13: Summary & Projections // A ...  

Link to the cited video ("Elucidating the Agenda of James Tour: A Defense of Abiogenesis") can be found in the video description of Episode 0 - "Reasons for this Series" here:    • Episode 0/13: Reasons // A Course on Abiog...  

The passionate thumbnail for this video uses a still frame image taken from Dr. Tour's video on Flash Graphene when he says "any" in the phrase "any carbon source" at 0:12:    • Flash Graphene Changing the World  

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#Abiogenesis #JamesTour #OriginOfLife

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