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14. december 2018 kl. 11:47 #319759
- Super Nova
Part 1: What is life–that it might create itself?
Origin of life models based on “energized assemblages of building blocks” are untenable in principle. This is fundamentally a consequence of the fact that any living system is in a physical state that is extremely far from equilibrium, a condition it must itself build and sustain. This in turn requires that it carries out all of its molecular transformations–obligatorily those that convert, and thereby create, disequilibria–using case‐specific mechanochemical macromolecular machines. Mass‐action solution chemistry is quite unable to do this. We argue in Part 2 of this series that this inherent dependence of life on disequilibria‐converting macromolecular machines is also an obligatory requirement for life at its emergence. Therefore, life must have been launched by the operation of abiotic macromolecular machines driven by abiotic, but specifically “life‐like”, disequilibria, coopted from mineral precipitates that are chemically and physically active. Models grounded in “chemistry‐in‐a‐bag” ideas, however energized, should not be considered.
Part 2: As life is now, so it must have been in the beginning
We argued in Part 1 of this series that because all living systems are extremely far‐from‐equilibrium dynamic confections of matter, they must necessarily be driven to that state by the conversion of chemically specific external disequilibria into specific internal disequilibria. Such conversions require task‐specific macromolecular engines. We here argue that the same is not only true of life at its emergence; it is the enabling cause of that emergence; although here the external driving disequilibria, and the conversion engines needed must have been abiotic. We argue further that the initial step in life’s emergence can only create an extremely simple non‐equilibrium “seed” from which all the complexity of life must then develop. We assert that this complexity develops incrementally and progressively, each step tested for value added “in flight.” And we make the case that only the submarine alkaline hydrothermal vent (AHV) model has the potential to satisfy these requirements.14. december 2018 kl. 11:50 #319760
- Super Nova
Beklager. Biologiske artikler er ikke gratis, selvom NASA har betalt for den. Jeg har ikke fundet en lovlig kopi.
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