Download Between Necessity and Probability: Searching for the by Radu Popa PDF

By Radu Popa

This research investigates the most important theories of the origins of existence in gentle of contemporary study with the purpose of distinguishing among the mandatory and the non-compulsory and among deterministic and random impacts within the emergence of what we name ?life.? lifestyles is handled as a cosmic phenomenon whose emergence and driver might be seen independently from its Earth-bound average heritage. the writer synthesizes the entire basic life-related advancements in a finished situation, and makes the argument that realizing lifestyles in its broadest context calls for a material-independent point of view that identifies its crucial fingerprints.

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Inorganic chemicals are not the only simple natural catalysts. Simple monomers such as amino acids could also have been used for their catalytic capabilities (Bar-Nun et al. 1994). Although simple catalysts are thermodynamically more reliable, their catalytic performances are somewhat limited while their substrate specificity is rather low. Early life forms exclusively using such catalysts could not have reached satisfactory efficiency while competing with external processes. One must assume that during the early stages of life (the beginning of sequences 1 and 2 in Fig.

No single parameter presented so far may be solely responsible for the origin of life. 2. The main energy-related features in the early history of life Minimal requirements Fundamental features Major derived properties Power density > 0 Catalysis Power density > SΘ Reflexive activity Natural diversity Energy transduction Competitive energy subtraction Ref ≥ ∆SΘ Energetic opportunism Energy currencies Energy reserves Energy regulation Self-repair Growth Self-reproduction exclusive life-discriminating properties.

Energy transduction is also considered to be subsequent because catalysis is rather common in the geochemical world and because some life-independent types of reflexive activity involving very simple mechanisms may exist. The transduction of external energy into water-soluble currencies was probably invented after the encasement in 30 2 The Early History of Bioenergy Fig. 10. Substrate-level phosphorylation. Glycolysis is one of the major types of substrate-level phosphorylation. , ATP) in solution.

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