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| http://dx.doi.org/10.1073/pnas.1616346113 | DOI Listing |
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An appeal to magic? The discovery of a non-enzymatic metabolism and its role in the origins of life.
Biochem J
August 2018
Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, 80 Tennis Court Rd, Cambridge CB2 1GA, U.K.
Until recently, prebiotic precursors to metabolic pathways were not known. In parallel, chemistry achieved the synthesis of amino acids and nucleotides only in reaction sequences that do not resemble metabolic pathways, and by using condition step changes, incompatible with enzyme evolution. As a consequence, it was frequently assumed that the topological organisation of the metabolic pathway has formed in a Darwinian process.
View Article and Find Full Text PDFPeridotite weathering is the missing ingredient of Earth's continental crust composition.
Nat Commun
February 2018
The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, Perth, WA, 6845, Australia.
The chemical composition of the continental crust cannot be adequately explained by current models for its formation, because it is too rich in Ni and Cr compared to that which can be generated by any of the proposed mechanisms. Estimates of the crust composition are derived from average sediment, while crustal growth is ascribed to amalgamation of differentiated magmatic rocks at continental margins. Here we show that chemical weathering of Ni- and Cr-rich, undifferentiated ultramafic rock equivalent to ~1.
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