[IGPP Everyone] [EPSS Everyone] EPSS Graduate Student Lead Author of PNAS Article

[J.W.Schopf]

Tuesday 18 April 2017

Dear EPSS colleagues, students, staff and friends:

EPSS graduate student Amanda Garcia is lead author of a paper published 
yesterday in the on-line Early Edition of /PNAS/:

GARCIA, A.K., Schopf, J.W., Yokobori, s-i., Akanuma, s., Yamagish, a. 
2017.Reconstructed ancestral enzymes suggest long-term cooling of 
Earth’s photic zone since the Archean./Proceedings of the National 
Academy of Sciences, USA./doi:10.1073/pnas.1702729114__

Flagged by /PNAS /for possible press interest, the summary statement 
prepared by /PNAS/ editors and released to media reads as follows:

*Surface temperatures over geological time*

Analyses of phylogenetic trees of light-requiring prokaryotic and 
eukaryotic phototrophs, organisms that use light for metabolic 
processes, and the thermostabilities of the species’ ancient nucleoside 
diphosphate kinases, which are indicative of the organisms' growing 
conditions, suggest that temperatures of Earth’s surface environment 
decreased from approximately 75°C in the Archean to approximately 35°C 
in the Devonian, consistent with previous isotopic and protein 
temperature reconstructions.

A pdf. copy of the paper is here attached.

We are all pleased by Ms. Garcia's success.Congratulations, Amanda!

J. William (Bill) Schopf

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