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- Publications
- Influence
Partitioning of Bacterial Communities between Seawater and Healthy, Black Band Diseased, and Dead Coral Surfaces
- Jorge Frias-Lopez, A. Zerkle, G. Bonheyo, B. Fouke
- Medicine, Biology
- Applied and Environmental Microbiology
- 1 May 2002
ABSTRACT Distinct partitioning has been observed in the composition and diversity of bacterial communities inhabiting the surface and overlying seawater of three coral species infected with black… Expand
Geological constraints on the origin of oxygenic photosynthesis
- J. Farquhar, A. Zerkle, A. Bekker
- Chemistry, Medicine
- Photosynthesis Research
- 2010
This article examines the geological evidence for the rise of atmospheric oxygen and the origin of oxygenic photosynthesis. The evidence for the rise of atmospheric oxygen places a minimum time… Expand
A bistable organic-rich atmosphere on the Neoarchaean Earth
- A. Zerkle, M. Claire, S. Domagal-Goldman, J. Farquhar, S. Poulton
- Geology
- 1 May 2012
Before the rise of oxygen, the atmosphere of the early Earth may have consisted of an organic haze. Geochemical data and modelling suggest that from 2.65 to 2.5 Gyr ago, several transitions between… Expand
Sulfate was a trace constituent of Archean seawater
- S. Crowe, G. Paris, +9 authors D. Canfield
- Environmental Science, Medicine
- Science
- 7 November 2014
Dissecting ancient microbial sulfur cycling Before the rise of oxygen, life on Earth depended on the marine sulfur cycle. The fractionation of different sulfur isotopes provides clues to which… Expand
High isotope fractionations during sulfate reduction in a low-sulfate euxinic ocean analog
- D. Canfield, J. Farquhar, A. Zerkle
- Geology
- 1 May 2010
A detailed record of the early-Earth sulfur (S) cycle is chronicled by the S isotope values of sulfide and sulfate preserved in the rock record. Interpretation of this record rests on our… Expand
Pathways for Neoarchean pyrite formation constrained by mass-independent sulfur isotopes
- J. Farquhar, J. Cliff, +5 authors B. Harms
- Medicine, Geology
- Proceedings of the National Academy of Sciences
- 13 February 2013
It is generally thought that the sulfate reduction metabolism is ancient and would have been established well before the Neoarchean. It is puzzling, therefore, that the sulfur isotope record of the… Expand
Biogeochemical signatures through time as inferred from whole microbial genomes
- A. Zerkle, C. House, S. Brantley
- Biology
- 1 June 2005
Throughout geologic time, a strong feedback has existed between the geosphere and the biosphere; therefore biological evolution and innovation can be linked to the evolution of ancient environments… Expand
Multiple oscillations in Neoarchaean atmospheric chemistry
Abstract The Great Oxidation Event (GOE) represents a crucial juncture in Earth history, signifying the rise in atmospheric oxygen from parts per million to percent levels at ∼2.45–2.32… Expand
Onset of the aerobic nitrogen cycle during the Great Oxidation Event
- A. Zerkle, S. Poulton, +4 authors C. Junium
- Biology, Medicine
- Nature
- 23 February 2017
The rise of oxygen on the early Earth (about 2.4 billion years ago) caused a reorganization of marine nutrient cycles, including that of nitrogen, which is important for controlling global primary… Expand
Stable sulfur isotopes in the water column of the Cariaco Basin
- Xiaona Li, W. Gilhooly, +5 authors M. Scranton
- Chemistry
- 1 December 2010
Previous geochemical and microbiological studies in the Cariaco Basin indicate intense elemental cycling and a dynamic microbial loop near the oxic–anoxic interface. We obtained detailed… Expand