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Considerable discussion surrounds the potential role of anoxygenic phototrophic Fe(II)-oxidizing bacteria in both the genesis of Banded Iron Formations (BIFs) and early marine productivity. However, anoxygenic phototrophs have yet to be identified in modern environments with comparable chemistry and physical structure to the ancient Fe(II)-rich(More)
In the low-oxygen Archean world (>2400 million years ago), seawater sulfate concentrations were much lower than today, yet open questions frustrate the translation of modern measurements of sulfur isotope fractionations into estimates of Archean seawater sulfate concentrations. In the water column of Lake Matano, Indonesia, a low-sulfate analog for the(More)
This study explores Mn biogeochemistry in a stratified, ferruginous lake, a modern analogue to ferrugi-nous oceans. Intense Mn cycling occurs in the chemocline where Mn is recycled at least 15 times before sedimenta-tion. The product of biologically catalyzed Mn oxidation in Lake Matano is birnessite. Although there is evidence for abiotic Mn reduction with(More)
It is has been assumed for over half a century that the earliest animals were obligate aerobes with relatively high oxygen requirements. However, the conserved biochemistry and widespread phylogenetic distribution of anaerobic energy metabolism in animals suggests a deep ancestral possession of the genes and enzymes necessary for a facultative anaerobic(More)
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