Trinity L. Hamilton

TL;DR: The hypothesis that anoxygenic photosynthesis, including the activity of metabolically versatile cyanobacteria played an important role in delaying the oxygenation of Earth's surface ocean during the Proterozoic Eon is supported.

TL;DR: The results are highly suggestive that among extant nitrogen‐fixing organisms for which genomic information exists, Mo‐nitrogenase is unlikely to have been associated with the Last Universal Common Ancestor and can be traced to an ancestor of the anaerobic and hydrogenotrophic methanogens with acquisition in the bacterial domain via lateral gene transfer involving an anaerilic member of the Firmicutes.

TL;DR: A role for nitrification and nitrate reduction in sustaining microbial life in subglacial environments is suggested and furthers understanding of the potential for these environments to contribute to global biogeochemical cycles on glacial-interglacial timescales.

TL;DR: The presence of active and endogenous archaeal, bacterial and eukaryal assemblages in cold (0–1 °C) subglacial sediments sampled from Robertson Glacier, Alberta, Canada is demonstrated and demonstrates thatSubglacial environments harbor endogenous active ecosystems that have the potential to impact global biogeochemical cycles over extended periods of time.

TL;DR: A modern synthesis of the microbial ecology of mountain glacier ecosystems, and particularly those at low- to mid-latitudes, is provided, focusing on five ecological zones: the supraglacial surface, englacial interior, subglacial bedrock-ice interface, proglacial streams and glacier forefields.