It is well established that greenhouse conditions prevailed during the Cretaceous Period (~
145–66 Ma). Determining the exact nature of the greenhouse-gas forcing, climatic warming …

Abstract The Eocene–Oligocene transition (EOT) was a climate shift from a largely ice-free
greenhouse world to an icehouse climate, involving the first major glaciation of Antarctica …

Microbial lipid biomarkers preserved in geological archives can be used to explore past
climate changes. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are unique …

The cause of the end-Cretaceous mass extinction is vigorously debated, owing to the
occurrence of a very large bolide impact and flood basalt volcanism near the boundary …

The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time
that Earth's atmospheric CO 2 concentrations exceeded 1000 ppm. Global mean …

Fossilized lipids preserved in sedimentary rocks offer singular insights into the Earth's
palaeobiology. These 'biomarkers' encode information pertaining to the oxygenation of the …

The dynamics of the particulate organic carbon (POC) pool in the ocean are central to the
marine carbon cycle. POC is the link between surface primary production, the deep ocean …

Four mesophilic, neutrophilic, and aerobic marine ammonia-oxidizing archaea, designated
strains SCM1T, HCA1T, HCE1T and PS0T, were isolated from a tropical marine fish tank …

Ammonia-oxidizing archaea (AOA) are among the most abundant and ubiquitous
microorganisms in the ocean, exerting primary control on nitrification and nitrogen oxides …

Archaea are ubiquitous and abundant members of the marine plankton. Once thought of as
rare organisms found in exotic extremes of temperature, pressure, or salinity, archaea are …