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MAPPING THE DARK MATTER IN THE NGC 5044 GROUP WITH ROSAT : EVIDENCE FOR A NEARLY HOMOGENEOUS COOLING FLOW WITH A COOLING WAKE
The NGC 5044 group of galaxies was observed by the ROSAT Position Sensitive Proportional Counter (PSPC) for 30 ks during its reduced pointed phase (1991 July). Due to the relatively cool gas
The impact of temperature on marine phytoplankton resource allocation and metabolism
TLDR
This approach indicates that temperature plays a previously unrecognized, critical role in resource allocation and marine phytoplankton elemental ratios, with implications for biogeochemical cycling.
Ocean acidification and the Permo-Triassic mass extinction
TLDR
A high-resolution seawater pH record is presented across this interval, using boron isotope data combined with a quantitative modeling approach, to present a possible kill mechanism for the Permo-Triassic Boundary mass extinction.
Earliest land plants created modern levels of atmospheric oxygen
TLDR
The earliest plants, which colonized the land surface from ∼470 Ma onward, were responsible for this mid-Paleozoic oxygenation event, through greatly increasing global organic carbon burial—the net long-term source of O2.
Environmental selection and resource allocation determine spatial patterns in picophytoplankton cell size
TLDR
A model that represents selection and adaptation of a diverse community defined by traits for cell size and subcellular resource allocation is used to investigate the adaptive response of the marine microbial community to environmental conditions and the adaptive value of variations in cellular physiology.
COPSE reloaded: An improved model of biogeochemical cycling over Phanerozoic time
Abstract The ‘COPSE’ (Carbon, Oxygen, Phosphorus, Sulphur and Evolution) biogeochemical model predicts the coupled histories and controls on atmospheric O2, CO2 and ocean composition over Phanerozoic
Atmospheric oxygen regulation at low Proterozoic levels by incomplete oxidative weathering of sedimentary organic carbon
It is unclear why atmospheric oxygen remained trapped at low levels for more than 1.5 billion years following the Paleoproterozoic Great Oxidation Event. Here, we use models for erosion, weathering
Multiple environmental controls on phytoplankton growth strategies determine adaptive responses of the N : P ratio.
TLDR
A spatially variable lower limit on adaptive rRNA:protein allocation is determined on the relationship between the largest cellular P and N pools, which suggests that additional contributions from phospholipid and phosphorus storage compounds play a fundamental role in determining the marine biogeochemical cycling of these elements.
Changing tectonic controls on the long‐term carbon cycle from Mesozoic to present
Tectonic drivers of degassing and weathering processes are key long-term controls on atmospheric CO2. However, there is considerable debate over the changing relative importance of different carbon
The effect of widespread early aerobic marine ecosystems on methane cycling and the Great Oxidation
The balance of evidence suggests that oxygenic photosynthesis had evolved by 3.0–2.7 Ga, several hundred million years prior to the Great Oxidation ≈2.4 Ga. Previous work has shown that if oxygenic
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