Results 71 to 80 of about 3,737,177 (309)

Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen

Nature Communications, 2018
There is a long standing debate whether low atmospheric oxygen levels during the Mesoproterozoic Era hindered the evolution of crown-group animals. Here, the authors show with shale-hosted chromium isotopes that sufficient atmospheric oxygen for crown ...
Donald E. Canfield, Shuichang Zhang, Anja B. Frank, Xiaomei Wang, Huajian Wang, Jin Su, Yuntao Ye, Robert Frei   +7 more
doaj   +1 more source

Determination of dissolved organic carbon and total dissolved nitrogen in seawater using High Temperature Combustion Analysis

Frontiers in Marine Science, 2022
This document describes best practices for analysis of dissolved organic matter (dissolved organic carbon and total dissolved nitrogen) in seawater samples.
Elisa Halewood, Keri Opalk, Lillian Custals, Maverick Carey, Dennis A. Hansell, Craig A. Carlson   +5 more
doaj   +1 more source

Molecular dynamics simulations of positively selected codons in FcγRI reveal novel biochemical binding properties

FEBS Open Bio, EarlyView.
Evolutionary analysis across 32 placental mammals identified positive selection at residues H148 and W149 in the immune receptor FcγR1. Ancestral reconstruction combined with molecular dynamics simulations reveals how these mutations may influence receptor structure and dynamics, providing insight into the evolution of antibody recognition and immune ...
David A. Young, Omar Arias‐Gaguancela, Fiona Gibson, Morgan Grainger, Jodie Score, Amit Nathubhai, Mauricio Cafiero, Lee Richard Machado   +7 more
wiley   +1 more source

On the Dual Nature of Atmospheric Escape

The Astrophysical Journal
Planetary atmospheres cannot remain hydrostatic at all altitudes because they approach finite density at infinite radius, implying infinite mass. Classical treatments address this in two directions: either retain a hydrostatic structure while allowing ...
Darius Modirrousta-Galian, Jun Korenaga
doaj   +1 more source

Evolution of the Archean atmosphere

16 pages, 1 figure. Accepted for publication as: Colin Goldblatt, Jake K. Eager-Nash, and Julia E. Horne (in press) "Evolution of the Archean Atmosphere", in: "The Archean Earth" (ed.: Martin Homan, Paul Mason, Richard Ernst, Timothy Lyons, Christoph Heubeck, Dominic Papineau, Eva Stueeken, Rajat Mazumder, Alexander Webb, Wladyslaw Altermann ...
Colin Goldblatt, Jake K. Eager-Nash, Julia E. Horne   +2 more
openaire   +2 more sources

Aquaporin‐3 and aquaporin‐5 impact the development of pancreatic ductal adenocarcinoma spheroids

FEBS Open Bio, EarlyView.
Schematic representation of the role of aquaporin‐3 (AQP3) and aquaporin‐5 (AQP5) in pancreatic ductal adenocarcinoma (PDAC). Both proteins are upregulated in PDAC and are associated with tumor progression and metastatic potential. Silencing AQP3 or AQP5 in PDAC spheroids results in decreased diameter, area, and overall growth, underscoring their key ...
Catarina Pimpão, Diogo M. Engrácia, Graça Soveral, Filipa Mendes   +3 more
wiley   +1 more source

Helium Depletion in Escaping Atmospheres of Sub-Neptunes: A Signature of Primary-to-secondary Transition

The Astrophysical Journal
Short-period sub-Neptunes are common in extrasolar systems. These sub-Neptunes are generally thought to have primary atmospheres of protoplanetary-disk gas origin.
Issei Kobayashi, Hiroyuki Kurokawa, Laura Schaefer, Satoshi Okuzumi   +3 more
doaj   +1 more source

Oligocene incursion of the Paratethys seawater to the Junggar Basin, NW China: insight from multiple isotopic analysis of carbonate

Scientific Reports, 2020
The Cenozoic retreat of the Paratethys Sea, as well as uplift of the Tibet plateau and global cooling, have been considered as the main mechanisms for the onset of the Asian monsoon.
Qian Li, Long Li, Yuanyuan Zhang, Zhaojie Guo   +3 more
doaj   +1 more source

Modeling Martian Atmospheric Losses over Time: Implications for Exoplanetary Climate Evolution and Habitability [PDF]

, 2018
In this Letter, we make use of sophisticated 3D numerical simulations to assess the extent of atmospheric ion and photochemical losses from Mars over time.
C. Dong, Yuni Lee, Yingjuan Ma, M. Lingam, S. Bougher, J. Luhmann, S. Curry, G. Tóth, A. Nagy, V. Tenishev, X. Fang, D. Mitchell, D. Brain, B. Jakosky   +13 more
semanticscholar   +1 more source

Loss of AMBRA1 activates MAPK and angiogenesis signaling pathways in melanoma cells

FEBS Open Bio, EarlyView.
Loss of AMBRA1 in melanoma cells activates multiple oncogenic pathways associated with tumor progression. Transcriptomic and protein network analyses revealed that AMBRA1 depletion enhances MAPK/ERK signaling, angiogenesis, TGF‐β/EMT signaling, and Wnt/axon guidance pathways.
Milad Ibrahim, Marco Corazzari, Iman Osman, Jane Armstrong, Noel Carter   +4 more
wiley   +1 more source