Results 91 to 100 of about 3,958,760 (345)

Modern Black Sea oceanography applied to the end-Permian extinction event

Journal of Palaeogeography, 2015
The modern Black Sea has a mixed upper layer in the top 150–200 m of the water column, below which the water is anoxic, separated from the mixed layer by a redox boundary. There is limited vertical movement of water.
Steve Kershaw
doaj   +1 more source

Defect Analysis of the β– to γ–Ga2O3 Phase Transition

Advanced Functional Materials, EarlyView.
The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas, Maciej O. Liedke, Huan Liu, Fabian Ganss, Maik Butterling, Nico Klingner, René Hübner, Ilja Makkonen, Andreas Wagner, Gregor Hlawacek   +9 more
wiley   +1 more source

The 2016-2017 peak luminosity of the pre-main sequence variable V2492 Cyg [PDF]

, 2017
V2492 Cyg is a young pre-main sequence star presenting repetitive brightness variations of significant amplitude (Delta R > 5 mag) whose physical origin has been ascribed to both extinction (UXor-type) and accretion (EXor-type) variability, although ...
Antoniucci, S., Arkharov, A. A., Dallaporta, S., Giannini, T., Lorenzetti, D., Munari, U., Rossi, A., Traven, G.   +7 more
core   +2 more sources

Managing Natural Extinctions

Wild
The Earth is facing an extinction crisis caused by anthropogenic activities, with a primary goal of today’s conservation management being the protection of species from being lost to the Anthropocene.
John Gould, Alex Callen, Chad Beranek
doaj   +1 more source

Tailoring Redox Active Sites with Dual‐Interfacial Electric Fields for Concurrent Photocatalytic Biomass Valorization and H2 Production

Advanced Functional Materials, EarlyView.
A rationally engineered bifunctional photocatalyst is reported, which achieves simultaneous selective oxidation of biomass‐derived 5‐hydroxymethylfurfural (HMF) to 2,5‐diformylfuran (DFF) and efficient H2 evolution. By precisely positioning Au and Co3O4 on Zn3In2S6 nanosheet, dual interfacial electric fields are well constructed to spatially separate ...
Shiqing Li, Sugang Meng, Huijun Zhang, Alain R. Puente‐Santiago, Zhongliao Wang, Shifu Chen, Mario J. Muñoz‐Batista, Yu‐Ming Zheng, Bo Weng   +8 more
wiley   +1 more source

Extinction cascades, community collapse, and recovery across a Mesozoic hyperthermal event

Nature Communications
Mass extinctions are considered to be quintessential examples of Court Jester drivers of macroevolution, whereby abiotic pressures drive a suite of extinctions leading to huge ecosystem changes across geological timescales.
Alexander M. Dunhill, Karolina Zarzyczny, Jack O. Shaw, Jed W. Atkinson, Crispin T. S. Little, Andrew P. Beckerman   +5 more
doaj   +1 more source

Harnessing Non‐Covalent Protein–Protein Interaction Domains for Production of Biocatalytic Materials Systems

Advanced Functional Materials, EarlyView.
Non‐covalent protein–protein interactions mediated by SH3, PDZ, or GBD domains enable the self‐assembly of stable and biocatalytically active hydrogel materials. These soft materials can be processed into monodisperse foams that, once dried, exhibit enhanced mechanical stability and activity and are easily integrated into microstructured flow ...
Julian S. Hertel, Maria Alessandra Martini, Marius Stoeckle, Annika J. Weber, Kersten S. Rabe, Christof M. Niemeyer   +5 more
wiley   +1 more source

Propagation and Extinction in Branching Annihilating Random Walks

, 1994
We investigate the temporal evolution and spatial propagation of branching annihilating random walks in one dimension. Depending on the branching and annihilation rates, a few-particle initial state can evolve to a propagating finite density wave, or ...
A. Kolmogoroff, A. Sudbury, D. ben-Avraham, F. Leyvraz, F. Schlögl, H. Takayasu, H. Takayasu, I. Jensen, J. D. Murray, J. L. Cardy, M. Bramson, P. Grassberger, P. Krapivsky, R. A. Fisher, R. C. Brower, S. Redner, T. E. Harris   +16 more
core   +2 more sources

Neural fate of seen and unseen faces in visuospatial neglect: A combined event-related functional MRI and event-related potential study [PDF]

, 2001
This is a post print version of the article. The official published version can be obtained from the link below.To compare neural activity produced by visual events that escape or reach conscious awareness, we used event-related MRI and evoked potentials
Gabrieli, JDE, Hazeltine, E, Poldrack, RA, Rafal, RD, Sagiv, N, Swick, D, Vuilleumier, P   +6 more
core   +2 more sources

A Sixth Mass Extinction? How Linguistic Uncertainty Shapes Our Understanding of the Biodiversity Crisis

Ecology and Evolution
The term ‘sixth mass extinction’ has become synonymous with the current biodiversity crisis. However, despite a general agreement that current biodiversity declines are severe, no consensus has been reached on whether this constitutes a ‘mass extinction ...
Lily Linke, Christopher F. Clements
doaj   +1 more source