Results 41 to 50 of about 1,022,984 (305)

Core handling and processing for the WAIS Divide ice-core project [PDF]

, 2017
On 1 December 2011 the West Antarctic Ice Sheet (WAIS) Divide ice-core project reached its final depth of 3405 m. The WAIS Divide ice core is not only the longest US ice core to date, but is also the highest-quality deep ice core, including ice from the ...
Bencivengo, Brian M., Cravens, Eric D., Hargreaves, Geoffrey M., Johnson, Jay A., Kippenhan, Matthew J., Neff, Peter D., Nunn, Richard M., Orsi, Anais J., Popp, Trevor J., Rhoades, John F., Souney, Joseph M., Taylor, Kendrick C., Twickler, Mark S., Vaughn, Bruce H., Voigt, Donald E., Wong, Gifford J.   +15 more
core   +1 more source

Deformation of grain boundaries in polar ice

, 2004
The ice microstructure (grain boundaries) is a key feature used to study ice evolution and to investigate past climatic changes. We studied a deep ice core, in Dome Concordia, Antarctica, which records past mechanical deformations. We measured a "texture
Anderson M. P., Arnaud L., Azuma N., F Graner, G Durand, Gay M., Hammer C. U., J Weiss, Mecke K., Weiss J.   +9 more
core   +3 more sources

New modeling of the Vostok ice flow line and implication for the glaciological chronology of the Vostok ice core [PDF]

, 2004
International audienceWe have used new spaceborne (elevation) and airborne (ice thickness) data to constrain a 2D1/2 model of snow accumulation and ice flow along the Ridge B‐Vostok station ice flow line (East Antarctica). We show that new evaluations of
Arnaud, Bard, Bender, Blunier, Blunier, Connolley, Drewry, Drewry, EPICA Community Members, F. Parrenin, Genty, Hutter, Imbrie, Jouzel, Lorius, Parrenin, Parrenin, Petit, Raisbeck, Raisbeck, Raisbeck, Richardson, Ritz, Ritz, Rémy, Shackleton, Siegert, Testut, Udisti, Wang, Yiou   +30 more
core   +3 more sources

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

A full Stokes ice-flow model to assist the interpretation of millennial-scale ice cores at the high-Alpine drilling site Colle Gnifetti, Swiss/Italian Alps

Journal of Glaciology, 2020
The high-Alpine ice-core drilling site Colle Gnifetti (CG), Monte Rosa, Swiss/Italian Alps, provides climate records over the last millennium and beyond.
Carlo Licciulli, Pascal Bohleber, Josef Lier, Olivier Gagliardini, Martin Hoelzle, Olaf Eisen   +5 more
doaj   +1 more source

Agile Sub-Ice Geological (ASIG) Drill development and Pirrit Hills field project

Annals of Glaciology, 2021
A new drilling system was developed by the US Ice Drilling Program (IDP) to rapidly drill through overlying ice to collect subglacial rock cores. The Agile Sub-Ice Geological (ASIG) Drill system is capable of drilling up to 700 m of ice in a continuous ...
Tanner Kuhl, Chris Gibson, Jay Johnson, Grant Boeckmann, Elliot Moravec, Kristina Slawny   +5 more
doaj   +1 more source

A simple model to estimate atmospheric concentrations of aerosol chemical species based on snow core chemistry at Summit, Greenland [PDF]

, 1995
A simple model is presented to estimate atmospheric concentrations of chemical species that exist primarily as aerosols based on snow core/ice core chemistry at Summit, Greenland. The model considers the processes of snow, fog, and dry deposition.
Bergin, M H, Davidson, C, Dibb, Jack E., Jaffrezo, J L, Kuhns, H D, Pandis, S N   +5 more
core   +2 more sources

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Evaluating marine dust records as templates for optical dating of Oldest Ice [PDF]

Climate of the Past
The continuous ice core record extends 800 000 years into the past, covering the period of 100 000-year glacial cycles but not the transition from 40 000-year glacial cycles (the mid-Pleistocene transition, 1.2–0.7 million years ago).
J. Ng, J. Severinghaus, R. Bay, D. Tosi
doaj   +1 more source