Results 31 to 40 of about 1,399 (214)

Contamination analysis of Arctic ice samples as planetary field analogs and implications for future life-detection missions to Europa and Enceladus

Scientific Reports, 2022
Missions to detect extraterrestrial life are being designed to visit Europa and Enceladus in the next decades. The contact between the mission payload and the habitable subsurface of these satellites involves significant risk of forward contamination ...
Lígia F. Coelho, Marie-Amélie Blais, Alex Matveev, Tina Keller-Costa, Warwick F. Vincent, Rodrigo Costa, Zita Martins, João Canário   +7 more
doaj   +1 more source

Volatile trace metals deposited in ice as soluble volcanic aerosols during the 17.7.ka eruptions of Mt Takahe, West Antarctic Rift

Frontiers in Earth Science, 2022
Volatile metals are emitted at significant rates as gases and particulates from volcanoes, although their speciation, bioreactivity and longevity during atmospheric transport are essentially unknown. Ice cores provide detailed yet largely unexplored long-
Emily Mason, Marie Edmonds, Joseph R. McConnell   +2 more
doaj   +1 more source

Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores

Earth and Space Science, 2021
Previous reconstructions of summer temperatures from ice cores have relied on a statistical relationship between a melt layer and temperature observed at nearby stations. This study presents a novel method for reconstructing summer temperatures from melt
Koji Fujita, Sumito Matoba, Yoshinori Iizuka, Nozomu Takeuchi, Akane Tsushima, Yutaka Kurosaki, Teruo Aoki   +6 more
doaj   +1 more source

Prefacing unexplored archives from Central Andean surface-to-bedrock ice cores through a multifaceted investigation of regional firn and ice core glaciochemistry

Journal of Glaciology, 2023
Shallow firn cores, in addition to a near-basal ice core, were recovered in 2018 from the Quelccaya ice cap (5470 m a.s.l) in the Cordillera Vilcanota, Peru, and in 2017 from the Nevado Illimani glacier (6350 m a.s.l) in the Cordillera Real, Bolivia. The
Heather M. Clifford, Mariusz Potocki, Charles Rodda, Daniel Dixon, Sean Birkel, Michael Handley, Elena Korotkikh, Douglas Introne, Franciele Schwanck, Flavia A. Tavares, Ronaldo T. Bernardo, Filipe G. L. Lindau, Oscar Vilca Gomez, Harrison Jara-Infantes, Victor Bustínza Urviola, L. Baker Perry, Jonathan Maurer, Anton Seimon, Margit Schwikowski, Gino Casassa, Shugui Hou, Andrei V. Kurbatov, Kimberley R. Miner, Jefferson C. Simões, Paul A. Mayewski   +24 more
doaj   +1 more source

Summer temperature trend over the past two millennia using air content in Himalayan ice [PDF]

Climate of the Past, 2007
Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period.
S. Hou, S. Hou, S. Hou, J. Chappellaz, J. Jouzel, P. C. Chu, V. Masson-Delmotte, D. Qin, D. Raynaud, P. A. Mayewski, V. Y. Lipenkov, S. Kang   +11 more
doaj  

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

Exploring ice core drilling chips from a cold Alpine glacier for cosmogenic radionuclide (10Be) analysis

Results in Physics, 2016
Ice cores offer unique multi-proxy paleoclimate records, but provide only very limited sample material, which has to be carefully distributed for various proxy analyses.
Lars Zipf, Silke Merchel, Pascal Bohleber, Georg Rugel, Andreas Scharf   +4 more
doaj   +1 more source

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

Glacio-environmental aspects recorded in two shallow ice cores drilled in 1980 at accumulation area of Khumbu Glacier of Mt. Everest in Nepal Himalayas

Arctic, Antarctic, and Alpine Research, 2020
The physical and geochemical characteristics of shallow ice cores drilled in the accumulation area (Western Cwm) of Khumbu Glacier in the Nepal Himalayas in 1980 were analyzed.
Nozomu Takeuchi, Yoichiro Hori, Noboru Furukawa, Minoru Yoshida, Yoshiyuki Fujii   +4 more
doaj   +1 more source

Organ‐specific redox imbalances in spinal muscular atrophy mice are partially rescued by SMN antisense oligonucleotides

FEBS Letters, EarlyView.
We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley   +1 more source