Results 51 to 60 of about 3,234 (297)

RAM-2 Drill system development: an upgrade of the Rapid Air Movement Drill

Annals of Glaciology, 2021
Significant upgrades to the Rapid Air Movement (RAM) Drill were developed and tested by the US Ice Drilling Program in 2016 through 2020 for the U.S. National Science Foundation.
Christopher Gibson, Grant Boeckmann, Zachary Meulemans, Tanner Kuhl, Jim Koehler, Jay Johnson, Kristina Slawny   +6 more
doaj   +1 more source

New Seismic Methods to Support Sea-Ice Platform Drilling [PDF]

Scientific Drilling, 2009
The ANtarctic geological DRILLing Program (ANDRILL)is currently a consortium of five nations (Germany, Italy, New Zealand, the United Kingdom, a and the United States of America).
Stephen F. Pekar, David M. Harwood, Richard H. Levy, Marvin A. Speece, Ross D. Powell   +4 more
doaj   +1 more source

Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED)

Annals of Glaciology, 2021
A new, modified version of the cable-suspended Ice and Bedrock Electromechanical Drill (IBED) was designed for drilling in firn, ice, debris-rich ice and rock.
Pavel Talalay, Xingchen Li, Nan Zhang, Xiaopeng Fan, Youhong Sun, Pinlu Cao, Rusheng Wang, Yang Yang, Yongwen Liu, Yunchen Liu, Wei Wu, Cheng Yang, Jialin Hong, Da Gong, Han Zhang, Xiao Li, Yunwang Chen, An Liu, Yazhou Li   +18 more
doaj   +1 more source

Viability of chemical and water isotope ratio measurements of RAID ice chippings from Antarctica

Journal of Glaciology, 2023
The British Antarctic Survey's (BAS) Rapid Access Isotope Drill (RAID), designed for rapid drilling to survey prospective ice core sites, has been deployed at multiple Antarctic locations over 6 years.
Isobel F. Rowell, Robert Mulvaney, Julius Rix, Dieter R. Tetzner, Eric W. Wolff   +4 more
doaj   +1 more source

Air reverse circulation at the hole bottom in ice-core drilling

Journal of Glaciology, 2019
Ice-core drilling to depths of 200–300 m is an important part of research studies concerned with paleoclimate reconstruction and anthropogenic climate change. However, conventional drilling methods face difficulties due to firn permeability.
ZHENGYI HU, PAVEL TALALAY, ZHICHUAN ZHENG, PINLU CAO, GUITAO SHI, YUANSHENG LI, XIAOPENG FAN, HONGMEI MA   +7 more
doaj   +1 more source

Antarctic subglacial drilling rig: Part I. General concept and drilling shelter structure

Annals of Glaciology, 2021
Drilling to the bedrock of ice sheets and glaciers offers unique opportunities for examining the processes occurring in the bed. Basal and subglacial materials contain important paleoclimatic and paleoenvironmental records and provide a unique habitat ...
Pavel Talalay, Youhong Sun, Xiaopeng Fan, Nan Zhang, Pinlu Cao, Rusheng Wang, Alexey Markov, Xingchen Li, Yang Yang, Mikhail Sysoev, Yongwen Liu, Yunchen Liu, Wei Wu, Da Gong   +13 more
doaj   +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

Hot-water coring system with positive displacement motor

, 2020
In this study, a new coring system is designed that uses a positive displacement motor (PDM) connected to a core barrel and drill bit in combination with a hot-water drilling (HWD) system. The surface equipment and water hose are shared and the hot-water
Liu, An, Li, Xingchen, Fan, Xiaopeng, Fan, Dayou, Wang, Liang, Yang, Yang, Talalay, Pavel G.   +6 more
core   +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

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