Results 41 to 50 of about 71,705 (309)

The Predictive Skill of a Remote Sensing-Based Machine Learning Model for Ice Wedge and Visible Ground Ice Identification in Western Arctic Canada

Remote Sensing
Fine-scale maps of ground ice and related surface features are critical for permafrost-related modelling and management. However, such maps are lacking across almost the entire Arctic.
Qianyu Chang, Simon Zwieback, Aaron A. Berg   +2 more
doaj   +1 more source

High-centered polygons in the Sør Rondane Mountains, East Antarctica: Possible effect of ice wedge sublimation [PDF]

, 2006
Small high-centered polygons, 3-15m in diameter, dominate moraine fields in an inland cold desert of the Sør Rondane Mountains, Antarctica. They mainly occur on moraine fields at two stages younger than 1Ma. The polygons on the younger moraine (
Kazuomi Hirakawa, Norikazu Matsuoka
core   +1 more source

Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons [PDF]

, 2020
Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between the rate of ice-wedge degradation and changes in hydrological characteristics.
Dafflon, B, Gomez-Velez, JD, Kneafsey, TJ, Newman, BD, Soom, F, Wales, NA, Wilson, CJ, Wullschleger, SD   +7 more
core  

Retention of a Primordial Cold Classical Kuiper Belt in an Instability-Driven Model of Solar System Formation [PDF]

, 2011
The cold classical population of the Kuiper belt exhibits a wide variety of unique physical characteristics, which collectively suggest that its dynamical coherence has been maintained through out the solar system's lifetime.
Batygin, Konstantin, Brown, Michael E., Fraser, Wesley C.   +2 more
core   +3 more sources

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Effects of ice-wedge degradation and warming on Arctic tundra vegetation across a climatic gradient using a nitrogen-based model

Arctic, Antarctic, and Alpine Research
Ice-wedge polygons in Arctic tundra landscapes influence hydrology, nutrients, thermal regimes, and vegetation. Ice-wedges are particularly vulnerable to warming events, and widespread degradation has been observed in recent decades.
Kelcy Kent, Howard E. Epstein, Lindsay Grose, Mark Torre Jorgenson, Anna Liljedahl   +4 more
doaj   +1 more source

Regional Patterns and Asynchronous Onset of Ice-Wedge Degradation since the Mid-20th Century in Arctic Alaska

Remote Sensing, 2018
Ice-wedge polygons are widespread and conspicuous surficial expressions of ground-ice in permafrost landscapes. Thawing of ice wedges triggers differential ground subsidence, local ponding, and persistent changes to vegetation and hydrologic connectivity
Gerald V. Frost, Tracy Christopherson, M. Torre Jorgenson, Anna K. Liljedahl, Matthew J. Macander, Donald A. Walker, Aaron F. Wells   +6 more
doaj   +1 more source

Cell surface interactome analysis identifies TSPAN4 as a negative regulator of PD‐L1 in melanoma

Molecular Oncology, EarlyView.
Using cell surface proximity biotinylation, we identified tetraspanin TSPAN4 within the PD‐L1 interactome of melanoma cells. TSPAN4 negatively regulates PD‐L1 expression and lateral mobility by limiting its interaction with CMTM6 and promoting PD‐L1 degradation.
Guus A. Franken, Andrea Abel Gutierrez, Imke van Rossum, Cornelia G. Spruijt, Michiel Vermeulen, Guido van Mierlo, Blanca Scheijen, Annemiek B. van Spriel   +7 more
wiley   +1 more source

High potential for loss of permafrost landforms in a changing climate

Environmental Research Letters, 2020
The presence of ground ice in Arctic soils exerts a major effect on permafrost hydrology and ecology, and factors prominently into geomorphic landform development.
Olli Karjalainen, Miska Luoto, Juha Aalto, Bernd Etzelmüller, Guido Grosse, Benjamin M Jones, Karianne S Lilleøren, Jan Hjort   +7 more
doaj   +1 more source

Vertex operators, solvable lattice models and metaplectic Whittaker functions

, 2020
We show that spherical Whittaker functions on an $n$-fold cover of the general linear group arise naturally from the quantum Fock space representation of $U_q(\widehat{\mathfrak{sl}}(n))$ introduced by Kashiwara, Miwa and Stern (KMS).
Brubaker, Ben, Buciumas, Valentin, Bump, Daniel, Gustafsson, Henrik P. A.   +3 more
core   +1 more source