ORCID Profile
0000-0003-1276-8300
Current Organisations
University of Illinois at Chicago
,
Newcastle University
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Publisher: Wiley
Date: 05-1993
DOI: 10.1111/J.1365-2958.1993.TB01607.X
Abstract: The plasmid-determined arsenite and antimonite efflux ATPase of bacteria differs from other membrane transport ATPases, which are classified into several families (such as the F0F1-type H(+)-translocating ATP synthases, the related vacuolar H(+)-translocating ATPases, the P-type cation-translocating ATPases, and the superfamily which includes the periplasmic binding-protein-dependent systems in Gram-negative bacteria, the human multidrug resistance P-glycoprotein, and the cystic fibrosis transport regulator). The amino acid sequences of the components of the arsenic resistance system are not similar to known ATPase proteins. New findings with the arsenic resistance operons of bacterial plasmids suggest that instead of being an orphan the Ars system will now be the first recognized member of a new class of ATPases. Furthermore, fundamental questions of energy-coupling (ATP-driven or chemiosmotic) have recently been raised and the finding that the arsC gene product is a soluble enzyme that reduces arsenate to arsenite changes the previous picture of the functioning of this widespread bacterial system.
Publisher: Springer Science and Business Media LLC
Date: 10-2020
DOI: 10.1007/S00190-020-01403-6
Abstract: Vertical surface displacements from continuous Global Positioning System (GPS) stations often show strong seasonal signals, which in some cases may be associated with surface mass loading, including hydrological, and non-tidal oceanic and atmospheric loading. In Antarctica, many GPS stations show vertical motions in phase with seasonal snow accumulation changes, but these variations cannot be fully explained with snow load variations between seasons. Instead we show, for many sites in Antarctica, that a significant component of the annual cycle in vertical GPS coordinates time series may be related to snow/ice inside antennas causing as an artefact apparent seasonal variation, with litudes of up to 4 mm. We present a method based on the Empirical Mode Decomposition (EMD) algorithm to remove this artefact signal. The corrected GPS time series show an improvement in the agreement with displacements predicted by elastic modelling using GRACE-derived surface mass loads.
Publisher: Springer Science and Business Media LLC
Date: 12-2006
Publisher: American Geophysical Union (AGU)
Date: 12-09-2012
DOI: 10.1029/2012GL052559
Publisher: American Geophysical Union (AGU)
Date: 11-2010
DOI: 10.1029/2010GL045229
Publisher: American Geophysical Union (AGU)
Date: 11-2011
DOI: 10.1029/2011GL049277
Publisher: American Geophysical Union (AGU)
Date: 08-2005
DOI: 10.1029/2004JB003390
Publisher: American Geophysical Union (AGU)
Date: 17-02-2022
DOI: 10.1029/2021GL097109
Abstract: In Antarctica, Global Positioning System (GPS) vertical time series exhibit non‐linear signals over a wide range of temporal scales. To explain these non‐linearities, a number of hypotheses have been proposed, among them the short‐term rapid solid Earth response to contemporaneous ice mass change. Here we use GPS vertical time series to reveal the solid Earth response to variations in surface mass balance (SMB) in the Southern Antarctic Peninsula (SAP). At four locations in the SAP we show that interannual variations of SMB anomalies cause measurable elastic deformation. We use regional climate model SMB products to calculate the induced displacement assuming a perfectly elastic Earth. Our results show a reduction of the misfit when fitting a linear trend to GPS time series corrected for the elastic response to SMB variations. Our results imply that, for a better understanding of the glacial isostatic adjustment signal in Antarctica, SMB variability must be considered.
Publisher: Oxford University Press (OUP)
Date: 07-2006
Publisher: American Geophysical Union (AGU)
Date: 22-02-2011
DOI: 10.1029/2010JD013889
Publisher: Elsevier BV
Date: 07-2014
Publisher: American Geophysical Union (AGU)
Date: 02-2008
DOI: 10.1029/2007GL032252
Publisher: Oxford University Press (OUP)
Date: 05-02-2016
DOI: 10.1093/GJI/GGV532
Publisher: American Geophysical Union (AGU)
Date: 02-2016
DOI: 10.1002/2015JF003550
Publisher: American Geophysical Union (AGU)
Date: 15-06-2011
DOI: 10.1029/2011JC006949
Publisher: American Geophysical Union (AGU)
Date: 08-2004
DOI: 10.1029/2004GL020588
Location: United States of America
Location: United States of America
Location: United Kingdom of Great Britain and Northern Ireland
Location: United States of America
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2009
End Date: 2015
Funder: NERC, ESRC & DFID
View Funded ActivityStart Date: 2007
End Date: 2010
Funder: NERC, ESRC & DFID
View Funded ActivityStart Date: 2006
End Date: 2010
Funder: NERC, ESRC & DFID
View Funded ActivityStart Date: 2014
End Date: 2019
Funder: NERC, ESRC & DFID
View Funded ActivityStart Date: 2007
End Date: 2011
Funder: NERC, ESRC & DFID
View Funded ActivityStart Date: 2008
End Date: 2014
Funder: NERC, ESRC & DFID
View Funded Activity