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Browsing by Author "Perkins, William T."

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The application of ICP-MS methods to tephrochronological problems

Pearce, Nicholas J. G.; Perkins, William T.; Westgate, John A.; Preece, S. J. (2004-03)

The accurate recognition of tephra deposits is of great value to Earth scientists because they facilitate stratigraphic correlation. The most useful tephra deposits form from violent volcanic eruptions; they are isochronous ...
Bioadsorption in remediation of metal mine drainage: The use of dealginated seaweed in the BIOMAN project

Pearce, Nicholas J. G.; Dinelli, E.; Hartley, Suzanne; Sandlands, L.; Perkins, William T.; Edyvean, R. (2006)

Dealginated seaweed (DS) is a waste product from the industrial extraction of alginates. Dealginated seaweed has ion exchange properties which can be exploited to remove potentially harmful elements (PHEs) from aqueous ...
Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America

Westgate, John A.; Preece, S. J.; Froese, Duane G.; Pearce, Nicholas J. G.; Roberts, R. G.; Demuro, M.; Hart, W. K.; Perkins, William T. (2008-02)

Sheep Creek tephra (SCt) consists of inflated, rhyolitic pumice with abundant plagioclase and hornblende, lesser amounts of ferrian ilmenite and magnetite, and trace quantities of basaltic hornblende, augite, quartz, ...
Copper deficiency in potato dextrose agar causes reduced pigmentation in cultures of various fungi

Griffith, Garth W.; Easton, Gary L.; Detheridge, Andrew; Roderick, Kevin; Edwards, Arwyn; Worgan, Hilary J.; Nicholson, Jean; Perkins, William T. (2007-11)

Potato dextrose agar (PDA) is one of the most commonly used media for the isolation and cultivation of fungi, with morphological features and pigmentation in culture often being important for identification of cultures. ...
Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP-MS analyses: current status and future potential

Westgate, John A.; Denton, Joanna S.; Perkins, William T.; Pearce, Nicholas J. G. (2007)

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a high spatial resolution analytical method which has been applied to the analysis of silicic tephras. With current instrumentation, around 30 trace ...
Gold Run tephra: a Middle Pleistocene stratigraphic and paleoenviromental marker across west-central Yukon Territory, Canada

Westgate, John A.; Preece, S. J.; Froese, Duane G.; Telka, A. M.; Storer, J. E.; Pearce, Nicholas J. G.; Enkin, R. J.; Jackson, L. E.; LeBarge, W.; Perkins, William T. (2009-06-01)

Gold Run tephra has been found at Thistle Creek, Sixtymile River, and the Klondike goldfields of west-central Yukon, Canada. It is a hornblende-bearing rhyolitic tephra with thicknesses of up to 10 cm at each site, suggesting ...
Laboratory studies using naturally occurring 'green rust' to aid metal mine water remediation

Bearcock, Jenny M.; Perkins, William T.; Pearce, Nicholas J. G. (2011-06-15)

Green rust, an Fe (II) and (III) oxyhydroxy salt, can alter the aqueous oxidation state, mobility and toxicity, of inorganic contaminants and thus could have applications in water treatment. This paper discusses a series ...
Microbial diversity and activity are increased by compost amendment of metal-contaminated soil

Farrell, Mark; Griffith, Gareth W.; Hobbs, Phil J.; Perkins, William T.; Jones, Davey L. (2010-01)

Unlike organic pollutants, heavy metals cannot be degraded and can constitute a persistent environmental hazard. Here, we investigated the success of different remediation strategies in promoting microbial diversity and ...
Possible interactions between bacterial diversity, microbial activity and supraglacial hydrology of cryoconite holes in Svalbard

Edwards, Arwyn; Anesio, Alexandre M.; Rassner, Sara M.; Sattler, Birgit; Hubbard, Bryn; Perkins, William T.; Young, Michael; Griffith, Gareth W. (2011-01-01)

The diversity of highly active bacterial communities in cryoconite holes on three Arctic glaciers in Svalbard was investigated using terminal restriction fragment length polymorphism (T-RFLP) of the 16S rRNA locus. ...
Trace-element composition of single glass shards in distal Minoan tephra from SW Turkey

Perkins, William T.; Pearce, Nicholas J. G.; Eastwood, W. J.; Westgate, John A. (2002)

Volcanic glass from the seventeenth century BC (c. 3600 BP) Minoan eruption of Santorini (Thera) has been recovered from a 4 cm thick tephra deposit at Gölhisar Gölü, a small lake in SW Turkey. Analysis of single grains ...

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