59 Result(s)

Article

The Influence of Solvent on the Acidity and Activity of Supported Sulfonic Acid Catalysts

The acid strengths and catalytic activities of sulfonic acids supported on polystyrene resins and ordered mesoporous HMS and SBA-15 silicas are compared. Acid strengths are measured by acid–base titration calo...

S. Koujout, D.R. Brown in Catalysis Letters (2004)

Article

Application of SCTA methods for kinetic analysis of solid state reactions and synthesis of materials

E. A. Fesenko, P. A. Barnes, G. M. B. Parkes… in Journal of Thermal Analysis and Calorimetry (2003)

Article

Map** the antigenicity of copper-treated cellular prion protein with the scrapie isoform

When recombinant and cellular prion protein (PrP^C) binds copper, it acquires properties resembling the scrapie isoform (PrP^Sc), namely protease resistance, detergent insolubility and increased β sheet content. H...

B.-S. Wong, R. Li, J. Sassoon, S.-C. Kang… in Cellular and Molecular Life Sciences CMLS (2003)

Article

The Nature of the Internal Acid Solution in Sulfonated Poly(styrene-co-divinylbenzene) Resins

The acidities of a series of fully hydrated sulfonated poly(styrene-co-divinylbenzene) resins with varying levels of sulfonation from 0.80 to 5.25 mequiv g^-1 have been characterized. Enthalpies of neutralization ...

S. Koujout, B.M. Kiernan, D.R. Brown, H.G.M. Edwards, J.A. Dale… in Catalysis Letters (2003)

Article

Antireflective structures in CdTe and CdZnTe surfaces by ECR plasma etching

A rigorous coupled-wave analysis procedure has been used to design structures which can be embedded in Cd(Zn)Te surfaces to make them antireflective in the 8–14 m spectral region. Gray scale lithography was us...

A. J. Stoltz, M. R. Banish, J. H. Dinan, J. D. Benson… in Journal of Electronic Materials (2001)

Article

Acidities and catalytic activities of persulfonated poly(styrene-co-divinylbenzene) ion-exchange resins

A series of macroporous sulfonated poly(styrene-co-divinylbenzene) ion-exchange resins with varying levels of sulfonation have been prepared. The acidities of these resins have been measured calorimetrically b...

M. Hart, G. Fuller, D.R. Brown, C. Park, M.A. Keane, J.A. Dale… in Catalysis Letters (2001)

Chapter

Neurotoxicity but not infectivity of prion proteins can be induced reversibly in vitro

Prion diseases include Creutzfeldt-Jakob disease in humans, scrapie in sheep and bovine spongiform encephalopathy. The hallmark of prion diseases is the accumulation of an abnormal isoform (PrP^Sc) of the cellular...

K. Post, D. R. Brown, M. Groschup, H. A. Kretzschmar, D. Riesner in Prion Diseases (2000)

Article

Mesoporous solid acid catalysts: relationship between amine TPD data and catalytic activities

The concentrations of surface acid sites on Al³⁺- and H⁺-exchanged AlMCM-41 catalysts have been measured by temperature-programmed desorption (TPD) of a series of primary, secondary and tertiary amines, and by ad...

H.H.P. Yiu, D.R. Brown, P.A. Barnes in Catalysis Letters (1999)

Article

Lewis and Brønsted acid catalysis with AlMCM-41 and AlMMS: dependence on exchange cation

Mesoporous solid acid catalysts based on AlMCM-41 and AlMMS have been prepared. The two catalysts exhibit similar unidimensional pore structures with hexagonal symmetries. AlMMS shows less long-range order tha...

H.H.P. Yiu, D.R. Brown in Catalysis Letters (1998)

Article

Brønsted and Lewis acid catalysis with ion- exchanged clays

An acid-treated montmorillonite clay has been ion-exchanged with Al³⁺, Fe³⁺, Cu²⁺, Zn²⁺, Ni²⁺, Co²⁺ and Na⁺. The catalytic activities of these materials have been measured in the Brønsted acid catalysed rearrange...

D.R. Brown, C.N. Rhodes in Catalysis Letters (1997)

Chapter and Conference Paper

Cell death in prion disease

Prion diseases are neurodegenerative transmissible diseases. The infectious agent, termed prion, is thought to consist of an altered host-encoded protein. The pathogenesis of these diseases which typically in ...

Prof. Dr. H. A. Ketzschmar, A. Giese… in Advances in Research on Neurodegeneration (1997)

Article

Comparison of AlEt₂Cl and ZnCl₂ supported on silica gel as catalysts of Diels-Alder reactions. Influence of the nature of the dienophile

Non-modified silica gel, silica gel treated with AlEt₂Cl, and ZnCl₂ supported on silica gel are tested as catalysts in the Diels-Alder reactions of cyclopentadiene (1) with methyl acrylate (2a), (-) -menthyl acry...

J. I. García, J. A. Mayoral, E. Pires, D. R. Brown, J. Massam in Catalysis Letters (1996)

Article

A case study of the natural attenuation of gas condensate hydrocarbons in soil and groundwater

Condensate liquids have been found to contaminate soil and groundwater at two gas production sites in the Denver Basin operated by Amoco Production Co. These sites have been closely monitored since July 1993 t...

Gary W. Barker, Kevin T. Raterman… in Applied Biochemistry and Biotechnology (1996)

Chapter

A Case Study of the Natural Attenuation of Gas Condensate Hydrocarbons in Soil and Groundwater

Condensate liquids have been found to contaminate soil and groundwater at two gas production sites in the Denver Basin operated by Amoco Production Co. These sites have been closely monitored since July 1993 t...

Gary W. Barker, Kevin T. Raterman… in Seventeenth Symposium on Biotechnology for… (1996)

Article

An analogue vector matching architecture

A two transistor analogue circuit is described which exploits the native device characteristics of a MOSFET to calculate the square of the Euclidean distance between two points. Simulations suggest that this c...

S. Collins, D. R. Brown, G. F. Marshall in Analog Integrated Circuits and Signal Processing (1995)

Article

The roles of BrØnsted and Lewis surface acid sites in acid-treated montmorillonite supported ZnCl₂ alkylation catalysts

The catalyst known as “clayzic” (ZnCl₂ supported on acid-treated montmorillonite) exhibits both BrØnsted and Lewis surface acidities. The relative catalytic activities of these two types of acid site have been de...

J. Massam, D. R. Brown in Catalysis Letters (1995)

Chapter

Gene therapy for the genetic dyslipoproteinaemias

Over the past two decades the roles of apolipoproteins, enzymes, lipoprotein receptors, and transfer proteins in lipoprotein metabolism have been elucidated. This new information provides a conceptual framewor...

H. B. Brewer Jr, D. R. Brown, V. S. Kashyap… in HDL Deficiency and Atherosclerosis (1995)

Article

Catalytic activity of acid-treated montmorillonite in polar and non-polar reaction media

The catalytic activity of acid-treated montmorillonite clay towards Brønsted acid catalysed reactions is shown to be highly dependent on the degree of acid treatment received by the clay. Using two contrasting...

C. N. Rhodes, D. R. Brown in Catalysis Letters (1994)