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Assembly of Amyloid beta (Aβ) peptides, in particular Aβ-42 is central to the formation of the amyloid plaques associated with neuro-pathologies such as Alzheimer’s disease (AD). Molecular assembly of individual Aβ-42 species was observed using a simple fluorescence microscope. From the molecular movements (aka Brownian motion) of the individual peptide assemblies, we calculated a temporal evolution...
A sensitive optical method based on quantum dot (QD) technology is demonstrated for the detection of an important cancer marker, total prostate-specific antigen (TPSA) on a disposable carbon substrate surface. Immuno-recognition was carried out on a carbon substrate using a sandwich assay approach, where the primary antibody (Ab)-protein A complex covalently bound to the substrate surface, was allowed...
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