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MAO-B-triggered reaction for an optical triple-signal assay and AND logic gate application based on PEI-functionalized silver nanoparticles.
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School of Pharmacy, Lanzhou University, Lanzhou, 730000, P. R. China.
A novel analytical method was designed and developed that exhibited ultraviolet-visible (UV-Vis), fluorescence (FL), and resonance Rayleigh scattering (RRS) signals for straightforward and comprehensive determination of monoamine oxidase B (MAO-B) using polyethylenimine-functionalized silver nanoparticles (PEI-Ag NPs). Through a facile one-step experiment, and NaOH assisted, in an aqueous solution of 100 ℃ for 40 min PEI reacted with AgNO to generate PEI-Ag NPs with a yellow color and weak blue fluorescence. Interestingly, phenylacetaldehyde (PAA), a specific product of MAO-B, causes significant enhancement of the three optical signals of UV-Vis, FL, and RRS.
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From the second half of the nineteenth-century treatment of "imbecile" children in Britain underwent significant change. Examining the period from 1870 to 1920 when imbecility became a discrete category, and a matter of concern in policy and practice, this paper focuses on conceptualizations around fright, idleness, morality, and parental mental state as behavioral, emotional, and psychological causes and attributions of "imbecility" in children. I view this in light of the Victorian emotional culture of "care and control," which was driven by a shift in cost-cutting and fear of the impact of "imbecile children" on society, justifying exclusions, defining boundaries, and driving change.
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