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      BIOSSENSORIAMENTO ESTOCÁSTICO VIA NANOPORO PROTEICO INDIVIDUAL NO DESENVOLVIMENTO DE FERRAMENTAS ANALÍTICAS Translated title: STOCHASTIC BIOSENSING BY A SINGLE PROTEIN NANOPORE IN THE DEVELOPMENT OF ANALYTICAL TOOLS

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          Translated abstract

          <p>Studies employing a single protein nanopore as a molecular recognition element in the development of analytical devices - biosensors, spectrometers, DNA sequencing - have increased considerably in the last decade. Several studies show the potential of these bionanostructures for future stochastic biosensing technology. Stochastic biosensing is an approach that relies on the observation of individual binding events between analyte molecules and a single receptor. This approach is inherent to the organisms that use a single protein nanopore as a key element to start, manage and maintain the chemical and biophysical processes of living cells. Here, we discuss alpha-toxin as a bacterial exotoxin and prototype of a protein nanopore in real-time detection and characterization of molecules in aqueous systems.</p>

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          Simple analytical expression for the peak-frequency shifts of plasmonic resonances for sensing

          We derive a closed-form expression that accurately predicts the peak frequency-shift and broadening induced by tiny perturbations of plasmonic nanoresonators without critically relying on repeated electrodynamic simulations of the spectral response of nanoresonator for various locations, sizes or shapes of the perturbing objects. The force of the present approach, in comparison with other approaches of the same kind, is that the derivation is supported by a mathematical formalism based on a rigorous normalization of the resonance modes of nanoresonators consisting of lossy and dispersive materials. Accordingly, accurate predictions are obtained for a large range of nanoparticle shapes and sizes, used in various plasmonic nanosensors, even beyond the quasistatic limit. The expression gives quantitative insight, and combined with an open-source code, provides accurate and fast predictions that are ideally suited for preliminary designs or for interpretation of experimental data. It is also valid for photonic resonators with large mode volumes.
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            Probing quantum confinement within single core-multishell nanowires

            Theoretically core-multishell nanowires under a cross-section of hexagonal geometry should exhibit peculiar confinement effects. Using a hard X-ray nanobeam, here we show experimental evidence for carrier localization phenomena at the hexagon corners by combining synchrotron excited optical luminescence with simultaneous X-ray fluorescence spectroscopy. Applied to single coaxial n-GaN/InGaN multiquantum-well/p-GaN nanowires, our experiment narrows the gap between optical microscopy and high-resolution X-ray imaging, and calls for further studies on the underlying mechanisms of optoelectronic nanodevices.
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              Zeta potential measurement.

              This chapter describes a method for the measurement of the electrostatic potential at the electrical double layer surrounding a nanoparticle in solution. This is referred to as the zeta potential. Nanoparticles with a zeta potential between -10 and +10 mV are considered approximately neutral, while nanoparticles with zeta potentials of greater than +30 mV or less than -30 mV are considered strongly cationic and strongly anionic, respectively. Since most cellular membranes are negatively charged, zeta potential can affect a nanoparticle's tendency to permeate membranes, with cationic particles generally displaying more toxicity associated with cell wall disruption. This technique is demonstrated for two types of nanoparticles commonly used in biological applications: colloidal gold (strongly anionic) and amine-terminated PAMAM dendrimer (strongly cationic).
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                qn
                Química Nova
                Quím. Nova
                Sociedade Brasileira de Química (São Paulo )
                1678-7064
                July 2015
                : 38
                : 6
                : 817-827
                Affiliations
                [1 ] Universidade Federal de Pernambuco Brazil
                Article
                S0100-40422015000600817
                10.5935/0100-4042.20150073
                dd4a288e-ace5-43da-8b8d-d612c5f70ef9

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-4042&lng=en
                Categories
                CHEMISTRY, MULTIDISCIPLINARY

                General chemistry
                alpha-toxin,biosensor,nanopore,stochastic biosensing
                General chemistry
                alpha-toxin, biosensor, nanopore, stochastic biosensing

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