In-Vitro Broad Band Impedance Study of a Biochemical Reaction under Nanopulses: Electrode Impedance as a Reaction Sensor

LGEP 2014 ID = 1663International audienceThis work is a first attempt to investigate the effects of ultra wideband (UWB) electromagnetic pulses upon a reaction of biological interest involved in neuronal communication, the hydrolysis of acetylcholine chloride (AChCl) catalyzed by the acetylcholine esterase enzyme (AChE). This study is based on broadband impedance measurements performed with the same cell in the range 40 Hz-4 GHz within 10s, without or with superimposed nanopulses, as a function of the elapsed time. The response above 1 MHz was assigned to the conductive and dielectric properties of the aqueous solution containing AChCl and AChE filling the cell. The response below 100 kHz was due to electrode impedance at the golden cell wall/solution interfaces. This low frequency behavior was ascribed to a dynamical adsorption-desorption process of AChCl in equilibrium with the bulk. The electrode impedance behaves as a sensor of the actual bulk concentration of AChCl when the reaction is in progress. From impedance spectra analysis it was shown that superimposed nanopulses slowed down the hydrolysis reaction, the stronger this effect the higher the pulse repetition rate. The inhibition of the reaction could be related to a lesser catalytic activity of AChE possibly through a conformational change induced by nanopulses

Photonic band gaps in complex layered arrays, Journal of Telecommunications and Information Technology, 2001, nr 4

Reflective and transmitting properties of several layers of double-periodic arrays are studied. In the arrays, elements are conducting inclusions of various shapes. It is shown that in these structures all the phenomena recently found in dense wire grids with periodical defects (so-called photonic band gap structures) can be observed and explained in simple terms of inter-layer and inclusion resonances. Frequency-selective (with two and more stop bands) and polarization transformation properties of these arrays are demonstrated

Observation et identification des mécanismes athermiques des interactions entre le champ EM hyperfréquences et des porteurs de charges. Application à des systèmes biochimiques

ID = 48

CONTRIBUTION A L'ETABLISSEMENT DE LOIS DE PREVISIONS DU COMPORTEMENT ELECTROMAGNETIQUE DE MATERIAUX COMPOSITES (APPLICATIONS DE PROTOCOLES DE CARACTERISATION DIELECTRIQUE (1MHZ-18GHZ) A DES MATERIAUX HETEROGENES ET ANISOTROPES D'ORIGINE INDUSTRIELLE. DETERMINATION DES PERMITTIVITES INTRINSEQUES)

PARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF

Mesure de l'évolution de réactions biochimiques sous traitement microonde en milieu confiné à l'aide de spectroscopie diélectrique

ID = 48

Contribution à l'étude d'une réaction chimique biologique par caractérisation diélectrique large bande

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