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

Пространственный компонент в структуре глаголов физического действия

Цель данной статьи – определить роль пространственного компонента в семантической структуре глаголов физического действия

Proposal for Quantum Simulation via All-Optically Generated Tensor Network States

We devise an all-optical scheme for the generation of entangled multimode photonic states encoded in temporal modes of light. The scheme employs a nonlinear down-conversion process in an optical loop to generate one- and higher-dimensional tensor network states of light. We illustrate the principle with the generation of two different classes of entangled tensor network states and report on a variational algorithm to simulate the ground-state physics of many-body systems. We demonstrate that state-of-the-art optical devices are capable of determining the ground-state properties of the spin-1/2 Heisenberg model. Finally, implementations of the scheme are demonstrated to be robust against realistic losses and mode mismatch.Comment: 6 pages main text plus 6 pages Supplementary Material and many figures. Updated to published version. Comments welcom

Efectos de la aplicación de plasma frío atmosférico sobre la composición química del vino

47 p.A la fecha, varios estudios han reportado que la aplicación de plasma frío atmosférico (PFA) podría contribuir a asegurar la inocuidad de algunos alimentos. Sin embargo, aún se requieren más investigaciones sobre los cambios que provoca a nivel químico y organoléptico en el vino. En el presente estudio se buscó evaluar algunos de los cambios químicos provocados por la aplicación de PFA en un vino de variedad Carmenere. Los tratamientos consideraron variaciones en el tiempo de aplicación de PFA con lapsos de 0; 0,5; 1 y 3 minutos sobre volúmenes de muestra de 20 mL de vino. Los resultados indicaron que para el caso de los sólidos solubles y acidez real (pH) se produjeron disminuciones significativas en su concentración, en cambio la acidez titulable, la concentración de fenoles, y las variables cromáticas mostraron aumentos significativos para algunos de los tratamientos. Adicionalmente, y como una forma de evaluar si los efectos observados se debieron a la evaporación de parte de las muestras de vino por efecto del flujo de aire del PFA, se realizó un experimento donde las muestras fueron expuestas sólo al flujo de aire del instrumento. En este caso, se observaron resultados con la misma tendencia, pero con una menor significancia estadística, por lo que se pudo concluir que el PFA puede generar cambios significativos en la composición química del vino Carmenere. Adicionalmente, se recomienda realizar más estudios para determinar el comportamiento de los resultados en un periodo de tiempo más prolongado. // ABSTRACT: Currently, several studies have found that the application of atmospheric cold plasma (PFA) could contribute to improve the safety of some foods. However, more research is needed on the chemical and organoleptic changes it causes in wine. The present study aimed to evaluate some of the chemical changes caused by the application of PFA in a Carménère variety wine. The treatments considered variations in the time of application of PFA with lapses of 0, 0.5, 1 and 3 minutes on sample volumes of 20 mL of wine. The results indicated that in the case of soluble solids and real acidity (pH) there were significant decreases in their concentration, while titratable acidity, concentration of phenols, and chromatic variables showed significant increase for some of the treatments. Additionally, and as a way to evaluate if the observed effects were due to the evaporation of part of the wine samples due to the PFA air flow, an experiment was carried out where the samples were exposed only to the instrument air flow. In this case, results with the same trend were observed but with less statistical significance, so it could be concluded that PFA can generate significant changes in the chemical composition of Carménère wine. Additionally, it is recommended to carry out more studies to determine the behavior of the results in a longer period of time

Puériculture et Sociétés, une analyse comparée de deux temporalités : La France et l’Équateur (1970-2007)

Composition du jury: Directeur de thèse : Monsieur Jean - Pierre Goubert, Maître de conférences, habilité – ÉHESS Histoire;Président du jury : Madame Elaine Pedreira Rabonovich, professeur à L’Université Catholique Pontificale de Salvador;Membres du jury : Madame Catherine Rollet, professeur émérite Université de Versailles – St - Quentin (Histoire) et Monsieur Stéphane Tessier, médecin de Santé Publique, Paris. Thèse soutenue le 14 juin 2013 Résumé Cette thèse s’est donné pour objectif de co..

Puériculture et Sociétés, une analyse comparée de deux temporalités : La France et l’Équateur (1970-2007)

Composition du jury: Directeur de thèse : Monsieur Jean - Pierre Goubert, Maître de conférences, habilité – ÉHESS Histoire;Président du jury : Madame Elaine Pedreira Rabonovich, professeur à L’Université Catholique Pontificale de Salvador;Membres du jury : Madame Catherine Rollet, professeur émérite Université de Versailles – St - Quentin (Histoire) et Monsieur Stéphane Tessier, médecin de Santé Publique, Paris. Thèse soutenue le 14 juin 2013 Résumé Cette thèse s’est donnée pour objectif de c..

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

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

ID = 48