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You searched for subject:(iodine oxides). Showing records 1 – 3 of 3 total matches.

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University of Florida

1. Bhattacharjee, Tapomoy. Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field.

Degree: MS, Chemical Engineering, 2014, University of Florida

Iron oxide magnetic nanoparticles have the capacity to dissipate the energy of an alternating magnetic field (AMF) in the form of heat. Heat is generated either due to Brownian relaxation, i.e., due to physical rotation of particles under AMF or due to Neel Relaxation, i.e., rotation of magnetic dipole only. This physical property can be used effectively for inducing local heating phenomena. Enzymes can be inactivated by inducing heat energy. Here the objective was to inactivate an enzyme using the benefit of local heating phenomena. Iron oxide nanoparticles synthesized by the co-precipitation of Ferric Chloride and Ferrous Chloride were used. Particle sizes were characterized using Dynamic Light Scattering (DLS). Relaxation properties of the nanoparticles were determined by AC susceptibility measurements. alpha-Amylase and beta-Galactosidase from Aspergillus Oryzae were used for heat inactivation study. Both alpha-Amylase and beta-Galactosidase were covalently conjugated to Iron Oxide nanoparticles. Conjugates were separated and washed. Remote inactivation studies were conducted under a magnetic field of 33.7 kA/m at a frequency of 255 kHz. Activity of alpha-Amylase was measured using starch iodine assay at 618 nm. Activity of beta-Galactosidase was measured using ONPG assay at 420 nm. Experiments done throughout this study confirms that both the enzymes are bound to the surface of Iron Oxide nanoparticles. Iron Oxide nanoparticles have also shown heat dissipation in presence of an AMF. Conjugated particles were washed properly and no presence of free enzyme was ensured. Activity of the conjugated particles, in case of both the enzymes, were measure at different temperatures with external heating. It was observed that enzyme bound to the IO nanoparticle can be inactivated by external heating. However, when placed under AMF, both the enzymes conjugated to IO nanoparticles, did not show any significant inactivation. Inference that can be drawn that local heating due to IO nanoparticles under AMF was not sufficient to inactivate the enzymes. ( en ) Advisors/Committee Members: RINALDI,CARLOS (committee chair).

Subjects/Keywords: Alpha particles; Enzymes; Iodine; Iron oxides; Magnetic fields; Magnetism; Magnets; Nanoparticles; Starches; Temperature control; amf  – enzymes  – nanoparticle  – superparamagnetic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bhattacharjee, T. (2014). Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0046842

Chicago Manual of Style (16th Edition):

Bhattacharjee, Tapomoy. “Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field.” 2014. Masters Thesis, University of Florida. Accessed July 09, 2020. https://ufdc.ufl.edu/UFE0046842.

MLA Handbook (7th Edition):

Bhattacharjee, Tapomoy. “Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field.” 2014. Web. 09 Jul 2020.

Vancouver:

Bhattacharjee T. Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field. [Internet] [Masters thesis]. University of Florida; 2014. [cited 2020 Jul 09]. Available from: https://ufdc.ufl.edu/UFE0046842.

Council of Science Editors:

Bhattacharjee T. Activity Measurements of Enzymes Conjugated to Superparamagnetic Iron Oxide Nanoparticles under an Alternating Magnetic Field. [Masters Thesis]. University of Florida; 2014. Available from: https://ufdc.ufl.edu/UFE0046842

2. Zhang, Shaoliang. Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France).

Degree: Docteur es, Environnement et Santé, 2012, Aix Marseille Université

Dans le cadre des recherches menées dans le domaine de la sûreté des réacteurs nucléaires, la problématique de la formation des oxydes d'iode dans l'enceinte de confinement par la destruction d'iodures organiques lors d'un accident grave a été étudiée avec les moyens du domaine de la chimie atmosphérique.La cinétique de destruction d'iodures organiques (tels que CH3I, CH2I2, CHI3, C2H5I, n-C3H7I et i-C3H7I) par les radicaux OH et O a d'abord été étudiée avec un système de Photolyse Flash – Résonance Fluorescente, dans des conditions représentatives de l'enceinte d'un accident de réacteur nucléaire accidenté. Des constantes cinétiques et leurs énergies d'activation ont été déterminées, dont certaines pour la première fois dans la littérature. Les mécanismes d'oxydation par OH et O des iodures organiques sont soit par abstraction d'un atome d'hydrogène, soit par la formation d'un complexe, menant à l'arrachement de l'atome d'iode. Ensuite, une analyse avec le code IODAIR a permis de réactualiser certaines cinétiques et de compléter ce code avec l'ajout de nouvelles réactions publiées récemment. Une comparaison de la cinétique globale de destruction de CH3I par OH et O dans le code IODAIR et de la constante cinétique globale inclue dans le code ASTEC/IODE a mis en évidence une différence d'un facteur environ 2, ce qui montre l'influence de ces deux radicaux (et principalement de O) sur la destruction des iodures organiques. L'autre voie de destruction majoritaire serait par rayonnement électronique. Les autres radicaux comme H ou N ne contribueraient que très peu à leur disparition.

Within the framework of the research in the nuclear reactor safety field, the iodine oxides formation by organic iodides destruction in the containment has been studied with the means of the atmospheric chemistry field. The destruction kinetics and their activation energy of organic iodides by OH and O radical has been quantified by a Flash Photolysis system able to monitor the oxidant radicals by resonance fluorescence. Those results have been published and some of them for the first time in the literature. The mechanisms leading to the organic iodides destruction are either by a hydrogen atom abstraction, either by the formation of a complex, depending on the organic iodide involved. Then, certain kinetics reactions have been updated in the IODAIR code. Other reactions have been added based on the recent literature available. A comparison of the kinetics destruction of CH3I by OH and O with IODAIR and the global kinetics of destruction in ASTEC/IODE showed a difference of about 2 which shows the importance of these two radicals (and mainly O) in those destruction processes. The other main path of destruction would be by electron radiation. Other radicals like H and N would not contribute significantly to organic iodides destruction. A sensitivity analysis highlighted that organic iodides would mostly be destroyed into iodine oxides with a almost complete conversion within a few hours. Finally, an atmospheric chamber has been used to…

Advisors/Committee Members: Monod, Anne (thesis director), Strekowski, Rafal (thesis director).

Subjects/Keywords: Oxydes d’iode; Iodures organiques; Irradiation; Cinétique; Aérosols; Chambre de simulation atmosphérique; Accident de réacteur nucléaire; Iodine oxides; Organic iodides; Irradiation; Kinetics; Aerosols; Atmospheric Chamber; Photolysis; Nuclear reactor accident

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zhang, S. (2012). Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France). (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2012AIXM4820

Chicago Manual of Style (16th Edition):

Zhang, Shaoliang. “Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France).” 2012. Doctoral Dissertation, Aix Marseille Université. Accessed July 09, 2020. http://www.theses.fr/2012AIXM4820.

MLA Handbook (7th Edition):

Zhang, Shaoliang. “Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France).” 2012. Web. 09 Jul 2020.

Vancouver:

Zhang S. Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France). [Internet] [Doctoral dissertation]. Aix Marseille Université 2012. [cited 2020 Jul 09]. Available from: http://www.theses.fr/2012AIXM4820.

Council of Science Editors:

Zhang S. Etudes cinétiques de l'oxydation radicalaire en phase gazeuse d'iodures organiques et de la formation de particules d'oxydes d'iode sous conditions simulées de l'enceinte d'un réacteur nucléaire en situation d'accident grave : Modelling of the Vaccarès Hydrosystem : contribution to an adaptive management of water resources in a deltaic context (Rhône delta, France). [Doctoral Dissertation]. Aix Marseille Université 2012. Available from: http://www.theses.fr/2012AIXM4820


Queensland University of Technology

3. Johnson, Graham Richard. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.

Degree: 2005, Queensland University of Technology

Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the difficulties associated with determining their composition and relating it to proposed models of the formation process. The work compared the modality of marine aerosol influencing the South-east-Queensland region with that of other environmental aerosols in the region. The aerosol was found to be consistent with marine aerosols observed elsewhere with concentrations below 1000 cm-3 and frequently exhibiting the distinct bimodal structure associated with cloud processing, consisting of an Aitken mode at approximately 40 nm, an accumulation mode in the range 100-200 nm and a coarse mode attributed to sea salt between 600 and 1200 nm. This work included the development of two new techniques for aerosol research. The first technique measures aerosol density using a combination of aerosol size distribution and gravimetric mass concentration measurements. This technique was used to measure the density of a number of submicrometer aerosols including laboratory generated NaCl aerosol and ambient aerosol. The densities for the laboratory generated aerosols were found to be similar to those for the bulk materials used to produce them. The technique, extended to super-micrometer particle size range may find application in ambient aerosol research where it could be used to discriminate between periods when the aerosol is dominated by NaCl and periods when the density is more representative of crustal material or sulfates. The technique may also prove useful in laboratory or industrial settings for investigating particle density or in case where the composition is known, morphology and porosity. The second technique developed, integrates the existing physicochemical techniques of volatilisation and hygroscopic growth analysis to investigate particle composition in terms of both the volatilisation temperatures of the chemical constituents and their contribution to particle hygroscopic behaviour. The resulting volatilisation and humidification tandem differential mobility analyser or VH-TDMA, has proven to be a valuable research tool which is being used in ongoing research. Findings of investigations relating the composition of the submicrometer marine aerosol modes to candidate models for their formation are presented. Sea salt was not found in the numerically dominant particle type in coastal nucleation mode or marine Aitken and accumulation modes examined on the Southeast…

Subjects/Keywords: Aerosol size distribution; modality; environmental aerosols; marine aerosols; aerosol density; ambient aerosol; VH-TDMA; particle hygroscopic growth; volatility; iodine oxides; non sea salt sulfate; sea salt aerosols; coastal aerosol; marine biota; algae; photolysis; photochemical; thermal decomposition; volatilisation and humidification tandem differential mobility analyser; ultra fine particles.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Johnson, G. R. (2005). The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16117/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Johnson, Graham Richard. “The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.” 2005. Thesis, Queensland University of Technology. Accessed July 09, 2020. https://eprints.qut.edu.au/16117/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Johnson, Graham Richard. “The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.” 2005. Web. 09 Jul 2020.

Vancouver:

Johnson GR. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. [Internet] [Thesis]. Queensland University of Technology; 2005. [cited 2020 Jul 09]. Available from: https://eprints.qut.edu.au/16117/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johnson GR. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. [Thesis]. Queensland University of Technology; 2005. Available from: https://eprints.qut.edu.au/16117/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.