Download or read book Etude de la fluorescence des mol cules H2O et D2O sous l effet d une excitation 2 photons dans des gazs et 1 photon dans des agr gats written by Franck Edery and published by . This book was released on 2004 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Résumé français] La spectroscopie de fluorescence de molécules d'eau dans un environnement gazeux et confinées dans des agrégats de gaz rares a été étudiée. Le peuplement des états excités nécessite une énergie supérieure à 10 eV. Nous avons peuplé ces états par 2 photons laser et par 1 photon du rayonnement synchroton. L'objectif est l'approche de mesures in situ de températures d'un milieu fluide sous pression par la méthode de Fluorescence Induite par Laser (FIL). Nous avons développé une installation laser automatisée pour les études de fluorescence sous pression de 0 à 200 bar. Pour la première fois, les spectres d'excitation à 2 photons C(v' = 0, J'kakc) X(v'' = 0, J''kakc) des molécules H2O et D2O ont pu être mesurés entre 245 et 250 nm. Les résultats expérimentaux ont été confrontés à nos calculs théoriques des spectres. Nous avons comparé des modèles tenant compte des couplages électroniques homogènes et hétérogènes, ainsi que de l'ionisation des molécules par le laser. Nous avons observé de nouveaux complexes collisionnels sous des pressions d'azote supérieures à 5 bar. Nous les avons provisoirement attribués à des hydrates en phase solide, stabilisés par des liaisons OH(OD). Les agrégats multicouches de gaz rares (He, Ne, Ar), dopés par des molécules d'eau ont été créés par la technique des jets croisés (Hasylab, Desy). Nous avons observé pour la première fois l'effet de la suppression de la voie d'ionisation de H2O(D2O) à l'intérieur d'un agrégat d'hélium. Nous avons montré que les agrégats de néon solvatent efficacement les molécules d'eau en les thermalisant, sans perturber leur structure électronique. Dans les agrégats d'argon, nous avons observé "l'effet de cage" sur la prédissociation de H2O(D2O). Il conduit à la recombinaison du fragment rapide H/D avec OH(A)/OD(A). Nous avons constaté un effet isotopique, entre H2O et D2O, sur la taille critique d'une cage. Cette étude modèle débouche sur une application de mesures FIL in situ dans un fluide suoercritique en expansion.
Download or read book New Trends in Fluorescence Spectroscopy written by Bernard Valeur and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first volume in the new Springer Series on Fluorescence brings together fundamental and applied research from this highly interdisciplinary and field, ranging from chemistry and physics to biology and medicine. Special attention is given to supramolecular systems, sensor applications, confocal microscopy and protein-protein interactions. This carefully edited collection of articles is an invaluable tool for practitioners and novices.
Download or read book Analysis and Application of the Fast Chl a Fluorescence OJIP Transient Complemented with Simultaneous 820 Nm Transmission Measurements written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans le domaine de la recherche de la photosynthèse, la cinétique de la fluorescence de la chlorophylle (OJIP) est une des méthodes les plus courantes. Cette méthode très sensible permet de mesurer "in vivo" l'activité photosynthétique. Cependant, il subsiste plusieurs questions fondamentales concernant son interprétation. Dans cette thèse, nous avons démontré que la cinétique OJIP reflète la réduction de la chaîne de transfert d'électrons et que ses étapes intermédiaires expriment les étapes déterminantes lors du transfert d'électrons. Le deuxième but de cette thèse était d'étendre l'applicabilité de la cinétique OJIP. Un modèle, décrivant la régénération de l'activité photosynthétique après un stress de chaleur, a été créé. Nous avons aussi montré que des donneurs d'électrons alternatifs existent et qu'ils fonctionnent quand le côté donneur du photosystème II est détruit. Nous avons également développé une méthode pour déterminer l'état redox du pool de plastoquinone.
Download or read book Isotopes in the Water Cycle written by Pradeep K. Aggarwal and published by Springer Science & Business Media. This book was released on 2006-01-16 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental isotope and nuclear techniques provide unmatched insights into the processes governing the water cycle and its variability. This monograph presents state of the art applications and new developments of isotopes in hydrology, environmental disciplines and climate change studies. Coverage ranges from the assessment of groundwater resources in terms of recharge and flow regime to studies of the past and present global environmental and climate changes.
Download or read book Analysis and Application of the Fast Chl a Fluorescence OJIP Transient Complemented with Simultaneous 820 Nm Transmission Measurements written by Szilvia Zita Tóth and published by . This book was released on 2006 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans le domaine de la recherche de la photosynthèse, la cinétique de la fluorescence de la chlorophylle (OJIP) est une des méthodes les plus courantes. Cette méthode très sensible permet de mesurer "in vivo" l'activité photosynthétique. Cependant, il subsiste plusieurs questions fondamentales concernant son interprétation. Dans cette thèse, nous avons démontré que la cinétique OJIP reflète la réduction de la chaîne de transfert d'électrons et que ses étapes intermédiaires expriment les étapes déterminantes lors du transfert d'électrons. Le deuxième but de cette thèse était d'étendre l'applicabilité de la cinétique OJIP. Un modèle, décrivant la régénération de l'activité photosynthétique après un stress de chaleur, a été créé. Nous avons aussi montré que des donneurs d'électrons alternatifs existent et qu'ils fonctionnent quand le côté donneur du photosystème II est détruit. Nous avons également développé une méthode pour déterminer l'état redox du pool de plastoquinone.
Download or read book Biochemical Thermodynamics written by Robert A. Alberty and published by John Wiley & Sons. This book was released on 2006-03-31 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Navigate the complexities of biochemical thermodynamics with Mathematica(r) Chemical reactions are studied under the constraints of constant temperature and constant pressure; biochemical reactions are studied under the additional constraints of pH and, perhaps, pMg or free concentrations of other metal ions. As more intensive variables are specified, more thermodynamic properties of a system are defined, and the equations that represent thermodynamic properties as a function of independent variables become more complicated. This sequel to Robert Alberty's popular Thermodynamics of Biochemical Reactions describes how researchers will find Mathematica(r) a simple and elegant tool, which makes it possible to perform complex calculations that would previously have been impractical. Biochemical Thermodynamics: Applications of Mathematica(r) provides a comprehensive and rigorous treatment of biochemical thermodynamics using Mathematica(r) to practically resolve thermodynamic issues. Topics covered include: * Thermodynamics of the dissociation of weak acids * Apparent equilibrium constants * Biochemical reactions at specified temperatures and various pHs * Uses of matrices in biochemical thermodynamics * Oxidoreductase, transferase, hydrolase, and lyase reactions * Reactions at 298.15K * Thermodynamics of the binding of ligands by proteins * Calorimetry of biochemical reactions Because Mathematica(r) allows the intermingling of text and calculations, this book has been written in Mathematica(r) and includes a CD-ROM containing the entire book along with macros that help scientists and engineers solve their particular problems.
Download or read book Atoms written by Jean Perrin and published by Franklin Classics. This book was released on 1916 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forest Products Biotechnology written by Alan Bruce and published by CRC Press. This book was released on 2002-09-10 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industries are developing radical, new biotechnology processes to expand and develop their range of products that originate from the world's forests. As a result of the growing understanding of the process involved, biotechnology is also helping reduce any adverse impact on the environment.; This book presents a review of specialist research directed towards efficient and environmentally sensitive use of forests. An introductory chapter explaining the structure and anatomy of wood is followed by a chapter-by-chapter review of the most current developments on individual topics associated with a wide range of forest products such as timber, trees, pulp and paper, drugs and valuable chemicals. In addition, chapters focus on the ways of resolving some of the environmental problems faced by these industries.
Download or read book Yvain written by Chretien de Troyes and published by Yale University Press. This book was released on 1987-09-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A twelfth-century poem by the creator of the Arthurian romance describes the courageous exploits and triumphs of a brave lord who tries to win back his deserted wife's love
Download or read book Duty and Desire Book Club Edition written by Anju Gattani and published by . This book was released on 2021-01-27 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: To uphold family honor and tradition, Sheetal Prasad is forced to forsake the man she loves and marry playboy millionaire Rakesh Dhanraj while the citizens of Raigun, India, watch in envy. On her wedding night, however, Sheetal quickly learns that the stranger she married is as cold as the marble floors of the Dhanraj mansion. Forced to smile at family members and cameras and pretend there's nothing wrong with her marriage, Sheetal begins to discover that the family she married into harbors secrets, lies and deceptions powerful enough to tear apart her world. With no one to rely on and no escape, Sheetal must ally with her husband in an attempt to protect her infant son from the tyranny of his family.sion.
Download or read book Modern Fluorescence Spectroscopy written by Earl Wehry and published by Springer. This book was released on 1976-06 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principles of fluorescence spectroscopy are by now well established, and, after a rather lengthy gestation period, the technique is now routinely applied to a broad spectrum of problems, ranging from mechanistic photo chemistry to chemical analyses in biomedical and environmental systems to probes of structure and function in biological macromolecules. Phosphor escence spectrometry and chemiluminescence are also well-known tech niques; they are somewhat less well established than fluorescence (at least in analytical chemistry), but they too are receiving greatly increased appli cation to both laboratory and "real" problems. This is not to imply that luminescence spectroscopy, viewed in its broadest sense, is a static field. In fact, recent advances in instrumentation make it feasible to apply fluorescence to problem areas in which its use five years ago would have been unthinkable. Advances in hardware generate advances in application, and very significant progress is being recorded in the application of fluorescence (and its close relatives, phosphorescence and chemiluminescence) in the biochemical, biomedical, and environmental spheres.
Download or read book Isotope Techniques in Hydrology written by International Atomic Energy Agency and published by . This book was released on 1968 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book I Have a Dog written by Charlotte Lance and published by Allen & Unwin. This book was released on 2014-05-01 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: I have a dog. An inconvenient dog. When I wake up, my dog is inconvenient. When I'm getting dressed, my dog is inconvenient. And when I'm making tunnels, my dog is SUPER inconvenient. But sometimes, an inconvenient dog can be big and warm and cuddly. Sometimes, an inconvenient dog can be the most comforting friend in the whole wide world.
Download or read book Elemental Analysis of Biological Materials written by and published by Bernan Press(PA). This book was released on 1980 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charles Pettigrew First Bishop elect of the North Carolina Episcopal Church written by Bennett H Wall and published by Hassell Street Press. This book was released on 2021-09-10 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
