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Author: JEAN-JACQUES.. GALLET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 128
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Book Description
CE TRAVAIL EST UNE EXPLORATION DES INFORMATIONS QUE L'ON PEUT OBTENIR PAR L'ANALYSE A HAUTE RESOLUTION DE LA FLUORESCENCE X RESULTANT D'UNE EXCITATION PRODUITE PAR DU RAYONNEMENT SYNCHROTRON (LURE, ESRF). APRES DES RAPPELS SUR L'INTERACTION PHOTONS X-MATIERE, LES POSSIBILITES ATTENDUES THEORIQUEMENT LORSQUE LA FLUORESCENCE EST INDUITE PAR DES PHOTONS POLARISES OU EN RESONANCE SONT DISCUTEES. LES EVOLUTIONS DES SPECTROMETRES POUR TIRER PARTI DES SOURCES SYNCHROTRON MODERNES ET LES DISPOSITIFS D'AIMANTATION POUR LES MESURES DE DICHROISME CIRCULAIRE MAGNETIQUE (MCD) SONT DECRITS. LES PREMIERS RESULTATS DE MCD DANS L'EMISSION FE 3D 2P SONT PRESENTES ET COMPARES A DES EXPERIENCES ULTERIEURES. DES RESULTATS THEORIQUES LEUR SONT CONFRONTES POUR COMPRENDRE COMMENT LE MCD EST LIE A LA POLARISATION EN SPIN DES ETATS DE VALENCE DES ELEMENTS MAGNETIQUES. LA SELECTIVITE CHIMIQUE DU MCD EST ALORS UTILISEE POUR SONDER, POUR LA PREMIERE FOIS, LA STRUCTURE ELECTRONIQUE MAGNETIQUE DU RH DANS CO75RH25. L'EFFET DE L'HYBRIDATION SUR LE MAGNETISME EST ETUDIE PAR SUBSTITUTION DE CO (RH) PAR NI (PD). ENFIN, DES EXPERIENCES DE DIFFUSION X INELASTIQUE RESONANTE (RIXS) SUR FEF3 AU SEUIL FE 2P ET DU GADOLINIUM AU SEUIL GD 4D SONT PRESENTEES. ELLES ILLUSTRENT LES POSSIBILITES NOUVELLES OFFERTES PAR LE RIXS : L'ETAT INTERMEDIAIRE ATTEINT A PARTIR DE L'ETAT FONDAMENTAL A LA SUITE DE L'ABSORPTION DU PHOTON EST CONTROLE ET LA DESEXCITATION DE CET ETAT SE FAIT SOIT VERS L'ETAT FONDAMENTAL, SOIT VERS UN ETAT EXCITE, SOIT PAR UN EFFET RAMAN RESONANT. ON ACCEDE AINSI A DES CONFIGURATIONS QU'IL N'EST PAS POSSIBLE DE SONDER HORS RESONANCE, CE QUI EST D'UNE IMPORTANCE CRUCIALE POUR ETUDIER LES TRANSFERTS DE CHARGE ET LES EFFETS D'HYBRIDATION DANS LES SYSTEMES A ELECTRONS FORTEMENT CORRELES. LE RIXS PERMET AUSSI DE SEPARER DES VOIES D'EXCITATION DIFFERENTES : NOUS AVONS PU DISTINGUER LES CONTRIBUTIONS DIPOLAIRE ET QUADRUPOLAIRE AU SPECTRE D'ABSORPTION SM 2P EN ETUDIANT LE SPECTRE D'EMISSION 3D 2P.
Author: JEAN-JACQUES.. GALLET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 128
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Book Description
CE TRAVAIL EST UNE EXPLORATION DES INFORMATIONS QUE L'ON PEUT OBTENIR PAR L'ANALYSE A HAUTE RESOLUTION DE LA FLUORESCENCE X RESULTANT D'UNE EXCITATION PRODUITE PAR DU RAYONNEMENT SYNCHROTRON (LURE, ESRF). APRES DES RAPPELS SUR L'INTERACTION PHOTONS X-MATIERE, LES POSSIBILITES ATTENDUES THEORIQUEMENT LORSQUE LA FLUORESCENCE EST INDUITE PAR DES PHOTONS POLARISES OU EN RESONANCE SONT DISCUTEES. LES EVOLUTIONS DES SPECTROMETRES POUR TIRER PARTI DES SOURCES SYNCHROTRON MODERNES ET LES DISPOSITIFS D'AIMANTATION POUR LES MESURES DE DICHROISME CIRCULAIRE MAGNETIQUE (MCD) SONT DECRITS. LES PREMIERS RESULTATS DE MCD DANS L'EMISSION FE 3D 2P SONT PRESENTES ET COMPARES A DES EXPERIENCES ULTERIEURES. DES RESULTATS THEORIQUES LEUR SONT CONFRONTES POUR COMPRENDRE COMMENT LE MCD EST LIE A LA POLARISATION EN SPIN DES ETATS DE VALENCE DES ELEMENTS MAGNETIQUES. LA SELECTIVITE CHIMIQUE DU MCD EST ALORS UTILISEE POUR SONDER, POUR LA PREMIERE FOIS, LA STRUCTURE ELECTRONIQUE MAGNETIQUE DU RH DANS CO75RH25. L'EFFET DE L'HYBRIDATION SUR LE MAGNETISME EST ETUDIE PAR SUBSTITUTION DE CO (RH) PAR NI (PD). ENFIN, DES EXPERIENCES DE DIFFUSION X INELASTIQUE RESONANTE (RIXS) SUR FEF3 AU SEUIL FE 2P ET DU GADOLINIUM AU SEUIL GD 4D SONT PRESENTEES. ELLES ILLUSTRENT LES POSSIBILITES NOUVELLES OFFERTES PAR LE RIXS : L'ETAT INTERMEDIAIRE ATTEINT A PARTIR DE L'ETAT FONDAMENTAL A LA SUITE DE L'ABSORPTION DU PHOTON EST CONTROLE ET LA DESEXCITATION DE CET ETAT SE FAIT SOIT VERS L'ETAT FONDAMENTAL, SOIT VERS UN ETAT EXCITE, SOIT PAR UN EFFET RAMAN RESONANT. ON ACCEDE AINSI A DES CONFIGURATIONS QU'IL N'EST PAS POSSIBLE DE SONDER HORS RESONANCE, CE QUI EST D'UNE IMPORTANCE CRUCIALE POUR ETUDIER LES TRANSFERTS DE CHARGE ET LES EFFETS D'HYBRIDATION DANS LES SYSTEMES A ELECTRONS FORTEMENT CORRELES. LE RIXS PERMET AUSSI DE SEPARER DES VOIES D'EXCITATION DIFFERENTES : NOUS AVONS PU DISTINGUER LES CONTRIBUTIONS DIPOLAIRE ET QUADRUPOLAIRE AU SPECTRE D'ABSORPTION SM 2P EN ETUDIANT LE SPECTRE D'EMISSION 3D 2P.
Author: Alison Rodger
Publisher: Oxford University Press, USA
ISBN: 9780198558972
Category : Science
Languages : en
Pages : 170
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Book Description
This book provides an introduction to all those who wish to use the complementary spectroscopic techniques of optical activity (circular dichroism, CD) and optical anisotropy (linear dichroism, LD) for the study of the structure of molecules and interactions between molecules in solution. It emphasizes these techniques and how to use them for both low and high molecular weight molecules. The book begins by describing the principles behind CD and LD and how these techniques can be used in the laboratory without using advanced maths or quantum mechanics. The next chapters describe how both techniques may be applied to the study of biological macromolecules and give a detailed description of how they may be used on small molecules to investigate molecular and electronic structure. The final part contains theoretical derivations of all the equations required for the applications described previously. Specific molecular examples are used to illustrate concepts and to show the reader how to use the techniques in chemical and biological systems. Circular Dichroism and Linear Dichroism is an easy guide to what a prospective user of CD needs to know and explains how LD is not merely an exotic technique only to be practiced by experienced spectroscopists, but may be routinely and usefully employed as an aid to molecular structure determination.
Author: P.L. Polavarapu
Publisher: Elsevier
ISBN: 0444640282
Category : Science
Languages : en
Pages : 824
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Book Description
Chiral Analysis: Advances in Spectroscopy, Chromatography and Emerging Methods, Second Edition covers an important area of analytical chemistry of relevance to a wide variety of scientific professionals, including chemistry graduate students, analytical chemists, organic chemists, professionals in the pharmaceutical industry, and others with an interest in chirality and chiral analysis. This thoroughly revised second edition covers several new, important areas of chiral analysis that have emerged since the first edition. Three of the new methods provide higher sensitivity than can be realized with the current methods and are expected to become mainstream applications: cavity based methods offer vastly higher sensitivity than conventional polarimetric methods, microwave chiral detection provides unsurpassed sensitivity for identifying diastereomers, and the rotating electric field method offers a competing new approach for the separation of enantiomers. Another topic, chirality in extraterrestrial life, has not been discussed in any other book and is important for understanding the origin of life. - Offers the only book to cover both spectroscopic and separation methods in a single volume - Provides an up-to-date and detailed review of the various techniques available, including new techniques that have emerged since the first edition - Includes contributions from a range of leading experts in the field, now edited by award-winning chirality researcher Prasad Polavarapu
Author: Prasad L. Polavarapu
Publisher: CRC Press
ISBN: 1315357194
Category : Science
Languages : en
Pages : 298
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Book Description
This book details chiroptical spectroscopic methods: electronic circular dichroism (ECD), optical rotatory dispersion (ORD), vibrational circular dichroism (VCD), and vibrational Raman optical activity (VROA). For each technique, the text presents experimental methods for measurements and theoretical methods for analyzing the experimental data. It also includes a set of experiments that can be adopted for undergraduate teaching laboratories. Each chapter is written in an easy-to-follow format for novice readers, with necessary theoretical formalism in appendices for advanced readers.
Author: G.D. Fasman
Publisher: Springer Science & Business Media
ISBN: 1475725086
Category : Science
Languages : en
Pages : 739
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Book Description
''Excellent and very timely....It will undoubtedly become a standard reference for the application of circular dichroism (CD) to biomolecules.'' --- Quarterly Review of Biology, March 1997 ''[T]estament to the book's utility is the fact that during the course of my review I had to 'rescue' it from the desks of graduate students on an almost daily basis. In summary, this is a great book.'' --- American Scientist ''Well documented chapters provide a very good insight into the problems surrounding the conformation of biomacromolecules...An indispensible source of information.'' --- Nahrung, 42(2), 1998 Renowned experts present the first state-of-the-art description of circular dichroism spectroscopy (CD). Chapters present in-depth discussions of the history of the field, the theory of CD for application to globular proteins, membrane proteins, peptides, nucleic acids and their interactions, carbohydrates, and instrumentation. Discussions also feature new techniques using synchrotron radiation, vibrational Raman optical activity, and vibrational CD. More than 250 illustrations supplement the text.
Author: Bruno Jirgensons
Publisher: Springer Science & Business Media
ISBN: 3642877133
Category : Science
Languages : en
Pages : 209
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Book Description
The application of circular dichroism (CD) to various problems involving con formation of proteins and other biopolymers is emphasized in this revised and enlarged second edition. The usefulness of CD and ORD in helping to solve structural prob lems is demonstrated by many examples, and the most essential data are tabulated. The author is sincerely grateful to the editors of the series Molecular Biology, Bio chemistry and Biophysics, especially to Professor GEORG F. SPRINGER, M.D., for their interest in this edition, as well as to the many reviewers for their constructive criticism of the first edition of this book. Our previously unpublished work reported in this second edition was supported in part by grants from the R. A. Welch Foundation (grant G-051) and U.S. Public Health Service (grant CA-01785). Houston, September 1973 B. JIRGENSONS Preface to the First Edition Great advances have been made in the application of physical methods in the study of the structure of proteins and other biological macromolecules. Optical rotatory dispersion has been successful in solving structural problems, and a vast amount of literature has accumulated on this subject. Several review articles appeared between 1961 and 1965, but significant progress has been made since 1965. Important new studies, especially on the Cotton effects in the far ultraviolet spectrum, have rendered many previous publications obsolete so that a concise monograph should be useful at this time.
Author: Gábor Horváth
Publisher: Springer
ISBN: 3642547184
Category : Science
Languages : en
Pages : 652
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Book Description
This book covers advances made since the 2004 Springer volume “Polarized Light in Animal Vision” edited by Horvath and Varju, but also provides reviews and synopses of some areas. Part I examines polarization sensitivity across many animal taxa including vertebrates and invertebrates and details both terrestrial and aquatic life. Part II is devoted to the description of polarized light in nature and explores how the physics of light must be taken into account when understanding how polarized light is detected by the visual system. This includes underwater polarization due to scattering; polarization patterns reflected from freshwater bodies; polarization characteristics of forest canopies; normal and anomalous polarization patterns of the skies; skylight polarization transmitted through Snell’s window and both linearly and circularly polarized signals produced by terrestrial and aquatic animals. This Part also examines polarized “light pollution” induced by anthropogenic factors such as reflection off asphalt surfaces, glass panes, car bodies, and other man-made structures that are now known to form ecological traps for polarotactic insects. Part III surveys some of the practical applications of polarization vision including polarization-based traps for biting insects, ground-based polarimetric cloud detectors and an historical examination of the navigational abilities of Viking seafarers using the sky polarization compass. The deterrent qualities of ungulate pelage to polarization-sensitive biting insects is also examined in this section.
Author:
Publisher:
ISBN:
Category : Biochemistry
Languages : en
Pages : 1324
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Book Description
Author: Bengt Nordén
Publisher: Royal Society of Chemistry
ISBN: 1788018214
Category : Science
Languages : en
Pages : 305
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Book Description
This book provides an introduction to optical anisotropy (linear dichroism, LD) and optical activity (circular dichroism, CD) as techniques for the study of structures and interactions of molecules in solution. The book covers the use of these techniques for both small and large molecular systems with particular emphasis being placed on proteins and nucleic acids. CD is a well-established technique and this book aims to explain how it can be used simply and effectively for new entrants to the field as well as covering more advanced techniques for experts. LD is often seen as a rather exotic method intended only for experienced spectroscopists. This book demonstrates that it is an approach with real utility that may be used by both students and scientists from graduate level onwards to give simple answers, which are not available from any other technique, to structural and kinetic questions. Much of the emphasis is on flow orientation of samples in solution phase. The book first describes the techniques and the information they can provide; it then goes on to give specific details on how to actually implement them, including a wide range of examples showing how LD and CD can help with * protein and nucleic acid secondary structure elucidation; * analysis of the formation and rearrangements of fibrous proteins and membrane proteins; * identification of the absolute configuration of small molecules; * determination of the orientation of small molecules in anisotropic media; * assignment of transition moment polarizations; * investigation of binding strengths and geometries of ligand-macromolecule complexes; * 3-D structure determination from LD, molecular replacement and MD modeling. The advantages of combined LD/CD studies are also outlined with examples of DNA/drug complexes and protein insertion into membranes. Taken together the book represents a comprehensive text on the theory and application of LD and CD in the chemical and biological sciences.
Author: Kenneth W. Busch
Publisher: Elsevier
ISBN: 0080469280
Category : Science
Languages : en
Pages : 721
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Book Description
Chiral Analysis covers an important area of analytical chemistry of relevance to a wide variety of scientific professionals. The target audience is scientific professionals with an undergraduate background in chemistry or a related discipline, specifically organic chemists, researchers in drug discovery, pharmaceutical researchers involved with process analysis or combinatorial libraries, and graduate students in chemistry. Chapters have been written with the nonspecialist in mind so as to be self-contained.* Broad coverage - spectroscopic and separation methods covered in a single volume* Up-to-date and detailed review of the various techniques available and/or under development in this field* Contributions from leading experts in the field
