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Distance Measurements In Biological Systems By Epr

Author : Lawrence J. Berliner
ISBN : 9780306471094
Genre : Medical
File Size : 84. 76 MB
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Distance measurements in biological systems by EPR The foundation for understanding function and dynamics of biological systems is knowledge of their structure. Many experimental methodologies are used for determination of structure, each with special utility. Volumes in this series on Biological Magnetic Resonance emphasize the methods that involve magnetic resonance. This volume seeks to provide a critical evaluation of EPR methods for determining the distances between two unpaired electrons. The editors invited the authors to make this a very practical book, with specific numerical examples of how experimental data is worked up to produce a distance estimate, and realistic assessments of uncertainties and of the range of applicability, along with examples of the power of the technique to answer biological problems. The first chapter is an overview, by two of the editors, of EPR methods to determine distances, with a focus on the range of applicability. The next chapter, also by the Batons, reviews what is known about electron spin relaxation times that are needed in estimating distances between spins or in selecting appropriate temperatures for particular experiments. Albert Beth and Eric Hustedt describe the information about spin-spin interaction that one can obtain by simulating CW EPR line shapes of nitroxyl radicals. The information in fluid solution CW EPR spectra of dual-spin labeled proteins is illustrated by Hassane Mchaourab and Eduardo Perozo.

Distance Measurements In Biological Systems By Epr

Author : Lawrence Berliner
ISBN : 0306465337
Genre : Medical
File Size : 31. 70 MB
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Distance measurements in biological systems by EPR The foundation for understanding function and dynamics of biological systems is knowledge of their structure. Many experimental methodologies are used for determination of structure, each with special utility. Volumes in this series on Biological Magnetic Resonance emphasize the methods that involve magnetic resonance. This volume seeks to provide a critical evaluation of EPR methods for determining the distances between two unpaired electrons. The editors invited the authors to make this a very practical book, with specific numerical examples of how experimental data is worked up to produce a distance estimate, and realistic assessments of uncertainties and of the range of applicability, along with examples of the power of the technique to answer biological problems. The first chapter is an overview, by two of the editors, of EPR methods to determine distances, with a focus on the range of applicability. The next chapter, also by the Batons, reviews what is known about electron spin relaxation times that are needed in estimating distances between spins or in selecting appropriate temperatures for particular experiments. Albert Beth and Eric Hustedt describe the information about spin-spin interaction that one can obtain by simulating CW EPR line shapes of nitroxyl radicals. The information in fluid solution CW EPR spectra of dual-spin labeled proteins is illustrated by Hassane Mchaourab and Eduardo Perozo.

Biomedical Epr Part B Methodology Instrumentation And Dynamics

Author : Sandra S. Eaton
ISBN : 030648532X
Genre : Biochemistry
File Size : 23. 33 MB
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Biomedical EPR – Part A focuses on applications of EPR spectroscopy in the areas of free radicals, metals, medicine, and physiology. The book celebrates the 70th birthday of Prof. James S. Hyde, Medical College of Wisconsin, and his contributions to this field. Chapters are written to provide introductory material for new-comers to the field which lead into up-to-date reviews that provide perspective on the wide range of questions that can be addressed by EPR. Key Features:Free Radicals in Medicine Radicals in vivo and in Model Systems, and their Study by Spin Trapping In vivo EPR, including Oximetry and Imaging Time Domain EPR at Radio Frequencies EPR of Copper Complexes: Motion and Frequency Dependence Time Domain EPR and Electron Spin Echo Envelope Modulation About the Editors: Prof. Sandra S. Eaton is John Evans Professor in the Department of Chemistry and Biochemistry at the University of Denver. Her research interests include distance measurements in proteins, EPR of metal ions in biological systems, electron spin relaxation times, and EPR instrumentation. The Eatons co-organize an annual EPR Symposium in Denver. Prof. Gareth R. Eaton is John Evans Professor in the Department of Chemistry and Biochemistry at the University of Denver. His research interests include EPR instrumentation, distance measurements in proteins, EPR of metal ions in biological systems, and electron spin relaxation times. Dr. Lawrence J. Berliner is currently Professor and Chair of the Department of Chemistry and Biochemistry at the University of Denver after retiring from Ohio State University, where he spent a 32-year career in the area of biological magnetic resonance (EPR and NMR). He is the Series Editor for Biological Magnetic Resonance, which he launched in 1979.

High Field Epr Spectroscopy On Proteins And Their Model Systems

Author : Klaus Möbius
ISBN : 9781847559272
Genre : Science
File Size : 86. 98 MB
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Understanding the major factors determining the specificity of transmembrane transfer processes in proteins is now a hot topic in molecular bio-science. Advanced electron paramagnetic resonance (EPR) at high magnetic fields is a powerful technique for characterizing the transient states of proteins in action. High-Field EPR Spectroscopy on Proteins and their Model Systems: characterization of Transient Paramagnetic States offers a comprehensive overview of experimental techniques in, and paradigmatic examples of, the application of high-field EPR spectroscopy in biology and chemistry. The book’s focus is on the use of the technique in conjunction with site-specific mutation strategies and advanced quantum-chemical computation methods to reveal protein structure and dynamics. This yields new insights into biological processes at the atomic and molecular level. The theoretical and instrumental background of high-field EPR is described and examples of paradigmatic protein systems, such as photosynthetic reaction centres, are discussed in the light of recent investigations. Aspects of structure dynamics-function relations that are revealed by studying site-specific mutants are highlighted, thereby combining high-field EPR with genetic engineering techniques. The information obtained complements that obtained from protein crystallography, solid-state NMR, infrared and optical spectroscopy. The book documents both background knowledge and results of the latest research in the field. Unique features include comparisons of information content of EPR, ENDOR, Triple resonance, ESEEM and PELDOR taken at different microwave frequencies and magnetic fields. Coherent treatment of the subject by the leading Berlin high-field EPR laboratory covers the theoretical background as well as state-of-art research both in terms of instrumentation and application to biological systems. The book provides an outlook to future developments and references for further reading and is essential reading for postdoctoral scientists, professionals, academics and graduate students working in this field.

Electron Paramagnetic Resonance

Author : B. C. Gilbert
ISBN : 9780854043156
Genre : Reference
File Size : 79. 59 MB
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Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.

Biomedical Epr Part A Free Radicals Metals Medicine And Physiology

Author : Sandra S. Eaton
ISBN : 0306485060
Genre : Medical
File Size : 40. 79 MB
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Biomedical EPR – Part A focuses on applications of EPR spectroscopy in the areas of free radicals, metals, medicine, and physiology. The book celebrates the 70th birthday of Prof. James S. Hyde, Medical College of Wisconsin, and his contributions to this field. Chapters are written to provide introductory material for new-comers to the field which lead into up-to-date reviews that provide perspective on the wide range of questions that can be addressed by EPR. Key Features: Free Radicals in Medicine Radicals in vivo and in Model Systems, and their Study by Spin Trapping In vivo EPR, including Oximetry and Imaging Time Domain EPR at Radio Frequencies EPR of Copper Complexes: Motion and Frequency Dependence Time Domain EPR and Electron Spin Echo Envelope Modulation About the Editors: Prof. Sandra S. Eaton is John Evans Professor in the Department of Chemistry and Biochemistry at the University of Denver. Her research interests include distance measurements in proteins, EPR of metal ions in biological systems, electron spin relaxation times, and EPR instrumentation. The Eatons co-organize an annual EPR Symposium in Denver. Prof. Gareth R. Eaton is John Evans Professor in the Department of Chemistry and Biochemistry at the University of Denver. His research interests include EPR instrumentation, distance measurements in proteins, EPR of metal ions in biological systems, and electron spin relaxation times. Dr. Lawrence J. Berliner is currently Professor and Chair of the Department of Chemistry and Biochemistry at the University of Denver after retiring from Ohio State University, where he spent a 32-year career in the area of biological magnetic resonance (EPR and NMR). He is the Series Editor for Biological Magnetic Resonance, which he launched in 1979.

Biological Magnetic Resonance Biomedical Epr Part B Methodology Instrumentation And Dynamics

Author : Sandra S. Eaton
ISBN : STANFORD:36105119836562
Genre : Science
File Size : 82. 27 MB
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Directory Of Graduate Research

Author :
ISBN : UOM:39015053948207
Genre : Chemistry
File Size : 72. 48 MB
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Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Electron Paramagnetic Resonance

Author : M. J. Davies
ISBN : 0854043209
Genre : Reference
File Size : 37. 62 MB
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Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.

Russian Chemical Reviews

Author :
ISBN : UOM:39015072626735
Genre : Chemistry
File Size : 71. 30 MB
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Wiley Encyclopedia Of Chemical Biology

Author : Tadhg P. Begley
ISBN : 0471754773
Genre : Science
File Size : 63. 88 MB
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Biological Magnetic Resonance

Author : Lawrence J. Berliner
ISBN : STANFORD:36105117987078
Genre : Biology
File Size : 68. 73 MB
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Annotation. Describes techniques and applications that have emerged since the previous volume in the series on spin labeling in 1989, and marks a shift in the series to topic-focused volumes. Among the topics are the analysis of spin-label line shapes with novel inhomogeneous broadening from different components widths and applications to spatially disconnected domains in membranes, a comparison of spin-label spectra at X-band and W-band, the site- directed spin labeling of membrane proteins and of interactions between peptides and membranes, spin-labeled nucleic acids, and electron paramagnetic resonance studies of living animals and related model systems. Annotation copyrighted by Book News, Inc., Portland, OR.

Distance Measurements Using Pulsed Epr

Author : Gunnar Widtfeldt Reginsson
ISBN : OCLC:857996516
Genre : Biomolecules
File Size : 20. 69 MB
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The function of biomacromolecules is controlled by their structure and conformational flexibility. Investigating the structure of biologically important macromolecules can, therefore, yield information that could explain their complex biological function. In addition to X ray crystallography and nuclear magnetic resonance (NMR) methods, pulsed electron paramagnetic resonance (EPR) methods, in particular the pulsed electron electron double resonance (PELDOR) technique has, during the last decade, become a valuable tool for structural determination of macromolecules. Long range distance constraints obtained from pulsed EPR measurements, make it possible to carry out structural refinements on structures from NMR and X ray methods. In addition, EPR yields distance distributions that give information about structural flexibility. The use of EPR for structural studies of biomacromolecules requires in most cases site specific incorporation of paramagnetic centres known as spin labelling. To date, spin labelling nucleic acids has required complex spin labelling chemistry. The first application of a site directed and noncovalent spin labelling method for distance measurements on DNA is described. It is demonstrated that noncovalent spin labelling with a rigid spin label can afford detailed information on internal DNA dynamics using PELDOR. Furthermore, it is shown that noncovalent spin labelling can be used to study DNA protein complexes. PELDOR can also yield information about spin label orientation. Therefore, spin labels with limited flexibility can be used to measure the relative orientation of the spin labelled sites. Although information on orientation can be obtained from 9.7 GHz PELDOR measurements in selected applications, measurements at 97 GHz or higher, increases orientation selection. It is shown that PELDOR measurements on semi rigid and rigid nitroxide biradicals using a home built high power 97 GHz EPR spectrometer (Hiper) and model based simulations yield quantitative information on spin label orientations and dynamics. The most widely used spin labels for EPR studies on biomacromolecules are the aminoxyl (nitroxide) radicals. The major drawbacks of nitroxide spin labels include low sensitivity for distance measurements, fast spin spin relaxation in solution and limited stability in reducing environments. Carbon centered triarylmethyl (trityl) radicals have properties that could eliminate some of the limitations of nitroxide spin labels. To evaluate the use of trityl spin labels for nanometer distance measurements, models systems with trityl and nitroxide spin labels were measured using PELDOR and Double Quantum Coherence (DQC). This study shows that trityl spin labels yield reliable information on interlabel distances and dynamics, establishing the trityl radical as a viable spin label for structural studies on biomacromolecules.

Studying Functional Mechanisms Of Membrane Proteins By Epr Distance Measurement And Modeling

Author : Wen-chung Hsiao
ISBN : UCAL:C3446167
Genre :
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Journal

Author : American Chemical Society
ISBN : NYPL:33433068514516
Genre : Chemistry
File Size : 80. 30 MB
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Current Organic Chemistry

Author :
ISBN : UCSD:31822032896409
Genre : Asymmetric synthesis
File Size : 24. 94 MB
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Provides in depth reviews on current progress in the fields of asymmetric synthesis, organometallic chemistry, bioorganic chemistry, heterocyclic chemistry, natural product chemistry, and analytical methods in organic chemistry. Each issue is edited by an appointed Executive Guest Editor.

The Dynamic Molecular Structure Of Membranes And Proteins By Electron Spin Resonance

Author : Yun-Wei Chiang
ISBN : CORNELL:31924105585321
Genre :
File Size : 90. 93 MB
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Recent advances in developing ESR methods to better capture molecular dynamics in membranes and proteins are presented.

Assessing The Functional Structure Of Molecular Transporters By Epr Spectroscopy

Author : Matthias J.N.Junk
ISBN : 9783642251351
Genre : Technology & Engineering
File Size : 21. 72 MB
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In his thesis, Matthias Junk takes an innovative approach to assess the local structure and dynamics of biological and synthetic amphiphilic macromolecules capable of transporting small molecules. Replacing the latter with stable radicals, he uses state-of-the-art electron paramagnetic resonance (EPR) spectroscopy to describe the highly relevant transport function from the viewpoint of the guest molecules. Such, he demonstrates that the functional structure of human serum albumin in solution significantly differs from its crystal structure – a consequence of the protein’s adaptability to host various endogenous compounds and drug molecules. Further, he shows that the thermal collapse of thermoresponsive hydrogels and dendronized polymers leads to static and dynamic heterogeneities on the nanoscale. These heterogeneities bear consequences for the material’s hosting properties and enable unforeseen complex catalytic functionalities.

Ion Channels

Author : Novartis Foundation Symposium
ISBN : UOM:39015052693853
Genre : Science
File Size : 41. 8 MB
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Ion channels provide a unique opportunity to use computational approaches to attempt an understanding of the function of a membrane protein, starting with an atomic resolution structure and progressing through a hierarchy of theoretical descriptions until one can account quantitatively for their physiological function. This book brings together physiologists, structural biologists and theorists who came together to help define the direction of the field in the immediate future. Topics covered include: the x-ray structure of channels and pores computer simulation of channel function detailed data on potassium channels, chloride and calcium channels, and ligand-gated ion channels

Preparation And Properties Of High Valent Mn Carboxylate Clusters

Author : Sumit Bhaduri
ISBN : IND:30000082013578
Genre :
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