Journal of Magnetic Resonance, Series B最新文献_第2页

Journal of Magnetic Resonance, Series B Pub Date : 1996-12-01 DOI: 10.1006/jmrb.1996.0190

引用次数: 0

A Three-Dimensional NMR Imaging Scheme Utilizing Doubly Resonant Gradient Coils 利用双共振梯度线圈的三维核磁共振成像方案

Journal of Magnetic Resonance, Series B Pub Date : 1996-12-01 DOI: 10.1006/jmrb.1996.0179

S.L. Codd , M.J.D. Mallett , M.R. Halse , J.H. Strange , W. Vennart , T.Van Doorn

引用次数: 12

Magnetically Oriented Phospholipid Bilayered Micelles for Structural Studies of Polypeptides. Does the Ideal Bicelle Exist? 用于多肽结构研究的磁性磷脂双层胶束。理想的单倍体存在吗?

Journal of Magnetic Resonance, Series B Pub Date : 1996-12-01 DOI: 10.1006/jmrb.1996.0187

Regitze R. Vold , R.Scott Prosser

引用次数: 206

Application of a Three-Dimensional Maximum-Entropy Method to Processing Sections of Three-Dimensional NMR Spectra 三维最大熵方法在三维核磁共振波谱剖面处理中的应用

Journal of Magnetic Resonance, Series B Pub Date : 1996-12-01 DOI: 10.1006/jmrb.1996.0183

Guang Zhu

引用次数: 4

NMR Pulse Schemes for the Sequential Assignment of Arginine Side-Chain HϵProtons 精氨酸侧链顺序配位的核磁共振脉冲方案HϵProtons

Journal of Magnetic Resonance, Series B Pub Date : 1996-12-01 DOI: 10.1006/jmrb.1996.0188

N.Sambasiva Rao , Pascale Legault , D.R. Muhandiram , Jack Greenblatt , John L. Battiste , James R. Williamson , Lewis E. Kay

引用次数: 18

Resolution and Sensitivity Gain in HCCH–TOCSY Experiments by Homonuclear CβDecoupling 同核c - β解耦在HCCH-TOCSY实验中的分辨率和灵敏度增益

Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0175

Hiroshi Matsuo , Ēriks Kupce , Gerhard Wagner

引用次数: 15

Spatially Localized, One- and Two-Dimensional NMR Spectroscopy andin VivoApplication to Human Muscle 空间定位，一维和二维核磁共振波谱及其在人体肌肉中的应用

Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0163

Roland Kreis , Chris Boesch

{"title":"Spatially Localized, One- and Two-Dimensional NMR Spectroscopy andin VivoApplication to Human Muscle","authors":"Roland Kreis , Chris Boesch","doi":"10.1006/jmrb.1996.0163","DOIUrl":"10.1006/jmrb.1996.0163","url":null,"abstract":"<div>The localized1H MR spectrum of human muscle has recently been reported to feature unassigned, orientation-dependent resonance lines. For their characterizationin vivo,various NMR techniques were combined with 3D spatial localization: 2D-J spectroscopy, zero-quantum- and Zeeman-order-filtering, double-quantum-filtering, 2D-constant-time COSY, dipolar-order filtering, and 2D-longitudinal-order separated spectroscopy. The successful implementation of these methods on a whole-body MR system and their application to study human subjects is described.1H MR spectra of human muscle were found to feature residual dipolar couplings and anisotropic susceptibilities which render resonance frequencies, phases, and—with some sequences—signal intensities orientation dependent. Two of the unidentified resonances unequivocally form a dipolar doublet of two equivalent protons, centered at 3.93 ppm. All unknown as well as previously assigned peaks in the range between 2.7 and 3.6 ppm are either subject to dipolar coupling themselves or overlap with spectral contributions of metabolites involved in dipolar coupling. The methyl protons of creatine are likely to be subject to residual dipolar coupling and do therefore form a dipolar triplet and not a singlet as previously assumed. Finally, X3, a further unidentified peak at 3.5 ppm, appears to be part of a multiplet with its center at 3.3 ppm and overlapping the trimethylammonium resonance.</div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 103-118"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 82

Spin–Lattice Relaxation of Denatured Nitrosyl Hemoproteins 变性亚硝基血红蛋白的自旋晶格弛豫

Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0164

Eliane Wajnberg , Odivaldo Cambraia Alves

引用次数: 1

Dependence of Saturation-Transfer EPR Intensities on Spin–Lattice Relaxation 饱和转移EPR强度与自旋晶格弛豫的关系

Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0168

T. Páli , V.A. Livshits , D. Marsh

{"title":"Dependence of Saturation-Transfer EPR Intensities on Spin–Lattice Relaxation","authors":"T. Páli , V.A. Livshits , D. Marsh","doi":"10.1006/jmrb.1996.0168","DOIUrl":"10.1006/jmrb.1996.0168","url":null,"abstract":"<div>The intensities of saturation-transfer EPR (ST-EPR) spectra from nitroxyl spin labels have proved a sensitive means for studying slow exchange processes (both Heisenberg spin exchange and physical/chemical exchange) and weak interactions with paramagnetic ions, via the dependence on the effective spin–lattice relaxation rate (D. Marsh,Appl. Magn. Reson.3, 53, 1992). The dependences of the second-harmonic EPR absorption intensities detected in phase quadrature with the field modulation (V′2) on the microwaveH1field, and on the effective relaxation times, were studied both theoretically and experimentally. Power-saturation curves and normalized integrated intensities (IST) of theV′2spectra were determined as a function of the concentration of a spin-labeled phospholipid in lipid membranes and of the concentration of paramagnetic Ni2+ions in the aqueous phase as a means of varying the effective relaxation times. The results were correlated with progressive-saturation measurements of the double-integrated intensities of the conventional EPR spectra. Intensities of theV′2spectra were calculated from the Bloch equations incorporating the modulation and microwave fields (K. Halbach,Helv. Phys. Acta27, 259, 1954), and the results were fitted to the experimental data. The ST-EPR intensities depend approximately linearly on the effectiveT1, but with a nonzero intercept. On the basis of the theoretical calculations and experimental correlations, relations betweenISTandT1are suggested that may improve precision in the application of this alternative form of ST-EPR spectroscopy to biological systems.</div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 151-159"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19916791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Simultaneous Suppression of the H2O Double-Quantum Signal and of the Radiation-Damping Effect in Double-Quantum Experiments 双量子实验中水双量子信号的同步抑制及辐射阻尼效应

Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0176

Claudio Dalvit , Jean Marc Böhlen

引用次数: 13