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Journal of Magnetic Resonance, Series A最新文献

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Recovery of Heteronuclear Coherence-Transfer Efficiency Losses Due to1H–1HJCoupling in Proton to Phosphorus RINEPT 异核相干性的恢复——质子与磷的耦合导致的转移效率损失
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0244
Afsaneh Mohebbi, Oded Gonen
{"title":"Recovery of Heteronuclear Coherence-Transfer Efficiency Losses Due to1H–1HJCoupling in Proton to Phosphorus RINEPT","authors":"Afsaneh Mohebbi, Oded Gonen","doi":"10.1006/jmra.1996.0244","DOIUrl":"10.1006/jmra.1996.0244","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 237-241"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0244","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72611197","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: 9
Coil Design for Large-Volume High-B1Homogeneity for Solid-State NMR Applications 用于固体核磁共振应用的大体积高b1均匀性线圈设计
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0229
A.F. Privalov , S.V. Dvinskikh , H.-M. Vieth
{"title":"Coil Design for Large-Volume High-B1Homogeneity for Solid-State NMR Applications","authors":"A.F. Privalov ,&nbsp;S.V. Dvinskikh ,&nbsp;H.-M. Vieth","doi":"10.1006/jmra.1996.0229","DOIUrl":"10.1006/jmra.1996.0229","url":null,"abstract":"<div><p>The design of a solenoidal NMR coil with high-<em>B</em><sub>1</sub>homogeneity for high-frequency solid-state NMR is described. The coil is made of thin ribbon of continuously variable width. The width is varied to minimize inhomogeneity in the axial direction. The field distribution throughout the entire volume of the sample was taken into account. The gap between turns is constant and kept small to minimize field inhomogeneity in the radial direction. For large samples in particular, coils of this design tested at 300 MHz show significantly better homogeneity than helical coils with constant pitch or coils with variable pitch but fixed ribbon width.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 157-160"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80470751","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: 24
“Double-WURST” Decoupling for15N- and13C-Double-Labeled Proteins in a High Magnetic Field 高磁场下15n -和13c -双标记蛋白的“Double-WURST”解耦
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0233
Shanmin Zhang, Jian Wu , David G. Gorenstein
{"title":"“Double-WURST” Decoupling for15N- and13C-Double-Labeled Proteins in a High Magnetic Field","authors":"Shanmin Zhang,&nbsp;Jian Wu ,&nbsp;David G. Gorenstein","doi":"10.1006/jmra.1996.0233","DOIUrl":"10.1006/jmra.1996.0233","url":null,"abstract":"<div><p>A “Double-WURST” decoupling sequence is constructed for simultaneously decoupling the<sup>13</sup>CO and<sup>13</sup>C<sub>α</sub>regions in<sup>15</sup>N/<sup>13</sup>C-double-labeled proteins. It uses frequency-shifted WURST decoupling combined with standard WURST decoupling. The power can be reduced by two-thirds compared to conventional WURST decoupling, which decouples the entire<sup>13</sup>C region including the unneeded region between<sup>13</sup>CO and<sup>13</sup>C<sub>α</sub>. Well-decoupled spectra are acquired using the Double-WURST decoupling sequence with a test<sup>15</sup>N/<sup>13</sup>C-double-labeled peptide sample and 8 and 19.6 kDa<sup>15</sup>N/<sup>13</sup>C-double-labeled proteins. It has also been shown that adiabatic decoupling, WURST, for example, has already reached its highest decoupling index<em>n</em>(=2) defined in a relation of decouple range Δ<em>f</em>versus RF pulse strength<em>f</em><sub>1rms</sub>, i.e., Δ<em>f</em>= λ(<em>f</em><sub>1rms</sub>)<sup><em>n</em></sup>, where λ is a constant. For<em>n</em>greater than 2, the energy conservation law would be violated, and therefore is not possible.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 181-187"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0233","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79177010","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: 5
13C MAS NMR Spectra ofcis,cis-Mucononitrile in Liquid-Crystalline Media and in the Solid State. Orientation of the Carbon Chemical-Shift Tensors 顺式、顺式腈在液晶介质和固态中的13C - MAS NMR谱。碳化学位移张量的取向
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0235
K.V. Ramanathan , N. Suryaprakash , C.L. Khetrapal , Edwin D. Becker , Klaus Eichele , Roderick E. Wasylishen
{"title":"13C MAS NMR Spectra ofcis,cis-Mucononitrile in Liquid-Crystalline Media and in the Solid State. Orientation of the Carbon Chemical-Shift Tensors","authors":"K.V. Ramanathan ,&nbsp;N. Suryaprakash ,&nbsp;C.L. Khetrapal ,&nbsp;Edwin D. Becker ,&nbsp;Klaus Eichele ,&nbsp;Roderick E. Wasylishen","doi":"10.1006/jmra.1996.0235","DOIUrl":"10.1006/jmra.1996.0235","url":null,"abstract":"<div><p>The spinning sidebands observed in the<sup>13</sup>C MAS NMR spectra of<em>cis,cis</em>-mucononitrile oriented in liquid-crystalline media and of the neat sample in the solid state are studied. There are differences in the sideband intensity patterns in the two cases. These differences arise because the order parameters which characterize the orientation of the solute in the liquid-crystalline media differ for different axes. It is shown that, in general, the relative intensities of the sidebands contain information on the sign and magnitude of an effective chemical-shift parameter which is a function of the sum of the products of the principal components of the chemical-shift tensor and the corresponding order parameters with respect to the director. A method for obtaining the orientation of the carbon chemical-shift tensor is proposed. The carbon chemical-shift tensors obtained from gauge-including atomic orbital calculations are also presented for comparison.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 196-200"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88411373","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: 2
Combined Use of Gradient-Enhanced Techniques and Reference Deconvolution for Ultralowt1Noise in 2D NMR Spectroscopy 二维核磁共振波谱超低噪声的梯度增强技术和参考反褶积联合应用
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0246
Timothy J. Horne, Gareth A. Morris
{"title":"Combined Use of Gradient-Enhanced Techniques and Reference Deconvolution for Ultralowt1Noise in 2D NMR Spectroscopy","authors":"Timothy J. Horne,&nbsp;Gareth A. Morris","doi":"10.1006/jmra.1996.0246","DOIUrl":"10.1006/jmra.1996.0246","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 246-252"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0246","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83860608","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: 15
Solvent Suppression Using Selective Echo Dephasing 选择性回波消相的溶剂抑制
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0242
M. Mescher , A. Tannus , M.O'neil Johnson , M. Garwood
{"title":"Solvent Suppression Using Selective Echo Dephasing","authors":"M. Mescher ,&nbsp;A. Tannus ,&nbsp;M.O'neil Johnson ,&nbsp;M. Garwood","doi":"10.1006/jmra.1996.0242","DOIUrl":"10.1006/jmra.1996.0242","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 226-229"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82694952","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: 196
Determination ofJCCCoupling Constants Using Parahydrogen-Induced Polarization 用对氢诱导极化法测定jcc偶联常数
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0247
Johannes Natterer, Jens Barkemeyer, Joachim Bargon
{"title":"Determination ofJCCCoupling Constants Using Parahydrogen-Induced Polarization","authors":"Johannes Natterer,&nbsp;Jens Barkemeyer,&nbsp;Joachim Bargon","doi":"10.1006/jmra.1996.0247","DOIUrl":"10.1006/jmra.1996.0247","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 253-256"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0247","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79287106","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: 8
B1-Selective Pulses B1-Selective脉冲
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0243
Richard Kemp-Harper , Peter Styles , Stephen Wimperis
{"title":"B1-Selective Pulses","authors":"Richard Kemp-Harper ,&nbsp;Peter Styles ,&nbsp;Stephen Wimperis","doi":"10.1006/jmra.1996.0243","DOIUrl":"10.1006/jmra.1996.0243","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 230-236"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0243","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72869910","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: 6
3D Diffusion-Ordered TOCSY for Slowly Diffusing Molecules 慢扩散分子的三维扩散有序TOCSY
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0241
Alexej Jerschow , Norbert Müller
{"title":"3D Diffusion-Ordered TOCSY for Slowly Diffusing Molecules","authors":"Alexej Jerschow ,&nbsp;Norbert Müller","doi":"10.1006/jmra.1996.0241","DOIUrl":"10.1006/jmra.1996.0241","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 222-225"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78806613","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: 111
Methods for Heteronuclear Thin-Film NMR 异核薄膜核磁共振方法
Journal of Magnetic Resonance, Series A Pub Date : 1996-12-01 DOI: 10.1006/jmra.1996.0231
R.W. Singerman , R.C. Richardson
{"title":"Methods for Heteronuclear Thin-Film NMR","authors":"R.W. Singerman ,&nbsp;R.C. Richardson","doi":"10.1006/jmra.1996.0231","DOIUrl":"10.1006/jmra.1996.0231","url":null,"abstract":"<div><p>The fabrication and analysis of<sup>19</sup>F-based and<sup>1</sup>H-based thin films and the NMR techniques employed for studying them are discussed. The heteronuclear magnetization transfer results in disordered media that motivated the development of the ordered thin-film techniques are summarized. The experimental setup and sample geometry for the thin-film experiments are described, and the techniques for thin-film preparation and thickness measurement are discussed. For the NMR spectrometer, coil tuning via changing the applied magnetic field and the techniques employed for lowering the dead time are described. No signal averaging was required to obtain spin echoes from a sample composed of 0.5 μm thin films.<em>T</em><sub>1</sub>values on the order of one minute were measured in the thin films at a temperature of 0.5 K. These techniques should be of particular use in studying cross relaxation at surfaces and NMR of membrane proteins.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 168-173"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0231","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78915208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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