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Journal of Magnetic Resonance (1969)最新文献

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Susceptibility, lineshape, and shimming in high-resolution NMR 高分辨率核磁共振的磁化率、线形和振荡
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90258-9
L.F Fuks , F.S.C Huang , C.M Carter , W.A Edelstein , P.B Roemer
{"title":"Susceptibility, lineshape, and shimming in high-resolution NMR","authors":"L.F Fuks ,&nbsp;F.S.C Huang ,&nbsp;C.M Carter ,&nbsp;W.A Edelstein ,&nbsp;P.B Roemer","doi":"10.1016/0022-2364(92)90258-9","DOIUrl":"10.1016/0022-2364(92)90258-9","url":null,"abstract":"<div><p>The field inhomogeneity caused by an object of known susceptibility and shape is calculated. The field perturbation is derived using the method of equivalent magnetic charges. Lineshapes are calculated by summing Lorentzians over the sample volume and are verified experimentally by observing changes caused by introducing material into the vicinity of a previously shimmed NMR sample. Such lineshapes can be used for the determination of susceptibility of materials.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 229-242"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90258-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90405400","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: 37
Optimized acquisition and processing of homonuclear 3D NMR spectra. Applications to transferred-NOE experiments 优化了同核三维核磁共振波谱的采集与处理。转移noe实验的应用
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90272-9
Feng Ni
{"title":"Optimized acquisition and processing of homonuclear 3D NMR spectra. Applications to transferred-NOE experiments","authors":"Feng Ni","doi":"10.1016/0022-2364(92)90272-9","DOIUrl":"10.1016/0022-2364(92)90272-9","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 391-400"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90272-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84136327","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
A 13C- and 15N-edited triple-resonance ROESY experiment 一个13C和15n编辑的三共振ROESY实验
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90265-9
Oliver Zerbe, John H Welsh, John A Robinson, Wolfgang Von Philipsborn
{"title":"A 13C- and 15N-edited triple-resonance ROESY experiment","authors":"Oliver Zerbe,&nbsp;John H Welsh,&nbsp;John A Robinson,&nbsp;Wolfgang Von Philipsborn","doi":"10.1016/0022-2364(92)90265-9","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90265-9","url":null,"abstract":"<div><p>A new triple-resonance pulse sequence that allows <sup>13</sup>C and <sup>15</sup>N editing of ROESY spectra is demonstrated. It incorporates filters that select for heteronuclear multiple-quantum coherence. The phase cycling provides efficient suppression of all peaks except those that originate from ROE magnetization transfer from protons coupled to <sup>13</sup> 3C to protons coupled to <sup>15</sup>N. The loss in signal intensity caused by the filters is discussed. An application of the pulse sequence to a nonapeptide containing two <sup>13</sup>C and two <sup>15</sup>N labels is shown and compared to the conventional ROESY spectrum. The observed ROE indicate a significant population of a turn conformation for the peptide backbone.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 329-335"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90265-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90001159","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
The elimination of magnetic susceptibility distortions in the imaging of liquids in solids: The stray field imaging technique 固体中液体成像磁化率畸变的消除:杂散场成像技术
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90275-C
P Kinchesh , E.W Randall , K Zick
{"title":"The elimination of magnetic susceptibility distortions in the imaging of liquids in solids: The stray field imaging technique","authors":"P Kinchesh ,&nbsp;E.W Randall ,&nbsp;K Zick","doi":"10.1016/0022-2364(92)90275-C","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90275-C","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 411-415"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90275-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91631686","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
Systematic sources of signal irreproducibility and t1 noise in high-field NMR spectrometers 高场核磁共振谱仪中信号不可再现性和t1噪声的系统来源
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90264-8
Gareth A Morris
{"title":"Systematic sources of signal irreproducibility and t1 noise in high-field NMR spectrometers","authors":"Gareth A Morris","doi":"10.1016/0022-2364(92)90264-8","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90264-8","url":null,"abstract":"<div><p>Many of the most powerful modern NMR techniques rely heavily on spectrometer stability and reproducibility. Any deficiencies in these two parameters result in such artifacts as <em>t</em><sub>1</sub> noise in 2D NMR and spurious signals in difference spectra. One of the most important sources of error in NMR signals is the irreproducibility of the effective phases of radio-frequency pulses. In this paper a successful search for systematic sources of such errors in a modern spectrometer is described, and suggestions are given for their treatment. In the spectrometer under study, a threefold improvement in pulse reproducibility was achieved.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 316-328"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90264-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91631683","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: 56
Gradient-enhanced heteronuclear correlation spectroscopy. Theory and experimental aspects 梯度增强异核相关光谱学。理论和实验方面
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90262-6
Jesus Ruiz-Cabello , Geerten W Vuister , Chrit T.W Moonen , Peter van Gelderen , Jack S Cohen , Peter C.M van Zijl
{"title":"Gradient-enhanced heteronuclear correlation spectroscopy. Theory and experimental aspects","authors":"Jesus Ruiz-Cabello ,&nbsp;Geerten W Vuister ,&nbsp;Chrit T.W Moonen ,&nbsp;Peter van Gelderen ,&nbsp;Jack S Cohen ,&nbsp;Peter C.M van Zijl","doi":"10.1016/0022-2364(92)90262-6","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90262-6","url":null,"abstract":"<div><p>A detailed theoretical and experimental treatment is given for gradient-enhanced heteronuclear correlation spectroscopy. Both multiple-quantum and single-quantum sequences are described. In addition to a comparison with conventional experiments using phase cycling, the effects of different gradient combinations are examined with respect to artifacts occurring in the heteronuclear dimension. The influence of gradient performance and diffusion on sensitivity is discussed. Approaches to attain phase-sensitive spectra are also analyzed.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 282-302"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90262-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90001357","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: 137
Background suppression in MAS NMR MAS NMR的背景抑制
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90266-A
Jeffery L White, Larry W Beck, David B Ferguson, James F Haw
{"title":"Background suppression in MAS NMR","authors":"Jeffery L White,&nbsp;Larry W Beck,&nbsp;David B Ferguson,&nbsp;James F Haw","doi":"10.1016/0022-2364(92)90266-A","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90266-A","url":null,"abstract":"<div><p>Pulse sequences for suppressing background signals from spinning modules used in magic-angle spinning NMR are described. These pulse sequences are based on spatially selective composite 90° pulses originally reported by Bax, which provide for no net excitation of spins outside the homogeneous region of the coil. We have achieved essentially complete suppression of background signals originating from our Vespel spinning module (which uses a free-standing coil) in both <sup>1</sup>H and <sup>13</sup>C spectra without notable loss in signal intensity. Successful modification of both Bloch decay and cross-polarization pulse sequences to include spatially selective pulses was essential to acquire background-free spectra for weak samples. Background suppression was also found to be particularly valuable for both <em>T</em><sub>1</sub> and <em>T</em><sub>1<em>ϱ</em></sub>, relaxation measurements.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 336-341"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90266-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91631689","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: 23
A two-dimensional experiment for measurement of couplings between rare spin-12 nuclei with proton sensitivity 用质子灵敏度测量稀有自旋12核之间耦合的二维实验
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90273-A
riks Kupče , Bernd Wrackmeyer, Pierre Granger
{"title":"A two-dimensional experiment for measurement of couplings between rare spin-12 nuclei with proton sensitivity","authors":"riks Kupče ,&nbsp;Bernd Wrackmeyer,&nbsp;Pierre Granger","doi":"10.1016/0022-2364(92)90273-A","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90273-A","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 401-405"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90273-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91631684","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: 4
Optimization of multidimensional NMR using band-selective pulses 利用带选择脉冲优化多维核磁共振
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90276-D
Bernhard Brutscher, Jean-Pierre Simorre, Dominique Marion
{"title":"Optimization of multidimensional NMR using band-selective pulses","authors":"Bernhard Brutscher,&nbsp;Jean-Pierre Simorre,&nbsp;Dominique Marion","doi":"10.1016/0022-2364(92)90276-D","DOIUrl":"10.1016/0022-2364(92)90276-D","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 416-424"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90276-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72934979","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
Anisotropic 23Na spin relaxation in liquid crystals. Determination of all nine spectral densities for a hexagonal lyotropic phase 液晶中的各向异性23Na自旋弛豫。六方溶致相九种光谱密度的测定
Journal of Magnetic Resonance (1969) Pub Date : 1992-11-01 DOI: 10.1016/0022-2364(92)90261-5
Per-Ola Quist, Inge Blom, Bertil Halle
{"title":"Anisotropic 23Na spin relaxation in liquid crystals. Determination of all nine spectral densities for a hexagonal lyotropic phase","authors":"Per-Ola Quist,&nbsp;Inge Blom,&nbsp;Bertil Halle","doi":"10.1016/0022-2364(92)90261-5","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90261-5","url":null,"abstract":"<div><p>The orientation dependence of three independent <sup>23</sup>Na relaxation rates is determined from measurements on the counterions in a magnetically aligned hexagonal lyotropic liquid crystal. The data allow us to determine the nine director-frame spectral densities that comprise the full information content of the spin-relaxation behavior of a quadrupolar nucleus in a uniaxial phase. The model-independent director-frame spectral densities provide important information about the time scale and rotational symmetry of the anisotropic motions in the phase. More detailed information is obtained by invoking a specific dynamic model that separates dynamic and structural factors. The six high-frequency spectral densities are quantitatively accounted for in terms of fast local motions and counterion surface diffusion around the cylindrical surfactant aggregates, while the three zero-frequency spectral densities contain large contributions from diffusion-modulated director fluctuations.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"100 2","pages":"Pages 267-281"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90261-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91631682","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: 7
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