Geoffrey P. Kelly, Frederick W. Muskett, David Whitford
{"title":"3DJ-Resolved HSQC, a Novel Approach to Measuring3JHNα. Application to Paramagnetic Proteins","authors":"Geoffrey P. Kelly, Frederick W. Muskett, David Whitford","doi":"10.1006/jmrb.1996.0160","DOIUrl":"10.1006/jmrb.1996.0160","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 1","pages":"Pages 88-90"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19853145","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}
D.A. Oleskevich, N. Ghahramany , W.P. Weglarz, H. Peemoeller
Magnetization exchange between the solid-wood component and water was studied in hydrated aspen wood by 2D NMR time-domain spectroscopy. Analysis of the relaxation results for exchange shows that a three-site system (water and two wood components) is involved and that the water protons are strongly coupled (a wood-to-water exchange rate of 640 s−1) to the water-accessible wood protons, which in turn are less strongly coupled (a wood-to-wood exchange rate of 64 s−1) to the water-inaccessible wood protons.
{"title":"Interfacial Spin–Spin Coupling in Wood by 2D Time-Domain NMR","authors":"D.A. Oleskevich, N. Ghahramany , W.P. Weglarz, H. Peemoeller","doi":"10.1006/jmrb.1996.0148","DOIUrl":"10.1006/jmrb.1996.0148","url":null,"abstract":"<div><p>Magnetization exchange between the solid-wood component and water was studied in hydrated aspen wood by 2D NMR time-domain spectroscopy. Analysis of the relaxation results for exchange shows that a three-site system (water and two wood components) is involved and that the water protons are strongly coupled (a wood-to-water exchange rate of 640 s<sup>−1</sup>) to the water-accessible wood protons, which in turn are less strongly coupled (a wood-to-wood exchange rate of 64 s<sup>−1</sup>) to the water-inaccessible wood protons.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 1","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73792725","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}
J.A. Jones , P. Hodgkinson , A.L. Barker , P.J. Hore
It is shown how Cramér–Rao theory may be used to determine the optimal sampling pattern for measuring the NMR spin–spin relaxation time,T2. The results may also be applied to the measurement of any other exponential decay, including some pulse sequences for measuring the spin–lattice relaxation time,T1. The optimal sampling pattern involves placing 22% of the sample points at zero time and the remaining 78% at 1.28T2, or, more practically and almost as accurately, one point at zero and four at 1.30T2. These sampling patterns are very different from those commonly used. The Cramér–Rao results are compared with experimental measurements and computer simulations. Some limitations of the method are described, and its extension to the simultaneous measurement of a range ofT2values is addressed.
{"title":"Optimal Sampling Strategies for the Measurement of Spin–Spin Relaxation Times","authors":"J.A. Jones , P. Hodgkinson , A.L. Barker , P.J. Hore","doi":"10.1006/jmrb.1996.0151","DOIUrl":"10.1006/jmrb.1996.0151","url":null,"abstract":"<div><p>It is shown how Cramér–Rao theory may be used to determine the optimal sampling pattern for measuring the NMR spin–spin relaxation time,<em>T</em><sub>2</sub>. The results may also be applied to the measurement of any other exponential decay, including some pulse sequences for measuring the spin–lattice relaxation time,<em>T</em><sub>1</sub>. The optimal sampling pattern involves placing 22% of the sample points at zero time and the remaining 78% at 1.28<em>T</em><sub>2</sub>, or, more practically and almost as accurately, one point at zero and four at 1.30<em>T</em><sub>2</sub>. These sampling patterns are very different from those commonly used. The Cramér–Rao results are compared with experimental measurements and computer simulations. Some limitations of the method are described, and its extension to the simultaneous measurement of a range of<em>T</em><sub>2</sub>values is addressed.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 1","pages":"Pages 25-34"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77368075","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}
{"title":"A Combined PEDRI and CW-EPR Instrument for Detecting Free Radicalsin Vivo","authors":"S.J. Mccallum, I. Nicholson, D.J. Lurie","doi":"10.1006/jmrb.1996.0156","DOIUrl":"10.1006/jmrb.1996.0156","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 1","pages":"Pages 65-69"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0156","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81755520","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}
{"title":"Distinguishing Inter- and Intrastrand NOEs Involving Exchangeable Protons in RNA Duplexes","authors":"C. Sich, J. Flemming, R. Ramachandran, L.R. Brown","doi":"10.1006/jmrb.1996.0142","DOIUrl":"10.1006/jmrb.1996.0142","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 3","pages":"Pages 275-281"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0142","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19887340","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}
{"title":"Novel Pulse Sequences for the Resonance Assignment of Aromatic Side Chains in13C-Labeled Proteins","authors":"Frank Löhr, Heinz Rüterjans","doi":"10.1006/jmrb.1996.0140","DOIUrl":"10.1006/jmrb.1996.0140","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 3","pages":"Pages 259-268"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0140","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781600","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}
Very precise measurements of1JNHcouplings have been made for approximately 40% of the amide sites in cyanometmyoglobin using two different experimental approaches. The first approach is a previously described frequency-based method in which the couplings are observed as splittings in the frequency-domain spectrum. The second is a new approach, along the lines of quantitativeJ-correlation spectroscopy, in which the coupling is encoded in the resonance intensity. Measurements obtained from the two experimental techniques are in agreement to a high degree of precision (s.d. of 0.17 Hz) and residual deviations appear to be largely random. The new method offers substantial time savings when resonances are widely dispersed in the frequency domain and may offer improved precision in these instances.
{"title":"A QuantitativeJ-Correlation Experiment for the Accurate Measurement of One-Bond Amide15N–1H Couplings in Proteins","authors":"J.R. Tolman, J.H. Prestegard","doi":"10.1006/jmrb.1996.0138","DOIUrl":"10.1006/jmrb.1996.0138","url":null,"abstract":"<div><p>Very precise measurements of<sup>1</sup><em>J</em><sub>NH</sub>couplings have been made for approximately 40% of the amide sites in cyanometmyoglobin using two different experimental approaches. The first approach is a previously described frequency-based method in which the couplings are observed as splittings in the frequency-domain spectrum. The second is a new approach, along the lines of quantitative<em>J</em>-correlation spectroscopy, in which the coupling is encoded in the resonance intensity. Measurements obtained from the two experimental techniques are in agreement to a high degree of precision (s.d. of 0.17 Hz) and residual deviations appear to be largely random. The new method offers substantial time savings when resonances are widely dispersed in the frequency domain and may offer improved precision in these instances.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 3","pages":"Pages 245-252"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0138","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19887338","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}
{"title":"Homonuclear 1D and 2D NMR Experiments for the Observation of Solvent–Solute Interactions","authors":"Claudio Dalvit","doi":"10.1006/jmrb.1996.0143","DOIUrl":"10.1006/jmrb.1996.0143","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 3","pages":"Pages 282-288"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781602","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}
{"title":"Navigated Single-Voxel Short-Echo-Time Proton Spectroscopy of Moving Objects","authors":"J.Michael Tyszka, Jeffrey M. Silverman","doi":"10.1006/jmrb.1996.0146","DOIUrl":"10.1006/jmrb.1996.0146","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 3","pages":"Pages 302-306"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781605","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}
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