Applied Magnetic Resonance最新文献_第2页

Two Magnon Scattering Contribution to the Ferromagnetic Resonance Linewidth of Pt(Ir)/CoFeTaB/Ir(Pt) Thin Films 双磁振子散射对Pt(Ir)/CoFeTaB/Ir(Pt)薄膜铁磁共振线宽的贡献

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-23 DOI: 10.1007/s00723-023-01601-3

M. Tokaç, S. Kazan, B. Özkal, N. Al-jawfi, B. Rameev, B. Nicholson, A. T. Hindmarch

{"title":"Two Magnon Scattering Contribution to the Ferromagnetic Resonance Linewidth of Pt(Ir)/CoFeTaB/Ir(Pt) Thin Films","authors":"M. Tokaç, S. Kazan, B. Özkal, N. Al-jawfi, B. Rameev, B. Nicholson, A. T. Hindmarch","doi":"10.1007/s00723-023-01601-3","DOIUrl":"10.1007/s00723-023-01601-3","url":null,"abstract":"<div>The magnetic properties of Pt/CoFeTaB/Ir and Ir/CoFeTaB/Pt trilayer thin films have been studied using angular- and temperature-dependent ferromagnetic resonance. This enables quantitative determination of the various contributions to the magnetic behavior, including separating, the effective Gilbert damping, inhomogeneous damping, and two-magnon-scattering contributions to the magnetic dissipation. As-deposited films show behavior consistent with significant incorporation of Ir into CoFeTaB only when the Ir layer is deposited first. Annealing of the structures at (300,^{circ } hbox {C}) causes only minor structural and magnetic modification when Pt is deposited first, and more pronounced changes, attributed to thermally-driven out-diffusion of Ir from CoFeTaB, are found when Ir is deposited first. A holistic consideration of the magnetic resonance behavior can provide detailed information on the atomic-scale structure in magnetic thin-film devices.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 10","pages":"1053 - 1064"},"PeriodicalIF":1.0,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01601-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Possible Applications of Dissolution Dynamic Nuclear Polarization in Conjunction with Zero- to Ultralow-Field Nuclear Magnetic Resonance 结合零场至超低场核磁共振的溶解动态核极化的可能应用

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-22 DOI: 10.1007/s00723-023-01592-1

Danila A. Barskiy, John W. Blanchard, Dmitry Budker, Quentin Stern, James Eills, Stuart J. Elliott, Román Picazo-Frutos, Antoine Garcon, Sami Jannin, Igor V. Koptyug

引用次数: 0

Chain Dynamics in a Polyelectrolyte Solution Under Shear: A Rheological NMR Investigation 剪切条件下聚电解质溶液中的链动力学：流变NMR研究

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-21 DOI: 10.1007/s00723-023-01598-9

Sascha Bartosch, Benjamin Kohn, Ulrich Scheler

引用次数: 0

Solid–Liquid Phase Transitions of Triglycerides in Griebenschmalz, Smalec, and Fedt Studied Using 13C Solid-State NMR with Dynamics-Based Spectral Filtering 用13C固体核磁共振和基于动态的光谱滤波研究了Griebenschmalz, Smalec和Fedt中甘油三酯的固液相变

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-19 DOI: 10.1007/s00723-023-01564-5

Diana Bernin, Emmanouela Leventaki, Daniel Topgaard

{"title":"Solid–Liquid Phase Transitions of Triglycerides in Griebenschmalz, Smalec, and Fedt Studied Using 13C Solid-State NMR with Dynamics-Based Spectral Filtering","authors":"Diana Bernin, Emmanouela Leventaki, Daniel Topgaard","doi":"10.1007/s00723-023-01564-5","DOIUrl":"10.1007/s00723-023-01564-5","url":null,"abstract":"<div>The consumer satisfaction of lard-based bread spreads depends on a delicate balance between a liquid fat phase, allowing the spread to flow, and solid fat crystals, providing the product with substance sometimes further enhanced by crispy pork cracklings. Here we apply 13C solid-state NMR with dynamics-based spectral filtering to characterize and follow the temperature dependence of the co-existing solid and liquid triglyceride phases in commercial German Griebenschmalz and Polish smalec, both containing cracklings, as well as home-made Danish fedt and, as a chemically more pure reference, German Schweineschmalz intended for baking. The NMR method allows detection of carbon atoms representative of saturated, unsaturated, and polyunsaturated acyl chains in both solid and liquid states. The results show that the solid comprises multiple crystal forms with different melting temperatures, while the liquid is at low temperature enriched in triglycerides with shorter acyl chains and higher degree of unsaturation, which become diluted with long-chain saturated triglycerides as the solids are melting. The obtained deeper understanding of the concomitant aspects of the phase transitions may pave the way for future efforts of rational optimization of fat blend composition to extend the temperature range over which the product contains sufficient amounts of both solids and liquids to give texture properties appealing to consumers.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 11-12","pages":"1165 - 1175"},"PeriodicalIF":1.0,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01564-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42832011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oil Mobility in Hazelnut Oil-Based Oleogels Investigated by NMR 核磁共振研究榛子油基油凝胶中油的迁移率

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-18 DOI: 10.1007/s00723-023-01571-6

Lena Trapp, Hilke Schacht, Luisa Eymann, Hermann Nirschl, Gisela Guthausen

引用次数: 0

Bulk NMR Measurements of Spray Dynamics 喷雾动力学的体核磁共振测量

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-18 DOI: 10.1007/s00723-023-01562-7

D. Osmond, W. Selby, L. Romero-Zeron, I. Mastikhin

{"title":"Bulk NMR Measurements of Spray Dynamics","authors":"D. Osmond, W. Selby, L. Romero-Zeron, I. Mastikhin","doi":"10.1007/s00723-023-01562-7","DOIUrl":"10.1007/s00723-023-01562-7","url":null,"abstract":"<div>Spray systems present unique challenges for fluid mechanics research due to their complex dynamics. Non-optical techniques such as synchrotron X-rays and magnetic resonance imaging (MRI) are promising measurement avenues for non-invasive studies of opaque or enclosed sprays. Previous MRI studies of sprays employed sophisticated pulse sequences possible only with an MRI scanner. In this work, we explore the potential of simple bulk NMR techniques, pulsed-field-gradient (PFG), time-of-fight (TOF), and dynamic magnetic resonance scattering to investigate spray dynamics in three distinct regions. A variable recovery delay was employed to filter signal contributions based on velocity. The PFG measurements of mechanical dispersion are the first of their kind to our knowledge, yielding dispersion coefficients in the range of 10–4–10–3 m2/s. Velocity measurements successfully detected velocities surpassing 30 m/s near the nozzle, with the flow slowing down to several m/s downstream. These techniques show potential for investigating spray dynamics and simple gradient requirements making them suitable for portable NMR applications and in situ measurements.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 11-12","pages":"1511 - 1531"},"PeriodicalIF":1.0,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41557734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantifying Liver Fat Using a Low-Field Unilateral MR System 使用低场单侧磁共振系统定量肝脏脂肪

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-17 DOI: 10.1007/s00723-023-01595-y

Cornelius von Morze, Tyler Blazey, Mark S. Conradi

{"title":"Quantifying Liver Fat Using a Low-Field Unilateral MR System","authors":"Cornelius von Morze, Tyler Blazey, Mark S. Conradi","doi":"10.1007/s00723-023-01595-y","DOIUrl":"10.1007/s00723-023-01595-y","url":null,"abstract":"<div>Non-alcoholic fatty liver disease (NAFLD) is a highly prevalent condition with a large impact on public health, but remains largely undetected among individual patients. MRI proton density fraction (MRI-PDFF) is the gold standard method for measuring liver fat content, but might be regarded as “overkill” for this diffuse liver disease process. There is a pressing current medical need for simpler non-invasive approaches to measure and track liver fat content over time, for which emerging unilateral permanent magnet MR technology is uniquely suited. In this study, we evaluate the potential of the barrel magnet system first described by Utsuzawa and Fukushima in 2017 to quantify liver fat content. We tested this novel unilateral MR system in oil–water emulsions and subsequently with ex vivo tissue samples from normal and fatty duck livers. In oil–water emulsions, the system provided good linear agreement between fat signal amplitudes derived from Bayesian analysis of MR signals and known oil content. Clear differences in water and fat signal amplitudes were also observed between normal and fatty liver samples. The ability to discriminate differences in fat content as little as 5% demonstrates clear potential clinical relevance for medical management of NAFLD using a scaled-up system designed for human studies.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 11-12","pages":"1365 - 1376"},"PeriodicalIF":1.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47297061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Homo- and Heteronuclear NMR Methods for Signal Assignments in 1H and 13C Spectra of 1-Aminoacyloxygermatran 1-氨基酰基氧合蛋白1H和13C谱信号赋值的同核和异核NMR方法

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-17 DOI: 10.1007/s00723-023-01593-0

Denis V. Lezov, Tatiana. A. Kochina, Ruslan I. Baichurin, Stanislav I. Selivanov

{"title":"Homo- and Heteronuclear NMR Methods for Signal Assignments in 1H and 13C Spectra of 1-Aminoacyloxygermatran","authors":"Denis V. Lezov, Tatiana. A. Kochina, Ruslan I. Baichurin, Stanislav I. Selivanov","doi":"10.1007/s00723-023-01593-0","DOIUrl":"10.1007/s00723-023-01593-0","url":null,"abstract":"<div>1-Aminoacyloxygermatran containing a hexacoordinated germanium atom and an amino acid substituent in its structure—L-valine—was synthesized and studied by high resolution 1H and 13C NMR spectroscopy for the first time. Complete signal assignment in two different parts of 1H spectra containing 8 and 12 overlapped multiplets from –O-CH2- and –N-CH2- protons was made by using homonuclear J-COSY, COSY and NOESY methods and on base data of heteronuclear HMQC and HMBC experiments. The spatial structure of the studied 1-aminoacyloxygermatran was proved on the basis of data on interproton through-space interactions obtained from the NOESY spectra at different mixing times from 0.3 to 1.2 s. Simultaneously, along with cross peaks from positive NOEs, exchange cross peaks between germinal protons of different -O-CH2- groups were found in the same spectra, thus indicating the existence of a slow (in the NMR time scale) dynamic process in this compound associated with rearrangements within the atranium cycle.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 10","pages":"987 - 998"},"PeriodicalIF":1.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Orientational Selectivity in Pulsed-EPR Does Not Have to be Complicated 脉冲EPR中的定向选择性并不复杂

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-13 DOI: 10.1007/s00723-023-01594-z

Zikri Hasanbasri, Sunil Saxena

{"title":"Orientational Selectivity in Pulsed-EPR Does Not Have to be Complicated","authors":"Zikri Hasanbasri, Sunil Saxena","doi":"10.1007/s00723-023-01594-z","DOIUrl":"10.1007/s00723-023-01594-z","url":null,"abstract":"<div>The development of rigid spin labels and high-frequency spectrometers have improved the capabilities of pulsed-EPR distance measurements in the field of structural biology. Rigid spin labels provide distance constraints that better report on the conformations of the protein or DNA backbone. Additionally, spectrometers at high frequencies improve the sensitivity of pulsed-EPR, even enabling experiments at concentrations close to cellular conditions. Unfortunately, these advents can come with a complication in that the microwave pulse cannot completely sample all orientations of the spins. Consequently, insufficient sampling biases the dipolar frequencies in a manner that depends on the relative orientations of the intramolecularly interacting spins. These relative orientations are generally unknown a priori in a bilabeled biomolecule. This biasing effect, dubbed ‘orientational selectivity,’ is a bottleneck to interpreting distance measurements from the dipolar signal. This review provides an overview of orientational selectivity in the context of distance measurements using Double Electron–Electron Resonance. First, we discuss the genesis of orientational selectivity and briefly overview the literature on spin labels that have manifested orientational selectivity. Second, we outline the various strategies to account for orientational selectivity effects for extracting the distance constraints. Finally, we showcase a new perspective on analyzing orientational selectivity and designing efficient experimental schemes for overcoming orientational selectivity.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 1-3","pages":"61 - 78"},"PeriodicalIF":1.1,"publicationDate":"2023-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44924168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation by ESR Spectroscopy of Biology Active Electron-Rich 1,10-Phenanthrocyanines of d-Elements (Soft Colloidal Glasses) d元素生物活性富电子1,10-菲anthrocyanines的ESR光谱研究(软胶体玻璃)

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-08-12 DOI: 10.1007/s00723-023-01586-z

Viktor N. Demidov, Stanislav M. Sukharzhevsky, Tatiana B. Pakhomova, Alexandra G. Ivanova, Sofia V. Paston, Evgenia V. Bogomolova

{"title":"Investigation by ESR Spectroscopy of Biology Active Electron-Rich 1,10-Phenanthrocyanines of d-Elements (Soft Colloidal Glasses)","authors":"Viktor N. Demidov, Stanislav M. Sukharzhevsky, Tatiana B. Pakhomova, Alexandra G. Ivanova, Sofia V. Paston, Evgenia V. Bogomolova","doi":"10.1007/s00723-023-01586-z","DOIUrl":"10.1007/s00723-023-01586-z","url":null,"abstract":"<div>The 1,10-phenanthrocyanines of d-elements were investigated by ESR spectroscopy both in the solid (glassy) state and in solutions. These are coordination compounds of a new structural class of apocyanines: chromophore binuclear cation complexes [M2+Ln(µ-PC)]2Xm (M2+ = Zn2+, Cd2+, Co2+, Pd2+and Pt2+; L = 1,10-phenanthroline, 2,9-Me2-1,10-phenanthroline, pyridine; X = AcO−, Cl−) with electron-rich bridged 1,10-phenanthrocyanine ligands µ-PC. They are presented as soft colloidal glasses capable of acting as inhibitors of tumor cell proliferation, fungicides and DNA complexones. The study of them by ESR spectroscopy showed that one of the possible mechanisms for the formation of spin centers is thermally directed singlet–triplet S0 → Tlow.-transitions.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 10","pages":"1015 - 1051"},"PeriodicalIF":1.0,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01586-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0