Magnetic Resonance Letters最新文献_第6页

Human islet amyloid polypeptide oligomers stabilized and probed by MAS NMR 通过 MAS NMR 稳定和探测人胰岛淀粉样多肽寡聚体

Magnetic Resonance Letters Pub Date : 2024-02-01 DOI: 10.1016/j.mrl.2023.10.001

Ziwei Chang, Zhengfeng Zhang

引用次数: 0

Gradient coil design with enhanced shielding constraint for a cryogen-free superconducting MRI system 为无低温超导磁共振成像系统设计具有增强屏蔽约束的梯度线圈

Magnetic Resonance Letters Pub Date : 2024-02-01 DOI: 10.1016/j.mrl.2023.09.001

Yaohui Wang , Weimin Wang , Hui Liu , Shunzhong Chen , Feng Liu , Qiuliang Wang

引用次数: 0

A study on the temperature sensitivity of NMR porosity in porous media based on the intensity of magnetization 基于磁化强度的多孔介质核磁共振孔隙度温度敏感性研究

Magnetic Resonance Letters Pub Date : 2024-02-01 DOI: 10.1016/j.mrl.2023.06.002

Lu Zhang , Lizhi Xiao , Wensheng Wu , Guangzhi Liao , Yan Zhang , Sihui Luo , Xinglong Lei

引用次数: 0

Probing microstructure of solid-state synthesized LiCoO2 with MAS NMR spectroscopy MAS核磁共振波谱法探测固态合成LiCoO2的微观结构

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.01.001

Suyu Gu, Guozhong Lu, Nianrui Guo, Juncheng Xu, Yu Jiang, Ming Shen, Bingwen Hu

{"title":"Probing microstructure of solid-state synthesized LiCoO2 with MAS NMR spectroscopy","authors":"Suyu Gu, Guozhong Lu, Nianrui Guo, Juncheng Xu, Yu Jiang, Ming Shen, Bingwen Hu","doi":"10.1016/j.mrl.2023.01.001","DOIUrl":"10.1016/j.mrl.2023.01.001","url":null,"abstract":"<div>LiCoO2 is an important category of active cathode materials in lithium-ion batteries due to its high compacted electrode density, good thermal stability, and stable voltage platform. Recent works on LiCoO2 have focused on the realization of higher charging voltages to fully utilize its high theoretical capacity. However, an unambiguous atomic-level local probe is essential for the understanding of structure-function correlation. Here we employ high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy to study the local atomic environments in LiCoO2 synthesized with three common sintering methods. While one-dimensional 7Li NMR shows distinct linewidth and subtle dependence on lithium over-stoichiometry, both 7Li and 59Co relaxation times are highly dependent on the sintering method. We prove that the two-step sintering method favors the elimination of unreacted Co3O4, thereby enabling the best discharge capacity in all-solid-state lithium batteries assembled with LiCoO2/LGPS/LiIn, which is in accordance with its narrowest 7Li linewidth and the longest 7Li/59Co T1.</div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"3 4","pages":"Pages 298-305"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772516223000025/pdfft?md5=949e7c45c86f03421acd2c8146fdb9b9&pid=1-s2.0-S2772516223000025-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45084161","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: 0

Using NMR-detected hydrogen-deuterium exchange to quantify protein stability in cosolutes, under crowded conditions in vitro and in cells 利用核磁共振检测氢-氘交换，定量蛋白质在体外和细胞中溶质和拥挤条件下的稳定性

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.04.003

I-Te Chu , Gary J. Pielak

引用次数: 0

Direct detection redox mechanisms of polyimide electrode by EPR spectroscopy EPR光谱法直接检测聚酰亚胺电极的氧化还原机理

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.06.001

Ji-Hu Su

引用次数: 0

1H and 13C NMR spectral assignments for low-concentration bile acids in biological samples 生物样品中低浓度胆汁酸的1H和13C核磁共振谱分配

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.07.001

Hong Lin , Junbo He , Weinong Zhang , Huiru Tang

{"title":"1H and 13C NMR spectral assignments for low-concentration bile acids in biological samples","authors":"Hong Lin , Junbo He , Weinong Zhang , Huiru Tang","doi":"10.1016/j.mrl.2023.07.001","DOIUrl":"10.1016/j.mrl.2023.07.001","url":null,"abstract":"<div>Bile acids are the main body of enterohepatic circulation in vivo. They have essential functions such as emulsifying fat, bacteriostasis and regulating multiple metabolic pathways as signal molecules. However, the assignments of NMR signals for some low-concentration bile acids are still needed. This study combined 1D nuclear magnetic resonance (NMR) and 2D NMR techniques including 1H–1H correlation spectroscopy (COSY), 1H–1H total correlation spectroscopy (TOCSY), 1H J-resolved spectroscopy (J-Res), 1H–13C heteronuclear single quantum coherence spectroscopy (HSQC), and 1H–13C heteronuclear multiple bond correlation spectroscopy (HMBC) to assign the 1H and 13C signals of six bile acids in aqueous solution at physiological pH (∼7.4) and nine bile acids in methanol. These data are of importance to the NMR-based studies on lipid digestion, absorption, and metabolism.</div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"3 4","pages":"Pages 277-285"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772516223000372/pdfft?md5=b84cbdee805088251dfea825f6c68454&pid=1-s2.0-S2772516223000372-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45373278","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: 0

The parallel-plate resonator: An RF probe for MR and MRI studies over a wide frequency range 平行板谐振器:在宽频率范围内用于磁共振和MRI研究的射频探头

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.01.002

Andrés Ramírez Aguilera , Kevin J. Sanders , Gillian R. Goward , Bruce J. Balcom

引用次数: 1

Non-invasive assessment for intratumoural distribution of interstitial fluid flow 无创评估间质液在肿瘤内的分布

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.03.001

Jun Zhao , Yupeng Cao , Wentao Liu , Dong Han

{"title":"Non-invasive assessment for intratumoural distribution of interstitial fluid flow","authors":"Jun Zhao , Yupeng Cao , Wentao Liu , Dong Han","doi":"10.1016/j.mrl.2023.03.001","DOIUrl":"10.1016/j.mrl.2023.03.001","url":null,"abstract":"<div>Interstitial fluid plays a vital role in drug delivery and tumour treatment. However, few non-invasive measurement methods are available for measuring low-velocity biological fluid flow. Therefore, this study aimed to develop a novel technology called interstitial flow velocity-MRI. The interstitial flow velocity-MRI sequence consists of a dual inversion recovery preparation and an improved stimulated echo sequence (ISTE) combined with phase-contrast MRI. A homemade flow phantom was used to assess the feasibility and sensitivity of interstitial flow velocity-MRI. In addition, xenografts of female BALB/c mouse models of 4T1 breast cancer administered losartan (40 mg/kg) or saline (n = 6) were subjected to imaging on a 7.0 T scanner to assess the in vivo interstitial fluid flow velocity. The results showed a significant correlation (P < 0.001) between the theoretical velocities and velocities measured using the flow phantom. Interstitial flow velocity-MRI could detect a velocity as low as 10.21 ± 2.65 μm/s with a spatial resolution of 0.313 mm. The losartan group had a lower mean interstitial fluid velocity than the control group (85 ± 16 vs 113 ± 24 μm/s). In addition, compared to the saline treatment, losartan treatment reduced the proportion of collagen fibres by 10% and 12% in the Masson and Sirius red staining groups, respectively. Interstitial flow velocity-MRI has the potential to determine interstitial fluid flow velocity non-invasively and exhibits an intuitive velocity map.</div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"3 4","pages":"Pages 286-297"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277251622300013X/pdfft?md5=4623a111d566ffc0ed8619caa776d1ba&pid=1-s2.0-S277251622300013X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49081998","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

Overview and progress of X-nuclei magnetic resonance imaging in biomedical studies x核磁共振成像在生物医学研究中的综述与进展

Magnetic Resonance Letters Pub Date : 2023-11-01 DOI: 10.1016/j.mrl.2023.05.002

Gengxin Wang , Hongyi Yang , Juan Li , Jie Wen , Kai Zhong , Changlin Tian

{"title":"Overview and progress of X-nuclei magnetic resonance imaging in biomedical studies","authors":"Gengxin Wang , Hongyi Yang , Juan Li , Jie Wen , Kai Zhong , Changlin Tian","doi":"10.1016/j.mrl.2023.05.002","DOIUrl":"10.1016/j.mrl.2023.05.002","url":null,"abstract":"<div>Proton nuclear (1H) is the observed nucleus on which most magnetic resonance imaging (MRI) applications depend. Most traditional 1H MRI can provide structural and functional information about organisms, while various non-proton nuclei (X-nuclei) MRI can provide more metabolic information. However, due to the relatively poor signal-to-noise ratio (SNR) of X-nuclei MRI, their applications are quite rare compared to 1H. Benefit from the rapid developments of MRI hardware and software technologies, X-nuclei MRI has recently attracted increasing interests in biomedical research. This review firstly introduces some current methods to improve the SNR of X-nuclei MRI. Secondly, this review describes biomedical applications of X-nuclei MRI, especially focusing on the current use of X-nuclei (13C, 17O, 19F, 23Na and 31P) MRI to study related diseases in different organs, including the brain, liver, kidney, heart and bone. Finally, perspectives studies on X-nuclei imaging and its potential applications are described in biomedical research.</div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"3 4","pages":"Pages 327-343"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772516223000347/pdfft?md5=c189098f51e852f55ae6183d4e19ad08&pid=1-s2.0-S2772516223000347-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46238624","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