Magnetic Resonance Letters最新文献_第6页

Measurement of protein non-covalent interactions in buffer and cells 缓冲液和细胞中蛋白质非共价相互作用的测定

Magnetic Resonance Letters Pub Date : 2025-05-01 Epub Date: 2024-12-06 DOI: 10.1016/j.mrl.2024.200173

Jingwen Li , Xiangfei Song , Lishan Yao

引用次数: 0

A hybrid denoising method for low-field nuclear magnetic resonance data 低场核磁共振数据的混合去噪方法

Magnetic Resonance Letters Pub Date : 2025-05-01 Epub Date: 2024-10-30 DOI: 10.1016/j.mrl.2024.200167

Yongjie Zhao , Ranhong Xie , Ke Huang , Huan Su , Jiangfeng Guo

{"title":"A hybrid denoising method for low-field nuclear magnetic resonance data","authors":"Yongjie Zhao , Ranhong Xie , Ke Huang , Huan Su , Jiangfeng Guo","doi":"10.1016/j.mrl.2024.200167","DOIUrl":"10.1016/j.mrl.2024.200167","url":null,"abstract":"<div><div>Low-field nuclear magnetic resonance (NMR) has broad application prospects in the exploration and development of unconventional oil and gas reservoirs. However, NMR instruments tend to acquire echo signals with relatively low signal-to-noise ratio (SNR), resulting in poor accuracy of <em>T</em><sub>2</sub> spectrum inversion. It is crucial to preprocess the low SNR data with denoising methods before inversion. In this paper, a hybrid NMR data denoising method combining empirical mode decomposition-singular value decomposition (EMD-SVD) was proposed. Firstly, the echo data were decomposed with the EMD method to low- and high-frequency intrinsic mode function (IMF) components as well as a residual. Next, the SVD method was employed for the high-frequency IMF components denoising. Finally, the low-frequency IMF components, the denoised high-frequency IMF components, and the residual are summed to form the denoised signal. To validate the effectiveness and feasibility of the EMD-SVD method, numerical simulations, experimental data, and NMR log data processing were conducted. The results indicate that the inverted NMR spectra with the EMD-SVD denoising method exhibit higher quality compared to the EMD method and the SVD method.</div></div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"5 2","pages":"Article 200167"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213453","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: 0

Artificial intelligence goes from predicting structure to predicting stability 人工智能从预测结构到预测稳定性

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2025-01-21 DOI: 10.1016/j.mrl.2025.200176

Gary J. Pielak , Conggang Li , Maili Liu

引用次数: 0

Biophysical and NMR analysis reveals binding affinity between HAX1 and CLPB proteins 生物物理和核磁共振分析显示HAX1和CLPB蛋白之间的结合亲和力

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-06-27 DOI: 10.1016/j.mrl.2024.200141

Huiqin Zhang , Yong Liu , Yunyan Li , Maosen Ruan , Shu Zhou , Junfeng Wang , Jing Yang

{"title":"Biophysical and NMR analysis reveals binding affinity between HAX1 and CLPB proteins","authors":"Huiqin Zhang , Yong Liu , Yunyan Li , Maosen Ruan , Shu Zhou , Junfeng Wang , Jing Yang","doi":"10.1016/j.mrl.2024.200141","DOIUrl":"10.1016/j.mrl.2024.200141","url":null,"abstract":"<div><div>HCLS1-associated protein X-1 (HAX1) is a multifunctional mitochondrial protein involved in the regulation of apoptosis, a crucial process of programmed cell death, and mRNA processing. Despite its significance, limited structural data is available for HAX1, hindering a comprehensive understanding of its biological function. Notably, the caseinolytic mitochondrial matrix peptidase chaperone subunit B (CLPB) has been identified as an interacting partner of HAX1, yet the biophysical properties and binding affinity governing their interaction remain poorly defined. In this study, we present a thorough biophysical characterization of full-length human HAX1 and CLPB, accomplished through recombinant expression and purification. By employing size exclusion chromatography, dynamic light scattering, and circular dichroism spectroscopy, we successfully established their biophysical properties, revealing contrasting structural features, with CLPB displaying α-helical content and HAX1 exhibiting a disordered nature. Moreover, we employed solution-state nuclear magnetic resonance (NMR) spectroscopy to probe their binding affinity. Our findings demonstrate the formation of stable multimeric complexes between HAX1 and CLPB, and we quantified a dissociation constant in the low range of micro-molar for their high affinity interaction. These results lay the foundation for further in-depth investigations into the dynamics and energetics governing the HAX1-CLPB interaction, ultimately contributing to a comprehensive understanding of their functional mechanisms.</div></div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"5 1","pages":"Article 200141"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609281","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

Rapid imaging of pulmonary ventilation function evaluation with 129Xe MRI 129Xe MRI快速成像评价肺通气功能

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-11-12 DOI: 10.1016/j.mrl.2024.200169

Li Fan, Shiyuan Liu

引用次数: 0

Cloud-magnetic resonance imaging system: In the era of 6G and artificial intelligence 云磁共振成像系统：在6G和人工智能时代

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-05-30 DOI: 10.1016/j.mrl.2024.200138

Yirong Zhou , Yanhuang Wu , Yuhan Su , Jing Li , Jianyu Cai , Yongfu You , Jianjun Zhou , Di Guo , Xiaobo Qu

{"title":"Cloud-magnetic resonance imaging system: In the era of 6G and artificial intelligence","authors":"Yirong Zhou , Yanhuang Wu , Yuhan Su , Jing Li , Jianyu Cai , Yongfu You , Jianjun Zhou , Di Guo , Xiaobo Qu","doi":"10.1016/j.mrl.2024.200138","DOIUrl":"10.1016/j.mrl.2024.200138","url":null,"abstract":"<div><div>Magnetic resonance imaging (MRI) plays an important role in medical diagnosis, generating petabytes of image data annually in large hospitals. This voluminous data stream requires a significant amount of network bandwidth and extensive storage infrastructure. Additionally, local data processing demands substantial manpower and hardware investments. Data isolation across different healthcare institutions hinders cross-institutional collaboration in clinics and research. In this work, we anticipate an innovative MRI system and its four generations that integrate emerging distributed cloud computing, 6G bandwidth, edge computing, federated learning, and blockchain technology. This system is called Cloud-MRI, aiming at solving the problems of MRI data storage security, transmission speed, artificial intelligence (AI) algorithm maintenance, hardware upgrading, and collaborative work. The workflow commences with the transformation of <em>k</em>-space raw data into the standardized Imaging Society for Magnetic Resonance in Medicine Raw Data (ISMRMRD) format. Then, the data are uploaded to the cloud or edge nodes for fast image reconstruction, neural network training, and automatic analysis. Then, the outcomes are seamlessly transmitted to clinics or research institutes for diagnosis and other services. The Cloud-MRI system will save the raw imaging data, reduce the risk of data loss, facilitate inter-institutional medical collaboration, and finally improve diagnostic accuracy and work efficiency.</div></div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"5 1","pages":"Article 200138"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609284","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

Numerical design of transverse gradient coil with transformed magnetic gradient field over an effective imaging area 有效成像区域上梯度磁场变换的横向梯度线圈的数值设计

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-06-20 DOI: 10.1016/j.mrl.2024.200139

Chaoqun Niu , Hongyi Qu

{"title":"Numerical design of transverse gradient coil with transformed magnetic gradient field over an effective imaging area","authors":"Chaoqun Niu , Hongyi Qu","doi":"10.1016/j.mrl.2024.200139","DOIUrl":"10.1016/j.mrl.2024.200139","url":null,"abstract":"<div><div>Gradient coil is an essential component of a magnetic resonance imaging (MRI) scanner. To achieve high spatial resolution and imaging speed, a high-efficiency gradient coil with high slew rate is required. In consideration of the safety and comfort of the patient, the mechanical stability, acoustic noise and peripheral nerve stimulation (PNS) are also need to be concerned for practical use. In our previous work, a high-efficiency whole-body gradient coil set with a hybrid cylindrical-planar structure has been presented, which offers significantly improved coil performances. In this work, we propose to design this transverse gradient coil system with transformed magnetic gradient fields. By shifting up the zero point of gradient fields, the designed new Y-gradient coil could provide enhanced electromagnetic performances. With more uniform coil winding arrangement, the net torque of the new coil is significantly reduced and the generated sound pressure level (SPL) is lower at most tested frequency bands. On the other hand, the new transverse gradient coil designed with rotated magnetic gradient fields produces considerably reduced electric field in the human body, which is important for the use of rapid MR sequences. It's demonstrated that a safer and patient-friendly design could be obtained by using transformed magnetic gradient fields, which is critical for practical use.</div></div>","PeriodicalId":93594,"journal":{"name":"Magnetic Resonance Letters","volume":"5 1","pages":"Article 200139"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609283","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

In-cell dehydration of sodium manganese hexacyanoferrate cathode revealed by solid-state NMR 固态核磁共振揭示六氰合铁酸钠阴极的电池内脱水现象

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-05-07 DOI: 10.1016/j.mrl.2024.200135

Zonglin Li , Xiaobing Lou , Shinuo Kang , Dingming Liu , Fushan Geng , Ming Shen , Bingwen Hu

引用次数: 0

OFC: Outside Front Cover OFC：外封面

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2025-03-13 DOI: 10.1016/S2772-5162(25)00006-3

引用次数: 0

Light-induced nuclear spin hyperpolarization at high magnetic fields 强磁场下光诱导核自旋超极化

Magnetic Resonance Letters Pub Date : 2025-02-01 Epub Date: 2024-10-29 DOI: 10.1016/j.mrl.2024.200158

Yi Ji, Guangjin Hou

引用次数: 0