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887 results for “relaxation”
Pulse sequences for measurement of magnetization exchange and effective 1H relaxation rates in condensed phase
<p>- ddHSQC based 4D pulse sequence for measurement of magnetization exchange in condensed phase samples, using gradients for coherence selection. Processing scripts for processing the data. </p> <p>- ddHMQC based 3D pulse sequence for measurement of effective proton transverse relaxation rates in condensed phase samples, using gradients for coherence selection</p> <p> </p>
Dataset: In-vivo characterization of magnetic inclusions in the subcortex from non-exponential transverse relaxation decay
<p>This repository includes the data used to compile the results presented in the scientific publication: "In-vivo characterization of magnetic inclusions in the subcortex from non-exponential transverse relaxation decay".</p> <p>Rita Oliveira, Antoine Lutti<br>Laboratory for Research in Neuroimaging (LREN)<br>Department of Clinical Neuroscience, Lausanne University Hospital and University of Lausanne<br>Mont-Paisible 16, CH-1011 Lausanne, Switzerland<br><br>Classically, the MRI transverse relaxation decay is analyzed by fitting the signal decay over echo time voxel-wise with a monoexponential function (Exp), for which a decay rate R<sub>2</sub><sup>∗</sup> is estimated. However, the presence of magnetic material within the tissue, such as iron-loaded cells, myelin, or blood vessels, introduces variations in the magnetic field, which can modify the exponential behaviour of the decay (1,2). In such inhomogeneous magnetic fields, the theory predicts a transient regime starting with a Gaussian behaviour at short echo times and approaching a monoexponential relaxation at long echo times (1,3–6).<br>We highlight three different analytical descriptions of the signal decay that account for the transient regime of the transverse relaxation decay: i) the Anderson and Weiss, 1953 model (AW); ii) the Jensen and Chandra, 2000 model/Sukstanskii and Yablonskiy, 2003 model (SY; in the article is called JC); iii) and following a Padé approximation (Padé) of the transition from Gaussian to exponential decay.<br>This repository includes transverse relaxation decay data that enables the observation of the non-exponential MRI transverse relaxation. The data was acquired from 5 healthy volunteers at 3T. AW, SY, Padé, and Exp are the different methods that we used to fit the data with. Here we focus on the analysis of subcortical brain regions: Substantia Nigra, Pallidum, Putamen, Caudate, and Thalamus.</p> <p><strong>Data Description</strong><br>The necessary files to compile the results presented in the scientific publication can be found in the ‘<em>multiecho</em>’ folder. There are three different folders corresponding to three repetitions of the acquisition (‘rep1’ to ‘rep3’). The data consists of:<br>• resc_den_ subject_name_N.nii: magnitude image file corresponding to echo N. These files were previously denoised and rescaled (resc_den). The description field of the header of the images contains the corresponding TE at which the image was acquired, which will be needed in the fitting routine. Since we focus on the analysis of subcortical brain regions (Substantia Nigra, Pallidum, Putamen, Caudate, and Thalamus), the multi-echo data is masked within this region.<br>• nf: value of the noise floor level. Corresponds to the noncentrality parameter of a Rician distribution fitted to the background signal.</p> <p>In the ‘<em>anat</em>’ folder the user has access to:<br>• MT: Magnetization Transfer map (MTsat) that serves as a reference anatomical image.<br>• ROI folder: contains masks of each of the 5 regions of interest analyzed in the scientific paper: Substantia Nigra, Pallidum, Putamen, Caudate, and Thalamus.</p> <p><br>The ‘<em>modelfits</em>’ folder contains pre-computed results for each subject analyzed. If the user uses the analysis code that comes along with this dataset (<a href="https://github.com/LREN-physics/TransverseRelaxation">https://github.com/LREN-physics/TransverseRelaxation</a>), this folder will be overwritten with the new results. For each method (‘AW’, ‘SY’, ‘Pade’, ‘Exp’) there is a folder containing the corresponding resulting maps. These maps are:<br>• R2s.nii: map of R<sub>2,micro</sub><sup>∗</sup> [ms<sup>-1</sup>] for ‘AW’, ‘SY’, and ‘Pade’ options. Map of R<sub>2</sub><sup>∗</sup> [ms<sup>-1</sup>] for ‘Exp’ fit.<br>• OmegaSq.nii: map of 〈\(\Omega^2\) [rad<sup>2</sup> ms<sup>-2</sup>]. Not available for ‘Exp’ fit.<br>• TE0signal.nii: map of the initial signal amplitude S<sub>0</sub>.<br>• T2mol.nii: map of the inverse of effective transverse relaxation rate resulting from processes on the nanoscale [ms]<br>• AIC.nii: map of Akaike information criterion regarding the fitting procedure.<br>• MSE.nii: maps of the mean square error of the fitting procedure.<br>• DataMatrix.mat: matrix containing the data used for the fitting procedure.<br>• VoxelIndices.mat: vector containing the indices of the voxels corresponding to the analyzed data, which is restricted to the subcortical regions.<br>• Params.mat: structure containing the parameters used for the analysis.<br>Inside ‘modelfits’ there are also two folders corresponding to two different regimes that can describe the transverse relaxation decay: static dephasing regime (‘SDR’) or diffusion narrowing regime (‘DNR’). Under the assumption of SDR, we computed:<br>• ki_ppm.nii: maps of 𝛥𝜒, which is the difference in susceptibility of the magnetic inclusions to the surrounding tissue [addimentional, in ppm and in SI units]<br>• zeta.nii: maps of 𝜁, which is the volume fraction of the magnetic inclusions [addimentional]<br>Under the assumption of DNR, we computed:<br>• alpha.nii: 𝛼=𝜏〈\(\sqrt{\Omega^2}\)〉 [addimentional]<br>• tau_ms.nii: maps of 𝜏, which is the time scale for water molecules to diffuse away from magnetic inclusions [ms]<br>Please refer to the corresponding article for a complete description of the methods and corresponding estimated parameters.</p>
Chemically induced deceleration of nuclear spin relaxation (CIDER) preserves hyperpolarization
<p>This data corresponds to the following paper:</p> <p>Title: Chemically induced deceleration of nuclear spin relaxation (CIDER) preserves hyperpolarization<br>Journal: Angwandte Chemie<br>Authors: Josh P. Peters, Charbel Assaf, Arne Brahms, Kolja Them, Mirco Gerdsen, Rainer Herges, Jan-Bernd Hövener, Andrey N. Pravdivtsev</p> <p>The data is organized with respect to the subfigures in figure 2 and figure 3 as a whole. Data not shown in figures is placed in Supplement.<br>An overview about the experiments is given in "Experiment overview.xlsx", while the extracted data for each figure is summarized in "Analyzed data.xlsx"<br>A description of acquisition parameters is provided in the "Acquisition parameters.xlsx" file for each dataset.</p>
Supplementary data to the paper "Large scale voxel-based FEM formulation for NMR relaxation in porous media"
<p>This repository contains supplementary data to the paper "Large scale voxel-based FEM formulation for NMR relaxation in porous media", which is being considered for publication. The files are:<br><br>**_data.zip - Binary image files;</p> <p>FEM_T2_**.csv - T2 simulation results using finite elements;</p> <p>FEM_**_inv.csv - T2 inversion for the finite element simulations;</p> <p>RW_T2_**.csv - T2 simulation results using random walk;</p> <p>RW_**_inv.csv - T2 inversion for the random walk simulations;</p> <p>local_digital_correction.c - Vector containing the local geometry correction factors, accessed integers formed by the 8-bit binary key of the node neighborhood;</p> <p>Where ** is the rock type:</p> <p>AC - Austin Chalk</p> <p>BS - Berea Stripe</p> <p>DP - Desert Pink</p> <p>IB - Idaho Brown</p> <p>Obs.: in order to obtain the relaxation curves the following parameters were utilized in the simulations:</p> <p>Bulk diffusivity: 2500 micro-m2/s (all rock samples) </p> <p>Bulk relaxation: 2.6 s (all rock samples)</p> <p>Voxel size: {1.0; 2,0; 0.9; 2.0} micro-m (for AC, BS, DP, IB respectively)</p> <p>Surface relaxivity: {23.3; 12.1; 12.3; 8.3} micro-m/s (for AC, BS, DP, IB respectively)</p>
Spatiotemporal dominance of afterslip and viscoelastic relaxation revealed by four decades of post-1973 Luhuo earthquake observations
<p>The datasets include: (1) post-processed fault-crossing short baseline data; (2) triangulation data; (3) coseismic slip models of the Zhuwo and Luhuo earthquakes; and (4) afterslip model of the Luhuo earthquake.</p>
Diffusion-relaxation MRI data from biomimetic phantoms
<p>Diffusion-relaxation MRI data and tools to estimate the inner fibre radius of biomimetic phantoms, as reported here:</p> <blockquote> <p><strong>Pore size estimation in axon-mimicking microfibers with diffusion-relaxation MRI</strong>. Erick J. Canales-Rodríguez, Marco Pizzolato, Feng-Lei Zhou, Muhamed Barakovic, Jean-Philippe Thiran, Derek K. Jones, Geoffrey J.M. Parker, Tim B. Dyrby. Magn Reson Med. 2024; 91: 2579-2596. doi: 10.1002/mrm.29991 <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.29991" rel="nofollow">https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.29991</a></p> </blockquote> <p>Run the code to replicate the figures reported in the paper. We provide the raw diffusion-relaxation data (spherical mean signal) to facilitate future evaluations and developments.</p> <p> </p> <p> </p>
Obliteration of ancient impact basins on the Moon by viscous relaxation
<p>This dataset includes all the raw data for the figures and extended data figures in the manuscript titled "Obliteration of ancient impact basins on the Moon by viscous relaxation".</p>
Data from "Relaxed alertness in novice and advanced meditators – A neurophysiological and psychological study of Isha Yoga practices"
<p>This dataset contains EEG power spectral data, statistical values and codes used for the findings of the paper titled:</p> <p>"Relaxed alertness in novice and advanced meditators – A neurophysiological and psychological study of Isha Yoga practices", accepted for publication in Mindfulness Journal.</p> <p>Authored by Saketh Malipeddi, Arun Sasidharan, Ravindra P.N., Seema Mehrotra, John P John and Bindu M. Kutty</p> <p>from Centre for Consciousness Studies, Department of Neurophysiology, NIMHANS, Bengaluru, India</p> <p> </p> <p> </p> <p><br> </p>
Data and codes for "Habitat structural complexity increases age-class coexistence and population growth rate through relaxed cannibalism in medaka fish"
<p>The zip file contains readme files, as well as data and codes to reproduce results and figures from the paper.</p>
X-ray transient absorption reveals the 1Au (nπ*) state of pyrazine in electronic relaxation, data files
<p>Electronic relaxation in organic chromophores often proceeds via states not directly accessible by photoexcitation. We report on the photoinduced dynamics of pyrazine that involves such states, excited by a 267 nm laser and probed with X-ray transient absorption spectroscopy in a table-top setup. In addition to the previously characterized <sup>1</sup>B<sub>2u</sub> (ππ*) (S<sub>2</sub>) and <sup>1</sup>B<sub>3u</sub> (nπ*) (S<sub>1</sub>) states, the participation of the optically dark <sup>1</sup>A<sub>u</sub> (nπ*) state is assigned by a combination of experimental X-ray core-to-valence spectroscopy, electronic structure calculations, nonadiabatic dynamics simulations, and X-ray spectral computations. </p> <p>The present material contains files produced in the course of data acquisition and the output of the theoretical simulations.</p>
Data for "Relaxing Hardware Requirements for Surface Code Circuits using Time-dynamics"
<p>Includes the circuit files for each benchmarked stim circuit (circuits.zip), the raw statistics for each memory experiment (stats.csv), the 'fused' stats combining the X and Z error rates to represent the liklihood that neither logical observable fails (fused_stats.csv), the svg files for the main figures in the manuscript (svg_figures.zip), and a snapshot of the full code repo (midout.zip)</p>
Molecular profiling of sponge deflation reveals an ancient relaxant-inflammatory response
<p>A hallmark of animals is the coordination of whole-body movement. Neurons and muscles are central to this, yet coordinated movements also exist in sponges that lack these cell types. Sponges are sessile animals with a complex canal system for filter-feeding. They undergo whole-body movements resembling “contractions'' that lead to canal closure and water expulsion. Here, we combine 3D optical coherence microscopy, pharmacology, and functional proteomics to elucidate anatomy, molecular physiology, and control of these movements. We show that they are driven by the relaxation of actomyosin stress fibers in epithelial canal cells, which leads to whole-body deflation via collapse of the incurrent and expansion of the excurrent system, controlled by an Akt/NO/PKG/A pathway. A concomitant increase in reactive oxygen species and secretion of proteinases and cytokines indicate an inflammation-like state reminiscent of vascular endothelial cells experiencing oscillatory shear stress. This suggests an ancient relaxant-inflammatory response of perturbed fluid-carrying systems in animals.</p> <p>File descriptions:</p> <ul> <li>pharma_*.avi: Exemplary videos for pharmacological treatments of Spongilla <em>lacustris</em>, related to Fig. 2</li> <li>OCM_tomographic_scan: 2D scan through an unsegmented sponge body. First a x-z scan, afterwards a x-y scan. </li> <li>ink_treatment_suppl_figS3.mov: Video of ink treated <em>Spongilla lacustris</em> specimen, related to Fig. S3</li> <li>S_lacustris_annotations_emapper: EggNOG mapper (v2.1.9) results used for GO term enrichment analysis</li> <li>S_lacustris_proteome: Proteome file used as database for proteomic searches</li> <li>S_lacustris_scRNAseq.h5ad: file containing scRNAseq and cell type information of <em>Spongilla lacustris.</em> </li> <li>Suppl_file_*.xlsx: Tables of proteomics (TPP, phophoproteomics, secretomics) results</li> </ul>
Understanding the effect of structural changes on slow magnetic relaxation in mononuclear octahedral copper(ii) complexes
<p>Current advances in molecular magnetism are aimed at the construction of molecular nanomagnets and spin qubits for their utilization as high-density data storage materials and quantum computers. Mononuclear coordination compounds with low spin values of <em>S</em> = ½ are excellent candidates for this endeavour, but knowledge of their construction <em>via</em> rational design is limited. This particularly applies to the single copper(II) spin center, having been only recently demonstrated to exhibit slow relaxation of magnetisation in the appropriate octahedral environment. We have thus prepared a unique organic scaffold that would allow one to gain in-depth insight into how purposeful structural differences affect the slow magnetic relaxation in monometallic, transition metal complexes. As a proof-of-principle, we demonstrate how one can construct two, structurally very similar complexes with isolated Cu(II) ions in an octahedral ligand environment, the magnetic properties of which differ significantly. The differences in structural symmetry effects and in magnetic relaxation are corroborated with a series of experimental techniques and theoretical approaches, showing how symmetry distortions and crystal packing affect the relaxation behaviour in these isolated Cu(II) systems. Our unique organic platform can be efficiently utilized for the construction of various transition-metal ion systems in the future, effectively providing a model system for investigation of magnetic relaxation <em>via</em> targeted structural distortions.</p>
Magic Angle Spinning Effects on Longitudinal NMR Relaxation: 15N in L-Histidine
<p>Experimental datasets for the publication entitled: Magic Angle Spinning Effects on Longitudinal NMR Relaxation: <sup>15</sup>N in L-Histidine</p>
Spin Relaxation of Electron and Hole Polarons in Ambipolar Conjugated Polymers. DataSet
<p>Source Data Set for the publication entitled: "Spin Relaxation of Electron and Hole Polarons in Ambipolar Conjugated Polymers"</p>
A Prospective Study Investigating the Use of Relaxation Prior to Medical Procedures.
ClinicalTrials.gov study NCT02690194. IPD Sharing: NO. Countries: 1. Publications: 8.
Effects of Sleep Hygiene Education and Progressive Relaxation Exercise on Anxiety, Sleep Quality and Glycemic Control in Diabetic Patients
ClinicalTrials.gov study NCT06960408. IPD Sharing: NO. Countries: 0. Publications: 0.
Responsiveness to Acute Changes in Exercise and Relaxation (RACER) Trial
ClinicalTrials.gov study NCT03702712. IPD Sharing: YES. Countries: 1. Publications: 1.
Acupuncture and Relaxation Response for GI Symptoms and HIV Medication Adherence
ClinicalTrials.gov study NCT00545623. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Deep Versus Moderate Muscle Relaxation During Laparoscopic Donor Nephrectomy in Enhancing Postoperative Recovery
ClinicalTrials.gov study NCT02838134. IPD Sharing: NO. Countries: 1. Publications: 4.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.