keyword
https://read.qxmd.com/read/38536580/impact-of-harmonization-on-the-reproducibility-of-mri-radiomic-features-when-using-different-scanners-acquisition-parameters-and-image-pre-processing-techniques-a-phantom-study
#1
JOURNAL ARTICLE
Ghasem Hajianfar, Seyyed Ali Hosseini, Sara Bagherieh, Mehrdad Oveisi, Isaac Shiri, Habib Zaidi
This study investigated the impact of ComBat harmonization on the reproducibility of radiomic features extracted from magnetic resonance images (MRI) acquired on different scanners, using various data acquisition parameters and multiple image pre-processing techniques using a dedicated MRI phantom. Four scanners were used to acquire an MRI of a nonanatomic phantom as part of the TCIA RIDER database. In fast spin-echo inversion recovery (IR) sequences, several inversion durations were employed, including 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, and 3000 ms...
March 27, 2024: Medical & Biological Engineering & Computing
https://read.qxmd.com/read/38513444/electroactive-nanofibrous-membrane-with-antibacterial-and-deodorizing-properties-for-air-filtration
#2
JOURNAL ARTICLE
Yuejie Dou, Na Wang, Shaohua Zhang, Caihong Sun, Jinmiao Chen, Zhenghai Qu, Aihua Cui, Jiwei Li
Water vapor from respiration can severely accelerate the charge dissipation of the face mask, reducing filtration efficiency. Moreover, the foul odor from prolonged mask wear tends to make people remove their masks, leading to the risk of infection. In this study, an electro-blown spinning electroactive nanofibrous membrane (Zn/CB@PAN) with antibacterial and deodorization properties was prepared by adding zinc (Zn) and carbon black (CB) nanoparticles to the polyacrylonitrile (PAN) nanofibers, respectively. The filtration efficiency of Zn/CB@PAN for PM0...
March 19, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38511660/contrast-dependence-of-scattering-profiles-for-poly-ethylene-glycol-in-water-investigation-by-small-angle-neutron-scattering-with-3he-spin-filter-and-small-angle-x-ray-scattering
#3
JOURNAL ARTICLE
Akiyuki Ryoki, Fumi Watanabe, Takuya Okudaira, Shingo Takahashi, Takayuki Oku, Kosuke Hiroi, Ryuhei Motokawa, Yo Nakamura
The small-angle neutron scattering (SANS) and small-angle x-ray scattering (SAXS) measurements were performed for deuterated and non-deuterated poly(ethylene glycol) (d-PEG and h-PEG, respectively) in D2O and a D2O/H2O mixed solvent (Mix) to compare the scattering profiles. To determine the coherent scattering intensity of SANS, a 3He spin filter was utilized. The scattering profiles determined by the SANS measurements were analyzed in terms of the wormlike chain model with touched beads along the contour of the chain...
March 21, 2024: Journal of Chemical Physics
https://read.qxmd.com/read/38499551/ultrafast-magnetization-enhancement-via-the-dynamic-spin-filter-effect-of-type-ii-weyl-nodes-in-a-kagome-ferromagnet
#4
JOURNAL ARTICLE
Xianyang Lu, Zhiyong Lin, Hanqi Pi, Tan Zhang, Guanqi Li, Yuting Gong, Yu Yan, Xuezhong Ruan, Yao Li, Hui Zhang, Lin Li, Liang He, Jing Wu, Rong Zhang, Hongming Weng, Changgan Zeng, Yongbing Xu
The magnetic type-II Weyl semimetal (MWSM) Co3 Sn2 S2 has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism. However, the dynamic magnetic properties remain relatively unexplored. Here, we investigate the ultrafast spin dynamics of Co3 Sn2 S2 crystal using time-resolved magneto-optical Kerr effect and reflectivity spectroscopies. We observe a transient magnetization behavior, consisting of spin-flipping dominated fast demagnetization, slow demagnetization due to overall half-metallic electronic structures, and an unexpected ultrafast magnetization enhancement lasting hundreds of picoseconds upon femtosecond laser excitation...
March 18, 2024: Nature Communications
https://read.qxmd.com/read/38483125/perfusion-imaging-by-arterial-spin-labeling-in-migraine-a-literature-review
#5
REVIEW
Severin Schramm, Corinna Börner, Miriam Reichert, Gabriel Hoffmann, Stephan Kaczmarz, Michael Griessmair, Kirsten Jung, Maria T Berndt, Claus Zimmer, Thomas Baum, Florian Heinen, Michaela V Bonfert, Nico Sollmann
Arterial spin labeling (ASL) is a non-invasive magnetic resonance imaging (MRI) method for the assessment of cerebral blood flow (CBF). This review summarizes recent ASL-based investigations in adult and pediatric patients with migraine with aura, migraine without aura, and chronic migraine. A systematic search according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines was conducted within PubMed and reference sections of articles identified from April 2014 to November 2022...
March 14, 2024: Journal of Cerebral Blood Flow and Metabolism
https://read.qxmd.com/read/38452523/high-efficiency-low-power-13-c-15-n-cross-polarization-in-mas-nmr
#6
JOURNAL ARTICLE
Gal Porat-Dahlerbruch, Jochem Struppe, Tatyana Polenova
Biomolecular solid-state magic angle spinning (MAS) NMR spectroscopy frequently relies on selective 13 C-15 N magnetization transfers, for various kinds of correlation experiments. Introduced in 1998, spectrally induced filtering in combination with cross polarization (SPECIFIC-CP) is a selective heteronuclear magnetization transfer experiment widely used for biological applications. At MAS frequencies below 20 kHz, commonly used for 13 C-detected MAS NMR experiments, SPECIFIC-CP transfer between amide 15 N and 13 Cα atoms (NCA) is typically performed with radiofrequency (rf) fields set higher than the MAS frequency for both 13 C and 15 N channels, and high-power 1 H decoupling rf field is simultaneously applied...
February 23, 2024: Journal of Magnetic Resonance
https://read.qxmd.com/read/38418379/covalent-organic-frameworks-with-tunable-chirality-for-chiral-induced-spin-selectivity
#7
JOURNAL ARTICLE
Xing Han, Chao Jiang, Bang Hou, Yan Liu, Yong Cui
Chiral covalent organic frameworks (CCOFs) have attracted extensive interest for their potential applications in various enantioselective processes. However, the exploitation of chirality-induced spin selectivity (CISS) that enables a new technology for the injection of spin polarized current without the need for a permanent magnetic layer within CCOFs remains a largely untapped area of research. Here, we demonstrate that, for the first time, COFs can be an attractive platform to develop spin filter materials with efficient CISS...
February 28, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38417154/selective-detection-of-intermediate-amplitude-motion-by-solid-state-nmr
#8
JOURNAL ARTICLE
Pu Duan, Mei Hong
The coexistence of rigid and mobile molecules or molecular segments abounds in biomolecular assemblies. Examples include the carbohydrate-rich cell walls of plants and intrinsically disordered proteins that contain rigid β-sheet cores. In solid-state nuclear magnetic resonance (NMR) spectroscopy, dipolar polarization transfer experiments are well suited for detecting rigid components, whereas scalar-coupling experiments are well suited for detecting highly mobile components. However, few NMR methods are available to detect the segments that undergo intermediate-amplitude fast motion...
February 28, 2024: Journal of Physical Chemistry. B
https://read.qxmd.com/read/38408317/twisted-dna-origami-based-chiral-monolayers-for-spin-filtering
#9
JOURNAL ARTICLE
Haozhi Wang, Fangfei Yin, Lingyun Li, Mingqiang Li, Zheng Fang, Chenyun Sun, Bochen Li, Jiye Shi, Jiang Li, Lihua Wang, Shiping Song, Xiaolei Zuo, Xiaoguo Liu, Chunhai Fan
DNA monolayers with inherent chirality play a pivotal role across various domains including biosensors, DNA chips, and bioelectronics. Nonetheless, conventional DNA chiral monolayers, typically constructed from single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA), often lack structural orderliness and design flexibility at the interface. Structural DNA nanotechnology has emerged as a promising solution to tackle these challenges. In this study, we present a strategy for crafting highly adaptable twisted DNA origami-based chiral monolayers...
February 26, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38396456/diagnosis-of-delayed-post-hypoxic-leukoencephalopathy-grinker-s-myelinopathy-with-mri-using-divided-subtracted-inversion-recovery-dsir-sequences-time-for-reappraisal-of-the-syndrome
#10
JOURNAL ARTICLE
Gil Newburn, Paul Condron, Eryn E Kwon, Joshua P McGeown, Tracy R Melzer, Mark Bydder, Mark Griffin, Miriam Scadeng, Leigh Potter, Samantha J Holdsworth, Daniel M Cornfeld, Graeme M Bydder
Background: Delayed Post-Hypoxic Leukoencephalopathy (DPHL), or Grinker's myelinopathy, is a syndrome in which extensive changes are seen in the white matter of the cerebral hemispheres with MRI weeks or months after a hypoxic episode. T2 -weighted spin echo (T2 -wSE) and/or T2 -Fluid Attenuated Inversion Recovery (T2 -FLAIR) images classically show diffuse hyperintensities in white matter which are thought to be near pathognomonic of the condition. The clinical features include Parkinsonism and akinetic mutism...
February 14, 2024: Diagnostics
https://read.qxmd.com/read/38369688/analysis-of-complex-mixtures-with-benchtop-nuclear-magnetic-resonance-solvent-suppression-with-t-2-and-diffusion-filters
#11
JOURNAL ARTICLE
Anh Le-McClain, Curt Zanelotti, Hector Robert, Federico Casanova
Benchtop nuclear magnetic resonance (NMR) spectrometers are being employed in a wide variety of applications from undergraduate teaching and research in academia to quality control and process monitoring in industrial settings. Incorporating benchtop NMR in some of these applications presents opportunities for new practical uses of the technology and challenges that truly test the capabilities of compact NMR spectrometers. For instance, the use of protonated solvents in manufacturing or process monitoring requires separating and quantitating the analyte signals of interest from the strong (overwhelming) response from the solvents...
February 18, 2024: Magnetic Resonance in Chemistry: MRC
https://read.qxmd.com/read/38364021/chiral-induced-spin-selectivity
#12
REVIEW
Brian P Bloom, Yossi Paltiel, Ron Naaman, David H Waldeck
Since the initial landmark study on the chiral induced spin selectivity (CISS) effect in 1999, considerable experimental and theoretical efforts have been made to understand the physical underpinnings and mechanistic features of this interesting phenomenon. As first formulated, the CISS effect refers to the innate ability of chiral materials to act as spin filters for electron transport; however, more recent experiments demonstrate that displacement currents arising from charge polarization of chiral molecules lead to spin polarization without the need for net charge flow...
February 16, 2024: Chemical Reviews
https://read.qxmd.com/read/38313477/-43-ca-mas-dnp-nmr-of-frozen-solutions-for-the-investigation-of-calcium-ion-complexation
#13
JOURNAL ARTICLE
Tristan Georges, Romain Chèvre, Samuel F Cousin, Christel Gervais, Pierre Thureau, Giulia Mollica, Thierry Azaïs
Calcium ion complexation in aqueous solutions is of paramount importance in biology as it is related to cell signaling, muscle contraction, or biomineralization. However, Ca2+ -complexes are dynamic soluble entities challenging to describe at the molecular level. Nuclear magnetic resonance appears as a method of choice to probe Ca2+ -complexes. However, 43 Ca NMR exhibits severe limitations arising from the low natural abundance coupled to the low gyromagnetic ratio and the quadrupolar nature of 43 Ca, which overall make it a very unreceptive nucleus...
January 30, 2024: ACS Omega
https://read.qxmd.com/read/38287775/prediction-of-diabetes-insipidus-occurrence-after-endoscopic-endonasal-removal-of-sellar-lesions-using-mri-based-radiomics-and-machine-learning
#14
JOURNAL ARTICLE
Ciro Mastantuoni, Lorenzo Ugga, Domenico Solari, Serena D'Aniello, Gaia Spadarella, Renato Cuocolo, Filippo F Angileri, Luigi M Cavallo
BACKGROUND: Pituitary adenomas and craniopharyngiomas are the most common lesions of the sellar region. These tumors are responsible for invasion or compression of crucial neurovascular structures. The involvement of the pituitary stalk warrants high rates of both pre- and post- operative diabetes insipidus. The aim of our study was to assess the accuracy of machine learning analysis from preoperative MRI of pituitary adenomas and craniopharyngiomas for the prediction of DI occurrence...
January 29, 2024: Journal of Neurosurgical Sciences
https://read.qxmd.com/read/38268176/first-report-of-hibiscus-chlorotic-ringspot-virus-infecting-hibiscus-rosa-sinensis-in-italy
#15
JOURNAL ARTICLE
Giuseppe Parrella, Anna Mignano
Hibiscus chlorotic ringspot virus (HCRSV) belongs to the Betacarmovirus genus of the Tombusviridae family and is a positive-sense monopartite single-stranded RNA virus. HCRSV was first described in a hibiscus variety imported into the United States from El Salvador. The HCRSV natural host range is limited to species belonging to Malvaceae family, in particular Hibiscus rosa-sinensis, H. manihot, H. diversifolius and H. syriacus. In September 2023, leaf mottle and chlorotic spots were observed on the leaves of two H...
January 24, 2024: Plant Disease
https://read.qxmd.com/read/38265086/spin-polarized-electrical-transport-properties-of-organic-radicals-in-presence-of-zigzag-graphene-nanoribbon-leads
#16
JOURNAL ARTICLE
Sudip Sarkar, Ameet Kumar, Daeheum Cho
The present work delves into the spin-polarized transport property of organic radicals sandwiched between two zigzag-graphene nanoribbon (ZGNR) electrodes by employing density functional theory and nonequilibrium Green's function technique. We demonstrated that the magnetic center(s) of the radical can manipulate the localized edge states of the ZGNR in the scattering region, causing ferromagnetic coupling. Such manipulation of the magnetic edges results in a high spin-filter effect in molecular junctions, and even the antiferromagnetic diradicals serve as nearly perfect spin filters...
January 28, 2024: Journal of Chemical Physics
https://read.qxmd.com/read/38263478/transport-properties-with-multiple-functions-of-fe-c60-gnr-single-molecule
#17
JOURNAL ARTICLE
Xiaohui Liu, Yangyang Hu, Lu Han, Yuqi Dong, Munir Ur Rehman, Yan Shang, Zhaodi Yang, Ya Wang, Lei Pei, Hong Yu, Guiling Zhang
Encouraged by the successful fabrication of C60-GNR (GNR = graphene nanoribbon) single-molecule transistors in experiments, four Fe-containing derived double-layered devices of Fe@C60-GNR are designed by employing different electrode linkages and their transport properties are investigated by using density functional theory (DFT) and nonequilibrium Green's function (NEGF) methods. Regardless of electrode connection, all devices give rise to a smaller negative differential resistance (NDR) peak at V=0.2 and a higher peak at 1...
January 23, 2024: Chemistry: a European Journal
https://read.qxmd.com/read/38230986/highly-efficient-fabrication-of-biomimetic-nanoscaled-tendrils-for-high-performance-pm-0-3-air-filters
#18
JOURNAL ARTICLE
Tienan Zhao, Yuanqiang Xu, Mengwei Wu, Ying Li, Jiajia Ma, Hui Li, Yuansheng Zheng, Yongchun Zeng
Particulate matter pollution has become a serious public health issue, especially with the outbreak of new infectious diseases. However, most existing air filtration materials face challenges such as being too bulky, having high resistance, and a trade-off between filtration efficiency and air permeability. Here, a unique electro-blown spinning technique is used to prepare an air filter made of biomimetic nanoscaled tendril nonwovens (Nano-TN). The introduction of an airflow field significantly increases the whipping frequency and the strain mismatch of composite jets, achieving large-scale and highly efficient preparation of Nano-TN...
January 17, 2024: Nano Letters
https://read.qxmd.com/read/38230873/receive-coil-quality-assurance-procedure-and-automated-analysis-for-viewray-mridian-mr-linac
#19
JOURNAL ARTICLE
Evangelia Kaza, Christopher L Williams
PURPOSE: Regular receiving coil quality assurance (QA) is required to ensure image quality of an MRIdian Linac system. The manufacturer provides a spherical phantom and positioning tube for single-slice signal-to-noise ratio (SNR) and uniformity assessments. We aimed to improve imaging setup and coverage and eliminate inter-scan variability by employing multi-slice imaging of a stable phantom. Additionally, we strived to expedite analysis by developing objective, automated analysis software...
January 17, 2024: Journal of Applied Clinical Medical Physics
https://read.qxmd.com/read/38216104/vessel-density-mapping-of-small-cerebral-vessels-on-3d-high-resolution-black-blood-mri
#20
JOURNAL ARTICLE
Mona Sharifi Sarabi, Samantha J Ma, Kay Jann, John M Ringman, Danny J J Wang, Yonggang Shi
Small cerebral blood vessels are largely inaccessible to existing clinical in vivo imaging technologies. This study aims to present a novel analysis pipeline for vessel density mapping of small cerebral blood vessels from high-resolution 3D black-blood MRI at 3T. Twenty-eight subjects (10 under 35 years old, 18 over 60 years old) were imaged with the T1-weighted turbo spin-echo with variable flip angles (T1w TSE-VFA) sequence optimized for black-blood small vessel imaging with iso-0.5 mm spatial resolution (interpolated from 0...
January 11, 2024: NeuroImage
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