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Magnetic properties

Javier E Rosa, Santiago Ruta, Maximiliano Bravo, Luciano Pompermayer, Josefina Marin, Leandro Ferreyra-Garrot, Ricardo García-Mónaco, Enrique R Soriano
OBJECTIVE: To evaluate the diagnostic value of color Doppler ultrasound (CDUS) for the detection of sacroiliitis, in patients with inflammatory back pain (IBP). METHODS: Consecutive patients with IBP and suspected axial spondyloarthritis (SpA), but without a definitive diagnosis, were included. Consecutive patients with defined SpA and axial involvement were included as a control group. All patients underwent clinical evaluation, magnetic resonance imaging (MRI), and CDUS of sacroiliac joints (SIJ) within the same week...
December 15, 2018: Journal of Rheumatology
Ceren Bayraç, Gülnur Camızcı
Patulin is a naturally produced toxin having potential carcinogenic properties. It is mainly produced by species of Penicillium growing on fruits, especially on apples. Detoxification of patulin, therefore, is very important for providing food safety. In this study, sulfhydryl-terminated, silica coated iron oxide beads were investigated as a multi-use sorbents for effective recovery of patulin from apple juice. The effect of beads amount, contact time, pH and temperature were evaluated for high adsorption capacity and the results showed maximum adsorption capacity at a reaction condition of 1...
December 3, 2018: Journal of Hazardous Materials
Congyu Wu, Megan E Muroski, Jason Miska, Catalina Lee-Chang, Yajing Shen, Aida Rashidi, Peng Zhang, Ting Xiao, Yu Han, Aurora Lopez-Rosas, Yu Cheng, Maciej S Lesniak
Although radiotherapy has been established as a major therapeutic modality for glioma, radical new avenues are critically needed to prevent inevitable tumor recurrence. Herein, we utilized a magnetic nanoparticle-based platform with cationic polymer modification to promote radiotherapy for glioma treatment. We found that the nanoplatform induced cytotoxicity to glioma cells under radiation as well as promoting significant survival benefits in both immunocompetent and aythmic mice with glioma. Utilizing the magnetic properties of the nanoparticles, we were able to ascertain that myeloid derived suppressor cells (MDSC) were taking up nanoparticles in the brain tumor...
December 13, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Mohamadreza Massoudinejad, Hassan Rasoulzadeh, Mansour Ghaderpoori
Recovery of crystal violet (CV) dye was investigated using magnetic chitosan nano-composites (MCNCs) and the effects of process variables (contact time, initial CV concentration, adsorbent dose, and pH) were optimized through response surface methodology. The reliability of the RSM models (first-order model, first model with interaction, the second-order model, and reduced model) was tested by fitting the data. A comparative analysis of the results derived from the models demonstrated that the reduced model was the best...
February 15, 2019: Carbohydrate Polymers
Alain Bourmaud, David Siniscalco, Loïc Foucat, Camille Goudenhooft, Xavier Falourd, Bruno Pontoire, Olivier Arnould, Johnny Beaugrand, Christophe Baley
Flax retting is a major bioprocess in the cultivation and extraction cycle of flax fibres. The aim of the present study is to improve the understanding of the evolution of fibre properties and ultrastructure caused by this process at the plant cell wall scale. Initially, investigations of the mechanical performances of the flax cell walls by Atomic Force Microscopy (AFM) in Peak Force mode revealed a significant increase (+33%) in the cell wall indentation modulus with retting time. Two complementary structural studies are presented here, namely using X-Ray Diffraction (XRD) and solid state Nuclear Magnetic Resonance (NMR)...
February 15, 2019: Carbohydrate Polymers
Tushar H Jaware, K B Khanchandani, Anita Zurani
BACKGROUND:  Segmentation of brain MR images of neonates is a primary step for assessment of brain evolvement. Advanced segmentation techniques used for adult brain MRI are not companionable for neonates, due to extensive dissimilarities in tissue properties and head structure. Existing segmentation methods for neonates utilizes brain atlases or requires manual elucidation, which results into improper and atlas dependent segmentation. OBJECTIVE:  The primary objective of this work is to develop fully automatic, atlas free, and robust system to segment and classify brain tissues of newborn infants from magnetic resonance images...
December 15, 2018: American Journal of Perinatology
Xicheng Liu, Yanhua Tang, Xiangdong He, Xingxing Ge, Jiao Liu, Xiaoyu Meng, Mingxiao Shao, Yingmin Jin, Laijin Tian, Zhe Liu
Four new triphenyltin(IV) acylhydrazone compounds of the type Ph3 SnCH2 CH2 CONHN=R (where Ph = phenyl; R = isopropyl, isobutyl, cyclopentyl and cyclooctyl) were synthesized and characterized by elemental analysis, infrared spectrum (IR), nuclear magnetic resonance spectrum (NMR) and mass spectrum (MS). The crystal structures were determined and showed that tin atoms were four-coordinated and adopted a pseudo-tetrahedron configuration. Tin(IV) compounds show excellent bovine serum albumin (BSA) binding properties, and can oxidize nicotinamide-adenine dinucleotid (NADH) to generate reactive oxygen species (ROS), which inducing apoptosis effectively...
November 24, 2018: Journal of Inorganic Biochemistry
Xiaowan Li, Xitao Liu, Chunye Lin, Huijuan Zhang, Zhou Zhou, Guoxuan Fan, Mengchang He, Wei Ouyang
Magnetic catalysts (MCs) derived from iron-rich drinking water treatment residuals (WTRs) were prepared through pyrolysis treatment and introduced as activators of peroxymonosulfate (PMS) for refractory atrazine (ATZ) degradation. Comprehensive characterization analysis indicated that pyrolytic temperature could manipulate the crystalline structure evolution of the MCs and influence their physicochemical and catalytic properties. The catalytic performances of the as-prepared samples pyrolyzed at 600 °C (MC-600) and 1000 °C (MC-1000) were evaluated, and MC-1000 exhibited far more excellent catalytic reactivity than MC-600 in PMS oxidation system...
December 5, 2018: Journal of Hazardous Materials
Yuqing Li, Jing Liu, Yingchun Fu, Qingji Xie, Yanbin Li
A self-sacrificing catalytic method is described for the preparation of magnetic core/dual-functional-shell nanocomposites composed of magnetite, gold and Prussian Blue (type Fe3 O4 @Au-PB). Two reaction pathways are integrated. The first involves chemical dissolution of Fe3 O4 (the self-sacrificing step) by acid to release ferrous ions which then reacts with hexacyanoferrate(IV) to generate PB in the proximity of the magntic nanoparticles (MNPs). The second involves the reduction of tetrachloroaurate by hydroxylamine to generate gold under the catalytic effect of the MNPs...
December 14, 2018: Mikrochimica Acta
Duy Khanh Nguyen, Ngoc Thanh Thuy Tran, Thanh Tien Nguyen, Ming-Fa Lin
The dramatic changes in electronic and magnetic properties are investigated using the first-principles calculations for halogen(X: Cl, Br, I, At)-adsorbed graphene nanoribbons. The rich and unique features are clearly revealed in the atoms-dominated electronic band structures, spin arrangement/magnetic moment, spatial charge distribution, and orbital- and spin-projected density of states. Halogen adsorptions can create the non-magnetic, ferromagnetic or anti-ferromagnetic metals, being mainly determined by concentrations and edge structures...
December 14, 2018: Scientific Reports
Jui-Cheng Chang, Che-Hsuan Yang, I-Wen Sun, Wen-Yueh Ho, Tzi-Yi Wu
A series of unique tunable aryl-imidazolium magnetic ionic liquids (MILs) with dual acidity that contain both Brønsted and Lewis acidic sites (abbreviated as B-L MILs) were synthesized and characterized using nuclear magnetic resonance and mass spectrometry. Physical properties, such as thermal properties, magnetic susceptibility, and Brønsted and Lewis acidity, were measured. These properties were found to depend on the cation structure. These B-L MILs had good solubility in many organic solvents, good thermal stability, and low melting points, and exhibited magnet-like behavior...
December 13, 2018: Materials
Agnes Beckmann, Christian Herren, Luis Fernando Nicolini, David Grevenstein, Stavros Oikonomidis, Philipp Kobbe, Frank Hildebrand, Marcus Stoffel, Bernd Markert, Jan Siewe
BACKGROUND: Posterior dynamic stabilization systems are developed to maintain the healthy biomechanics of the spine while providing stabilization. Numerous dynamic systems incorporate polycarbonate urethane with temperature- and moisture-dependent material properties. In the underlying study, a novel test rig is used to evaluate the biomechanical performance of a system containing polycarbonate urethane. METHODS: The test rig is composed of two hydraulic actuators...
December 6, 2018: Clinical Biomechanics
Dezhi Yang, Sai Kumar Tammina, Xiao Li, Yaling Yang
Magnetic nanoparticles (MNPs) have already proven their efficacy in the disposal of a wide array of environmental contaminants in recent years. However, the difficulties in dispersibility and agglomeration of MNPs arising from its own physical and chemical properties limit its large-scale application. Herein, we fabricated the carbon dots/fatty acid-coated MNPs (CDs/C11 -Fe3 O4 ) through a facile and simple method. To utilize the advantage of carbon dots, these limitations can be mitigated by diminishing the size of MNPs and modifying the surface of MNPs...
December 11, 2018: Ecotoxicology and Environmental Safety
Jiaji Pan, Shen Ren, Praveen KaliappanSekar, Ji Peng, Zhiquan Andy Shu, Gang Zhao, Weiping Ding, Ming Chen, Dayong Gao
The lack of effective rewarming technique restricted the successful cryopreservation of organ or large tissues by vitrification. The conversion of electromagnetic (EM) energy into heat provides a possible solution for the rewarming process for the cryopreservation. In this work, an EM resonance rewarming system was set up with dynamic feedback control and power feeding optimization. In addition, we take advantage of magnetic nanoparticles (MNPs) to absorb magnetic field energy to further enhance the energy conversion efficiency...
December 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Saeed Jerban, Yajun Ma, Lidi Wan, Adam C Searleman, Hyungseok Jang, Robert L Sah, Eric Y Chang, Jiang Du
Intracortical bone porosity is a key microstructural parameter that determines bone mechanical properties. While clinical MRI visualizes the cortical bone with a signal void, ultrashort echo time (UTE) MRI can acquire high signal from cortical bone, thus enabling quantitative assessments. Magnetization transfer (MT) imaging combined with UTE-MRI can indirectly assess protons in the bone collagenous matrix, which are inversely related to porosity. This study aimed to examine UTE-MT MRI techniques to evaluate intracortical bone porosity...
December 14, 2018: NMR in Biomedicine
G L Gutsev, K V Bozhenko, L G Gutsev, A N Utenyshev, S M Aldoshin
The geometrical structures and properties of the M8 O12 , M8 O12 H8 , and M8 O12 H12 clusters are explored using density functional theory with the generalized gradient approximation for all 3d-metals M from Sc to Zn. It is found that the geometries and total spin magnetic moments of the clusters depended strongly on the 3d-atom type and the hydrogenation extent. More than the half of all of the 30 clusters had singlet lowest total energy states, which could be described as either nonmagnetic or antiferromagnetic...
December 14, 2018: Journal of Computational Chemistry
Haishi Qiao, Jing Jia, Wei Chen, Bin Di, Oren A Scherman, Chi Hu
The fabrication, characterization, and therapy efficiency of a noncovalent-bonded hydrogel network, which is assembled by utilizing cucurbit[7]uril as a supramolecular linker to "stick" superparamagnetic γ-Fe2 O3 nanoparticles onto the polymer backbone of catechol-functionalized chitosan are described. The unique barrel-shaped structure of cucurbit[7]uril not only facilitates host-guest recognition with the catechol derivatives, but also forms robust electrostatic interactions between its carbonyl portals and the γ-Fe2 O3 nanoparticles in a supramolecular manner, which leaves the physical and chemical properties of the nanoparticles intact...
December 13, 2018: Advanced Healthcare Materials
Lena Scherthan, Sebastian F M Schmidt, Hendrik Auerbach, Tim Hochdörffer, Juliusz A Wolny, Bi Wenli, Jiyong Zhao, Michael Y Hu, Tom Toellner, E Ercan Alp, Dennis E Brown, Christopher E Anson, Annie K Powell, Volker Schünemann
Time-domain synchrotron Mössbauer spectroscopy (SMS) based on the Mössbauer effect of ¹⁶¹Dy has been used to investigate the magnetic properties of a DyIII-based single molecule magnet (SMM). The magnetic hyperfine field of [Dy(Cy₃PO)₂(H₂O)₅] Br₃·2(Cy₃PO)·2H₂O ·2EtOH is with B₀=582.3(5) T significantly larger than the one of the free-ion DyIII with a ⁶H15/2 ground state. We attribute this difference to the influence of the coordinating ligands on the Fermi-contact interaction between the s and 4f electrons of the DyIII ion...
December 12, 2018: Angewandte Chemie
Flavio S Nogueira, Zohar Nussinov, Jeroen van den Brink
Recently, two fundamental topological properties of a magnetic vortex at the interface of a superconductor (SC) and a strong topological insulator (TI) have been established: The vortex carries both a Majorana zero mode relevant for topological quantum computation and, for a time-reversal invariant TI, a charge of e/4. This fractional charge is caused by the axion term in the electromagnetic Lagrangian of the TI. Here we determine the angular momentum J of the vortices, which in turn determines their mutual statistics...
November 30, 2018: Physical Review Letters
Soichiro Akagi, Taishiro Horiguchi, Sho Fujii, Noboru Kitamura
We report the emission properties of the octahedral hexamolybdenum(II) bromide-core ({Mo6 Br8 }4+ ) clusters having a series of terminal aromatic carboxylate ligands (RCOO), [{Mo6 Br8 }(RCOO)6 ]2- , in solution and crystalline phases. The acid dissociation constant of RCOOH (p Ka (L)) was shown to govern the redox and emission properties of the clusters. Temperature ( T)-controlled emission experiments (3-300 K) demonstrated that the clusters showed large T-dependent emission energies (ν̃em ) and lifetimes (τem ) because of zero-magnetic-field splitting in the emissive excited triplet (T1 ) states...
December 14, 2018: Inorganic Chemistry
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