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Magnetic Water

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https://www.readbyqxmd.com/read/30341911/microstructure-changes-in-radiochromic-films-due-to-magnetic-field-and-radiation
#1
Olga Volotskova, Xuiqi Fang, Michael Keidar, Hersh Chandarana, Indra J Das
PURPOSE: To correlate the dose response and changes in microscopic structures of the radiochromic films exposed to the clinical magnetic field in the range 1.5-3T with standard and flattening filter-free (FFF) photon beams. METHODS: The radiochromic film was cut into 5x5cm2 sheets/samples from one batch. These samples were exposed to a 1.5 Tesla (T) and/or 3T B-field from an MRI scanner using an abdominal sequence for 7 min before and after irradiation with 6 MV and/or 6 MV FFF beams...
October 20, 2018: Medical Physics
https://www.readbyqxmd.com/read/30340668/magnetic-micro-particle-conditioning-pressurized-vertical-electro-osmotic-dewatering-mpeod-of-activated-sludge-role-and-behavior-of-moisture-and-organics
#2
Xinxin Guo, Xu Qian, Yili Wang, Huaili Zheng
In this study, a magnetic micro-particle conditioning-pressurized vertical electro-osmotic dewatering (MPEOD) process with magnetic micro-particle conditioning-drainage under gravity-mechanical compression-electrical compression (MMPC-DG-MC-EC) stages was established to study the distribution and migration of water, extracellular polymeric substances (EPS), and other organic matter in the activated sludge (AS) matrix at each stage. Results showed that the MPEOD process could attain 53.52% water content (WC) in dewatered AS with bound water (BW) and free water (FW) reduction rates of 82...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340309/landfill-leachate-treatment-by-sorption-in-magnetic-particles-preliminary-study
#3
Paulo A Augusto, Teresa Castelo-Grande, Leticia Merchan, Angel M Estevez, Xavier Quintero, Domingos Barbosa
Leachates are still an open issue in environmental protection. Many of the applied methods for their treatment present low efficiency and thus need to be used collectively. In practice reverse osmosis is mostly used, as it is the most effective option, regardless of its cost. Magnetic methods to treat effluents have been used for water and wastewater treatment by the use of magnetic particles together with magnetic separation for the removal of contaminants. However, large-scale applications are few or even non-existent when we deal with complex contaminated media such as landfill leachates, for which not even research studies at laboratorial scale with real samples have been done yet...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30338994/dehydration-triggered-charge-transfer-and-high-proton-conductivity-in-h-3-o-ni-iii-cyclam-m-ii-cn-6-m-ru-os-cyanide-bridged-chains
#4
Mateusz Reczyński, Beata Nowicka, Christian Näther, Marcin Kozieł, Koji Nakabayashi, Shin-Ichi Ohkoshi, Barbara Sieklucka
The coexistence of dehydration-driven charge transfer, magnetic interactions, and high proton conductivity was found in two bimetallic alternating CN-bridged chains {(H3 O)[NiIII (cyclam)][MII (CN)6 ]·5H2 O} n (M = Ru (1), Os (2); cyclam = 1,4,8,11-tetraazacyclotetradecane). Dehydration of these materials causes structural transformation and triggers charge transfer between the metal centers: NiIII -NC-MII → NiII -NC-MIII . The CT process, whose extent is tuned by the change of the anionic building block, causes significant increase of magnetic moment, appearance of antiferromagnetic interactions, and noticeable changes in color...
October 19, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30338326/exceptionally-slow-magnetic-relaxation-in-cobalt-ii-benzoate-trihydrate
#5
Anna Vráblová, Juraj Černák, Cyril Rajnák, Ľubor Dlháň, Milagros Tomás, Larry R Falvello, Roman Boča
Cobalt(ii) benzoate trihydrate prepared by the reaction of CoCO3 with benzoic acid (HBz) in boiling water followed by crystallization has been structurally characterized as a chain-like system with the formula unit [Co(Bz)(H2O)2]Bz·H2O where the Co(ii) atoms are triply linked by one bridging syn-syn benzoato (Bz) and two aqua ligands; additional benzoate counter ions and solvate water molecules are present in the crystal structure. DC magnetic measurements reveal a sizable exchange coupling of a ferromagnetic nature between the Co(ii) atoms...
October 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30338123/ph-responsive-superstructures-prepared-via-the-assembly-of-fe-3-o-4-amphipathic-janus-nanoparticles
#6
Shuang Cai, Bin Luo, Xiaohui Zhan, Xiaoxi Zhou, Fang Lan, Qiangying Yi, Yao Wu
The strategy of using Fe3 O4 amphiphilic Janus nanoparticles (Fe3 O4 @AJNPs) bearing β-cyclodextrin (β-CD) and aminopyridine (APD) functionalized polymethyl methacrylate (PGMA) to construct pH-stimuli responsive co-assemblies through host-guest interactions between β-CD and APD was proposed. The spherical co-assemblies with an average diameter about 210 nm were excellent magnetic responsive and quite stable even up to 2 months in deionized water. The pH-liable capability of these co-assemblies was revealed by disassembly of the formed superstructures with destruction of the built inclusion complexes...
October 2018: Regenerative Biomaterials
https://www.readbyqxmd.com/read/30337027/the-comparison-of-ultrasound-assisted-immersion-freezing-air-freezing-and-immersion-freezing-on-the-muscle-quality-and-physicochemical-properties-of-common-carp-cyprinus-carpio-during-freezing-storage
#7
Qinxiu Sun, Fangda Sun, Xiufang Xia, Honghua Xu, Baohua Kong
This study investigated the impact of ultrasound-assisted immersion freezing (UIF), air freezing (AF), and immersion freezing (IF) on the ice crystal size, protein thermal stability, and physicochemical properties of common carp (Cyprinus carpio) muscle during frozen storage. UIF samples had smaller ice crystals throughout the storage period than AF and IF samples did, which led to less damage to the muscle tissue. Low-field nuclear magnetic resonance analysis revealed that UIF reduced the mobility and loss of immobilized and free water...
October 6, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30337010/a-straightforward-multiparametric-quality-control-protocol-for-proton-magnetic-resonance-spectroscopy-validation-and-comparison-of-various-1-5-t-and-3-t-clinical-scanner-systems
#8
Roberto Sghedoni, Angela Coniglio, Lorenzo Nicola Mazzoni, Simone Busoni, Giacomo Belli, Roberto Tarducci, Luca Nocetti, Luca Fedeli, Marco Esposito, Antonio Ciccarone, Luisa Altabella, Alessandro Bellini, Luca Binotto, Rocchina Caivano, Marco Carnì, Alessandra Ricci, Sara Cimolai, Davide D'Urso, Chiara Gasperi, Fabrizio Levrero, Paola Mangili, Sabrina Morzenti, Andrea Nitrosi, Nadia Oberhofer, Nicoletta Parruccini, Alessandra Toncelli, Lucia Maria Valastro, Cesare Gori, Gianni Gobbi, Marco Giannelli
PURPOSE: The aim of this study was to propose and validate across various clinical scanner systems a straightforward multiparametric quality assurance procedure for proton magnetic resonance spectroscopy (MRS). METHODS: Eighteen clinical 1.5 T and 3 T scanner systems for MRS, from 16 centres and 3 different manufacturers, were enrolled in the study. A standard spherical water phantom was employed by all centres. The acquisition protocol included 3 sets of single (isotropic) voxel (size 20 mm) PRESS acquisitions with unsuppressed water signal and acquisition voxel position at isocenter as well as off-center, repeated 4/5 times within approximately 2 months...
October 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/30336630/combined-system-of-magnetic-resonance-sounding-and-time-domain-electromagnetic-method-for-water-induced-disaster-detection-in-tunnels
#9
Xinlei Shang, Chuandong Jiang, Zhongjun Ma, Shengwu Qin
Underground construction projects such as tunnel construction are at high risk of water-induced disasters. Because this type of disaster poses a serious threat to worker safety and productivity, instruments and methods that can accurately detect the water source are critical. In this study, a water detection instrument that combines Magnetic Resonance Sounding (MRS) and Time-domain Electromagnetic Method (TEM) techniques to yield a joint MRS-TEM interpretation method was developed for narrow underground spaces such as tunnels...
October 17, 2018: Sensors
https://www.readbyqxmd.com/read/30336395/magnetic-cross-linked-enzyme-aggregates-of-acrylamidase-from-cupriavidus-oxalaticus-ictdb921-for-biodegradation-of-acrylamide-from-industrial-waste-water
#10
Dattatray K Bedade, Abhijeet B Muley, Rekha S Singhal
Acrylamidase from Cupriavidus oxalaticus ICTDB921 was immobilized on magnetic nanoparticles (MNPs) for degradation of acrylamide (a group 2A carcinogen and an environmental contaminant) from industrial waste water. Acrylamidase-MNPs were prepared (maximum recovery ∼94%) at optimized process parameters viz. 1.5:1 (v/v) of acetone: crude acrylamidase/5 mM of glutaraldehyde/90 min/1.5:1 of enzyme: MNP ratio. MNPs and acrylamidase-MNPs were characterized by particle size analysis, FTIR, XRD, SEM and vibrating sample magnetometer...
October 6, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/30336200/investigating-mobility-of-crude-oil-adsorbates-on-mineral-surfaces-by-nmr
#11
Henrik N Sørgård, Christian Totland, Willy Nerdal, John Georg Seland
We have applied diffusion and relaxation Nuclear Magnetic Resonance experiments to investigate the translational and rotational mobility of adsorbents on quartz and calcite mineral surfaces. On both surfaces it was found that water is the dominant molecule. On the quartz surface the majority of water molecules have a relatively high degree of both rotational and translational mobility, while a minor fraction of water molecules, and all hydrocarbon molecules, have a significantly lower mobility. On the calcite surface the translational mobility is very low for all the adsorbed molecules, while there is a large diversity in rotational mobility, indicating that the hydrocarbon molecules are strongly attached to the surface, but that some part of each molecule still have a large degree of rotational mobility...
October 15, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/30336040/evidence-of-o-o-bond-formation-in-the-final-metastable-s-3-state-of-nature-s-water-oxidizing-complex-implying-a-novel-mechanism-of-water-oxidation
#12
Thomas A Corry, Patrick J O'Malley
A novel mechanism for the final stages of Nature's photosynthetic water oxidation to molecular oxygen is proposed. This is based on a comparison of experimental and broken symmetry density functional theory (BS-DFT) calculated geometries and magnetic resonance properties of water oxidizing complex models in the final metastable oxidation state, S3 . We show that peroxo models of the S3 state are in vastly superior agreement with the current experimental structural determinations compared with oxo-hydroxo models...
October 18, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/30335984/resonance-raman-epr-and-mcd-spectroscopic-investigation-of-diheme-cytochrome-c-peroxidases-from-nitrosomonas-europaea-and-shewanella-oneidensis
#13
Matthew W Wolf, Kimberly Rizzolo, Sean J Elliott, Nicolai Lehnert
Cytochrome c peroxidases (bCcPs) are diheme enzymes required for the reduction of H2O2 to water in bacteria. There are two classes of bCcPs: one class of enzymes is active in the diferric form (constitutively active), and the other class of enzymes requires the reduction of the high-potential heme (H-heme) before catalysis commences (reductively activated) at the lowpotential heme (L-heme). In order to better understand the mechanisms and heme electronic structures of these different bCcPs, a constitutively active bCcP from Nitrosomonas europaea (NeCcP) and a reductively activated bCcP from Shewanella oneidensis (SoCcP) were characterized in both the diferric and semi-reduced states by electron paramagnetic resonance (EPR), resonance Raman (rRaman), and magnetic circular dichroism (MCD) spectroscopy...
October 17, 2018: Biochemistry
https://www.readbyqxmd.com/read/30335473/abdominal-organ-perfusion-and-inflammation-in-experimental-sepsis-a-magnetic-resonance-imaging-study
#14
Silvia Marchesi, Fracisco Ortiz Nieto, Kerstin Magdalena Ahlgren, Agneta Roneus, Ricardo Feinstein, Miklos Lipcsey, Anders Larsson, Håkan Ahlström, Goran Hedenstierna
Diffusion-weighted magnetic resonance imaging (DW-MRI) uses water as contrast and enables the study of perfusion in many organs simultaneously in situ. We used DW-MRI in a sepsis model, comparing abdominal organs perfusion with global hemodynamic measurements and inflammation. Sixteen anesthetized piglets were randomized into 3 groups: HighMAP (mean arterial pressure, MAP > 65 mmHg), LowMAP (MAP between 50 and 60 mmHg) and Healthy Controls (HC). Sepsis was obtained with endotoxin and the desired MAP maintained with noradrenaline...
October 18, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/30334295/ratiometric-noe-1-6-contrast-in-brain-tumors
#15
Zhongliang Zu
Recently, a new nuclear Overhauser enhancement (NOE)-mediated saturation transfer effect at around -1.6 ppm from water, termed NOE(-1.6), was reported to show hypointense signals in brain tumors. Similar to chemical exchange saturation transfer or magnetization transfer (MT) effects, which depend on the solute pool concentration, the exchange/coupling rate, the solute transverse relaxation rate, etc., the NOE(-1.6) effect should also depend on these factors. Since the exchange rate is relevant to tissue pH, and the coupling rate and the solute transverse relaxation rate are relevant to the motional property of the coupled molecules, further studies to quantify the contribution from only the exchange/coupling rate and the solute transverse relaxation rate are always interesting...
October 18, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/30333785/changes-in-posttraumatic-brain-edema-in-craniectomy-selective-brain-hypothermia-model-are-associated-with-modulation-of-aquaporin-4-level
#16
Jacek Szczygielski, Cosmin Glameanu, Andreas Müller, Markus Klotz, Christoph Sippl, Vanessa Hubertus, Karl-Herbert Schäfer, Angelika E Mautes, Karsten Schwerdtfeger, Joachim Oertel
Both hypothermia and decompressive craniectomy have been considered as a treatment for traumatic brain injury. In previous experiments we established a murine model of decompressive craniectomy and we presented attenuated edema formation due to focal brain cooling. Since edema development is regulated via function of water channel proteins, our hypothesis was that the effects of decompressive craniectomy and of hypothermia are associated with a change in aquaporin-4 (AQP4) concentration. Male CD-1 mice were assigned into following groups ( n = 5): sham, decompressive craniectomy, trauma, trauma followed by decompressive craniectomy and trauma + decompressive craniectomy followed by focal hypothermia...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/30332822/simultaneous-separation-and-purification-of-five-polymethoxylated-flavones-from-dahongpao-tangerine-citrus-tangerina-tanaka-using-macroporous-adsorptive-resins-combined-with-prep-hplc
#17
Zhenqing Li, Ziyan Zhao, Zhiqin Zhou
In this study, a preparative separation method was established to simultaneously isolate the polymethoxylated flavones (PMFs) from the peel of "Dahongpao" tangerine using macroporous adsorptive resins (MARs) combined with prep-HPLC. The total PMFs were enriched using MARs to remove most sugars, water-soluble pigments, and flavanones, and the eluents obtained were analyzed by ultra-performance liquid chromatography (UPLC) to determine the PMF composition. The separation and purification of PMFs were carried out by using a mass spectrometry-guided prep-HPLC with a gradient elution of acetonitrile-water ( v / v ), simultaneously...
October 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30325370/a-triazine-based-conjugated-microporous-polymer-composite-for-magnetic-solid-phase-extraction-of-5-nitroimidazoles-coupled-with-uplc-ms-ms-for-quantification
#18
Wei Yang, Xia Wu, Tingting Liu, Ting Wang, Xiaohong Hou
An attractive triazine-based conjugated microporous polymer (TCMP) was fabricated via the Friedel-Crafts reaction and magnetized by a simple reduction co-precipitation method for the first time. The morphology and textural properties of the as-synthesized materials were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, N2 adsorption measurements, elemental analysis, and magnetic measurements. The resulting magnetic triazine-based conjugated microporous polymer (MTCMP) was introduced as an efficient adsorbent for vortex-assisted magnetic solid phase extraction (MSPE) coupled with ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) for the determination of trace 5-nitroimidazoles (5-NDZs) in environmental water samples...
October 16, 2018: Analyst
https://www.readbyqxmd.com/read/30323789/associations-between-lumbar-vertebral-bone-marrow-and-paraspinal-muscle-fat-compositions-an-investigation-by-chemical-shift-encoding-based-water-fat-mri
#19
Nico Sollmann, Michael Dieckmeyer, Sarah Schlaeger, Alexander Rohrmeier, Jan Syvaeri, Maximilian N Diefenbach, Dominik Weidlich, Stefan Ruschke, Elisabeth Klupp, Daniela Franz, Ernst J Rummeny, Claus Zimmer, Jan S Kirschke, Dimitrios C Karampinos, Thomas Baum
Purpose: Advanced magnetic resonance imaging (MRI) methods enable non-invasive quantification of body fat situated in different compartments. At the level of the lumbar spine, the paraspinal musculature is the compartment spatially and functionally closely related to the vertebral column, and both vertebral bone marrow fat (BMF) and paraspinal musculature fat contents have independently shown to be altered in various metabolic and degenerative diseases. However, despite their close relationships, potential correlations between fat compositions of these compartments remain largely unclear...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/30322014/amphiphilic-polymeric-micelles-based-on-deoxycholic-acid-and-folic-acid-modified-chitosan-for-the-delivery-of-paclitaxel
#20
Liang Li, Na Liang, Danfeng Wang, Pengfei Yan, Yoshiaki Kawashima, Fude Cui, Shaoping Sun
The present investigation aimed to develop a tumor-targeting drug delivery system for paclitaxel (PTX). The hydrophobic deoxycholic acid (DA) and active targeting ligand folic acid (FA) were used to modify water-soluble chitosan (CS). As an amphiphilic polymer, the conjugate FA-CS-DA was synthesized and characterized by Proton nuclear magnetic resonance (¹H-NMR) and Fourier-transform infrared spectroscopy (FTIR) analysis. The degree of substitutions of DA and FA were calculated as 15.8% and 8.0%, respectively...
October 12, 2018: International Journal of Molecular Sciences
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