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Magnetization transfer

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https://www.readbyqxmd.com/read/28231553/a-reusable-aptasensor-of-thrombin-based-on-dna-machine-employing-resonance-light-scattering-technique
#1
Yining Hou, Jifeng Liu, Min Hong, Xia Li, Yanhua Ma, Qiaoli Yue, Chen-Zhong Li
The design of molecular nanodevices attracted great interest in these years. Herein, a reusable, sensitive and specific aptasensor was constructed based on an extension-contraction movement of DNA interconversion for the application of human thrombin detection. The present biosensor was based on resonance light scattering (RLS) using magnetic nanoparticles (MNPs) as the RLS probe. MNPs coated with streptavidin can combine with biotin labeled thrombin aptamers. The combined nanoparticles composite is monodispersed in aqueous medium...
February 20, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28230054/magnetization-switching-in-ferromagnets-by-adsorbed-chiral-molecules-without-current-or-external-magnetic-field
#2
Oren Ben Dor, Shira Yochelis, Anna Radko, Kiran Vankayala, Eyal Capua, Amir Capua, See-Hun Yang, Lech Tomasz Baczewski, Stuart Stephen Papworth Parkin, Ron Naaman, Yossi Paltiel
Ferromagnets are commonly magnetized by either external magnetic fields or spin polarized currents. The manipulation of magnetization by spin-current occurs through the spin-transfer-torque effect, which is applied, for example, in modern magnetoresistive random access memory. However, the current density required for the spin-transfer torque is of the order of 1 × 10(6) A·cm(-2), or about 1 × 10(25) electrons s(-1) cm(-2). This relatively high current density significantly affects the devices' structure and performance...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28229840/-magnetic-resonance-imaging-conversion-predictors-of-clinically-isolated-syndrome-to-multiple-sclerosis
#3
REVIEW
Sara Peixoto, Pedro Abreu
INTRODUCTION: Clinically isolated syndrome may be the first manifestation of multiple sclerosis, a chronic demyelinating disease of the central nervous system, and it is defined by a single clinical episode suggestive of demyelination. However, patients with this syndrome, even with long term follow up, may not develop new symptoms or demyelinating lesions that fulfils multiple sclerosis diagnostic criteria. We reviewed, in clinically isolated syndrome, what are the best magnetic resonance imaging findings that may predict its conversion to multiple sclerosis...
November 2016: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28228011/spectroscopic-definition-of-the-cuz-o-intermediate-in-turnover-of-nitrous-oxide-reductase-and-molecular-insight-into-the-catalytic-mechanism
#4
Esther M Johnston, Cíntia Carreira, Simone Dell'Acqua, Somdatta Ghosh Dey, Sofia R Pauleta, Isabel Moura, Edward I Solomon
Spectroscopic methods and density functional theory (DFT) calculations are used to determine the geometric and electronic structure of CuZ(o), an intermediate form of the Cu4S active site of nitrous oxide reductase (N2OR) that is observed in single turnover of fully reduced N2OR with N2O. Electron paramagnetic resonance (EPR), absorption, and magnetic circular dichroism (MCD) spectroscopies show that CuZ(o) is a 1-hole (i.e. 3Cu(I)Cu(II)) state with spin density delocalized evenly over CuI and CuIV. Resonance Raman spectroscopy shows two Cu-S vibrations at 425 and 413 cm(-1), the latter with a -3 cm(-1) O(18) solvent isotope shift...
February 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28226699/estimating-multimodal-brain-connectivity-in-multiple-sclerosis-an-exploratory-factor-analysis
#5
Matteo Mancini, Giovanni Giulietti, Barbara Spano, Marco Bozzali, Mara Cercignani, Silvia Conforto, Matteo Mancini, Giovanni Giulietti, Barbara Spano, Marco Bozzali, Mara Cercignani, Silvia Conforto, Giovanni Giulietti, Mara Cercignani, Silvia Conforto, Matteo Mancini, Barbara Spano, Marco Bozzali
Graph-theoretical approaches have become a popular way to model brain data collected using magnetic resonance imaging (MRI), both from the structural and the functional perspectives. In structural networks, tract-based mapping allows to model different aspects of brain structures by means of the specific characteristics of the different MRI modalities. However, there has been little effort to join the information carried by each modality and to understand what level of common variance is shown in these data...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225126/carborane-layered-double-hydroxide-nanohybrids-for-potential-targeted-and-magnetically-targeted-bnct-applications
#6
Ahmet Nedim Ay, Hande Akar, Adnana Zaulet, Clara Viňas, Francesc Teixidor, Birgul Zumreoglu-Karan
Carborane-intercalated layered double hydroxide nanohybrids (CB-LDH) and a magnesium ferrite (MF) supported-CB-LDH core-shell nanocomposite (CB-LDH@MF) are reported. The preparation of nanohybrids were carried out by exchanging the interlayer nitrate groups of Mg-Al-NO3-LDH with monothiol-o-carborane (SCB), 1-methyl-2-carboxyl-o-carborane (MeCB), 1-phenyl-2-carboxyl-o-carborane (PhCB) and 1,12-dicarboxyl-p-carborane (COOHCB) molecules. A magnetic core-shell nanocomposite was further prepared by supporting the COOHCB-LDH nanohybrid on MF nanoparticles...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28225123/switchable-3-0-magnetoelectric-nanocomposite-thin-film-with-high-coupling
#7
Austin McDannald, Linghan Ye, Claudia Cantoni, Sreenivasulu Gollapudi, Gopalan Srinivasan, Bryan D Huey, Menka Jain
A mixed precursor solution method was used to deposit 3-0 nanocomposite thin films of PbZr0.52Ti0.48O3 (PZT) and CoFe2O4 (CFO). The piezoelectric behavior of PZT and magnetostrictive behavior of CFO allow for magnetoelectric (ME) coupling through strain transfer between the respective phases. High ME coupling is desired for many applications including memory devices, magnetic field sensors, and energy harvesters. The spontaneous phase separation in the 3-0 nanocomposite film was observed, with 25 nm CFO particle or nanophases distributed in discrete layers through the thickness of the PZT matrix...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28225082/environmentally-friendly-chitosan-pei-grafted-magnetic-gelatin-for-the-highly-effective-removal-of-heavy-metals-from-drinking-water
#8
Bingbing Li, Feng Zhou, Kai Huang, Yipei Wang, Surong Mei, Yikai Zhou, Tao Jing
The development of environmentally friendly sorbents with a high adsorption capacity is an essential problem in the removal of heavy metals from drinking water. In this study, magnetic gelatin was prepared using transglutaminase as a cross-linker, which could only catalyze an acyl-transfer reaction between lysine and glutamine residues of the gelatin and not affect other amino groups. Therefore, it was beneficial for the further modification based on the amino groups, and did not affect the spatial structure of gelatin, which can effectively prevent the embedding of active sites in the polymer matrix...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224152/charge-transfer-complexes-of-metal-free-phthalocyanine-radical-anions-with-decamethylmetallocenium-cations-cp-2co-h2pc%C3%AB-%C3%A2-solvent-and-cp-2cr-h2pc%C3%AB-%C3%A2-4c6h4cl2
#9
Dmitri V Konarev, Salavat S Khasanov, Manabu Ishikawa, Akihiro Otsuka, Hideki Yamochi, Gunzi Saito, Rimma N Lyubovskaya
Charge transfer complexes (Cp*2Co(+))(H2Pc˙(-))·0.5C6H4Cl2·0.7C6H5CN·0.3C6H14 (1) and (Cp*2Cr(+))(H2Pc˙(-))·4C6H4Cl2 (2) have been obtained as single crystals. Both complexes contain metal-free phthalocyanine (Pc) radical anions and decamethylmetallocenium cations. Reduction of the Pc macrocycle leads to the appearance of new bands at 1026-1030 nm in the NIR range and blue shifts of both Soret and Q-bands of H2Pc in the spectra of 1 and 2. The geometry of the Pc macrocycles supports the formation of H2Pc˙(-) by the alternation of shorter and longer C-N(imine) bonds in the macrocycles in 2...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28223154/idiopathic-and-systemic-sclerosis-associated-pulmonary-arterial-hypertension-a-comparison-of-demographic-haemodynamic-and-magnetic-resonance-imaging-characteristics-and-outcomes
#10
Sheila Ramjug, Nehal Hussain, Judith Hurdman, Catherine Billings, Athanasios Charampopoulos, Charlie A Elliot, David G Kiely, Ian Sabroe, Smitha Rajaram, Andrew J Swift, Robin Condliffe
BACKGROUND: Previous studies have identified survival in systemic sclerosis (SSc)-associated pulmonary arterial hypertension (SSc-PAH) to be worse than in idiopathic pulmonary arterial hypertension (IPAH). We investigated differences between these conditions by comparing demographic, haemodynamic and radiological characteristics and outcomes in a large cohort of incident patients. METHODS: 651 patients diagnosed with IPAH or SSc-associated pre-capillary pulmonary hypertension were included...
February 18, 2017: Chest
https://www.readbyqxmd.com/read/28222243/studies-on-the-binding-of-modest-modulators-of-the-human-enzyme-sirtuin-6-using-std-nmr
#11
Beatriz E Bolívar, John T Welch
Pyrazinamide (PZA), an essential constituent of short course tuberculosis chemotherapy, binds weakly but selectively to Sirtuin 6 (SIRT6). Despite structural similarities between nicotinamide (NAM), PZA, and pyrazinoic acid (POA), these inhibitors modulate SIRT6 via different mechanisms and binding sites, as suggested by Saturation Transfer Difference (STD) Nuclear Magnetic Resonance (NMR). Available experimental evidence, such as that derived from crystal structures and kinetic experiments, is of only limited utility in the elucidation of the mechanistic details of sirtuin inhibition by NAM or other inhibitors...
February 21, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28222160/soret-and-dufour-effects-on-mhd-peristaltic-transport-of-jeffrey-fluid-in-a-curved-channel-with-convective-boundary-conditions
#12
Tasawar Hayat, Hina Zahir, Anum Tanveer, Ahmad Alsaedi
The purpose of present article is to examine the peristaltic flow of Jeffrey fluid in a curved channel. An electrically conducting fluid in the presence of radial applied magnetic field is considered. Analysis of heat and mass transfer is carried out. More generalized realistic constraints namely the convective conditions are utilized. Soret and Dufour effects are retained. Problems formulation is given for long wavelength and low Reynolds number assumptions. The expressions of velocity, temperature, heat transfer coefficient, concentration and stream function are computed...
2017: PloS One
https://www.readbyqxmd.com/read/28221161/morphology-directed-self-assembly-and-pattern-transfer-from-a-high-molecular-weight-polystyrene-block-poly-dimethylsiloxane-block-copolymer-film
#13
Li-Chen Cheng, Wubin Bai, Eduardo Martin, Kun-Hua Tu, Konstantinos Ntetsikas, George Liontos, Apostolos Avgeropoulos, Caroline Ross
The self-assembly of block copolymers with large feature sizes is inherently challenging as the large kinetic barrier arising from chain entanglement of high molecular weight polymers limits the extent over which long-range ordered microdomains can be achieved. Here, we illustrate the evolution of thin film morphology from a diblock copolymer of polystyrene-block-poly(dimethylsiloxane) exhibiting total number average molecular weight of 123 kg/mol, and demonstrate the formation of layers of well-ordered cylindrical microdomains under appropriate conditions of binary solvent mix ratio, commensurate film thickness, and solvent vapor annealing time...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28219721/magnetic-nanoparticles-a-multifunctional-vehicle-for-modern-theranostics
#14
REVIEW
M Angelakeris
Magnetic nanoparticles provide a unique multifunctional vehicle for modern theranostics since they can be remotely and non-invasively employed as imaging probes, carrier vectors and smart actuators. Additionally, special delivery schemes beyond the typical drug delivery such as heat or mechanical stress may be magnetically triggered to promote certain cellular pathways. To start with, we need magnetic nanoparticles with several well-defined and reproducible structural, physical, and chemical features, while bio-magnetic nanoparticle design imposes several additional constraints...
February 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28218831/new-possibilities-for-magnetic-control-of-chemical-and-biochemical-reactions
#15
Anatoly Buchachenko, Ronald G Lawler
Chemistry is controlled by Coulomb energy; magnetic energy is lower by many orders of magnitude and may be confidently ignored in the energy balance of chemical reactions. The situation becomes less clear, however, when reaction rates are considered. In this case, magnetic perturbations of nearly degenerate energy surface crossings may produce observable, and sometimes even dramatic, effects on reactions rates, product yields, and spectroscopic transitions. A case in point that has been studied for nearly five decades is electron spin-selective chemistry via the intermediacy of radical pairs...
February 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28214465/acute-and-chronic-lateral-ankle-instability-diagnosis-management-and-new-concepts
#16
Rachel Shakked, Steven Sheskier
Lateral ankle instability is a common entity that can result in degenerative arthritis if left untreated. Acute ligament injuries should primarily be treated nonoperatively with a course of physical therapy and functional bracing. Chronic ankle instability is defined as mechanical or functional and can be diagnosed using a combination of history, physical examination, stress radiographs, and magnetic resonance imaging. After failure of nonoperative treatment, surgical treatment with anatomic ligament repair and inferior extensor retinaculum augmentation has the best clinical outcomes...
January 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28212272/design-of-novel-fbg-based-sensor-of-differential-pressure-with-magnetic-transfer
#17
Guohui Lyu, Guohang Che, Junqing Li, Xu Jiang, Keda Wang, Yueqiang Han, Laixu Gao
In this paper, a differential pressure sensor with magnetic transfer is proposed, in which the non-electric measurement based on the fiber Bragg grating (FBG) with the position limiting mechanism is implemented without the direct contact of the sensing unit with the measuring fluid. The test shows that the designed sensor is effective for measuring differential pressure in the range of 0~10 kPa with a sensitivity of 0.0112 nm/kPa, which can be used in environments with high temperature, strong corrosion and high overload measurements...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28211703/collisional-scaling-of-the-energy-transfer-in-drift-wave-zonal-flow-turbulence
#18
B Schmid, P Manz, M Ramisch, U Stroth
The collisionality scaling of density and potential coupling together with zonal flow energy transfer and spectral power is investigated at the stellarator experiment TJ-K. With a poloidal probe array, consisting of 128 Langmuir probes, density and potential fluctuations are measured on four neighboring flux surfaces simultaneously over the complete poloidal circumference. By analyzing Reynolds stress and pseudo-Reynolds stress, it is found that, for increasing collisionality, the coupling between density and potential decreases which hinders the zonal flow drive...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28210984/effect-of-solution-ionic-strength-on-the-pka-of-the-nitroxide-ph-epr-probe-2-2-3-4-5-5-hexamethylimidazolidin-1-oxyl
#19
Kaleigh Margita, Maxim A Voinov, Alex I Smirnov
Spin probe and spin labeling Electron Paramagnetic Resonance methods are indispensable research tools for solving a wide range of bioanalytical problems-from measuring microviscosity and polarity of phase-separated liquids to oxygen concentrations in tissues. One of the emerging uses of spin probes are the studies of proton transfer-related and surface electrostatic phenomena. The latter Electron Paramagnetic Resonance methods rely on molecular probes containing an additional functionality capable of reversible ionization (protonation, in particular) in the immediate proximity to an Electron Paramagnetic Resonance-active reporter group, such as (N-O(•)) for nitroxides...
February 17, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28209976/voltage-induced-magnetization-dynamics-in-cofeb-mgo-cofeb-magnetic-tunnel-junctions
#20
Katsuya Miura, Shin Yabuuchi, Masaki Yamada, Masahiko Ichimura, Bivas Rana, Susumu Ogawa, Hiromasa Takahashi, Yasuhiro Fukuma, Yoshichika Otani
Recent progress in magnetic tunnel junctions (MTJs) with a perpendicular easy axis consisting of CoFeB and MgO stacking structures has shown that magnetization dynamics are induced due to voltage-controlled magnetic anisotropy (VCMA), which will potentially lead to future low-power-consumption information technology. For manipulating magnetizations in MTJs by applying voltage, it is necessary to understand the coupled magnetization motion of two magnetic (recording and reference) layers. In this report, we focus on the magnetization motion of two magnetic layers in MTJs consisting of top layers with an in-plane easy axis and bottom layers with a perpendicular easy axis, both having perpendicular magnetic anisotropy...
February 17, 2017: Scientific Reports
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