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https://www.readbyqxmd.com/read/28454478/enhanced-mri-t-2-relaxivity-in-contrast-probed-anchor-free-pegylated-iron-oxide-nanoparticles
#1
Bibek Thapa, Daysi Diaz-Diestra, Juan Beltran-Huarac, Brad R Weiner, Gerardo Morell
Superparamagnetic iron oxide nanoparticles (SPIONs, ~11-nm cores) were PEGylated without anchoring groups and studied as efficient MRI T 2 contrast agents (CAs). The ether group of PEG is efficiently and directly linked to the positively charged surface of SPIONs, and mediated through a dipole-cation covalent interaction. Anchor-free PEG-SPIONs exhibit a spin-spin relaxivity of 123 ± 6 mM(-1)s(-1), which is higher than those of PEG-SPIONs anchored with intermediate biomolecules, iron oxide nanoworms, or Feridex...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454158/adding-a-spin-to-kerker-s-condition-angular-tuning-of-directional-scattering-with-designed-excitation
#2
Lei Wei, Nandini Bhattacharya, H Paul Urbach
We describe a method to control the directional scattering of a high-index dielectric nanosphere, which utilizes the unique focusing properties of an azimuthally polarized phase vortex and a radially polarized beam to independently excite inside the nanosphere a spinning magnetic dipole and a linearly polarized electric dipole mode normal to the magnetic dipole. We show that by simply adjusting the phase and amplitude of the field on the exit pupil of the optical system, the scattering of the nanosphere can be tuned to any direction within a plane, and the method works over a broad wavelength range...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454013/mri-related-magnetic-field-exposures-and-risk-of-commuting-accidents-a-cross-sectional-survey-among-dutch-imaging-technicians
#3
Anke Huss, Kristel Schaap, Hans Kromhout
BACKGROUND: Imaging technicians working with magnetic resonance imaging (MRI) may experience acute effects such as vertigo or dizziness when being exposed. A previous study also reported an increased risk of accidents in MRI exposed staff. OBJECTIVES: We aimed at evaluating commuting accident risk in Dutch imaging technicians. METHODS: Of invited imaging technicians, 490 (29%) filled in a questionnaire pertaining to (near) accidents when driving or riding a bike, health, lifestyle and work practices...
April 25, 2017: Environmental Research
https://www.readbyqxmd.com/read/28453873/induced-orientation-of-nitrogen-monoxide-and-azide-ion-vibrations-in-human-hemoglobin-in-bidistilled-water-solution-under-a-static-magnetic-field
#4
Emanuele Calabrò, Salvatore Magazù
In this study, we report the effects of static magnetic fields (SMFs) at 200 mT on different hemoglobin aqueous solutions, in the absence and in the presence of sucrose and trehalose, studied by FTIR spectroscopic techniques. Significant decrease in intensity of Amide I and Amide II vibration bands was observed after 6 h exposure for hemoglobin in bidistilled water solution. Also, it was observed that the decrease in intensity of the Amide I band was larger than the Amide II after exposure. This result can be explained assuming that an SMF induces increase of hydrogen bonding in hemoglobin in bidistilled water solution...
April 28, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28453309/combination-of-cyclodextrin-and-ionic-liquid-in-analytical-chemistry-current-and-future-perspectives
#5
Y H Boon, M Raoov, N N M Zain, S Mohamad, H Osman
The growth in driving force and popularity of cyclodextrin (CDs) and ionic liquids (ILs) as promising materials in the field of analytical chemistry has resulted in an exponentially increase of their exploitation and production in analytical chemistry field. Cyclodextrins belong to the family of cyclic oligosaccharides composing of α-(1,4) linked glucopyranose subunits and possess a cage-like supramolecular structure. This structure enables chemical reactions to proceed between interacting ions, radical or molecules in the absence of covalent bonds...
April 28, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28453281/designing-ligands-to-isolate-znln-and-zn2ln-complexes-field-induced-single-ion-magnet-behavior-of-the-zndy-zn2dy-and-zn2er-analogues
#6
Matilde Fondo, Julio Corredoira-Vázquez, Ana M García-Deibe, Jesús Sanmartín-Matalobos, Juan Manuel Herrera, Enrique Colacio
A new H3L Schiff base ligand with three defined compartments, namely, two internal NNO and one external O6, was designed to allocate metal ions of different size. This ligand allows isolating heterodinuclear [ZnLn(HL)(NO3)(OAc)(D)](NO3) (Ln = Tb, D = H2O, ZnTb; Ln = Dy, D = CH3OH, ZnDy; and Ln = Er, D = CH3OH, ZnEr) complexes, where one of the NNO pockets allocates a zinc(II) ion, while the other one is empty, or heterotrinuclear [Zn2Ln(L)(NO3)2(OAc)2(H2O)] (Ln = Dy, Zn2Dy and Ln = Er, Zn2Er) compounds, where each NNO compartment accommodates Zn(II)...
April 28, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28453274/a-porous-array-of-clock-qubits
#7
Joseph M Zadrozny, Audrey T Gallagher, T David Harris, Danna E Freedman
The command of atomic-level spatial control over qubits, the fundamental units of both quantum information processing systems and quantum sensors, constitutes a crucial cross-field challenge. Toward this end, embedding electronic spin based qubits within the framework of a crystalline porous material is a promising approach to create precise arrays of qubits. Realizing porous hosts for qubits would also impact the emerging field of quantum sensing, whereby porosity enables analytes to infuse into a sensor matrix...
April 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28453245/external-magnetic-field-enhanced-chemo-photothermal-combination-tumor-therapy-via-iron-oxide-nanoparticles
#8
Xiaomeng Guo, Wei Li, Lihua Luo, Zuhua Wang, Qingpo Li, Fenfen Kong, Hanbo Zhang, Jie Yang, Chunqi Zhu, Yongzhong Du, Jian You
The development of multifunctional nanoplatforms based on magnetic nanoparticles (MNPs) has attracted increasing attention. MNPs especially exhibit excellent responsiveness under the guidance of an external magnetic field (MF), resulting in tumor-specific, targeted delivery. The behavior and magnetic-targeting efficiency of MNPs largely depend on their physiochemical properties, especially the particle size; however, the optimal size range may vary across the multiple bioapplications associated with multifunctional nanoparticles...
April 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28449298/all-silicon-switchable-magnetoelectric-effect-via-interlayer-exchange-coupling
#9
Hang Liu, Jia Tao Sun, Huixia Fu, Peijie Sun, Yuanping Feng, Sheng Meng
The magnetoelectric (ME) effect originating from the effective coupling between electric field and magnetism is an exciting frontier in nanoscale science such as magnetic tunneling junction (MTJ), ferroelectric/piezoelectric heterojunctions etc. The realization of switchable ME effect under external electric field in d^0 semiconducting materials of single composition is needed especially for all-silicon spintronics applications because of its natural compatibility with current industry. We employ the density functional theory (DFT) to reveal that the pristine Si(111)-√3×√3R30º (Si√3 hereafter) reconstructed surfaces of thin films with thickness smaller than eleven bilayers support sizeable linear ME effect with switchable direction of magnetic moment under external electric field...
April 27, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28448900/dual-responsive-magnetic-composite-nanogels-for-thermo-chemotherapy
#10
S Indulekha, P Arunkumar, D Bahadur, R Srivastava
With the onset of hyperthermia and their advantage in increasing vascular perfusion and permeability in the cancer milieu, thermo-responsive polymers have become an attractive candidate for designing therapeutic nano-vehicles for targeted on-demand delivery of bioactive agents. For this purpose, we developed a dual (thermo- and pH-) responsive nanotherapeutic composite system rendering a combinational therapy of hyperthermia mediated drug delivery. This composite system comprises of magnetic chitosan-g-PNVCL (MCP) polymeric nanogels loaded with anticancer drug, Doxorubicin (DOX)...
April 19, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28448878/rapid-extraction-of-uranium-from-sea-water-using-fe3o4-and-humic-acid-coated-fe3o4-nanoparticles
#11
Pallavi Singhal, Sanjay K Jha, Shailaja P Pandey, Suman Neogy
Uranium is one of the most toxic elements present in the environment and a number of methods have been developed for its extraction. Herein we have demonstrated a new method using magnetic nanoparticles (NPs) that can be used for uranium extraction from water and sea water matrix. Fe3O4 and humic acid (HA) coated Fe3O4 NPs with different amount of HA coating were synthesized and uranium sorption from water and sea water matrix was demonstrated. It was observed that sorption increases with increase in amount of HA coating...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448445/horizontal-directional-drilling-length-detection-technology-while-drilling-based-on-bi-electro-magnetic-sensing
#12
Yudan Wang, Guojun Wen, Han Chen
The drilling length is an important parameter in the process of horizontal directional drilling (HDD) exploration and recovery, but there has been a lack of accurate, automatically obtained statistics regarding this parameter. Herein, a technique for real-time HDD length detection and a management system based on the electromagnetic detection method with a microprocessor and two magnetoresistive sensors employing the software LabVIEW are proposed. The basic principle is to detect the change in the magnetic-field strength near a current coil while the drill stem and drill-stem joint successively pass through the current coil forward or backward...
April 27, 2017: Sensors
https://www.readbyqxmd.com/read/28448428/therapeutic-ultrasound-in-navicular-stress-injuries-in-elite-track-and-field-athletes
#13
Nikolaos Malliaropoulos, Dimosthenis Alaseirlis, George Konstantinidis, Agapi Papalada, Ioannis Tsifountoudis, Kosmas Petras, Nicola Maffulli
OBJECTIVE: To ascertain whether therapeutic ultrasound (TUS) can be used to assess the progression of conservative management in navicular stress injuries. DESIGN: This is a prospective, clinical case series. Level of evidence IV. SETTING: All participants were examined and followed up in a private Sports Injury Clinic. PARTICIPANTS: Ten elite track and field athletes with severe dorsal midfoot pain over the navicular bone participated in this study...
May 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28448273/magnetic-induction-spectroscopy-mis-probe-design-for-cervical-tissue-measurements
#14
Jau-Yi Wang, Timothy Healey, Anthony Barker, Brian Brown, Chris Monk, Dilly Anumba
OBJECTIVE: Gradiometers have the advantage of increasing measuring sensitivity, which is particularly useful in magnetic induction spectroscopy (MIS) for bio-impedance measurements. Traditional gradiometers use a pair of field sensing coils equally distant and on opposite sides of a drive coil, which provides high immunity to interference. In this paper, a ferrite-cored coaxial gradiometer probe of 29 mm diameter has been developed for measuring the impedance spectra of cervical tissues in vivo...
May 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28448235/intracranial-artery-steno-occlusion-diagnosis-by-using-three-dimensional-parallel-multichannel-transmission-mr-imaging
#15
Mi Sun Chung, Seung Chai Jung, Seon-Ok Kim, Ho Sung Kim, Choong Gon Choi, Sang Joon Kim, Sun U Kwon, Dong-Wha Kang, Jong S Kim
Purpose To determine whether magnetic resonance (MR) imaging by using two-dimensional spatially selective radiofrequency (RF) excitation pulses (zoomed MR imaging) is a reliable method for the diagnosis of intracranial artery steno-occlusion compared with full-field-of-view (FOV) MR imaging. Materials and Methods The institutional review board approved this retrospective study and informed consent was waived. From December 2014 to August 2015, 88 patients who underwent both full-FOV MR imaging and zoomed MR imaging for further evaluation of intracranial artery steno-occlusion at prior luminal evaluation were included...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28448037/cooling-an-optically-trapped-ultracold-fermi-gas-by-periodical-driving
#16
Jiaming Li, Leonardo F de Melo, Le Luo
We present a cooling method for a cold Fermi gas by parametrically driving atomic motions in a crossed-beam optical dipole trap (ODT). Our method employs the anharmonicity of the ODT, in which the hotter atoms at the edge of the trap feel the anharmonic components of the trapping potential, while the colder atoms in the center of the trap feel the harmonic one. By modulating the trap depth with frequencies that are resonant with the anharmonic components, we selectively excite the hotter atoms out of the trap while keeping the colder atoms in the trap, generating parametric cooling...
March 30, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447670/harmonic-trap-resonance-enhanced-synthetic-atomic-spin-orbit-coupling
#17
Ling-Na Wu, Xin-Yu Luo, Zhi-Fang Xu, Masahito Ueda, Ruquan Wang, L You
Spin-orbit coupling (SOC) plays an essential role in many exotic and interesting phenomena in condensed matter physics. In neutral-atom-based quantum simulations, synthetic SOC constitutes a key enabling element. The strength of SOC realized so far is limited by various reasons or constraints. This work reports tunable SOC synthesized with a gradient magnetic field (GMF) for atoms in a harmonic trap. Nearly ten-fold enhancement is observed when the GMF is modulated near the harmonic-trap resonance in comparison with the free-space situation...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28447632/a-universal-model-for-solar-eruptions
#18
Peter F Wyper, Spiro K Antiochos, C Richard DeVore
Magnetically driven eruptions on the Sun, from stellar-scale coronal mass ejections to small-scale coronal X-ray and extreme-ultraviolet jets, have frequently been observed to involve the ejection of the highly stressed magnetic flux of a filament. Theoretically, these two phenomena have been thought to arise through very different mechanisms: coronal mass ejections from an ideal (non-dissipative) process, whereby the energy release does not require a change in the magnetic topology, as in the kink or torus instability; and coronal jets from a resistive process involving magnetic reconnection...
April 26, 2017: Nature
https://www.readbyqxmd.com/read/28447080/doping-of-nematic-cyanobiphenyl-liquid-crystals-with-mesogen-hybridized-magnetic-nanoparticles
#19
Ingo Appel, Hajnalka Nádasi, Christian Reitz, Nerea Sebastián, Horst Hahn, Alexey Eremin, Ralf Stannarius, Silke S Behrens
Magnetic nanoparticles (MNPs) functionalized with (pro-)mesogenic ligands are implemented into a nematic liquid crystal (LC) and studied regarding both colloidal stability and magneto-optical behavior. In this study, the particle surface is specifically engineered to tune the MNP interactions with the LC host. For this purpose, four types of (pro-)mesogenic ligands (ML) are synthesized, which are composed of three structural parts, i.e., a rigid, LC motif (i.e., cyanobiphenyl) and a functional group for nanoparticle binding, both linked via a flexible spacer of different alkyl chain lengths...
April 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28446619/candidate-genes-mediating-magnetoreception-in-rainbow-trout-oncorhynchus-mykiss
#20
Robert R Fitak, Benjamin R Wheeler, David A Ernst, Kenneth J Lohmann, Sönke Johnsen
Diverse animals use Earth's magnetic field in orientation and navigation, but little is known about the molecular mechanisms that underlie magnetoreception. Recent studies have focused on two possibilities: (i) magnetite-based receptors; and (ii) biochemical reactions involving radical pairs. We used RNA sequencing to examine gene expression in the brain of rainbow trout (Oncorhynchus mykiss) after exposure to a magnetic pulse known to disrupt magnetic orientation behaviour. We identified 181 differentially expressed genes, including increased expression of six copies of the frim gene, which encodes a subunit of the universal iron-binding and trafficking protein ferritin...
April 2017: Biology Letters
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