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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/28454217/paraganglioma-of-the-organ-of-zuckerkandl-associated-with-a-somatic-hif2%C3%AE-mutation-a-case-report
#2
Ahmad Esmaeel Abdullah, Carole Guerin, Alessio Imperiale, Anne Barlier, Stéphanie Battini, Morgane Pertuit, Philippe Roche, Wassim Essamet, Bernard Vaisse, Karel Pacak, Fréderic Sebag, David Taïeb
Paragangliomas of the organ of Zuckerkandl (OZ-PGL) are rare tumors that, in >70% of cases, occur in association with succinate dehydrogenase complex iron sulfur subunit B (SDHB) or SDHD gene mutations. The aim of the current study was to determine whether a somatic genetic defect in the hypoxia-inducible factor 2α (HIF2α) gene was present in a case of sporadic OZ-PGL. A 32-year-old African female presented with uncontrolled hypertension during the first trimester of pregnancy. A diagnostic hysteroscopy was performed 3 months after delivery, precipitating a hypertensive crisis...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28454158/adding-a-spin-to-kerker-s-condition-angular-tuning-of-directional-scattering-with-designed-excitation
#3
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/28454152/88-conversion-efficiency-with-an-atomic-spin-wave-mediated-mode-selection
#4
Jinxian Guo, L Q Chen, Peiyu Yang, Zhengjun Li, Yuan Wu, Xiaotian Feng, Chun-Hua Yuan, Z Y Ou, Weiping Zhang
In studying quantum correlation and quantum memory of continuous variables of light fields and atoms, a crucial step is the retrieval of the quantum fields by converting an atomic spin wave to light, and retrieval efficiency is a crucial parameter. In this Letter, we implement a double-pass Raman scheme in Rb87 by incorporating coherent feedback. We find that the transfer efficiency from an atomic spin wave, which is generated from a Raman process in a high gain regime, to light fields is enhanced by the double-pass scheme as compared to the commonly used single-pass scheme...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28453814/graphene-specimen-support-technique-for-low-voltage-stem-imaging
#5
Masao Yamashita, Matthew Ryan Leyden, Hidehito Adaniya, Martin Philip Cheung, Teruhisa Hirai, Yabing Qi, Tsumoru Shintake
The scanning transmission electron microscopy (STEM) mode of today's field emission scanning electron microscopes enables sub-nanometer resolution imaging. Graphene is a single-atom thick, electrically conductive material, making it an excellent specimen support for the low voltage STEM imaging of nanometer-sized objects such as viruses. Here we present low voltage STEM images of bacteriophage T4 recorded on highly cleaned graphene films. The results show that ultrathin graphene support films markedly improve image signal at low accelerating voltages...
April 27, 2017: Microscopy
https://www.readbyqxmd.com/read/28453433/diagnostic-accuracy-of-selective-3-t-mr-neurography-guided-retroperitoneal-genitofemoral-nerve-blocks-for-the-diagnosis-of-genitofemoral-neuralgia
#6
Jan Fritz, A Lee Dellon, Eric H Williams, Gedge D Rosson, Allan J Belzberg, Frederick E Eckhauser
Purpose To determine if 3-T magnetic resonance (MR) neurography-guided retroperitoneal genitofemoral nerve (GFN) blocks are safe and effective for the diagnosis of genitofemoral neuralgia. Materials and Methods Following institutional review board approval and informed consent, 26 subjects (16 men, 10 women; mean age, 42 years [range, 24-78 years]; mean body mass index, 28 kg/m(2) [range, 20-35 kg/m(2)]) with intractable groin pain were included. By using a 3-T MR imaging system, intermediate-weighted turbo spin-echo pulse sequences, and MR-conditional needles, diagnostic MR neurography-guided GFN blocks were performed in the retroperitoneum...
April 28, 2017: Radiology
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/28453273/half-metallicity-in-one-dimensional-metal-trihydride-molecular-nanowires
#8
Xiuling Li, Haifeng Lv, Jun Dai, Liang Ma, Xiao Cheng Zeng, Xiaojun Wu, Jinlong Yang
The development of one-dimensional (1D) molecular nanowires with high spin-polarization is important for both fundamental research and practical applications in nanoscale spintronics. Herein, we report new 1D metal trihydride molecular nanowires MH3 (M=Sc, Cr, Mn, and Co) with versatile magnetic properties on the basis of first-principles calculations and molecular assembly of their molecular motifs. Among the 1D nanowires considered, CrH3, MnH3, and CoH3 are either antiferromagnetic or ferromagnetic in their ground states...
April 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28449348/thienylquinonoidal-porphyrins-and-hexaphyrins-with-singlet-diradical-ground-states
#9
Atsuhiro Osuka, Koji Naoda, Jun Oh Kim, Daiki Shimizu, Ko Furukawa, Dongho Kim
To explore stable organic diradicaloids, meso-thienylquinonoid-substituted porphyrins Pn and hexaphyrins Hn, where "n" denotes the number of thienyl units in the meso-substituents, were synthesized. While P0 was identified as a closed-shell quinonoid, P1 was shown to possess significant diradical character with diradical character index (y) of 0.99 and quite small singlet-triplet energy gap (ΔES-T) of -0.13 kcal·mol-1. P1 was certainly stable, allowing its isolation, but decomposed gradually in solution. In the hexaphyrin series, it was shown that H0 and H1 were closed-shell quinonoids, but H2 was a highly stable diradicaloid with y = 0...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28449298/all-silicon-switchable-magnetoelectric-effect-via-interlayer-exchange-coupling
#10
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/28448714/octopus-inspired-assembly-of-nanosucker-arrays-for-dry-wet-adhesion
#11
Ying-Chu Chen, Hongta Yang
The octopus is able to adhere to slippery, fouled and irregular surfaces in the marine intertidal environment, because of its periodic infundibulum-shaped suckers on the arms. Here, we report a scalable self-assembly technique for fabricating adhesion materials that mimic octopus-sucker functionality. By utilizing spin-coated two-dimensional colloidal crystals as templates, non-close-packed nanosucker arrays are patterned on silicone substrates. The resulting nanosuckers can be deformed to exhibit great adhesive capacities on both micro-rough and flat surfaces in dry and wet environments...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28447786/a-3d-mas-nmr-experiment-utilizing-through-space-15n-15n-correlations
#12
Kevin J Donovan, Robert Silvers, Sara Linse, Robert G Griffin
We demonstrate a novel 3D NNC magic angle spinning (MAS) NMR experiment that generates 15N- 15N internuclear contacts in protein systems using an optimized 15N- 15N proton assisted recoupling (PAR) mixing period and a 13C dimension for improved resolution. The optimized PAR condition permits the acquisition of high signal-to-noise 3D data that enables backbone chemical shift assignments using a strategy that is complementary to current schemes. The spectra can also provide distance constraints. The utility of the experiment is demonstrated on an M0Ab1-42 fibril sample that yields high-quality data that is readily assigned and interpreted...
April 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28447677/investigation-of-easy-plane-magnetic-anisotropy-in-p-ligand-square-pyramidal-co-ii-single-ion-magnets
#13
Amit Kumar Mondal, Jesús Jover, Eliseo Ruiz, Sanjit Konar
In this work we report two pentacoordinated Co(II)-P4X1 Single Ion Magnets (SIMs) based on P-donor ligands. The tetradentate ligand tris[2-(diphenylphosphino)ethyl]phosphine allows the obtention of the isostructural square pyramidal [Co(PP3)Cl]·ClO4 (1) and [Co(PP3)Br]·ClO4 (2) complexes. Consistent theoretical and experimental studies indicate that these complexes have a high spin (S = 3/2) ground state and suggest that the relaxation dynamics is governed by ground state quantum tunneling, whereas its temperature dependence is directed by optical or acoustic Raman processes...
April 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28447670/harmonic-trap-resonance-enhanced-synthetic-atomic-spin-orbit-coupling
#14
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/28447597/resonant-and-non-resonant-magnetic-scatterings-with-circularly-polarized-x-rays-magnetic-scattering-factor-and-electron-density-of-gadolinium-iron-garnet
#15
Yo Sasaki, Maki Okube, Satoshi Sasaki
Theoretical and experimental studies on resonant magnetic scattering have been carried out using circularly polarized X-rays. Polarization dependence of the asymmetric ratio between right- and left-handed polarized scattering amplitudes has revealed that resonant and non-resonant magnetic scatterings can be observed simultaneously. In this study, synchrotron X-ray intensity experiments were conducted on Gd iron garnet (GdIG) at the pre-edge of the Fe K absorption edge. The asymmetric ratio between circular polarizations exhibited three peaks due to the resonant magnetic responses of Fe(3+) in the Fe2 (24d) site...
May 1, 2017: Acta Crystallographica. Section A, Foundations and Advances
https://www.readbyqxmd.com/read/28446768/linear-dynamics-of-classical-spin-as-m%C3%A3-bius-transformation
#16
Alexey Galda, Valerii М Vinokur
Though the overwhelming majority of natural processes occur far from the equilibrium, general theoretical approaches to non-equilibrium phase transitions remain scarce. Recent breakthroughs introduced a description of open dissipative systems in terms of non-Hermitian quantum mechanics enabling the identification of a class of non-equilibrium phase transitions associated with the loss of combined parity (reflection) and time-reversal symmetries. Here we report that the time evolution of a single classical spin (e...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28445998/infrared-raman-and-magnetic-resonance-spectroscopic-study-of-sio2-c-nanopowders
#17
Dariya Savchenko, Vladimir Vorliček, Ekaterina Kalabukhova, Aleksandr Sitnikov, Andrii Vasin, Dmytro Kysil, Stanislav Sevostianov, Valentyn Tertykh, Alexei Nazarov
Optical and magnetic properties of SiO2:C nanopowders obtained by chemical and thermal modification of fumed silica were studied by Fourier transform infrared spectroscopy, Raman, continuous wave (CW) electron paramagnetic resonance (EPR), echo-detected EPR and pulsed electron nuclear double resonance (ENDOR) spectroscopy. Two overlapping signals of Lorentzian lineshape were detected in CW EPR spectra of the initial SiO2:C. The EPR signal at g = 2.0055(3) is due to the silicon dangling bonds, which vanishes after thermal annealing, and the second EPR signal at g = 2...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28445803/jetvalve-rapid-manufacturing-of-biohybrid-scaffolds-for-biomimetic-heart-valve-replacement
#18
Andrew K Capulli, Maximillian Y Emmert, Francesco S Pasqualini, Debora Kehl, Etem Caliskan, Johan U Lind, Sean P Sheehy, Sung Jin Park, Seungkuk Ahn, Benedikt Weber, Josue A Goss, Simon P Hoerstrup, Kevin Kit Parker
Tissue engineered scaffolds have emerged as a promising solution for heart valve replacement because of their potential for regeneration. However, traditional heart valve tissue engineering has relied on resource-intensive, cell-based manufacturing, which increases cost and hinders clinical translation. To overcome these limitations, in situ tissue engineering approaches aim to develop scaffold materials and manufacturing processes that elicit endogenous tissue remodeling and repair. Yet despite recent advances in synthetic materials manufacturing, there remains a lack of cell-free, automated approaches for rapidly producing biomimetic heart valve scaffolds...
April 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28445646/spinning-hierarchical-gold-nanowire-microfibers-by-shear-alignment-and-intermolecular-self-assembly
#19
Beate Reiser, Dominik Gerstner, Lola Gonzalez-Garcia, Johannes H M Maurer, Ioannis Kanelidis, Tobias Kraus
Hierarchical structures lend strength to natural fibers made of soft nanoscale building blocks. Intermolecular interactions connect the components at different levels of hierarchy, distribute stresses, and guarantee structural integrity under load. Here, we show that synthetic ultrathin gold nanowires with interacting ligand shells can be spun into biomimetic, free-standing microfibers. A solution spinning process first aligns the wires, then lets their ligand shells interact, and finally converts them into a hierarchical superstructure...
April 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28445603/alternating-flow-filtration-as-an-alternative-to-internal-spin-filter-based-perfusion-process-impact-on-productivity-and-product-quality
#20
María Bosco, Cristian Paillet, Laura Mauro, Ignacio Amadeo, Eduardo Orti, Guillermina Forno
No abstract text is available yet for this article.
April 26, 2017: Biotechnology Progress
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