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https://www.readbyqxmd.com/read/28427685/fe3o4-hydroxyapatite-graphene-quantum-dots-as-a-novel-nano-sorbent-for-preconcentration-of-copper-residue-in-thai-food-ingredients-optimization-of-ultrasound-assisted-magnetic-solid-phase-extraction
#1
Phitchan Sricharoen, Nunticha Limchoowong, Yonrapach Areerob, Prawit Nuengmatcha, Suchila Techawongstien, Saksit Chanthai
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28337970/quantum-coherence-phenomenon-in-disordered-bi2sete2-topological-single-crystal-effect-of-annealing
#2
E P Amaladass, T R Devidas, Shilpam Sharma, Awadhesh Mani
We report a comparative magnetotransport study on pristine and annealed Bi2SeTe2 single crystals. The pristine sample shows a metallic trend from 300 to 180 K, and an insulating behavior for T  <  180 K, whereas the annealed sample exhibits an insulating nature in the entire 4.2-300 K temperature range. Magnetoresistance (MR) of pristine and annealed samples reveals contrasting behaviour as a function of temperature (T) and magnetic field (B). At 4.2 K, the pristine sample shows weak antilocalization (WAL) behavior at low fields and transforms to weak localization (WL) behavior (negative MR) for B  >  2...
May 4, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28335359/temperature-and-angle-dependent-magnetic-properties-of-ni-nanotube-arrays-fabricated-by-electrodeposition-in-polycarbonate-templates
#3
Yonghui Chen, Chen Xu, Yibo Zhou, Khan Maaz, Huijun Yao, Dan Mo, Shuangbao Lyu, Jinglai Duan, Jie Liu
Parallel arrays of Ni nanotubes with an external diameter of 150 nm, a wall thickness of 15 nm, and a length of 1.2 ± 0.3 µm were successfully fabricated in ion-track etched polycarbonate (PC) templates by electrochemical deposition. The morphology and crystal structure of the nanotubes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Structural analyses indicate that Ni nanotubes have a polycrystalline structure with no preferred orientation...
December 1, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28330921/linking-magnetite-in-the-abdomen-of-honey-bees-to-a-magnetoreceptive-function
#4
Veronika Lambinet, Michael E Hayden, Katharina Reigl, Surath Gomis, Gerhard Gries
Previous studies of magnetoreception in honey bees, Apis mellifera, focused on the identification of magnetic material, its formation, the location of the receptor and potential underlying sensory mechanisms, but never directly linked magnetic material to a magnetoreceptive function. In our study, we demonstrate that ferromagnetic material consistent with magnetite plays an integral role in the bees' magnetoreceptor. Subjecting lyophilized and pelletized bee tagmata to analyses by a superconducting quantum interference device generated a distinct hysteresis loop for the abdomen but not for the thorax or the head of bees, indicating the presence of ferromagnetic material in the bee abdomen...
March 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28322380/tm-iii-complexes-undergoing-slow-relaxation-of-magnetization-exchange-coupling-and-aging-effects
#5
A Amjad, A Figuerola, L Sorace
The present study focuses on the dynamic magnetic behaviour of exchange coupled 3d-4f complexes containing the scarcely investigated non-Kramers Tm(3+) center, the 3d metal ions being either the low-spin Fe(3+) (1) or the diamagnetic Co(3+) (2) ion. Both complexes display field-induced slow relaxation of magnetization. The field and temperature dependences of the relaxation rate provided indication of relevant contributions from quantum tunnelling, direct, Orbach and Raman processes, with only minor effects from exchange coupling interactions...
March 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28314206/comparison-of-potassium-and-sodium-binding-in-vivo-and-in-agarose-samples-using-tqtppi-pulse-sequence
#6
Victor D Schepkin, Andreas Neubauer, Armin M Nagel, Thomas F Budinger
Potassium and sodium specific binding in vivo were explored at 21.1T by triple quantum (TQ) magnetic resonance (MR) signals without filtration to achieve high sensitivities and precise quantifications. The pulse sequence used time proportional phase increments (TPPI). During simultaneous phase-time increments, it provided total single quantum (SQ) and TQ MR signals in the second dimension at single and triple quantum frequencies, respectively. The detection of both TQ and SQ signals was performed at identical experimental conditions and the resulting TQ signal equals 60±3% of the SQ signal when all ions experience sufficient time for binding...
March 6, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28284158/synthesis-spectroscopic-dft-and-in-vitro-biological-studies-of-vanadium-iii-complexes-of-aryldithiocarbonates
#7
Savit Andotra, Sandeep Kumar, Mandeep Kour, Vikas, Chayawan, Vishal Sharma, Sundeep Jaglan, Sushil K Pandey
Vanadium(III) tris(dithiocarbonates), [(ROCS2)3V] (R=o-, m-, p-CH3C6H4 and 4-Cl-3-CH3C6H3) and donor stabilized addition complexes [(ROCS2)2V(Cl)·L] [L=NC5H5 or P(C6H5)3] were synthesized and characterized by elemental analyses, IR, mass, TGA/DTA, SEM magnetic susceptibility and heteronuclear NMR ((1)H, (13)C and (31)P) spectroscopic studies. The cytotoxicity of the complexes was measured in vitro using the cultivated human cell lines. In addition, the antioxidant activities of the ligands and its vanadium complexes were also investigated through their scavenging effect on DPPH radicals...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28272466/designing-exotic-many-body-states-of-atomic-spin-and-motion-in-photonic-crystals
#8
Marco T Manzoni, Ludwig Mathey, Darrick E Chang
Cold atoms coupled to photonic crystals constitute an exciting platform for exploring quantum many-body physics. For example, such systems offer the potential to realize strong photon-mediated forces between atoms, which depend on the atomic internal (spin) states, and where both the motional and spin degrees of freedom can exhibit long coherence times. An intriguing question then is whether exotic phases could arise, wherein crystalline or other spatial patterns and spin correlations are fundamentally tied together, an effect that is atypical in condensed matter systems...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28124842/isolation-chemical-characterization-and-immunomodulatory-activity-of-naturally-acetylated-hemicelluloses-from-bamboo-shavings
#9
Ju-Qing Huang, Rui-Ting Qi, Mei-Rong Pang, Cong Liu, Guang-Yu Li, Ying Zhang
Bamboo shavings, the outer or intermediate layer of bamboo stems, are the bulk of by-products produced in bamboo processing. In this study we investigated the isolation, chemical characterization, and immunostimulatory activity in vitro of the hemicelluloses from bamboo shavings. Shavings were first pretreated by steam explosion. The optimal pretreatment was found to be steam explosion at 2.2 MPa for 1 min. Following this pretreatment, the yield of hemicelluloses reached (2.05±0.22)% (based on the dry dewaxed raw materials), which was 5...
2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/27792667/crossover-from-one-to-three-dimensional-behavior-in-the-s%C3%A2-%C3%A2-%C3%A2-%C3%A2-1-2-heisenberg-antiferromagnet-cu-n2h5-2-so4-2
#10
A Paduan-Filho, A P Vieira, J G A Ramon, R S Freitas
From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-1D antiferromagnet Cu(N2H5)2(SO4)2. On cooling and at zero magnetic field this compound enters a 1D regime with short-range magnetic correlations, marked by a broad maximum in the specific heat and magnetic susceptibility at [Formula: see text] K, followed by a tridimensional antiferromagnetically ordered phase below [Formula: see text] K induced by small interchain couplings...
October 28, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27748749/a-prevalent-intraresidue-hydrogen-bond-stabilizes-proteins
#11
Robert W Newberry, Ronald T Raines
Current limitations in de novo protein structure prediction and design suggest an incomplete understanding of the interactions that govern protein folding. Here we demonstrate that previously unappreciated hydrogen bonds occur within proteins between the amide proton and carbonyl oxygen of the same residue. Quantum calculations, infrared spectroscopy, and nuclear magnetic resonance spectroscopy show that these interactions share hallmark features of canonical hydrogen bonds. Biophysical analyses demonstrate that selective attenuation or enhancement of these C5 hydrogen bonds affects the stability of synthetic β-sheets...
December 2016: Nature Chemical Biology
https://www.readbyqxmd.com/read/27515383/experimental-and-theoretical-studies-on-inhibition-of-mild-steel-corrosion-by-some-synthesized-polyurethane-tri-block-co-polymers
#12
Sudershan Kumar, Hemlata Vashisht, Lukman O Olasunkanmi, Indra Bahadur, Hemant Verma, Gurmeet Singh, Ime B Obot, Eno E Ebenso
Polyurethane based tri-block copolymers namely poly(N-vinylpyrrolidone)-b-polyurethane-b-poly(N-vinylpyrrolidone) (PNVP-PU) and poly(dimethylaminoethylmethacrylate)-b-polyurethane-b-poly(dimethylaminoethylmethacrylate) (PDMAEMA-PU) were synthesized through atom transfer radical polymerization (ATRP) mechanism. The synthesized polymers were characterized using nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC) methods. The corrosion inhibition performances of the compounds were investigated on mild steel (MS) in 0...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27466151/nearly-massless-dirac-fermions-hosted-by-sb-square-net-in-bamnsb2
#13
Jinyu Liu, Jin Hu, Huibo Cao, Yanglin Zhu, Alyssa Chuang, D Graf, D J Adams, S M A Radmanesh, L Spinu, I Chiorescu, Zhiqiang Mao
Layered compounds AMnBi2 (A = Ca, Sr, Ba, or rare earth element) have been established as Dirac materials. Dirac electrons generated by the two-dimensional (2D) Bi square net in these materials are normally massive due to the presence of a spin-orbital coupling (SOC) induced gap at Dirac nodes. Here we report that the Sb square net in an isostructural compound BaMnSb2 can host nearly massless Dirac fermions. We observed strong Shubnikov-de Haas (SdH) oscillations in this material. From the analyses of the SdH oscillations, we find key signatures of Dirac fermions, including light effective mass (~0...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27436966/effects-on-a-landau-type-system-for-a-neutral-particle-with-no-permanent-electric-dipole-moment-subject-to-the-kratzer-potential-in-a-rotating-frame
#14
Abinael B Oliveira, Knut Bakke
The behaviour of a neutral particle (atom, molecule) with an induced electric dipole moment in a region with a uniform effective magnetic field under the influence of the Kratzer potential (Kratzer 1920 Z. Phys. 3, 289-307. (doi:10.1007/BF01327754)), and rotating effects is analysed. It is shown that the degeneracy of the Landau-type levels is broken and the angular frequency of the system acquires a new contribution that stems from the rotation effects. Moreover, in the search for bound state solutions, it is shown that the possible values of this angular frequency of the system are determined by the quantum numbers associated with the radial modes and the angular momentum, the angular velocity of the rotating frame and by the parameters associated with the Kratzer potential...
June 2016: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27356927/electrochemiluminescence-of-graphitic-carbon-nitride-and-its-application-in-ultrasensitive-detection-of-lead-ii-ions
#15
Yan Zhang, Lina Zhang, Qingkun Kong, Shenguang Ge, Mei Yan, Jinghua Yu
Graphitic carbon nitride (g-C3N4) materials with a layered structure have unusual physicochemical properties. Herein it was shown that g-C3N4 quantum dots (QDs) obtained through a thermal-chemical etching route exhibited attractive upconversion and electrochemiluminescence (ECL) properties. After modification on nanoporous gold (NPG) with a sponge-like porous structure, g-C3N4 QDs were employed to fabricate an ECL sensor for the determination of Pb(2+) using target - dependent DNAzyme as the recognition unit...
October 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27334004/unique-chlorophylls-in-picoplankton-prochlorococcus-sp-physicochemical-properties-of-divinyl-chlorophylls-and-the-discovery-of-monovinyl-chlorophyll-b-as-well-as-divinyl-chlorophyll-b-in-the-species-prochlorococcus-nies-2086
#16
REVIEW
Hirohisa Komatsu, Katsuhiro Wada, Terumitsu Kanjoh, Hideaki Miyashita, Mayumi Sato, Masanobu Kawachi, Masami Kobayashi
In this review, we introduce our recent studies on divinyl chlorophylls functioning in unique marine picoplankton Prochlorococcus sp. (1) Essential physicochemical properties of divinyl chlorophylls are compared with those of monovinyl chlorophylls; separation by normal-phase and reversed-phase high-performance liquid chromatography with isocratic eluent mode, absorption spectra in four organic solvents, fluorescence information (emission spectra, quantum yields, and life time), circular dichroism spectra, mass spectra, nuclear magnetic resonance spectra, and redox potentials...
December 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27309380/evaluating-the-reduced-hydrophobic-taste-sensor-response-of-dipeptides-by-theasinensin-a-by-using-nmr-and-quantum-mechanical-analyses
#17
Jian Guo, Naoto Hirasaki, Yuji Miyata, Kazunari Tanaka, Takashi Tanaka, Xiao Wu, Yusuke Tahara, Kiyoshi Toko, Toshiro Matsui
The current study demonstrated that theasinensin A (TSA) had a potential to form the complex with hydrophobic Trp-containing dipeptides, and to reduce their membrane potential by artificial-lipid membrane taste sensor. At a 1:3 molar ratio of the 6 Trp-containing dipeptides together with TSA, we observed a significant chemical shift of the protons of the dipeptides (Δδ) to a high magnetic field, when analyzed using 1H-nuclear-magnetic resonance (NMR) spectroscopy. The Δδ values were correlated with the hydrophobicity (log P) of the dipeptides and significant correlations were obtained (P = 0...
2016: PloS One
https://www.readbyqxmd.com/read/27284670/quadrupole-order-in-the-frustrated-pyrochlore-tb_-2-x-ti_-2-x-o_-7-y
#18
H Takatsu, S Onoda, S Kittaka, A Kasahara, Y Kono, T Sakakibara, Y Kato, B Fåk, J Ollivier, J W Lynn, T Taniguchi, M Wakita, H Kadowaki
A hidden order that emerges in the frustrated pyrochlore Tb_{2+x}Ti_{2-x}O_{7+y} with T_{c}=0.53  K is studied using specific heat, magnetization, and neutron scattering experiments on a high-quality single crystal. Semiquantitative analyses based on a pseudospin-1/2 Hamiltonian for ionic non-Kramers magnetic doublets demonstrate that it is an ordered state of electric quadrupole moments. The elusive spin liquid state of the nominal Tb_{2}Ti_{2}O_{7} is most likely a U(1) quantum spin-liquid state.
May 27, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27254797/probing-rubber-cross-linking-generation-of-industrial-polymer-networks-at-nanometer-scale
#19
Brice Gabrielle, Emmanuel Gomez, Jean-Pierre Korb
We present improved analyses of rheometric torque measurements as well as (1)H double-quantum (DQ) nuclear magnetic resonance (NMR) buildup data on polymer networks of industrial compounds. This latter DQ NMR analysis allows finding the distribution of an orientation order parameter (Dres) resulting from the noncomplete averaging of proton dipole-dipole couplings within the cross-linked polymer chains. We investigate the influence of the formulation (filler and vulcanization systems) as well as the process (curing temperature) ending to the final polymer network...
June 23, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27140970/loschmidt-echo-in-many-spin-systems-contrasting-time-scales-of-local-and-global-measurements
#20
Pablo R Zangara, Denise Bendersky, Patricia R Levstein, Horacio M Pastawski
A local excitation in a quantum many-spin system evolves deterministically. A time-reversal procedure, involving the inversion of the signs of every energy and interaction, should produce the excitation revival. This idea, experimentally coined in nuclear magnetic resonance, embodies the concept of the Loschmidt echo (LE). While such an implementation involves a single spin autocorrelation M(1,1), i.e. a local LE, theoretical efforts have focused on the study of the recovery probability of a complete many-body state, referred to here as global or many-body LE MMB Here, we analyse the relation between these magnitudes, with regard to their characteristic time scales and their dependence on the number of spins N We show that the global LE can be understood, to some extent, as the simultaneous occurrence of N independent local LEs, i...
June 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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