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https://www.readbyqxmd.com/read/28531992/boronate-functionalized-hydrogel-as-a-novel-biosensing-interface-for-the-glycated-hemoglobin-a1c-hba1c-based-on-the-competitive-binding-with-signaling-glycoprotein
#1
Yong Duk Han, Ka Ram Kim, Yoo Min Park, Seung Yeon Song, Yong Ju Yang, Kangsun Lee, Yunhee Ku, Hyun C Yoon
According to recent increases in public healthcare costs associated with diabetes mellitus, the development of new glycemic monitoring techniques based on the biosensing of glycated hemoglobin A1c (HbA1c), a promising long-term glycemic biomarker, has become a major challenge. In the development of HbA1c biosensors for point-of-care applications, the selection of an effective biorecognition layer that provides a high reaction yield and specificity toward HbA1c is regarded as the most significant issue. To address this, we developed a novel HbA1c biosensing interfacial material by the integration of boronate hydrogel with glass fiber membrane...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531817/electronic-properties-and-gas-adsorption-behaviour-of-pristine-silicon-and-boron-doped-8-0-single-walled-carbon-nanotube-a-first-principles-study
#2
Mohd Asyadi Azam, Farizul Muiz Alias, Liew Weng Tack, Raja Noor Amalina Raja Seman, Mohamad Fariz Mohamad Taib
Carbon nanotubes (CNTs) have received enormous attention due to their fascinating properties to be used in various applications including electronics, sensing, energy storage and conversion. The first principles calculations within density functional theory (DFT) have been carried out in order to investigate the structural, electronic and optical properties of un-doped and doped CNT nanostructures. O2, CO2, and CH3OH have been chosen as gas molecules to study the adsorption properties based on zigzag (8,0) SWCNTs...
May 5, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28531091/ab-initio-studies-of-coherent-spin-transport-in-fe-hbn-graphene-van-der-waals-multilayers
#3
Aniekan Ukpong
This paper presents the results of ab initio studies of the electronic spin manipulation, inversion, filtering and transport using a ferromagnetic multilayer heterostructure. Spin-polarized electronic structure calculations are performed based on van der Waals density functional theory to give unique insights to the generation, manipulation and transport of coherent spin conductance. By using an exact theory of the self-consistent ground state of the Fe-hBN/graphene multilayer as a model of the magnetic tunnel junction, this paper unravels the hidden asymmetries in the spin-resolved charge densities...
May 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28530633/enhanced-spin-orbit-coupling-in-tetragonally-strained-fe-co-b-films
#4
Ruslan Salikhov, Ludwig Reichel, Benjamin Zingsem, Radu Abrudan, Alexander Edström, Danny Thonig, Jan Rusz, Olle Eriksson, Ludwig Schultz, Sebastian Fahler, Michael Farle, Ulf Wiedwald
Tetragonally strained interstitial Fe-Co-B alloys were synthesized as epitaxial films grown on a 20 nm thick Au0.55Cu0.45 buffer layer. Different ratios of the perpendicular to in-plane lattice constant c/a = 1.013, 1.034 and 1.02 were stabilized by adding interstitial boron with different concentrations 0, 4, and 10 at.%, respectively. Using ferromagnetic resonance (FMR) and x-ray magnetic circular dichroism (XMCD) we found that the total orbital magnetic moment significantly increases with increasing c/a ratio, indicating that reduced crystal symmetry and interstitial B leads to a noticeable enhancement of the effect of spin-orbit coupling (SOC) in the Fe-Co-B alloys...
May 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28526853/response-of-coral-calcification-and-calcifying-fluid-composition-to-thermally-induced-bleaching-stress
#5
J P D'Olivo, M T McCulloch
Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ(11)B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28525706/copper-catalyzed-selective-n-vinylation-of-3-hydroxyimino-indolin-2-ones-with-alkenyl-boronic-acids-synthesis-of-n-vinyl-nitrones-and-spirooxindoles
#6
Chun-Hua Chen, Qing-Qing Liu, Xiao-Pan Ma, Yu Feng, Cui Liang, Cheng-Xue Pan, Gui-Fa Su, Dong-Liang Mo
A copper-catalyzed selective cross-coupling reaction of 3-(hydroxyimino)indolin-2-ones with alkenyl boronic acids to access (E)-N-vinyl oxindole nitrones has been achieved under mild conditions. The studies showed that catalytic copper salt selectively gave mono N-vinylation products while 2.0 equiv of copper salt provided double N-vinylation products. The control experiments revealed that the carbonyl group in 3-(hydroxyimino)indolin-2-one played important roles on N-vinylation. Furthermore, the prepared N-vinyl oxindole nitrones could be converted to spirooxindoles in good yields under thermal conditions...
May 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28525685/asymmetric-synthesis-of-secondary-and-tertiary-boronic-esters
#7
Varinder Kumar Aggarwal, Beatrice Collins, Claire Wilson, Eddie Myers
Non-racemic chiral boronic esters are recognised as immensely valuable building blocks in modern organic synthesis. Their stereospecific transformation into a variety of functional group - from amines and halides to arenes and alkynes - along with their air and moisture stability, has established them as an important target for asymmetric synthesis. Efforts towards the stereoselective synthesis of secondary and tertiary alkyl boronic esters have spanned over five decades and are underpinned by a wealth of reactivity platforms, drawing on the unique and varied reactivity of boron...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28525272/direct-synthesis-of-an-unprecedented-stable-radical-of-nickel-ii-3-5-bis-dimedonyl-azadiisoindomethene-with-strong-and-narrow-near-infrared-absorption-at-%C3%AE-%C3%A2-1000-nm
#8
Elena A Makarova, Yuriy V Zatsikha, Kelly M E Newman, Vinod K Paidi, Valeria A Beletsky, Johan van Lierop, Evgeny A Lukyanets, Victor N Nemykin
An unprecedented stable neutral radical nickel(II) complex of 3,5-bis(dimedonyl)azadiisoindomethene (1) was prepared by the direct reaction between 1,3-diiminoisoindoline and dimedone. A new radical complex 1 has an intense and narrow absorption at 1008 nm and can be reduced to a less stable anionic [1](-) with a typical aza(dibenzo)boron dipyrromethene (aza-BODIPY) UV-vis spectrum. Complex 1, along with two other colored condensation reaction products 2 and 3, was characterized by spectroscopy and X-ray crystallography, while the paramagnetic nature of 1 was probed by EPR and SQUID methods...
May 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28524451/tris-perfluorotolyl-borane-a-boron-lewis-superacid
#9
Norbert Werner Mitzel, Jan Schwabedissen, Leif Körte, Marcel Soffner, Sebastian Blomeyer, Christian Reuter, Yury Vishnevskiy, Beate Neumann, Georg Stammler
Tris(tetrafluoro-4-(trifluoromethyl)phenyl)borane (BTolF) was prepared by reacting boron tribromide with tetrameric F3CC6F4-Cu(I). The latter was generated from F3CC6F4MgBr and copper(I) bromide. Lewis acidities of BTolF evaluated by the Gutmann-Beckett method and calculated fluoride ion affinities are 9 and 10%, respecttively, higher than that of tris(penta-fluorophenyl)borane (BCF) and even higher than that of SbF5. The molecular structures of BTolF and BCF were determined by gas electron diffraction, that of BTolF also by single crystal X-ray diffraction...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523720/tuning-of-the-optical-electronic-and-magnetic-properties-of-boron-nitride-nanosheets-with-oxygen-doping-and-functionalization
#10
Qunhong Weng, Dmitry G Kvashnin, Xi Wang, Ovidiu Cretu, Yijun Yang, Min Zhou, Chao Zhang, Dai-Ming Tang, Pavel B Sorokin, Yoshio Bando, Dmitri Golberg
Engineering of the optical, electronic, and magnetic properties of hexagonal boron nitride (h-BN) nanomaterials via oxygen doping and functionalization has been envisaged in theory. However, it is still unclear as to what extent these properties can be altered using such methodology because of the lack of significant experimental progress and systematic theoretical investigations. Therefore, here, comprehensive theoretical predictions verified by solid experimental confirmations are provided, which unambiguously answer this long-standing question...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28521158/degradation-of-creatinine-using-boron-doped-diamond-electrode-statistical-modeling-and-degradation-mechanism
#11
Zhefeng Zhang, Jiahui Xian, Chunyong Zhang, Degang Fu
This study investigated the degradation performance and mechanism of creatinine (a urine metabolite) with boron-doped diamond (BDD) anodes. Experiments were performed using a synthetic creatinine solution containing two supporting electrolytes (NaCl and Na2SO4). A three-level central composite design was adopted to optimize the degradation process, a mathematical model was thus constructed and used to explore the optimum operating conditions. A maximum mineralization percentage of 80% following with full creatinine removal had been achieved within 120 min of electrolysis, confirming the strong oxidation capability of BDD anodes...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28521117/neutron-spectral-fluence-measurements-using-a-bonner-sphere-spectrometer-in-the-development-of-the-ibnct-accelerator-based-neutron-source
#12
Akihiko Masuda, Tetsuro Matsumoto, Kenta Takada, Takahiro Onishi, Kohei Kotaki, Hidenori Sugimoto, Hiroaki Kumada, Hideki Harano, Takeji Sakae
The neutron spectral fluence of an accelerator-based neutron source facility for boron neutron capture therapy (BNCT) based on a proton linac and a beryllium target was evaluated by the unfolding method using a Bonner sphere spectrometer (BSS). A (3)He-proportional-counter-based BSS was used with weak beam during the development of the facility. The measured epithermal neutron spectra were consistent with calculations. The epithermal neutron intensity at the beam port was estimated and the results gave a numerical target for the enhancement of the proton beam intensity and will be used as reference data for measurements performed after the completion of the facility...
May 10, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28521091/non-magnetic-quantum-emitters-in-boron-nitride-with-ultra-narrow-and-sideband-free-emission-spectra
#13
Xiangzhi Li, Gabriella Donna Shepard, Andrew Cupo, Nicolas Camporeale, Kamran Shayan, Yue Luo, Vincent Meunier, Stefan Strauf
Hexagonal boron nitride (hBN) is an emerging material in nanophotonics and an attractive host for color centers for quantum photonic devices. Here we show that optical emission from individual quantum emitters in hBN is spatially correlated with structural defects and can display ultra-narrow zero-phonon linewidth down to 45 μeV if spectral diffusion is effectively eliminated by proper surface passivation. We demonstrate that undesired emission into phonon sidebands is largely absent for this type of emitter...
May 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28520398/multiple-states-of-nitrile-hydratase-from-rhodococcus-equi-tg328-2-structural-and-mechanistic-insights-from-epr-and-dft-studies
#14
Natalia Stein, Natalie Gumataotao, Natalia Hajnas, Rui Wu, K P Wasantha Lankathilaka, Uwe T Bornscheuer, Dali Liu, Adam T Fiedler, Richard C Holz, Brian Bennett
Iron-type nitrile hydratases (NHases) contain an Fe(III) ion coordinated in a characteristic "claw setting" by an axial cysteine thiolate; two equatorial peptide nitrogens; the sulfur atoms of equatorial cysteine-sulfenic and cysteine-sulfinic acids, respectively; and an axial water/hydroxyl moiety. The cysteine-sulfenic acid is susceptible to oxidation and the enzyme is traditionally prepared using butyric acid as an oxidative protectant. The as-prepared enzyme exhibits a complex EPR spectrum due to multiple low-spin (S = 1/2) Fe(III) species...
May 18, 2017: Biochemistry
https://www.readbyqxmd.com/read/28517939/breakdown-of-optical-phonons-splitting-in-two-dimensional-materials
#15
Thibault Daniel Pierre Sohier, Marco Gibertini, Matteo Calandra, Francesco Mauri, Nicola Marzari
We investigate the long-wavelength dispersion of longitudinal and transverse optical phonon modes in polar two-dimensional materials, multilayers, and their heterostructures. Using analytical models and density-functional perturbation theory in a two-dimensional framework, we show that, at variance with the three-dimensional case, these modes are degenerate at the zone center but the macroscopic electric field associated with the longitudinal-optical modes gives rise to a finite slope at the zone center in their corresponding phonon dispersions...
May 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28516773/amphiphilic-bodipy-hydroporphyrin-energy-transfer-arrays-with-broadly-tunable-absorption-and-deep-red-near-infrared-emission-in-aqueous-micelles
#16
Adam Meares, Andrius Satraitis, Joshua Akhigbe, Nithya Santhanam, Subramani Swaminathan, Melanie Ehudin, Marcin Ptaszek
BODIPY-hydroporphyrin energy transfer arrays allow for development of family of fluorophores featuring a common excitation band at 500 nm, tunable excitation band in deep red/near-infrared window, and tunable emission. Their biomedical applications are contingent upon retaining their optical properties in aqueous environment. Amphiphilic arrays containing PEG-substituted BODIPY and chlorins or bacteriochlorins were prepared and their optical and fluorescence properties were determined in organic solvents and aqueous surfactants...
May 18, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28516304/strategy-for-designing-stable-and-powerful-nitrogen-rich-high-energy-materials-by-introducing-boron-atoms
#17
Wen-Jie Wu, Wei-Jie Chi, Quan-Song Li, Ze-Sheng Li
One of the most important aims in the development of high-energy materials is to improve their stability and thus ensure that they are safe to manufacture and transport. In this work, we theoretically investigated open-chain N4B2 isomers using density functional theory in order to find the best way of stabilizing nitrogen-rich molecules. The results show that the boron atoms in these isomers are aligned linearly with their neighboring atoms, which facilitates close packing in the crystals of these materials...
June 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28514703/bacterial-infections-and-hepatic-encephalopathy-in-liver-cirrhosis-prophylaxis-and-treatment
#18
REVIEW
Damian Piotrowski, Anna Boroń-Kaczmarska
Infections are common among patients with liver cirrhosis. They occur more often in cirrhotic patient groups than in the general population and result in higher mortality. One reason for this phenomenon is bacterial translocation from the intestinal lumen that occurs as a consequence of intestinal bacterial overgrowth, increased permeability and decreased motility. The most common infections in cirrhotic patients are spontaneous bacterial peritonitis and urinary tract infections, followed by pneumonia, skin and soft tissue infections...
May 14, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28513655/boron-difluoride-hemicurcuminoid-as-an-efficient-far-red-to-near-infrared-emitter-toward-oleds-and-laser-dyes
#19
A D'Aléo, M H Sazzad, D H Kim, E Y Choi, J W Wu, G Canard, F Fages, J-C Ribierre, C Adachi
A hemicurcuminoid boron difluoride complex is used as an emitter in organic light-emitting diodes, showing far red/near-infrared electroluminescence with an external quantum efficiency as high as 2.1%. This dye blended in CBP thin films shows amplified spontaneous emission with a threshold of 22 μJ cm(-2) at 750 nm, making this compound attractive for organic semiconductor lasers operating in the near-infrared region.
May 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28513581/tailoring-spin-defects-in-diamond-by-lattice-charging
#20
Felipe Fávaro de Oliveira, Denis Antonov, Ya Wang, Philipp Neumann, Seyed Ali Momenzadeh, Timo Häußermann, Alberto Pasquarelli, Andrej Denisenko, Jörg Wrachtrup
Atomic-size spin defects in solids are unique quantum systems. Most applications require nanometre positioning accuracy, which is typically achieved by low-energy ion implantation. A drawback of this technique is the significant residual lattice damage, which degrades the performance of spins in quantum applications. Here we show that the charge state of implantation-induced defects drastically influences the formation of lattice defects during thermal annealing. Charging of vacancies at, for example, nitrogen implantation sites suppresses the formation of vacancy complexes, resulting in tenfold-improved spin coherence times and twofold-improved formation yield of nitrogen-vacancy centres in diamond...
May 17, 2017: Nature Communications
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