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https://www.readbyqxmd.com/read/28735222/effect-of-oleic-acid-on-the-properties-of-protein-adsorbed-layers-at-water-oil-interfaces-an-epr-study-combined-with-dynamic-interfacial-tension-measurements
#1
Eleni P Kalogianni, Leandros Sklaviadis, Stella Nika, Ioanna Theochari, Georgia Dimitreli, Despoina Georgiou, Vassiliki Papadimitriou
Multiphase food systems consist of complex interfacial layers where surface active molecules complete compete for adsorption and interact with one another affecting the interfacial properties and the behavior of the food systems involved. The present work focuses on the examination of interactions between proteins playing an which play an important role in milk-rich food systems (namely κ-casein and β-lactoglobulin) and oleic acid (an anionic surfactant abundant in food systems) at the oil/water interface...
July 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28735108/structural-biology-outside-the-box-inside-the-cell
#2
REVIEW
Jürgen M Plitzko, Benjamin Schuler, Philipp Selenko
Recent developments in cellular cryo-electron tomography, in-cell single-molecule Förster resonance energy transfer-spectroscopy, nuclear magnetic resonance-spectroscopy and electron paramagnetic resonance-spectroscopy delivered unprecedented insights into the inner workings of cells. Here, we review complementary aspects of these methods and provide an outlook toward joint applications in the future.
July 20, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28734212/treatment-of-refractory-contaminants-by-sludge-derived-biochar-persulfate-system-via-both-adsorption-and-advanced-oxidation-process
#3
Jia Wang, Zhuwei Liao, Jerosha Ifthikar, Lerong Shi, Yunan Du, Jingyi Zhu, Shuang Xi, Zhuqi Chen, Zhulei Chen
A novel strategy for the removal of refractory organic contaminants was realized through sludge-derived biochar (SDBC)/persulfate (PS) system via both adsorption and advanced oxidation process under ambient conditions. SDBC was prepared by one single step of slow pyrolysis of municipal sewage sludge, appeared a porous structure, and contained abundant oxygen-containing functional groups as well as amorphous Fe species. Large surface area and porous structure of SDBC benefitted the adsorption and enrichment of contaminants, while oxygen-containing functional groups and Fe species on the surface were considered as reactive components for the activation of PS...
July 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28733612/photoluminescence-associated-with-the-site-occupations-of-ho-3-ions-in-batio3
#4
Da-Yong Lu, Dong-Xue Guan
A nominal (Ba1-x Ho x )Ti1-x/4O3 (x = 0.01) (BHTH) ceramic with a single-phase tetragonal structure was prepared at 1400 °C using the solid-state reaction method. The analysis on the defect chemistry revealed that the real formula of BHTH is (Ba1-x Ho3x/4)(Ti1-x/4Ho x/4)O3 with Ba vacancies via electron paramagnetic resonance (EPR). Photoluminescence (PL) was investigated on the basis of excitation with different wavelength lasers. The results indicated that under 488-nm excitation, PL and Raman scattering can occur simultaneously as two distinct optical processes for BHTH ceramic powders, and the strongest PL band at 564 nm was discovered and verified to originate from the (5)G6/(5)F1 → (5)I7 transition of Ho(3+) ions on the Ti sites in the BaTiO3 lattice...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733597/design-of-new-mott-multiferroics-via-complete-charge-transfer-promising-candidates-for-bulk-photovoltaics
#5
Hanghui Chen, Andrew Millis
Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation. Ferroelectric perovskite oxides such as BaTiO3 and PbTiO3 exhibit substantial polarization and stability, but have the disadvantage of excessively large band gaps. We use both density functional theory and dynamical mean field theory calculations to design a new class of Mott multiferroics-double perovskite oxides A 2VFeO6 (A = Ba, Pb, etc). While neither perovskite AVO3 nor AFeO3 is ferroelectric, in the double perovskite A 2VFeO6 a 'complete' charge transfer from V to Fe leads to a non-bulk-like charge configuration-an empty V-d shell and a half-filled Fe-d shell, giving rise to a polarization comparable to that of ferroelectric ATiO3...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28731747/tuning-paramagnetic-spin-excitations-of-single-adatoms
#6
Julen Ibañez-Azpiroz, Manuel Dos Santos Dias, Benedikt Schweflinghaus, Stefan Blügel, Samir Lounis
We predict the existence of paramagnetic spin excitations (PSE) in nonmagnetic single adatoms. Our calculations demonstrate that PSE develop a well-defined structure in the meV region when the adatom's Stoner criterion for magnetism is close to the critical point. We further reveal a subtle tunability and enhancement of PSE by external magnetic fields. Finally, we show how PSE can be detected as moving steps in the dI/dV signal of inelastic scanning tunneling spectroscopy, opening a potential route for experimentally accessing electronic properties of nonmagnetic adatoms, such as the Stoner parameter...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731076/simple-gd-3-neu5nac-complexation-results-in-nmr-chemical-shift-asymmetries-of-structurally-equivalent-complex-type-n-glycan-branches
#7
Konstantin Usachev, Yoshiki Yamaguchi, Masayuki Takamatsu, Nataliya Pavlova, Vladimir Klochkov, Almira Kurbangalieva, Takefumi Murase, Taiji Shimoda, Katsunori Tanaka
In the present Communication, we propose a quite simple but previously overlooked approach for conveniently analyzing, assigning, and extracting sialic acid-containing N-glycan structures using high-resolution NMR spectroscopy without pre-installing metal chelators. Paramagnetic metals, such as Gd(3+), appear to bind to the carboxyl groups of N-acetylneuraminic acid when introduced at room temperature, leading to the measurement of nonequivalent proton and carbon NMR spectral signals among otherwise "identical" glycan branched structures...
July 21, 2017: Analyst
https://www.readbyqxmd.com/read/28730213/magnetic-separation-its-application-in-mining-waste-purification-medicine-biochemistry-and-chemistry
#8
REVIEW
M Iranmanesh, J Hulliger
The use of strong magnetic field gradients and high magnetic fields generated by permanent magnets or superconducting coils has found applications in many fields such as mining, solid state chemistry, biochemistry and medical research. Lab scale or industrial implementations involve separation of macro- and nanoparticles, cells, proteins, and macromolecules down to small molecules and ions. Most promising are those attempts where the object to be separated is attached to a strong magnetic nanoparticle. Here, all kinds of specific affinity interactions are used to attach magnetic carrier particles to mainly objects of biological interest...
July 21, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28730196/photosensitization-mechanism-of-cu-ii-porphyrins
#9
Jon Uranga, Jon M Matxain, Xabier Lopez, Jesus M Ugalde, David Casanova
This work presents the mechanism of the photoinduced generation of reactive oxygen species (ROS) by paramagnetic copper porphyrins in aqueous solution. Electronic structure calculations within the framework of the (time-dependent) density functional theory, (TD)DFT, reveal the details regarding the development of the atomistic and electronic structures of the copper porphyrin in solution along the set of chemical reactions accessible upon photoactivation. This study identifies the key parameters controlling the feasibility of the various reaction pathways that drive the formation of specific reactive oxygen species, ROS, i...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28729718/magnetic-activated-atp-fe3o4-nanocomposite-as-an-efficient-fenton-like-heterogeneous-catalyst-for-degradation-of-ethidium-bromide
#10
Shuwen Han, Hemin Yu, Tingting Yang, Shengsen Wang, Xiaozhi Wang
Magnetic attapulgite-Fe3O4 nanocomposites (ATP-Fe3O4) were prepared by coprecipitation of Fe3O4 on ATP. The composites were characterized by scanning electron microscopey, X-ray diffractometry, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectroscopy, energy dispersive spectrometer and transmission electron microscopy. Surface characterization showed that Fe3O4 particles with an average size of approximately 15 nm were successfully embedded in matrix of ATP. The capacity of the Fe3O4-activated ATP (A-ATP@Fe3O4) composites for catalytic degradation of ethidium bromide (EtBr, 80 mg/L) at different pH values, hydrogen peroxide (H2O2) concentrations, temperatures, and catalyst dosages was investigated...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727430/renal-clearable-peptide-functionalized-nagdf4-nanodots-for-high-efficiency-tracking-orthotopic-colorectal-tumor-in-mouse
#11
Hongda Chen, Xiaodong Li, Fuyao Liu, Huimao Zhang, Zhenxin Wang
The effective delivery of bioimaging probes to a selected cancerous tissue has extensive significance for biological studies and clinical investigations. Herein, the peptide functionalized NaGdF4 nanodots (termed as, pPeptide-NaGdF4 nanodots) have been prepared for highly efficient magnetic resonance imaging (MRI) of tumor by formation of Gd-phosphonate coordinate bonds among hydrophobic NaGdF4 nanodots (4.2 nm in diameter) with mixed phosphorylated peptide ligands including a tumor targeting phosphopeptide and a cell penetrating phosphopeptide...
July 20, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28726180/epr-characterization-of-dinitrosyl-iron-complexes-with-thiol-containing-ligands-as-an-approach-to-their-identification-in-biological-objects-an-overview
#12
REVIEW
Anatoly F Vanin
The overview demonstrates how the use of only one physico-chemical approach, viz., the electron paramagnetic resonance method, allowed detection and identification of dinitrosyl iron complexes with thiol-containing ligands in various animal and bacterial cells. These complexes are formed in biological objects in the paramagnetic (electron paramagnetic resonance-active) mononuclear and diamagnetic (electron paramagnetic resonance-silent) binuclear forms and control the activity of nitrogen monoxide, one of the most universal regulators of metabolic processes in the organism...
July 19, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28724968/ce-3-ion-surface-oxygen-vacancy-and-visible-light-induced-photocatalytic-dye-degradation-and-photocapacitive-performance-of-ceo2-graphene-nanostructures
#13
Mohammad Ehtisham Khan, Mohammad Mansoob Khan, Moo Hwan Cho
Cerium oxide nanoparticles (CeO2 NPs) were fabricated and grown on graphene sheets using a facile, low cost hydrothermal approach and subsequently characterized using different standard characterization techniques. X-ray photoelectron spectroscopy and electron paramagnetic resonance revealed the changes in surface states, composition, changes in Ce(4+) to Ce(3+) ratio, and other defects. Transmission electron microscopy (TEM) and high resolution TEM revealed that the fabricated CeO2 NPs to be spherical with particle size of ~10-12 nm...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723689/a-randomized-controlled-trial-of-green-tea-beverages-on-the-in-vivo-radical-scavenging-activity-in-human-skin
#14
Inna Megow, Maxim E Darvin, Martina C Meinke, Jürgen Lademann
BACKGROUND: Oxidative stress plays an important role in the pathogenesis of various skin diseases. Thus, the antioxidant network of the skin relies on the uptake of exogenous antioxidants to ensure cell protection against radical formation. Green tea is one of the main sources of polyphenolic antioxidant compounds, but only few data are available on its cutaneous antioxidant effects. METHODS: The radical scavenging properties of Benifuuki and Yabukita green tea were investigated in the human skin...
July 20, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28718469/characterization-of-the-thermal-thermal-oxidative-stability-of-fluorinated-graphene-with-various-structures
#15
Wenchuan Lai, Dazhou Xu, Xu Wang, Zaoming Wang, Yang Liu, Xiaojiao Zhang, Xiangyang Liu
Considering practical applications, the thermal/thermal oxidative stability of fluorinated graphene should be given sufficient attention. Herein, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) were used to investigate in detail the differences in the thermal stabilities of two types of fluorinated samples, fluorinated graphene (FG) and fluorinated porous graphene (FPG) with various fluorine contents, respectively, as well as the reasons for these differences...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28715188/understanding-microscopic-behavior-of-the-mixture-of-ionic-liquid-ethylene-glycol-lithium-salt-through-time-resolved-fluorescence-nuclear-magnetic-resonance-nmr-and-electron-paramagnetic-resonance-epr-studies
#16
Ranu Satish Dhale, Prabhat Kumar Sahu, Moloy Sarkar
The present study has been undertaken with an aim to find out the suitability of a binary solvent system, comprising an ionic liquid, 1-(2-Hydroxyethyl)-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([OHEMIM][NTf2]) and ethylene glycol (EG), towards lithium ion battery applications. For this purpose, the behavior in terms of structure, intermolecular interaction and dynamics of several solvent systems, [OHEMIM][NTf2], [OHEMIM][NTf2]-LiNTf2(lithium bis(trifluoromethylsulfonyl)imide), [OHEMIM][NTf2]-EG and [OHEMIM][NTf2]-EG-LiNTf2 are investigated by carrying out steady state and time-resolved fluorescence, nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) measurements...
July 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28715134/magnetic-shielding-studies-of-c2-and-c2h2-support-higher-than-triple-bond-multiplicity-in-c2
#17
Peter B Karadakov, Josh Kirsopp
The carbon-carbon bonds in the ground states of C2 and C2H2, at their equilibrium geometries, are compared by analysing the changes in the off-nucleus magnetic shielding tensor within the space surrounding each of these molecules. A wide range of quantum-chemical approaches, including full-valence CASSCF-GIAO, CCSD(T)-GIAO and CCSDT-GIAO, all with the cc-pVQZ basis set, as well as HF-GIAO and MP2-GIAO, with the cc-pVQZ, cc-pV5Z and cc-pV6Z basis sets, show that the surroundings of the carbon-carbon bond in C2 are more shielded than those of the carbon-carbon bond in C2H2...
July 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28715026/exchangeable-proton-endor-as-a-probe-of-the-redox-active-iron-center-in-activated-bleomycin-and-ferric-bleomycin
#18
Richard M Burger, Vladimir M Grigoryants, Charles P Scholes
Activated bleomycin (ABLM) is a drug-Fe(iii)-hydroperoxide complex kinetically competent in DNA attack (via H4' abstraction). This intermediate is relatively stable, but its spontaneous conversion to ferric bleomycin (Fe(iii)·BLM) is poorly characterized because no observable intermediate product accumulates. The Fe(iii)·BLM formed cryophotolytically from ABLM and kept at 77 K was remarkably similar by EPR and ENDOR criteria to Fe(iii)·BLM formed from Fe(iii) + BLM solution. The notable ENDOR criteria were the ENDOR frequencies and features of orientation-selected, strongly hyperfine-coupled, exchangeable protons associated with the environs of the iron within <3...
July 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28714679/spectroscopic-study-of-the-reversible-chemical-reduction-and-reoxidation-of-substitutional-cr-ions-in-sr2tio4
#19
Keith A Lehuta, Anubhab Haldar, Dongming Zhou, Kevin R Kittilstved
The solid-state synthesis and controllable speciation of Cr dopants in the layered perovskite Sr2TiO4 is reported. We employed a chemical reduction procedure with NaBH4 at relatively mild temperatures (<450 °C) to impart sensitive control over the relative concentration of Cr(3+) dopants, the charge-state of oxygen-vacancy defects, and presence of Ti(3+) defects in highly reduced Cr-doped Sr2TiO4. The electron paramagnetic resonance (EPR) spectra of the reduced powder samples reveal a 12-fold increase in the Cr(3+) concentration within the axially compressed Ti(4+)-site of the Sr2TiO4 host...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28714510/radical-reactions-of-diamine-bis-phenolate-vanadium-iii-complexes-solid-state-binding-of-o2-to-form-a-vanadium-v-peroxo-complex
#20
Sónia Barroso, Ana M Coelho, Pedro Adão, Maria José Calhorda, Ana M Martins
[VCl3(THF)3] reacted with the sodium salt of a tripodal diamine bisphenolate ligand precursor Na2L2 to give a paramagnetic d(2) complex [V(L2)Cl] (2). The reaction of 2 with oxygen is strongly dependent on the experimental conditions, affording [VO(L2)Cl] (6) or [V(η(2)-O2)(L2)Cl] (7). The formation of 7 involves the direct addition of O2 to V(iii) in the solid state with oxidation to V(v) without significantly disturbing the structure of 2. DFT calculations showed that compound 7 is an intermediate in the formation of 6 from 2...
July 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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