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A Zheleva, G Nikolova, Y Karamalakova, E Hristakieva, R Lavcheva, V Gadjeva
Currently accepted that oxidative stress is a triggering event in the melanocytic destruction and is probably involved in the etiopathogenesis of vitiligo disease. Despite numerous investigations, contradictory results were reported about the levels of oxidative stress biomarkers measured in the skin and blood of vitiligo patients. By Electron Paramagnetic Resonance spectroscopy (EPR) and spectrophotometry, we have investigated and compared some oxidative stress biomarkers in the blood of vitiligo patients' before and after UVB Narrow Band 311 nm phototherapy combined with the antioxidant nutritional supplement containing - Vitamin C, Vitamin B1, L -Cysteine, Lipoic Acid, and polyunsaturated fatty acids...
February 14, 2018: Regulatory Toxicology and Pharmacology: RTP
Rola Abboud, Catherine Charcosset, Hélène Greige-Gerges
Human steroid hormones are involved in many aspects of physiology and have long been known to exert rapid and delayed effects. They are lipophilic molecules which can be incorporated into the lipid membranes. Through non-covalent interactions they can alter the properties of the membrane, including fluidity, lipid raft formation and others. In this review, different biophysical techniques were described to study the interaction of human steroid hormones with biological and biomimetic membranes such as differential scanning calorimetry, electron paramagnetic resonance, fluorescence spectroscopy and Fourier transform infrared spectroscopy...
February 13, 2018: Biochimie
Christoph Centner, Denise Zdzieblik, Patrick Dressler, Bruno Fink, Albert Gollhofer, Daniel König
The main purpose of this study was to investigate the acute local and systemic effects of low-load resistance exercise (30% 1RM) with partial vascular occlusion on exercise-induced free radical production and to compare these effects with other established training methods. Fifteen young and healthy males (25 ± 3 years) performed the following four sessions in a counterbalanced order on separate days: low-load resistance exercise (LI: 30% 1RM), low-load resistance exercise with blood flow restriction (LIBR: 30% 1RM), high-load resistance exercise (HI: 80% 1RM) and an additional session without exercise but blood flow restriction only (BR)...
February 16, 2018: Free Radical Research
Nino Wili, Gunnar Jeschke
A new ultra-wide band (UWB) pulse EPR method is introduced for observing all nuclear frequencies of a paramagnetic center in a single shot. It is based on burning spectral holes with a high turning angle (HTA) pulse that excites forbidden transitions and subsequent detection of the hole pattern by a chirp echo. We term this method Chirp Echo Epr SpectroscopY (CHEESY)-detected NMR. The approach is a revival of FT EPR-detected NMR. It yields similar spectra and the same type of information as electron-electron double resonance (ELDOR)-detected NMR, but with a multiplex advantage...
February 6, 2018: Journal of Magnetic Resonance
Hiroki Fukunaga, Masanori Tonouchi, Kouji Taniguchi, Wataru Kosaka, Shojiro Kimura, Hitoshi Miyasaka
Magnetic phase switching in a coordination polymer is reported, which is demonstrated by combining two processes: (A) the pre-organization of magnetic/redox-active molecules into a framework, and (B) a post-treatment through electrochemical tuning of the pre-organized molecules. A TTF .+ -TCNQ .- salt (TTF=tetrathiafulvalene; TCNQ=7,7,8,8-tetracyano-p-quinodimethane) was incorporated into a three-dimensional framework with paddlewheel-type dimetal(II, II) units ([M 2 II,II ]; M=Ru with S=1, 1; and Rh with S=0, 2), where the [M 2 II,II ] and TCNQ ...
February 15, 2018: Chemistry: a European Journal
Andrea Bortot, Serena Zanzoni, Mariapina D'Onofrio, Michael Assfalg
In biological milieus, nanoparticles (NPs) elicit bioactivity upon interaction with proteins. As a result of post-translational modification, proteins occur in a variety of alternative covalent forms, including structural isomers, which present unique molecular surfaces. We aimed at a detailed description of the recognition of protein isomeric species by NP surfaces. The transient adsorption of isomeric Ub dimers to NPs was investigated by solution NMR spectroscopy. Lys63-linked Ub2 and Lys48-linked Ub2 adsorbed to large anionic NPs with different affinity, while the binding strength was similar in the case of smaller particles...
February 15, 2018: Chemistry: a European Journal
Abdel Rahman Abdel Fattah, Sarah Mishriki, Tobias Kammann, Rakesh P Sahu, Fei Geng, Ishwar K Puri
A magnet array is employed to manipulate diamagnetic cells that are contained in paramagnetic medium to demonstrate for the first time the contactless bioprinting of three-dimensional (3D) cellular structures and co-cultures of breast cancer MCF-7 and endothelial HUVEC at prescribed locations on tissue culture treated well plates. Sequential seeding of different cell lines and the spatial displacement of the magnet array creates co-cultured cellular structures within a well without using physically intrusive well inserts...
February 15, 2018: Biomaterials Science
Fernando Menegatti de Melo, Sabrina da Nobrega Almeida, Noemi Saori Uezu, Carlos Alberto Ospina Ramirez, Antonio Domingues Dos Santos, Henrique Eisi Toma
The extraction of dysprosium (Dy3+) ions from aqueous solution was carried out successfully, using magnetite (Fe3O4) nanoparticles functionalized with diethylenetriaminepentaacetic acid (MagNP@DTPA). The process was monitored by energy dispersive X-ray fluorescence spectroscopy, as a function of concentration, proceeding according to a Langmuir isotherm with an equilibrium constant of 2.57 × 10-3 g(MagNP) L-1 and a saturation limit of 63.2 mgDy/gMagNP. The presence of paramagnetic Dy3+ ions attached to the superparamagnetic nanoparticles led to an overall decrease of magnetization...
June 1, 2018: Journal of Nanoscience and Nanotechnology
T Stauber, T Low, G Gómez-Santos
We present an effective (minimal) theory for chiral two-dimensional materials. These materials possess an electromagnetic coupling without exhibiting a topological gap. As an example, we study the response of doped twisted bilayers, unveiling unusual phenomena in the zero frequency limit. An in-plane magnetic field induces a huge paramagnetic response at the neutrality point and, upon doping, also gives rise to a substantial longitudinal Hall response. The system also accommodates nontrivial longitudinal plasmonic modes that are associated with a longitudinal magnetic moment, thus endowing them with a chiral character...
January 26, 2018: Physical Review Letters
Katerina I Aleksieva, Nicola D Yordanov
Irradiation of food in the world is becoming a preferred method for their sterilization and extending their shelf life. For the purpose of trade with regard to the rights of consumers is necessary marking of irradiated foodstuffs, and the use of appropriate methods for unambiguous identification of radiation treatment. One-third of the current standards of the European Union to identify irradiated foods use the method of the Electron Paramagnetic Resonance (EPR) spectroscopy. On the other hand the current standards for irradiated foods of plant origin have some weaknesses that led to the development of new methodologies for the identification of irradiated food...
March 2018: Food Research International
Chongyun Shao, Jinjun Ren, Fan Wang, Nadege Ollier, Fenghou Xie, Xuyang Zhang, Lei Zhang, Chunlei Yu, Lili Hu
Yb3+/Al3+/P5+ co-doped silica glasses with different P/Al ratios were prepared using the sol-gel method combined with high-temperature sintering. The evolution of composition-dependent color centers caused by X-ray irradiation in these glasses were correlated with their structural changes, which is controlled by the P/Al ratio. Nuclear magnetic resonance (NMR) and Raman spectra have been used to characterize the glass network structure, and advanced pulse electron paramagnetic resonance (EPR) has been employed to study the local coordination atom structures of Yb3+ ions in pristine glasses as a function of P/Al radio...
February 12, 2018: Journal of Physical Chemistry. B
Pierric Lemoine, Anne Vernière, Mathieu Pasturel, Gérard Venturini, Bernard Malaman
Previous experimental and theoretical studies revealed that carbon insertion into the RCr2Si2 compounds drastically affects the magnetic behavior, since chromium does not carry any magnetic moment in RCr2Si2C (R = Y, La-Sm, Gd-Er) compounds in contrast to RCr2Si2 (R = Y, Sm, Gd-Lu, Th) compounds. In this study, we report on the unexpected magnetic ordering of chromium atoms in the isotype quaternary UCr2Si2C compound. While specific heat and magnetic measurements suggest a Pauli paramagnetic behavior, neutron powder diffraction reveals an antiferromagnetic ordering of the chromium substructure at high temperature (TN > 300 K), while that of uranium remains nonmagnetically ordered down to 2 K...
February 12, 2018: Inorganic Chemistry
Ankit Kumar, Amit Jash, Amarish Dubey, Alok Bajpai, Deepu Philip, Kalpana Bhargava, Sushil K Singh, Mainak Das, S S Banerjee
Recent studies showed that silk and human hair fibers develop thermoelectric properties at optimal water, temperature and light conditions. The nature of charge carriers and the role of water in mediating charge conduction in these fibers is an unexplored issue. By studying four different classes of natural fibers, viz., silk cocoon, human hair, jute and corn silk, we uncover their common electrical transport properties and its dependence on water concentration and temperature. All these fibers uniformly exhibit nonlinear, hysteretic current - voltage characteristics, which scale with water concentration...
February 9, 2018: Scientific Reports
Ying Zhang, Fengxiang Han, Qilin Dai, Jinke Tang
A simple and large-scale synthetic method of Mn doped ZnO (ZnO:Mn) was developed in this work. ZnO:Mn nanocrystals with hexagonal structure were prepared by thermal decomposition of zinc acetate and manganese acetate in the presence of oleylamine and oleic acid with different temperatures, ligand ratios, and Mn doping concentrations. The particle size (47-375 nm) and morphology (hexagonal nanopyramid, hexagonal nanodisk and irregular nanospheres) of ZnO:Mn nanocrystals can be controlled by the ratio of capping ligand, reaction temperature, reaction time and Mn doping concentration...
February 2, 2018: Journal of Colloid and Interface Science
Weitao Yang, Xiaoli Wu, Yan Dou, Jin Chang, Chenyang Xiang, Jiani Yu, Jun Wang, Xiuli Wang, Bingbo Zhang
Protein-mediated biomimetic nanoparticles because of simplicity of their synthesis, subdued nonspecific adsorption, improved pharmacokinetics, and biocompatibility have been receiving increasing attention recently. Nevertheless, only a handful of proteins have been developed for biomimetic synthesis. Worse still, most of them are constrained on single-function usages in chemistry. Exploring new functional proteins, especially those with multi-dentate moieties for multi-role biomimetic chemistry, still remains a substantial challenge...
February 3, 2018: Biomaterials
Huanyao Gao, Tamanna Azam, Sajini Randeniya, Jérémy Couturier, Nicolas Rouhier, Michael K Johnson
Dihydroxyacid dehydratase (DHAD) is the third enzyme required for branched-chain amino acid biosynthesis in bacteria, fungi, and plants. DHAD enzymes contain two distinct types of active-site Fe-S clusters. The best characterized examples are Escherichia coli DHAD, which contains an oxygen-labile [Fe4S4] cluster, and spinach DHAD, which contains an oxygen-resistant [Fe2S2] cluster. Although the Fe-S cluster is crucial for DHAD function, little is known about the cluster-coordination environment or the mechanism of catalysis and cluster biogenesis...
February 7, 2018: Journal of Biological Chemistry
Barbara Bednarczyk-Cwynar, Piotr Ruszkowski, Tomasz Jarosz, Katarzyna Krukiewicz
AIM: Triterpenes are natural compounds, whose wide biological activity predestines them for application as promising new chemotherapeutics. In this paper, we report the results of our investigations into the substitution of oleanolic acid with aromatic and nitroaromatic moieties acting as bioreducing agents. RESULTS: The process of reduction of nitro groups was investigated through cyclic voltammetry, UV-Vis and electron paramagnetic resonance spectroelectrochemistry...
February 9, 2018: Future Medicinal Chemistry
Yasukazu Hirao, Nobuhiro Nagamachi, Katsuma Hosoi, Takashi Kubo
The twisted form of bianthrone is known as a metastable state provided by a photo-induced or thermal-induced isomerization of the folded form, and thus prevents the isolation and the detailed analysis of its electronic structure. In this study, an unsymmetrical bianthrone (2), consisting of the electron-withdrawing anthrone and electron-donating acridane, have been synthesized and shown to exhibit a solvent-polarity-dependent isomerization reaction between the folded and twisted isomers. With increasing the polarity of the solvent, 2 showed an isomerization reaction from the folded form to the twisted form...
February 9, 2018: Chemistry, An Asian Journal
Viktoria K Muravieva, Yakov M Gayfulin, Maxim R Ryzhikov, Igor N Novozhilov, Denis G Samsonenko, Dmitry A Piryazev, Vadim V Yanshole, Nikolay G Naumov
Cluster compounds based on a new {Re3Mo3Se8}n core were obtained and studied. The polymeric solid K6[Re3Mo3Se8(CN)4(CN)2/2] (1) containing 24 cluster valence electrons (CVE) was isolated as a result of high-temperature reaction. Water-soluble salts K5[Re3Mo3Se8(CN)6]·11H2O (2) and Cs5[Re3Mo3Se8(CN)6]·H2O (3) were prepared from compound 1. Crystal structures of the diamagnetic compounds 2 and 3 contain a cluster anion [Re3Mo3Se8(CN)6]5- with a 22-electronic core {Re3Mo3Se8}+. Metathesis reaction followed by recrystallization from CH3CN yielded paramagnetic salt (Ph4P)4[Re3Mo3Se8(CN)6]·2CH3CN (4) containing the {Re3Mo3Se8}2+ core with 21 CVE...
February 9, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Iuliia P Novoselova, Andrejs Petruhins, Ulf Wiedwald, Árni Sigurdur Ingason, Thomas Hase, Fridrik Magnus, Vassilios Kapaklis, Justinas Palisaitis, Marina Spasova, Michael Farle, Johanna Rosen, Ruslan Salikhov
In 2013, a new class of inherently nanolaminated magnetic materials, the so called magnetic MAX phases, was discovered. Following predictive material stability calculations, the hexagonal Mn2GaC compound was synthesized as hetero-epitaxial films containing Mn as the exclusive M-element. Recent theoretical and experimental studies suggested a high magnetic ordering temperature and non-collinear antiferromagnetic (AFM) spin states as a result of competitive ferromagnetic and antiferromagnetic exchange interactions...
February 8, 2018: Scientific Reports
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