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https://www.readbyqxmd.com/read/27906528/a-new-domain-of-reactivity-for-high-valent-dinuclear-m-%C3%AE-o-2-m-complexes-in-oxidation-reactions
#1
Xenia Engelmann, Shenglai Yao, Erik R Farquhar, Tibor Szilvási, Uwe Kuhlmann, Peter Hildebrandt, Matthias Driess, Kallol Ray
The strikingly different reactivity of a series of homo- and heterodinuclear [(M(III) )(μ-O)2 (M(III) )'](2+) (M=Ni; M'=Fe, Co, Ni and M=M'=Co) complexes with β-diketiminate ligands in electrophilic and nucleophilic oxidation reactions is reported, and can be correlated to the spectroscopic features of the [(M(III) )(μ-O)2 (M(III) )'](2+) core. In particular, the unprecedented nucleophilic reactivity of the symmetric [Ni(III) (μ-O)2 Ni(III) ](2+) complex and the decay of the asymmetric [Ni(III) (μ-O)2 Co(III) ](2+) core through aromatic hydroxylation reactions represent a new domain for high-valent bis(μ-oxido)dimetal reactivity...
December 1, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27906521/modeling-the-human-scarred-heart-in-vitro-toward-new-tissue-engineered-models
#2
Janine C Deddens, Amir Hossein Sadeghi, Jesper Hjortnaes, Linda W van Laake, Marc Buijsrogge, Pieter A Doevendans, Ali Khademhosseini, Joost P G Sluijter
Cardiac remodeling is critical for effective tissue healing, however, excessive production and deposition of extracellular matrix components contribute to scarring and failing of the heart. Despite the fact that novel therapies have emerged, there are still no lifelong solutions for this problem. An urgent need exists to improve the understanding of adverse cardiac remodeling in order to develop new therapeutic interventions that will prevent, reverse, or regenerate the fibrotic changes in the failing heart...
December 1, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27906513/smartphone-based-portable-wireless-optical-system-for-the-detection-of-target-analytes
#3
Shreedhar Gautam, Bhagwan S Batule, Hyo Yong Kim, Ki Soo Park, Hyun Gyu Park
Rapid and accurate on-site wireless measurement of hazardous molecules or biomarkers is one of the biggest challenges in nanobiotechnology. We herein describe a novel smartphone-based Portable and Wireless Optical System (PAWS) for rapid, quantitative, and on-site analysis of target analytes. As a proof-of-concept, we employed gold nanoparticles (GNP) and an enzyme, horse radish peroxidase (HRP), to generate colorimetric signals in response to two model target molecules, melamine and hydrogen peroxide, respectively...
December 1, 2016: Biotechnology Journal
https://www.readbyqxmd.com/read/27906500/phylogenetic-studies-gene-cluster-analysis-and-enzymatic-reaction-support-anthrahydroquinone-reduction-as-the-physiological-function-of-fungal-17%C3%AE-hydroxysteroid-dehydrogenase
#4
Leon Fürtges, David Conradt, Michael A Schätzle, Shailesh Kumar Singh, Nada Kraševec, Tea Lanišnik Rižner, Michael Müller, Syed Masood Husain
17β-Hydroxysteroid dehydrogenase (17β-HSDcl) from the filamentous fungus Curvularia lunata (teleomorph Cochliobolus lunatus) catalyzes NADP(H)-dependent oxidoreductions of androgens and estrogens. Despite detailed biochemical and structural characterization of 17β-HSDcl, its physiological function remains unknown. On the basis of amino acid sequence alignment, phylogenetic studies, and the recent identification of the physiological substrates of the homologous MdpC from Aspergillus nidulans and AflM from Aspergillus parasiticus, we propose an anthrahydroquinone as the physiological substrate of 17β-HSDcl...
December 1, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27906491/influence-of-alcohol-%C3%AE-fluorination-on-hydrogen-bond-acidity-of-conformationally-flexible-substrates
#5
Jerome Graton, Guillaume Compain, François Besseau, Elena Bogdan, Joe Watts, Lewis Mtashobya, Zhong Wang, Alex Weymouth-Wilson, Nicolas Galland, Jean-Yves Le Questel, Bruno Linclau
Rational modulations of molecular interactions are of significant importance in compound properties optimization. We have previously shown that fluorination of conformationally rigid cyclohexanols leads to attenuation of their hydrogen-bond (H-bond) donating capacity (pKAHY) when OH***F intramolecular hydrogen-bond (IMHB) interactions occur, as opposed to an increase in pKAHY due to the fluorine electronegativity. This work has now been extended to a wider range of aliphatic β-fluorohydrins with increasing degrees of conformational flexibility...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906486/the-fractional-occupation-number-weighted-density-as-a-versatile-analysis-tool-for-molecules-with-a-complicated-electronic-structure
#6
Christoph Alexander Bauer, Andreas Hansen, Stefan Grimme
The fractional occupation number weighted density (FOD) analysis is explored as a general theoretical diagnostic for complicated electronic structures. Its main feature is to provide robustly and fast the information where 'hot' (strongly correlated and chemically active) electrons are localized in a molecule. We demonstrate its usage in four different prototypical applications: (i) As a new and fast measure for the biradical character of polycyclic aromatic hydrocarbons, (ii) for the selection of active orbital spaces in multiconfigurational or complete active space self consistent field (MCSCF/CASSCF) treatments, (iii) as a possibility to consistently describe molecular energy landscapes in regions with varying biradical character as exemplified by partial double bond torsions, and (iv) as a powerful visualization method for static electron correlation effects in large biomolecules in connection with an efficient semi-empirical tight-binding molecular orbital scheme...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906484/a-ligand-free-pt3-cluster-catalyses-the-markovnikov-hydrosilylation-of-alkynes-with-up-to-106-turnover-frequencies
#7
Avelino Corma, Antonio Leyva, Miguel Angel Rivero
The Pt-catalysed hydrosilylation of alkynes is the procedure of choice to obtain vinylsilanes, and this is claimed to be the most relevant application of Pt in organic synthesis. More than half a century after its discovery, only -vinylsilanes (anti-Markovnikov addition) are obtained with simple Pt catalysts, while -vinylsilanes (Markovnikov addition) remain elusive compounds. Here we report that Pt3 clusters, in part-per-million (ppm) amounts, catalyse the Markovnikov hydrosilylation of terminal alkynes to give a wide variety of -vinylsilanes in reasonable isolated yields and with turnover frequencies that can reach up to one million per hour...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906419/sch-79797-a-selective-par1-antagonist-protects-against-ischemia-reperfusion-induced-arrhythmias-in-the-rat-hearts
#8
O Y Mohamed, A A Al-Masri, E A El Eter, R Lateef
OBJECTIVE: Thrombin is implicated in the genesis of arrhythmias and activation of thrombin receptors exacerbated ventricular arrhythmias following coronary artery ligation. The present study was designed to investigate the possible protective effect of the protease-activated receptor-1 antagonist, SCH79797 against ischemia and reperfusion arrhythmias in the rat heart. MATERIALS AND METHODS: Healthy male Wistar rats (250-350 g) were anesthetized with urethane. Coronary artery ligation was performed for 5 minutes followed by 10 minutes reperfusion...
November 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27906404/highly-efficient-and-stable-mos2-fets-with-reversible-n-doping-using-a-dehydrated-poly-vinyl-alcohol-coating
#9
César J Lockhart de la Rosa, Amirhasan Nourbakhsh, Markus Heyne, Inge Asselberghs, Cedric Huyghebaert, Iuliana Radu, Marc Heyns, Stefan De Gendt
Despite rapid progress in 2D molybdenum disulfide (MoS2) research in recent years, MoS2 field-effect transistors (FETs) still suffer from a high metal-to-MoS2 contact resistance and low intrinsic mobility, which are major hindrances to their future application. We report an efficient technique to dope thin-film MoS2 FETs using a poly(vinyl-alcohol) (PVA) polymeric coating. This results in a reduction of the contact resistance by up to 30% as well as a reduction in the channel resistance to 20 kΩ sq(-1). Using a dehydration process, we were able to effectively control the surface interactions between MoS2 and the more electropositive hydroxyl groups (-OH) of PVA, which provided a controllable and yet reversible increase in the charge carrier density to a value of 8...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906400/facile-synthesis-and-shape-evolution-of-well-defined-phosphotungstic-acid-potassium-nanocrystals-as-a-highly-efficient-visible-light-driven-photocatalyst
#10
Xinran Li, Huaiguo Xue, Huan Pang
Uniform and hollow rhombic dodecahedral, rhombic dodecahedral, spherical, and semi-hollow K3PW12O40·nH2O nanocrystals are fabricated without any surfactants or templating agents in mild hydrothermal conditions. The shape evolution and growth of these crystals are studied by changing different reaction parameters, such as the reagent, time and temperature. It is found that the temperature and time have significant effects on the possible growth processes of these nanostructures. More importantly, according to photocatalytic results, due to the specific nanostructure-hollow rhombic dodecahedral structure, the hollow rhombic dodecahedral K3PW12O40·nH2O particles with nanopores are shown to be the most effective at activating H2O2, degrading dye pollutants completely after 90 minutes of visible light radiation...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906398/cooperation-and-competition-between-halogen-bonding-and-van-der-waals-forces-in-supramolecular-engineering-at-the-aliphatic-hydrocarbon-graphite-interface-position-and-number-of-bromine-group-effects
#11
Bao Zha, Meiqiu Dong, Xinrui Miao, Shan Peng, Yican Wu, Kai Miao, Yi Hu, Wenli Deng
Herein, the photophysical properties of two π-conjugated thienophenanthrene derivatives (6,9- and 5,10-DBTD) are reported. Their self-assembled monolayers in aliphatic hydrocarbon solvents under different concentrations were investigated by scanning tunneling microscopy on a graphite surface. The STM results revealed that the self-assembled structures of the two geometrical isomers exhibited absolutely different behaviors. At the aliphatic solvent/graphite interface, 6,9-DBTD produced almost a single stable coassembled linear structure, except for that with n-tridecane as the solvent...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906391/large-area-growth-of-vertically-aligned-luminescent-mos2-nanosheets
#12
G Deokar, N S Rajput, P Vancsó, F Ravaux, M Jouiad, D Vignaud, F Cecchet, J-F Colomer
Vertically aligned MoS2 nanosheets (NSs) with exposed edges were successfully synthesized over a large area (∼2 cm(2)). The NSs were grown using an ambient pressure chemical vapor deposition technique via rapid sulfurization of sputter deposited thick molybdenum films. Extensive characterization of the grown MoS2 NSs has been carried out using high resolution scanning and transmission electron microscopy (SEM & TEM). A special care was given to the TEM lamella preparation process by means of a focused ion beam to preserve the NS growth direction...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906386/formation-of-surface-nanobubbles-on-nanostructured-substrates
#13
Lei Wang, Xingya Wang, Liansheng Wang, Jun Hu, Chun Lei Wang, Binyu Zhao, Xuehua Zhang, Renzhong Tai, Mengdong He, Liqun Chen, Lijuan Zhang
The nucleation and stability of nanoscale gas bubbles located at a solid/liquid interface are attracting significant research interest. It is known that the physical and chemical properties of the solid surface are crucial for the formation and properties of the surface nanobubbles. Herein, we experimentally and numerically investigated the formation of nanobubbles on nanostructured substrates. Two kinds of nanopatterned surfaces, namely, nanotrenches and nanopores, were fabricated using an electron beam lithography technique and used as substrates for the formation of nanobubbles...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906241/spatiotemporal-optical-dark-x-solitary-waves
#14
Fabio Baronio, Shihua Chen, Miguel Onorato, Stefano Trillo, Stefan Wabnitz, Yuji Kodama
We introduce spatiotemporal optical dark X solitary waves of the (2+1)D hyperbolic nonlinear Schrödinger equation (NLSE), which rules wave propagation in a self-focusing and normally dispersive medium. These analytical solutions are derived by exploiting the connection between the NLSE and a well-known equation of hydrodynamics, namely the type II Kadomtsev-Petviashvili (KP-II) equation. As a result, families of shallow water X soliton solutions of the KP-II equation are mapped into optical dark X solitary wave solutions of the NLSE...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27906221/highly-sensitive-fiber-laser-ultrasound-hydrophones-for-sensing-and-imaging-applications-publisher-s-note
#15
Di Liu, Yizhi Liang, Long Jin, Huojiao Sun, Linghao Cheng, Baoi-Ou Guan
This note corrects the range of acoustic frequencies mentioned in the opening paragraph of Opt. Lett.41, 4530 (2016)OPLEDP0146-959210.1364/OL.41.004530 as having rarely been investigated.
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27906140/management-of-citrus-waste-by-switching-in-the-production-of-nanocellulose
#16
Sania Naz, Naveed Ahmad, Javeed Akhtar, Nasir Mehmood Ahmad, Attarad Ali, Muhammad Zia
Citrus fruit processing industries produce a vast quantity of waste materials as peel and pulp that are not handled properly. In present study, waste generated from citrus has been used for extraction of cellulose and nanocellulose. The aggregated cellulose, derived after alkaline treatment, was acid hydrolysed; resulted in reduction of the size of cellulose fibre. The cellulose showed amorphous structure revealed by X-ray diffraction analysis. Scanning electron microscopy analysis explained densely packed structure of nanocellulose...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27906133/the-plastid-genome-of-some-eustigmatophyte-algae-harbours-a-bacteria-derived-six-gene-cluster-for-biosynthesis-of-a-novel-secondary-metabolite
#17
Tatiana Yurchenko, Tereza Ševčíková, Hynek Strnad, Anzhelika Butenko, Marek Eliáš
Acquisition of genes by plastid genomes (plastomes) via horizontal gene transfer (HGT) seems to be a rare phenomenon. Here, we report an interesting case of HGT revealed by sequencing the plastomes of the eustigmatophyte algae Monodopsis sp. MarTras21 and Vischeria sp. CAUP Q 202. These plastomes proved to harbour a unique cluster of six genes, most probably acquired from a bacterium of the phylum Bacteroidetes, with homologues in various bacteria, typically organized in a conserved uncharacterized putative operon...
November 2016: Open Biology
https://www.readbyqxmd.com/read/27906110/failed-upregulation-of-tfam-protein-and-mitochondrial-dna-in-oxidatively-deficient-fibers-of-chronic-obstructive-pulmonary-disease-locomotor-muscle
#18
Yana Konokhova, Sally Spendiff, R Thomas Jagoe, Sudhakar Aare, Sophia Kapchinsky, Norah J MacMillan, Paul Rozakis, Martin Picard, Mylène Aubertin-Leheudre, Charlotte H Pion, Jean Bourbeau, Russell T Hepple, Tanja Taivassalo
BACKGROUND: Low mitochondrial content and oxidative capacity are well-established features of locomotor muscle dysfunction, a prevalent and debilitating systemic occurrence in patients with chronic obstructive pulmonary disease (COPD). Although the exact cause is not firmly established, physical inactivity and oxidative stress are among the proposed underlying mechanisms. Here, we assess the impact of COPD pathophysiology on mitochondrial DNA (mtDNA) integrity, biogenesis, and cellular oxidative capacity in locomotor muscle of COPD patients and healthy controls...
February 18, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906068/novel-use-of-cranial-epidural-space-in-rabbits-as-an-animal-model-to-investigate-bone-volume-augmentation-potential-of-different-bone-graft-substitutes
#19
Ivan Valdivia-Gandur, Wilfried Engelke, Víctor Beltrán, Eduardo Borie, Ramón Fuentes, María Cristina Manzanares-Céspedes
BACKGROUND: The success of bone augmentation to a major degree depends on the biomechanics and biological conditions of the surrounding tissues. Therefore, an animal model is needed providing anatomical sites with similar mechanical pressures for comparing its influence on different biomaterials for bone regeneration. The present report describes the new bone formation associated to biomaterial in a bursa created in the epidural space, between dura mater and cranial calvaria, under the constant pressure of cerebrospinal fluid...
December 1, 2016: Head & Face Medicine
https://www.readbyqxmd.com/read/27906033/the-role-of-the-backbone-torsion-in-protein-folding
#20
EDITORIAL
Irina Sorokina, Arcady Mushegian
BACKGROUND: The set of forces and sequence of events that govern the transition from an unfolded polypeptide chain to a functional protein with correct spatial structure remain incompletely known, despite the importance of the problem and decades of theory development, computer simulations, and laboratory experiments. Information about the correctly folded state of most proteins is likely to be present in their sequences, and yet many proteins fail to attain native structure after overexpression in a non-native environment or upon experimental denaturation and refolding...
December 1, 2016: Biology Direct
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