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https://www.readbyqxmd.com/read/28350953/degradation-of-hole-transport-materials-via-exciton-driven-cyclization
#1
Bruce M Bell, Michael B Clark, David D Devore, Timothy S De Vries, Robert D J Froese, Kaitlyn C Gray, David H K Jackson, Thomas F Kuech, Hong-Yeop Na, Kenneth L Kearns, Kyung Joo Lee, Sukrit Mukhopadhyay, Aaron A Rachford, Liam Patrick Spencer, William Henry Hunter Woodward
Organic light emitting diode (OLED) displays have been an active and intense area of research for well over a decade and have now reached commercial success for displays from cell phones to large format televisions. A more thorough understanding of the many different potential degradation modes which cause OLED device failure will be necessary to develop the next generation of OLED materials, improve device lifetime, and to ultimately improve the cost vs. performance ratio. Each of the different organic layers in an OLED device can be susceptible to unique decomposition pathways, however stability towards excitons is critical for emissive layer (EML) materials as well as any layer near the recombination zone...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28346777/the-effect-of-intrinsic-disorder-and-self-association-on-the-translational-diffusion-of-proteins-the-case-of-%C3%AE-casein
#2
Daria L Melnikova, Vladimir Dmitrievich Skirda, Irina V Nesmelova
Translational diffusion is the major mode of macromolecular transport in leaving organisms and therefore it is vital to many biological and biotechnological processes. Although translational diffusion of proteins has received considerable theoretical and experimental scrutiny, much of that attention has been directed towards the description of globular proteins. The translational diffusion of intrinsically disordered proteins (IDPs), however, is much less studied. Here, we use a pulsed-gradient nuclear magnetic resonance technique (PFG NMR) to investigate the translational diffusion of a disordered protein in a wide range of concentrations using α-casein that belongs to the class of natively disordered proteins as an example...
March 27, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28345009/optically-induced-lattice-deformations-electronic-structure-changes-and-enhanced-superconductivity-in-yba2cu3o6-48
#3
R Mankowsky, M Fechner, M Först, A von Hoegen, J Porras, T Loew, G L Dakovski, M Seaberg, S Möller, G Coslovich, B Keimer, S S Dhesi, A Cavalleri
Resonant optical excitation of apical oxygen vibrational modes in the normal state of underdoped YBa2Cu3O6+x induces a transient state with optical properties similar to those of the equilibrium superconducting state. Amongst these, a divergent imaginary conductivity and a plasma edge are transiently observed in the photo-stimulated state. Femtosecond hard x-ray diffraction experiments have been used in the past to identify the transient crystal structure in this non-equilibrium state. Here, we start from these crystallographic features and theoretically predict the corresponding electronic rearrangements that accompany these structural deformations...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28341101/crucial-residue-trp158-of-lipoprotein-piaa-stabilizes-the-ferrichrome-piaa-complex-in-streptococcus-pneumoniae
#4
Liang Zhang, Nan Li, Kun Cao, Xiao-Yan Yang, Guandi Zeng, Xuesong Sun, Qing-Yu He
The pathogenic Streptococcus pneumoniae (S. pneumoniae) has evolved a special mechanism such as pneumococcal iron acquisition ATP binding cassette (PiaABC) to take up siderophore-iron from its host. The cell-surface lipoprotein PiaA, a key component of PiaABC, is the primary receptor to bind ferrichrome (Fc). To study the structure-function relationship of PiaA, three conservative amino-acid residues, Trp63, Trp158 and Phe255, in the hydrophobic barrel of the metal binding site of PiaA, were individually and collectively mutated to alanine; and the resulted single-point mutants, W63A, W158A and F255A, and triple mutant W63A/W158A/F255A were characterized by using biochemical and biophysical methods...
February 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28336961/voltage-induced-interface-reconstruction-and-electrical-instability-of-the-ferromagnet-semiconductor-device
#5
Shu-Jui Chang, Po-Chun Chang, Wen-Chin Lin, Shao-Hua Lo, Liang-Chun Chang, Shang-Fan Lee, Yuan-Chieh Tseng
Using x-ray magnetic spectroscopy with in-situ electrical characterizations, we investigated the effects of external voltage on the spin-electronic and transport properties at the interface of a Fe/ZnO device. Layer-, element-, and spin-resolved information of the device was obtained by cross-tuning of the x-ray mode and photon energy, when voltage was applied. At the early stage of the operation, the device exhibited a low-resistance state featuring robust Fe-O bonds. However, the Fe-O bonds were broken with increasing voltage...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336547/glycans-in-the-intestinal-peptide-transporter-pept1-contribute-to-function-and-protect-from-proteolysis
#6
Tamara Stelzl, Kerstin Elisabeth Geillinger-Kästle, Jürgen Stolz, Hannelore Daniel
Despite the fact that many membrane proteins carry extracellular glycans, little is known about whether the glycan chains also affect protein function. We recently demonstrated that the proton-coupled oligopeptide transporter 1 (PEPT1) in the intestine is glycosylated at six asparagine residues (N50, N406, N439, N510, N515, N532). Mutagenesis-induced disruption of the individual N-glycosylation site N50, which is highly conserved among mammals, was detected to significantly enhance the PEPT1 mediated inward transport of peptides...
March 23, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28335270/review-of-recent-developments-on-using-an-off-lattice-monte-carlo-approach-to-predict-the-effective-thermal-conductivity-of-composite-systems-with-complex-structures
#7
REVIEW
Feng Gong, Hai M Duong, Dimitrios V Papavassiliou
Here, we present a review of recent developments for an off-lattice Monte Carlo approach used to investigate the thermal transport properties of multiphase composites with complex structure. The thermal energy was quantified by a large number of randomly moving thermal walkers. Different modes of heat conduction were modeled in appropriate ways. The diffusive heat conduction in the polymer matrix was modeled with random Brownian motion of thermal walkers within the polymer, and the ballistic heat transfer within the carbon nanotubes (CNTs) was modeled by assigning infinite speed of thermal walkers in the CNTs...
July 30, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334529/ballistic-one-dimensional-inas-nanowire-cross-junction-interconnects
#8
Johannes Gooth, Mattias Borg, Heinz Schmid, Vanessa Schaller, Stephan Wirths, Kirsten Moselund, Mathieu Luisier, Siegfried Karg, Heike Riel
Coherent interconnection of quantum bits remains an ongoing challenge in quantum information technology. Envisioned hardware to achieve this goal is based on semiconductor nanowire (NW) circuits, comprising individual NW devices that are linked through ballistic interconnects. However, maintaining the sensitive ballistic conduction and confinement conditions across NW intersections is a nontrivial problem. Here, we go beyond the characterization of a single NW device and demonstrate ballistic one-dimensional (1D) quantum transport in InAs NW cross-junctions, monolithically integrated on Si...
March 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28332537/mapping-vibrational-surface-and-bulk-modes-in-a-single-nanocube
#9
Maureen J Lagos, Andreas Trügler, Ulrich Hohenester, Philip E Batson
Imaging of vibrational excitations in and near nanostructures is essential for developing low-loss infrared nanophotonics, controlling heat transport in thermal nanodevices, inventing new thermoelectric materials and understanding nanoscale energy transport. Spatially resolved electron energy loss spectroscopy has previously been used to image plasmonic behaviour in nanostructures in an electron microscope, but hitherto it has not been possible to map vibrational modes directly in a single nanostructure, limiting our understanding of phonon coupling with photons and plasmons...
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28326809/identifying-factors-affecting-the-safety-of-mid-block-bicycle-lanes-considering-mixed-two-wheeled-traffic-flow
#10
Lu Bai, Ching-Yao Chan, Pan Liu, Chengcheng Xu
OBJECTIVE: Electric bikes (e-bikes) were one of the fastest growing trip modes in Southeast Asia over the past two decades. The increasing popularity of e-bikes raised some safety concerns on urban transport system. The primary objective of this study was to identify whether and how the generalized linear regression model (GLM) could be used to relate the cyclists' safety with various contributing factors when they were riding in a mid-block bike lane. The types of two-wheeled vehicles in the study included bicycle style electric bicycles (BSEBs), scooter style electric bicycles (SSEBs) and regular bicycles (RBs)...
March 22, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28326227/uptake-of-the-proteins-htra1-and-htra2-by-cells-mediated-by-calcium-phosphate-nanoparticles
#11
Olga Rotan, Katharina N Severin, Simon Pöpsel, Alexander Peetsch, Melisa Merdanovic, Michael Ehrmann, Matthias Epple
The efficient intracellular delivery of (bio)molecules into living cells remains a challenge in biomedicine. Many biomolecules and synthetic drugs are not able to cross the cell membrane, which is a problem if an intracellular mode of action is desired, for example, with a nuclear receptor. Calcium phosphate nanoparticles can serve as carriers for small and large biomolecules as well as for synthetic compounds. The nanoparticles were prepared and colloidally stabilized with either polyethyleneimine (PEI; cationic nanoparticles) or carboxymethyl cellulose (CMC; anionic nanoparticles) and loaded with defined amounts of the fluorescently labelled proteins HTRA1, HTRA2, and BSA...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28319165/psychosocial-and-environmental-correlates-of-active-and-passive-transport-behaviors-in-college-educated-and-non-college-educated-working-young-adults
#12
Dorien Simons, Ilse De Bourdeaudhuij, Peter Clarys, Katrien De Cocker, Bas de Geus, Corneel Vandelanotte, Jelle Van Cauwenberg, Benedicte Deforche
BACKGROUND: This study aimed to examine potential differences in walking, cycling, public transport and passive transport (car/moped/motorcycle) to work and to other destinations between college and non-college educated working young adults. Secondly, we aimed to investigate which psychosocial and environmental factors are associated with the four transport modes and whether these associations differ between college and non-college educated working young adults. METHODS: In this cross-sectional study, 224 working young adults completed an online questionnaire assessing socio-demographic variables (8 items), psychosocial variables (6 items), environmental variables (10 items) and transport mode (4 types) and duration to work/other destinations...
2017: PloS One
https://www.readbyqxmd.com/read/28318906/analysis-of-molecular-mechanisms-of-atp-synthesis-from-the-standpoint-of-the-principle-of-electrical-neutrality
#13
REVIEW
Sunil Nath
Theories of biological energy coupling in oxidative phosphorylation (OX PHOS) and photophosphorylation (PHOTO PHOS) are reviewed and applied to ATP synthesis by an experimental system containing purified ATP synthase reconstituted into liposomes. The theories are critically evaluated from the standpoint of the principle of electrical neutrality. It is shown that the obligatory requirement to maintain overall electroneutrality of bulk aqueous phases imposes strong constraints on possible theories of energy coupling and molecular mechanisms of ATP synthesis...
March 8, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28306303/excitons-in-topological-kondo-insulators-theory-of-thermodynamic-and-transport-anomalies-in-smb_-6
#14
Johannes Knolle, Nigel R Cooper
Kondo insulating materials lie outside the usual dichotomy of weakly versus correlated-band versus Mott-insulators. They are metallic at high temperatures but resemble band insulators at low temperatures because of the opening of an interaction-induced band gap. The first discovered Kondo insulator (KI) SmB_{6} has been predicted to form a topological KI (TKI). However, since its discovery thermodynamic and transport anomalies have been observed that have defied a theoretical explanation. Enigmatic signatures of collective modes inside the charge gap are seen in specific heat, thermal transport, and quantum oscillation experiments in strong magnetic fields...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28306291/new-paradigm-for-turbulent-transport-across-a-steep-gradient-in-toroidal-plasmas
#15
H S Xie, Y Xiao, Z Lin
First principles gyrokinetic simulation of the edge turbulent transport in toroidal plasmas finds a reverse trend in the turbulent transport coefficients under strong gradients. It is found that there exist both linear and nonlinear critical gradients for the nonmonotonicity of transport characteristics. The discontinuity of the transport flux slope around the turning gradient shows features of a second order phase transition. Under a strong gradient the most unstable modes are in nonground eigenstates with unconventional mode structures, which significantly reduces the effective correlation length and thus reverse the transport trend...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28303713/growth-of-single-crystalline-cadmium-iodide-nanoplates-cdi2-mos2-ws2-wse2-van-der-waals-heterostructures-and-patterned-arrays
#16
Ruoqi Ai, Xun Guan, Jia Li, Kangkang Yao, Peng Chen, Zhengwei Zhang, Xidong Duan, Xiangfeng Duan
Two-dimensional layered materials (2DLMs) have attracted considerable recent interest for their layer-number-dependent physical and chemical properties, as well as potential technological opportunities. Here we report the synthesis of two-dimensional layered cadmium iodide (CdI2) nanoplates using a vapor transport and deposition approach. Optical microscopy and scanning electron microscopy studies show that the resulting CdI2 nanoplates predominantly adopt hexagonal and triangular morphologies with a lateral dimension of ∼2-10 μm...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28300158/the-receptor-like-pseudokinase-mrh1-interacts-with-the-voltage-gated-potassium-channel-akt2
#17
Kamil Sklodowski, Janin Riedelsberger, Natalia Raddatz, Gonzalo Riadi, Julio Caballero, Isabelle Chérel, Waltraud Schulze, Alexander Graf, Ingo Dreyer
The potassium channel AKT2 plays important roles in phloem loading and unloading. It can operate as inward-rectifying channel that allows H(+)-ATPase-energized K(+) uptake. Moreover, through reversible post-translational modifications it can also function as an open, K(+)-selective channel, which taps a 'potassium battery', providing additional energy for transmembrane transport processes. Knowledge about proteins involved in the regulation of the operational mode of AKT2 is very limited. Here, we employed a large-scale yeast two-hybrid screen in combination with fluorescence tagging and null-allele mutant phenotype analysis and identified the plasma membrane localized receptor-like kinase MRH1/MDIS2 (AT4G18640) as interaction partner of AKT2...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299370/change-in-commute-mode-and-body-mass-index-prospective-longitudinal-evidence-from-uk-biobank
#18
Ellen Flint, Elizabeth Webb, Steven Cummins
BACKGROUND: Insufficient physical activity is a determinant of obesity and cardiovascular disease. Active travel to work has declined in high-income countries in recent decades. We aimed to determine which socioeconomic and demographic characteristics predicted switching to or from active commuting, whether switching from passive to active commuting (or the reverse) independently predicts change in objectively measured body-mass index (BMI), and to ascertain whether any association is attenuated by socioeconomic, demographic, or behavioural factors...
December 2016: Lancet Public Health
https://www.readbyqxmd.com/read/28297920/electric-field-induced-transport-of-microspheres-in-the-isotropic-and-chiral-nematic-phase-of-liquid-crystals
#19
Jiyoung Oh, Helen F Gleeson, Ingo Dierking
The application of an electric field to microspheres suspended in a liquid crystal causes particle translation in a plane perpendicular to the applied field direction. Depending on applied electric field amplitude and frequency, a wealth of different motion modes may be observed above a threshold, which can lead to linear, circular, or random particle trajectories. We present the stability diagram for these different translational modes of particles suspended in the isotropic and the chiral nematic phase of a liquid crystal and investigate the angular velocity, circular diameter, and linear velocity as a function of electric field amplitude and frequency...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28296205/the-fungal-umsrt1-and-maize-zmsut1-sucrose-transporters-battle-for-plant-sugar-resources
#20
Anke Wittek, Ingo Dreyer, Khaled A S Al-Rasheid, Norbert Sauer, Rainer Hedrich, Dietmar Geiger
The biotrophic fungus Ustilago maydis causes the corn smut disease inducing tumor formation in its host Zea mays. Upon infection, the fungal hyphae invaginate the plasma membrane of infected maize cells establishing an interface where pathogen and host are separated only by their plasma membranes. At this interface the fungal and maize sucrose transporters, UmSrt1 and ZmSUT1, compete for extracellular sucrose in the corn smut/maize pathosystem. Here we biophysically characterized ZmSUT1 and UmSrt1 in Xenopus oocytes with respect to their voltage-, pH- and substrate-dependence and determined affinities towards protons and sucrose...
March 15, 2017: Journal of Integrative Plant Biology
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