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https://www.readbyqxmd.com/read/28528505/enhanced-degradation-of-perfluorooctanoic-acid-using-dielectric-barrier-discharge-with-la-ce-doped-tio2
#1
Shanping Li, Xiaoping Wang, Lijun Liu, Yongbo Guo, Qinglin Mu, Abdelwahid Mellouki
A synergistic system of dielectric barrier discharge (DBD) combined with La/Ce-TiO2 was developed to investigate the decomposition performance of the environmentally persistent perfluorooctanoic acid (PFOA). The La/Ce-TiO2 was modified by sol-gel method and characterized by XRD, SEM, and energy dispersive X-ray. The effects of PFOA concentration, applied voltage, initial pH, liquid conductivity, and additives on the removal rate of PFOA were explored. The results showed that the La/Ce-TiO2 exhibited excellent catalytic effects on PFOA degradation in DBD system...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528255/molecular-structure-second-and-third-order-nonlinear-optical-properties-and-dft-studies-of-a-novel-non-centrosymmetric-chalcone-derivative-2e-3-4-fluorophenyl-1-4-1e-4-fluorophenyl-methylene-amino-phenyl-prop-2-en-1-one
#2
Shivaraj R Maidur, Parutagouda Shankaragouda Patil, Anusha Ekbote, Tze Shyang Chia, Ching Kheng Quah
In the present work, the title chalcone, (2E)-3-(4-fluorophenyl)-1-(4-{[(1E)-(4-fluorophenyl) methylene]amino}phenyl)prop-2-en-1-one (abbreviated as FAMFC), was synthesized and structurally characterized by single-crystal X-ray diffraction. The compound is crystallized in the monoclinic system with non-centrosymmetric space group P21 and hence it satisfies the essential condition for materials to exhibit second-order nonlinear optical properties. The molecular structure was further confirmed by using FT-IR and (1)H NMR spectroscopic techniques...
May 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28528252/investigation-of-the-binding-affinity-in-vitamin-b12-bovine-serum-albumin-system-using-various-spectroscopic-methods
#3
Magdalena Makarska-Bialokoz
The binding affinity between vitamin B12 (VitB12) and bovine serum albumin (BSA) has been investigated in aqueous solution at pH=7.4, employing UV-vis absorption and steady-state, synchronous and three-dimensional fluorescence spectra techniques. Representative effects noted for BSA intrinsic fluorescence resulting from the interactions with VitB12 confirm the formation of π-π stacked non-covalent and non-fluorescent complexes in the system VitB12-BSA. All the determined parameters, the binding, fluorescence quenching and bimolecular quenching rate constants (of the order of 10(4)Lmol(-1), 10(3)Lmol(-1) and 10(11)Lmol(-1)s(-1), respectively), as well as Förster resonance energy transfer parameters validate the mechanism of static quenching...
May 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28527805/effects-of-replacement-of-late-harvested-grass-silage-and-barley-with-early-harvested-silage-on-milk-production-and-methane-emissions
#4
E H Cabezas-Garcia, S J Krizsan, K J Shingfield, P Huhtanen
This study evaluated the effects of gradual replacement of a mixture of late-cut grass silage (LS) and barley with early-cut grass silage (ES) on milk production, CH4 emissions, and N utilization in Swedish Red cows. Two grass silages were prepared from the same primary growth of timothy grass sward but harvested 2 wk apart [11.0 and 9.7 MJ of metabolizable energy/kg of dry matter (DM)]. Four diets, fed as a total mixed ration, were formulated to meet the metabolizable energy and protein requirements of 35 kg of energy-corrected milk (ECM) by gradually replacing a mixture of LS and barley with ES (0, 33, 67, and 100% of the forage component of the diet), whereas the proportion of barley decreased from 47...
May 17, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28527738/life-cycle-assessment-of-sustainable-raw-material-acquisition-for-functional-magnetite-bionanoparticle-production
#5
Jhuma Sadhukhan, Nimisha Joshi, Mobolaji Shemfe, Jonathan R Lloyd
Magnetite nanoparticles (MNPs) have several applications, including use in medical diagnostics, renewable energy production and waste remediation. However, the processes for MNP production from analytical-grade materials are resource intensive and can be environmentally damaging. This work for the first time examines the life cycle assessment (LCA) of four MNP production cases: (i) industrial MNP production system; (ii) a state-of-the-art MNP biosynthesis system; (iii) an optimal MNP biosynthesis system and (iv) an MNP biosynthesis system using raw materials sourced from wastewaters, in order to recommend a sustainable raw material acquisition pathway for MNP synthesis...
May 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28527605/analysis-of-gafchromic-ebt3-film-calibration-irradiated-with-gamma-rays-from-different-systems-gamma-knife-and-cobalt-60-unit
#6
Monsen Najafi, Ghazale Geraily, Alireza Shirazi, Mahbod Esfahani, Javad Teimouri
In recent years, Gafchromic films are used as an advanced instrument for dosimetry systems. The EBT3 films are a new generation of Gafchromic films. Our main interest is to compare the response of the EBT3 films exposed to gamma rays provided by the Theratron 780C as a conventional radiotherapy system and the Leksell Gamma Knife as a stereotactic radiotherapy system (SRS). Both systems use Cobalt-60 sources, thus using the same energy. However, other factors such as source-to-axis distance, number of sources, dose rate, direction of irradiation, shape of phantom, the field shape of radiation, and different scatter contribution may influence the calibration curve...
May 17, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28527457/role-of-quantum-coherence-in-shaping-the-line-shape-of-an-exciton-interacting-with-a-spatially-and-temporally-correlated-bath
#7
Rajesh Dutta, Kaushik Bagchi, Biman Bagchi
Kubo's fluctuation theory of line shape forms the backbone of our understanding of optical and vibrational line shapes, through such concepts as static heterogeneity and motional narrowing. However, the theory does not properly address the effects of quantum coherences on optical line shape, especially in extended systems where a large number of eigenstates are present. In this work, we study the line shape of an exciton in a one-dimensional lattice consisting of regularly placed and equally separated optical two level systems...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527451/resonance-tunneling-electron-vibrational-spectroscopy-of-polyoxometalates
#8
F I Dalidchik, S A Kovalevskii, E M Balashov
The tunneling spectra of the ordered monolayer films of decamolybdodicobaltate (DMDC) compounds deposited from aqueous solutions on HOPG were measured by scanning tunnel microscopy in air. The DMDC spectra, as well as the tunneling spectra of other polyoxometalates (POMs), exhibit well-defined negative differential resistances (NDRs). The mechanism of formation of these spectral features was established from the collection of revealed NDR dependences on the external varying parameters and found to be common to all systems exhibiting Wannier-Stark localization...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527449/correlated-matrix-fluctuation-mediated-activated-transport-of-dilute-penetrants-in-glass-forming-liquids-and-suspensions
#9
Rui Zhang, Kenneth S Schweizer
We formulate a microscopic, force-level statistical mechanical theory for the activated diffusion of dilute penetrants in dense liquids, colloidal suspensions, and glasses. The approach explicitly and self-consistently accounts for coupling between penetrant hopping and matrix dynamic displacements that actively facilitate the hopping event. The key new ideas involve two mechanistically (at a stochastic trajectory level) coupled dynamic free energy functions for the matrix and spherical penetrant particles...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527312/low-energy-electron-potentiometry
#10
Johannes Jobst, Jaap Kautz, Maria Mytiliniou, Rudolf M Tromp, Sense Jan van der Molen
In a lot of systems, charge transport is governed by local features rather than being a global property as suggested by extracting a single resistance value. Consequently, techniques that resolve local structure in the electronic potential are crucial for a detailed understanding of electronic transport in realistic devices. Recently, we have introduced a new potentiometry method based on low-energy electron microscopy (LEEM) that utilizes characteristic features in the reflectivity spectra of layered materials [1]...
May 13, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28526865/realization-of-large-energy-proportion-in-the-central-lobe-by-coherent-beam-combination-based-on-conformal-projection-system
#11
Dong Zhi, Zhixin Zhang, Yanxing Ma, Xiaolin Wang, Zilun Chen, Wuming Wu, Pu Zhou, Lei Si
In this paper, we experimentally validate a tiled-aperture conformal projection system with the largest array filling factor and element beam truncation factor to the best of our knowledge. The conformal projection system, which is made up of a hexagonal adaptive fiber-optics collimator (AFOC) array with the proximate ideal intensity distributions, is fabricated and the performance of output beam is tested and evaluated properly and carefully. Both of the active phase-locking control and precise tip-tilt control are implemented successfully in the CBC of the hexagonal seven-beam-array...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526835/large-field-of-view-fast-and-low-dose-multimodal-phase-contrast%C3%A2-imaging-at-high-x-ray-energy
#12
Alberto Astolfo, Marco Endrizzi, Fabio A Vittoria, Paul C Diemoz, Benjamin Price, Ian Haig, Alessandro Olivo
X-ray phase contrast imaging (XPCI) is an innovative imaging technique which extends the contrast capabilities of 'conventional' absorption based x-ray systems. However, so far all XPCI implementations have suffered from one or more of the following limitations: low x-ray energies, small field of view (FOV) and long acquisition times. Those limitations relegated XPCI to a 'research-only' technique with an uncertain future in terms of large scale, high impact applications. We recently succeeded in designing, realizing and testing an XPCI system, which achieves significant steps toward simultaneously overcoming these limitations...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526530/insights-into-the-early-stage-of-pinus-nigra-arn-somatic-embryogenesis-using-discovery-proteomics
#13
Katarína Klubicová, Lubica Uvácková, Maksym Danchenko, Peter Nemecek, Ludovít Skultéty, Ján Salaj, Terézia Salaj
The somatic embryogenesis in conifers represents a suitable model of plant regeneration system facilitating studies of fundamental aspects of an early development as well as in vitro micropropagation. The aim of our study was to deeper understand the somatic embryogenesis in the conifer tree Pinus nigra Arn. Comparative proteomic analysis based on 2D-PAGE in 1) proliferating embryogenic tissues (E) initiated from immature zygotic embryos, 2) non-embryogenic calli (NEC) initiated from cotyledons of somatic seedlings of the same genotypes, 3) embryogenic tissues that lost the maturation capacity (E-L) of two cell lines (E362, E366)...
May 16, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28525653/predicted-philogeny-secondary-conformational-structure-and-epitope-antigenicity-of-immunological-sequences-in-poultry
#14
L J Lara, A P Peconick, É J Fassani, A M P Júnior, P R B Chalfun, D L Raymundo, T A Barçante, J M de P Barçante
Poultry production is faced with different types of stresses that are responsible for issues of animal welfare as well as for economic losses. Moreover, the immunity decreases when animals are stressed. In silico analyses are important in reducing the cost and in increasing the accuracy of scientific results. A bioinformatics tool was used to perform ontology studies on 15 different immunological sequences of poultry. The mRNA structures and sequences with maximum antigenic residues were also predicted. No homology was found between the sequences of poultry and mammals...
May 18, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28525391/titanium-dioxide-nanowire-sensor-array-integration-on-cmos-platform-using-deterministic-assembly
#15
Oren Gall, Xiahua Zhong, Daniel Schulman, Myungkoo Kang, Ali Razavieh, Theresa Mayer
Nanosensor arrays have recently received significant attention due to their utility in a wide range of applications, including gas sensing, fuel cells, internet of things (IoT), and portable health monitoring systems. Less attention has been given to the production of sensor platforms in the µW range for ultra-low power applications. Here, we discuss how to scale the nanosensor energy demand by developing a process for integration of nanowire sensing arrays on a monolithic CMOS chip. This work demonstrates an off-chip nanowire fabrication method; subsequently nanowires link to a fused SiO2 substrate using electric-field assisted directed assembly...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28525274/metal-nanoparticle-catalyzed-hydrogen-generation-from-formic-acid
#16
Zhangpeng Li, Qiang Xu
To meet the ever-increasing energy demand, the development of effective, renewable, and environmentally friendly sources of alternative energy is imperative. Hydrogen (H2) is a renewable, clean energy carrier, which exhibits a threefold energy density compared to gasoline; H2 is considered one of the most promising alternative energy carriers for enabling a secure, clean energy future. However, the realization of a hydrogen economy is restricted by several unresolved issues. Particularly, one of the most difficult challenges is the development of a safe, efficient hydrogen storage and delivery system...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28524924/a-theoretical-study-on-the-mechanistic-highlights-behind-the-br%C3%A3-nsted-acid-dependent-mer-fac-isomerization-of-homoleptic-carbenic-iridium-complexes-for-pholeds
#17
Tobias Setzer, Christian Lennartz, Andreas Dreuw
Recently, a successful Brønsted-acid mediated geometric isomerization of the meridional homoleptic carbenic iridium(iii) complexes tris-(N-phenyl,N-methyl-benzimidazol-2-yl)iridium(iii) (1) and tris-(N-phenyl,N-benzyl-benzimidazol-2-yl)iridium(iii) (2) into their facial form has been reported. In the present work the pronounced acid-dependency of this particular isomerization procedure is revisited and additional mechanistic pathways are taken into account. Moreover, the acid-induced material decomposition is addressed...
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28524913/periodic-oscillation-of-ion-conduction-of-nanofluidic-diodes-using-a-chemical-oscillator
#18
Huacheng Zhang, Jue Hou, Ranwen Ou, Yaoxin Hu, Huanting Wang, Lei Jiang
Periodic ion-conduction oscillation of biological ion channels in a living system is essential for numerous life processes. Here we report an oscillatory nanofluidic system that can self-regulate its ion-conduction states under constant conditions. The oscillatory nanofluidic system is constructed by integrating a chemical oscillator into an artificial single nanochannel system. Oscillating chemical reactions of the pH oscillator carried out inside the nanochannel are used to switch the surface properties of the channel between highly and lowly charged states, thus realizing an autonomous, continuous and periodic oscillation of the ion conductance of the channel between high and low ion-conduction states...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28524879/energy-landscape-driven-non-equilibrium-evolution-of-inherent-structure-in-disordered-material
#19
Yue Fan, Takuya Iwashita, Takeshi Egami
Complex states in glasses can be neatly expressed by the potential energy landscape (PEL). However, because PEL is highly multi-dimensional it is difficult to describe how the system moves around in PEL. Here we demonstrate that it is possible to predict the evolution of macroscopic state in a metallic glass, such as ageing and rejuvenation, through a set of simple equations describing excitations in the PEL. The key to this simplification is the realization that the step of activation from the initial state to the saddle point in PEL and the following step of relaxation to the final state are essentially decoupled...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524680/cavity-cooling-of-many-atoms
#20
Mahdi Hosseini, Yiheng Duan, Kristin M Beck, Yu-Ting Chen, Vladan Vuletić
We demonstrate cavity cooling of all motional degrees of freedom of an atomic ensemble using light that is far detuned from the atomic transitions by several gigahertz. The cooling is achieved by cavity-induced frequency-dependent asymmetric enhancement of the atomic emission spectrum, thereby extracting thermal kinetic energy from the atomic system. Within 100 ms, the atomic temperature is reduced from 200 to 10  μK, where the final temperature is mainly limited by the linewidth of the cavity. In principle, the technique can be applied to molecules and atoms with complex internal energy structure...
May 5, 2017: Physical Review Letters
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