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https://www.readbyqxmd.com/read/28432309/fano-resonance-with-high-local-field-enhancement-under-azimuthally-polarized-excitation
#1
Wuyun Shang, Fajun Xiao, Weiren Zhu, Hongsen He, Malin Premaratne, Ting Mei, Jianlin Zhao
Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB)...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429391/technical-note-direct-measurement-of-continuous-tmr-data-with-a-1d-tank-and-automated-couch-movements
#2
Nels C Knutson, Matthew C Schmidt, Matthew D Belley, Ngoc Nguyen, H Harold Li, Erno Sajo, Michael Price
PURPOSE: Real-time dynamic control of the linear accelerator, couch, and imaging parameters during radiation delivery was investigated as a novel technique for acquiring tissue maximum ratio (TMR) data. METHODS: TrueBeam Developer Mode (Varian Medical Systems, Palo Alto, CA) was used to control the linear accelerator using the Extensible Markup Language (XML). A single XML file was used to dynamically manipulate the machine, couch, and imaging parameters during radiation delivery...
April 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28426435/surface-plasmon-resonance-in-gold-nanoparticles-a-review
#3
Vincenzo Amendola, Roberto Pilot, Marco Frasconi, Onofrio M Maragò, Maria Antonia Iatì
In the last two decades, plasmon resonance in gold nanoparticles (Au NPs) has been the subject of intense research efforts. Plasmon physics is intriguing and its precise modelling proved to be challenging. In fact, plasmons are highly responsive to a multitude of factors, either intrinsic to the Au NPs or from the environment, and recently the need emerged for the correction of standard electromagnetic approaches with quantum effects. Applications related to plasmon absorption and scattering in Au NPs are impressively numerous, ranging from sensing to photothermal effects to cell imaging...
May 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28426139/engineering-a-promiscuous-tautomerase-into-a-more-efficient-aldolase-for-self-condensations-of-linear-aliphatic-aldehydes
#4
Mehran Rahimi, Jan Ytzen van der Meer, Edzard Geertsema, Gerrit Jan Poelarends
4-Oxalocrotonate tautomerase (4-OT) from P. putida mt-2 takes part in a catabolic pathway for aromatic hydrocarbons, where it catalyzes the conversion of 2-hydroxyhexa-2,4-dienedioate into 2-oxohexa-3-enedioate. This tautomerase can also promiscuously catalyze carbon-carbon bond-forming reactions, including various types of aldol reactions, utilizing its N-terminal proline as a key catalytic residue. Here, we have used a systematic mutagenesis strategy to identify two 'hotspot' positions in 4-OT (Met-45 and Phe-50) at which single mutations give a marked improvement in aldolase activity for the self-condensation of propanal...
April 20, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28425524/excited-state-relaxation-processes-of-h2-evolving-ru-pd-supramolecular-photocatalysts-containing-a-linear-or-non-linear-bridge-a-dft-and-tddft-study
#5
Jun Cao, Yun Zhou
In this study, the early-time excited state relaxation processes of bimetallic Ru-Pd supramolecular photocatalysts containing a linear 2,2':5',2''-terpyridine or a nonlinear 2,2':6',2''-terpyridine bridging ligand (BL) were investigated by density functional theory (DFT) and time-dependent DFT (TDDFT) approaches. The bridge based metal-to-ligand charge transfer triplet ((3)MLCT) state of the metal complex containing a linear bridging ligand was calculated to be the lowest energy triplet (T1) state which is closely related to the photocatalytic H2 production, while for that having a nonlinear bridging ligand, the T1 state is a Ru metal-centered (MC) triplet ((3)MCRu) state that is short-lived and rapidly decays to the ground electronic state (S0)...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28425134/record-broken-a-copper-peroxide-complex-with-enhanced-stability-and-faster-hydroxylation-catalysis
#6
Sonja Herres-Pawlis, Patricia Liebhäuser, Kristina Keisers, Alexander Hoffmann, Thomas Schnappinger, Isabella Sommer, Anne Thoma, Claudia Wilfer, Roland Schoch, Kai Stührenberg, Matthias Bauer, Maximilian Dürr, Ivana Ivanovic-Burmazovic
Tyrosinase model systems pinpoint pathways to translate nature´s synthetic abilities into useful synthetic catalysts. Mostly, they use N-donor ligands which mimic the histidine residues coordinating the two copper centres. Copper complexes with bis(pyrazolyl)methanes with pyridinyl or imidazolyl moieties are already reported as excellent tyrosinase models. Substitution of the pyridinyl donor results now in the new ligand HC(3 tBuPz)2(4 CO2MePy) which stabilises a room-temperature stable -2:2-peroxide dicopper(II) species upon oxygenation...
April 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28423890/physicochemical-characteristics-and-fatty-acid-profiles-of-muscle-tissues-from-hanwoo-steers-fed-a-total-mixed-ration-supplied-with-medicinal-plant-by-products
#7
Shin Ja Lee, Do Hyung Kim, Han Sul Yang, Ki Chang Nam, Seung Kyu Ahn, Sung Kwon Park, Chang Weon Choi, Sung Sill Lee
Objective: Using medicinal plant by-products (MPBP) as feed additives may be an eco-friendly option as substitutes for feedstuffs and may assist in reducing the improper disposal of MPBP. Therefore, this study was conducted to evaluate the influences of medicinal plant by-products on the meat quality of Hanwoo steers fed a total mixed ration (TMR). Methods: Twenty seven steers (BW = 573 ± 57 kg) were randomly divided into three treatments with a control group and two tested groups as follows: control, 1000 g/kg TMR; treatment 1 (MPBP30), 970 g/kg TMR and 30 g/kg MPBP; treatment 2 (MPBP50), 950 g/kg TMR and 50 g/kg MPBP...
March 25, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28422975/children-s-weight-changes-according-to-maternal-perception-of-the-child-s-weight-and-health-a-prospective-cohort-of-peruvian-children
#8
Rodrigo M Carrillo-Larco, Antonio Bernabe-Ortiz, J Jaime Miranda, Hong Xue, Youfa Wang
The aim of the study was to estimate the association between maternal perception of their child's health status and (mis)classification of their child's actual weight with future weight change. We present cross-sectional and longitudinal analyses from the Peruvian younger cohort of the Young Lives Study. For cross-sectional analysis, the exposure was maternal perception of child health status (better, same or worse); the outcome was underestimation or overestimation of the child's actual weight. Mothers were asked about their perception of their child's weight (same, lighter or heavier than other children)...
2017: PloS One
https://www.readbyqxmd.com/read/28422916/beware-of-the-interval-cholecystectomy
#9
James Ackerman, Ryan Abegglen, Mark Scaife, Andrew Peitzman, Matthew Rosengart, Wallis Marsh, Kurt Stahlfeld
BACKGROUND *: Despite limited data regarding the indications and effectiveness of percutaneous cholecystostomy (PC) in the treatment of acute cholecystitis (AC), usage has increased by over 500% since 1994. Many of these patients subsequently undergo interval cholecystectomy (IC), a procedure that has not been rigorously evaluated. This aim of this study was to quantify the morbidity and mortality associated with the IC. METHODS *: We included all consecutive adult patients (>18 years old) who underwent PC and IC from January 2008 to December 2013...
April 18, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28421858/multi-step-treatment-for-acquired-alexia-and-agraphia-part-i-efficacy-generalisation-and-identification-of-beneficial-treatment-steps
#10
Jeffrey P Johnson, Katrina Ross, Swathi Kiran
Reading and writing impairments are common in individuals with post-stroke aphasia. Treatment typically aims to improve the function of one of these modalities by strengthening aspects of either lexical or sublexical processing. In the present study, eight adults with acquired alexia and agraphia were administered a comprehensive treatment targeting specific lexical and sublexical processes underlying reading and/or writing. Two participants were trained in reading and six were trained in writing. Throughout treatment, reading and writing accuracy were monitored for trained items, as well as untrained but orthographically and semantically related items...
April 19, 2017: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/28416965/a-crisis-of-protection-and-safe-passage-violence-experienced-by-migrants-refugees-travelling-along-the-western-balkan-corridor-to-northern-europe
#11
Jovana Arsenijević, Erin Schillberg, Aurelie Ponthieu, Lucio Malvisi, Waeil A Elrahman Ahmed, Stefano Argenziano, Federica Zamatto, Simon Burroughs, Natalie Severy, Christophe Hebting, Brice de Vingne, Anthony D Harries, Rony Zachariah
BACKGROUND: Pushed by ongoing conflicts and pulled by the desire for a better life, over one million migrants/refugees transited Balkan countries and arrived in Europe during 2015 and early 2016. To curb this influx, European countries instituted restrictive migration policies often characterized by building of razor-wire border fences and border closures. Among migrants/refugees who received mental health care in Serbia while travelling through Balkan countries to Northern Europe, we assessed the prevalence and patterns of violent events experienced including physical trauma...
2017: Conflict and Health
https://www.readbyqxmd.com/read/28413777/sex-differences-in-the-interacting-roles-of-impulsivity-and-positive-alcohol-expectancy-in-problem-drinking-a-structural-brain-imaging-study
#12
Jaime S Ide, Simon Zhornitsky, Sien Hu, Sheng Zhang, John H Krystal, Chiang-Shan R Li
Alcohol expectancy and impulsivity are implicated in alcohol misuse. However, how these two risk factors interact to determine problem drinking and whether men and women differ in these risk processes remain unclear. In 158 social drinkers (86 women) assessed for Alcohol Use Disorder Identification Test (AUDIT), positive alcohol expectancy, and Barratt impulsivity, we examined sex differences in these risk processes. Further, with structural brain imaging, we examined the neural bases underlying the relationship between these risk factors and problem drinking...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28409950/boson-sampling-with-single-photon-fock-states-from-a-bright-solid-state-source
#13
J C Loredo, M A Broome, P Hilaire, O Gazzano, I Sagnes, A Lemaitre, M P Almeida, P Senellart, A G White
A boson-sampling device is a quantum machine expected to perform tasks intractable for a classical computer, yet requiring minimal nonclassical resources as compared to full-scale quantum computers. Photonic implementations to date employed sources based on inefficient processes that only simulate heralded single-photon statistics when strongly reducing emission probabilities. Boson sampling with only single-photon input has thus never been realized. Here, we report on a boson-sampling device operated with a bright solid-state source of single-photon Fock states with high photon-number purity: the emission from an efficient and deterministic quantum dot-micropillar system is demultiplexed into three partially indistinguishable single photons, with a single-photon purity 1-g^{(2)}(0) of 0...
March 31, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28409930/ultrathin-nonlinear-metasurface-for-optical-image-encoding
#14
Felicitas Walter, Guixin Li, Cedrik Meier, Shuang Zhang, Thomas Zentgraf
Security of optical information is of great importance in modern society. Many cryptography techniques based on classical and quantum optics have been widely explored in the linear optical regime. Nonlinear optical encryption, in which encoding and decoding involve nonlinear frequency conversions, represents a new strategy for securing optical information. Here, we demonstrate that an ultrathin nonlinear photonic metasurface, consisting of meta-atoms with three-fold rotational symmetry, can be used to hide optical images under illumination with a fundamental wave...
April 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28406983/an-algorithm-for-constructing-the-skeleton-graph-of-degenerate-systems-of-linear-inequalities
#15
José Manuel Méndez Martínez, Jesús Urías
Derive the quantitative predictions of constraint-based models require of conversion algorithms to enumerate and construct the skeleton graph conformed by the extreme points of the feasible region, where all constraints in the model are fulfilled. The conversion is problematic when the system of linear constraints is degenerate. This paper describes a conversion algorithm that combines the best of two methods: the incremental slicing of cones that defeats degeneracy and pivoting for a swift traversal of the set of extreme points...
2017: PloS One
https://www.readbyqxmd.com/read/28406231/environmentally-friendly-synthesis-of-ceo2-nanoparticles-for-the-catalytic-oxidation-of-benzyl-alcohol-to-benzaldehyde-and-selective-detection-of-nitrite
#16
P Tamizhdurai, Subramanian Sakthinathan, Shen-Ming Chen, K Shanthi, S Sivasanker, P Sangeetha
Cerium oxide nanoparticles (CeO2 NPs) are favorable in nanotechnology based on some remarkable properties. In this study, the crystalline CeO2 NPs are successfully prepared by an efficient microwave combustion (MCM) and conventional route sol-gel (CRSGM) methods. The structural morphology of the as-prepared CeO2 NPs was investigated by various spectroscopic and analytical techniques. Moreover, the XRD pattern confirmed the formation of CeO2 NPs as a face centered cubic structure. The magnetometer studies indicated the low saturation magnetization (23...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405381/a-model-of-urban-scaling-laws-based-on-distance-dependent-interactions
#17
Fabiano L Ribeiro, Joao Meirelles, Fernando F Ferreira, Camilo Rodrigues Neto
Socio-economic related properties of a city grow faster than a linear relationship with the population, in a log-log plot, the so-called superlinear scaling. Conversely, the larger a city, the more efficient it is in the use of its infrastructure, leading to a sublinear scaling on these variables. In this work, we addressed a simple explanation for those scaling laws in cities based on the interaction range between the citizens and on the fractal properties of the cities. To this purpose, we introduced a measure of social potential which captured the influence of social interaction on the economic performance and the benefits of amenities in the case of infrastructure offered by the city...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28402870/long-chain-fatty-acid-feeding-frequency-in-anaerobic-codigestion-impacts-syntrophic-community-structure-and-biokinetics
#18
Ryan M Ziels, David A C Beck, H David Stensel
This study investigated the impacts of long-chain fatty acid (LCFA) feeding frequencies on microbial community structure, bioconversion kinetics, and process stability during anaerobic codigestion. Parallel laboratory-scale anaerobic codigesters fed with dairy cattle manure were either pulse-fed every two days or continuously-fed daily, respectively, with oleate (C18:1) in incremental step increases over 200 days up to 64% of the influent chemical oxygen demand (COD). The effluent acetate concentration exceeded 3000 mg/L in the continuous-fed codigester at the highest oleate loading rate, but remained below 100 mg/L in the pulse-fed codigester at the end of its 48-hr oleate feed cycle...
March 31, 2017: Water Research
https://www.readbyqxmd.com/read/28402537/performance-assessment-and-translation-of-physiologically-based-pharmacokinetic-models-from-acslx%C3%A2-to-berkeley-madonna%C3%A2-matlab%C3%A2-and-r-language-oxytetracycline-and-gold-nanoparticles-as-case-examples
#19
Zhoumeng Lin, Majid Jaberi-Douraki, Chunla He, Shiqiang Jin, Raymond S H Yang, Jeffrey W Fisher, Jim E Riviere
Many physiologically based pharmacokinetic (PBPK) models for environmental chemicals, drugs, and nanomaterials have been developed to aid risk and safety assessments using acslXTM. However, acslXTM has been rendered sunset since November 2015. Alternative modeling tools and tutorials are needed for future PBPK applications. This forum article aimed to: (1) demonstrate the performance of four PBPK modeling software packages (acslXTM, Berkeley MadonnaTM, MATLAB®, and R language) tested using two existing models (oxytetracycline and gold nanoparticles); (2) provide a tutorial of PBPK model code conversion from acslXTM to Berkeley MadonnaTM, MATLAB®, and R language; (3) discuss the advantages and disadvantages of each software package in the implementation of PBPK models in toxicology, and (4) share our perspective about future direction in this field...
April 8, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28400415/recombination-dependent-replication-and-gene-conversion-homogenize-repeat-sequences-and-diversify-plastid-genome-structure
#20
Tracey A Ruhlman, Jin Zhang, John C Blazier, Jamal S M Sabir, Robert K Jansen
PREMISE OF THE STUDY: There is a misinterpretation in the literature regarding the variable orientation of the small single copy region of plastid genomes (plastomes). The common phenomenon of small and large single copy inversion, hypothesized to occur through intramolecular recombination between inverted repeats (IR) in a circular, single unit-genome, in fact, more likely occurs through recombination-dependent replication (RDR) of linear plastome templates. If RDR can be primed through both intra- and intermolecular recombination, then this mechanism could not only create inversion isomers of so-called single copy regions, but also an array of alternative sequence arrangements...
April 11, 2017: American Journal of Botany
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