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https://www.readbyqxmd.com/read/29331424/ultra-narrow-surface-lattice-resonances-in-plasmonic-metamaterial-arrays-for-biosensing-applications
#1
Artem Danilov, Gleb Tselikov, Fan Wu, Vasyl G Kravets, Igor Ozerov, Frederic Bedu, Alexander N Grigorenko, Andrei V Kabashin
When excited over a periodic metamaterial lattice of gold nanoparticles (~ 100nm), localized plasmon resonances (LPR) can be coupled by a diffraction wave propagating along the array plane, which leads to a drastic narrowing of plasmon resonance lineshapes (down to a few nm full-width-at-half-maximum) and the generation of singularities of phase of reflected light. These phenomena look very promising for the improvement of performance of plasmonic biosensors, but conditions of implementation of such diffractively coupled plasmonic resonances, also referred to as plasmonic surface lattice resonances (PSLR), are not always compatible with biosensing arrangement implying the placement of the nanoparticles between a glass substrate and a sample medium (air, water)...
December 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29330332/identification-and-characterization-of-sites-where-persistent-atrial-fibrillation-is-terminated-by-localized-ablation
#2
Junaid A B Zaman, William H Sauer, Mahmood I Alhusseini, Tina Baykaner, Ryan T Borne, Christopher A B Kowalewski, Sonia Busch, Paul C Zei, Shirley Park, Mohan N Viswanathan, Paul J Wang, Johannes Brachmann, David E Krummen, John M Miller, Wouter Jan Rappel, Sanjiv M Narayan, Nicholas S Peters
BACKGROUND: The mechanisms by which persistent atrial fibrillation (AF) terminates via localized ablation are not well understood. To address the hypothesis that sites where localized ablation terminates persistent AF have characteristics identifiable with activation mapping during AF, we systematically examined activation patterns acquired only in cases of unequivocal termination by ablation. METHODS AND RESULTS: We recruited 57 patients with persistent AF undergoing ablation, in whom localized ablation terminated AF to sinus rhythm or organized tachycardia...
January 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29330056/growth-scaling-for-the-early-dynamics-of-hiv-aids-epidemics-in-brazil-and-the-influence-of-socio-demographic-factors
#3
L Dinh, G Chowell, R Rothenberg
The early dynamics of an infectious disease outbreak can be affected by various factors including the transmission mode of the disease and host-specific factors. While recent works have highlighted the presence of sub-exponential growth patterns during the early phase of epidemics, empirical studies examining the contribution of different factors to early epidemic growth dynamics are lacking. Here we aim to characterize and explain the early incidence growth patterns of local HIV/AIDS epidemics in Brazil as a function of socio-demographic factors...
January 9, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29329939/enhanced-mobility-of-non-aqueous-phase-liquid-napl-during-drying-of-wet-sand
#4
Dhivakar Govindarajan, Abhijit P Deshpande, Ravikrishna Raghunathan
Enhanced upward mobility of a non aqueous phase liquid (NAPL) present in wet sand during natural drying, and in the absence of any external pressure gradients, is reported for the first time. This mobility was significantly higher than that expected from capillary rise. Experiments were performed in a glass column with a small layer of NAPL-saturated sand trapped between two layers of water-saturated sand. Drying of the wet sand was induced by flow of air across the top surface of the wet sand. The upward movement of the NAPL, in the direction of water transport, commenced when the drying effect reached the location of the NAPL and continued as long as there was significant water evaporation in the vicinity of NAPL, indicating a clear correlation between the NAPL rise and water evaporation...
January 4, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29329214/analysis-of-emission-effects-related-to-drivers-compliance-rates-for-cooperative-vehicle-infrastructure-system-at-signalized-intersections
#5
Ruohua Liao, Xumei Chen, Lei Yu, Xiaofei Sun
Unknown remaining time of signal phase at a signalized intersection generally results in extra accelerations and decelerations that increase variations of operating conditions and thus emissions. A cooperative vehicle-infrastructure system can reduce unnecessary speed changes by establishing communications between vehicles and the signal infrastructure. However, the environmental benefits largely depend on drivers' compliance behaviors. To quantify the effects of drivers' compliance rates on emissions, this study applied VISSIM 5...
January 12, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29329090/simultaneous-accelerated-solvent-extraction-and-hydrolysis-of-11-nor-%C3%AE-9-tetrahydrocannabinol-9-carboxylic-acid-glucuronide-in-meconium-samples-for-gas-chromatography-mass-spectrometry-analysis
#6
Cinthia de Carvalho Mantovani, Jefferson Pereira E Silva, Guilherme Forster, Rafael Menck de Almeida, Edna Maria de Albuquerque Diniz, Mauricio Yonamine
Cannabis misuse during pregnancy is associated with severe impacts on the mother and baby health, such as newborn low birth weight, growth restriction, pre-term birth, neurobehavioral and developmental deficits. In most of the cases, drug abuse is omitted or denied by the mothers. Thus, toxicological analyzes using maternal-fetal matrices takes place as a suitable tool to assess drug use. Herein, meconium was the chosen matrix to evaluate cannabis exposure through identification and quantification of 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic (THCCOOH)...
January 7, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29329062/amygdala-response-to-emotional-faces-in-seasonal-affective-disorder
#7
Camilla Borgsted, Brice Ozenne, Brenda Mc Mahon, Martin K Madsen, Liv V Hjordt, Ida Hageman, William F C Baaré, Gitte M Knudsen, Patrick M Fisher
BACKGROUND: Seasonal affective disorder (SAD) is characterized by seasonally recurring depression. Heightened amygdala activation to aversive stimuli is associated with major depressive disorder but its relation to SAD is unclear. We evaluated seasonal variation in amygdala activation in SAD and healthy controls (HC) using a longitudinal design targeting the asymptomatic/symptomatic phases of SAD. We hypothesized increased amygdala activation to aversive stimuli in the winter in SAD individuals (season-by-group interaction)...
January 3, 2018: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29328323/long-range-distributed-optical-fiber-hot-wire-anemometer-based-on-chirped-pulse-%C3%AE-otdr
#8
Andres Garcia-Ruiz, Alejandro Dominguez-Lopez, Juan Pastor-Graells, Hugo F Martins, Sonia Martin-Lopez, Miguel Gonzalez-Herraez
We demonstrate a technique allowing to develop a fully distributed optical fiber hot-wire anemometer capable of reaching a wind speed uncertainty of ≈ ±0.15m/s (±0.54km/h) at only 60 mW/m of dissipated power in the sensing fiber, and within only four minutes of measurement time. This corresponds to similar uncertainty values than previous papers on distributed optical fiber anemometry but requires two orders of magnitude smaller dissipated power and covers at least one order of magnitude longer distance...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328322/anti-dispersion-phase-tunable-microwave-mixer-based-on-a-dual-drive-dual-parallel-mach-zehnder-modulator
#9
Mutong Xie, Mingyang Zhao, Mingzheng Lei, Yongle Wu, Yuanan Liu, Xinlu Gao, Shanguo Huang
An optically-controlled phase-tunable microwave mixer based on a dual-drive dual-parallel Mach-Zehnder modulator (DDDP-MZM) is proposed, which supports wideband phase shift and immunity to power fading caused by chromatic dispersion. By using carrier-suppressed single side-band (CS-SSB) modulation for the local oscillator (LO) signal and carrier-suppressed double side-band (CS-DSB) modulation for the input signal, no vector superposition for the same output microwave frequency occurs, making the system immune from power fading caused by chromatic dispersion...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328145/iterative-pixelwise-approach-applied-to-computer-generated-holograms-and-diffractive-optical-elements
#10
Wei-Feng Hsu, Shih-Chih Lin
This paper presents a novel approach to optimizing the design of phase-only computer-generated holograms (CGH) for the creation of binary images in an optical Fourier transform system. Optimization begins by selecting an image pixel with a temporal change in amplitude. The modulated image function undergoes an inverse Fourier transform followed by the imposition of a CGH constraint and the Fourier transform to yield an image function associated with the change in amplitude of the selected pixel. In iterations where the quality of the image is improved, that image function is adopted as the input for the next iteration...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328048/a-biomechanical-modeling-guided-simultaneous-motion-estimation-and-image-reconstruction-technique-smeir-bio-for-4d-cbct-reconstruction
#11
Xiaokun Huang, You Zhang, Jing Wang
Reconstructing four-dimensional cone-beam computed tomography (4D-CBCT) images directly from respiratory phase-sorted traditional 3D-CBCT projections can capture target motion trajectory, reduce motion artifacts, and reduce imaging dose and time. However, the limited numbers of projections in each phase after phase-sorting decreases CBCT image quality under traditional reconstruction techniques. To address this problem, we developed a simultaneous motion estimation and image reconstruction (SMEIR) algorithm, an iterative method that can reconstruct higher quality 4D-CBCT images from limited projections using an inter-phase intensity-driven motion model...
January 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29328024/endometrial-polyps-in-women-of-reproductive-age-clinical-and-pathogene-tic-variations
#12
N Kosei, N Zakharenko, D Herman
The aim of the study was to study the relationship between the morphofunctional characteristics of the endometrium, hormonal homeostasis and microbiocenosis of the reproductive system in patients with endometrial polyps. The study involved 130 patients aged 18-35 years: 34 patients with endometrial polyps, 30 patients with micropolyps, 36 patients with endometrial polyps and micropolyps, 30 healthy women of the control group. Hysteroscopy was performed for women who had been suspected for endometrial polyps and who had infertility or repeated recurrent miscarriages...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29327923/aliovalent-cation-substitution-in-uo2-electronic-and-local-structures-of-u1-ylayo2%C3%A2-x-solid-solutions
#13
Damien Prieur, Laura Martel, Jean-François Vigier, Andreas C Scheinost, Kristina O Kvashnina, Joseph Somers, Philippe M Martin
For nuclear fuel related applications, the oxygen stoichiometry of mixed oxides U1-yMyO2±x is an essential property as it affects fuel properties and may endanger the safe operation of nuclear reactors. A careful review of the open literature indicates that this parameter is difficult to assess properly and that the nature of the defects, i.e., oxygen vacancies or UV, in aliovalent cation-doped UO2 is still subject to controversy. To confirm the formation of UV, we have investigated the room-temperature stable U1-yLayO2±x phase using several experimental methods (e...
January 12, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29327823/a-previous-hamstring-injury-affects-kicking-mechanics-in-soccer-players
#14
Archit Navandar, Santiago Veiga, Gonzalo Torres, David Chorro, Enrique Navarro
BACKGROUND: Although the kicking skill is influenced by limb dominance and sex, how a previous hamstring injury affects kicking has not been studied in detail. Thus, the objective of this study was to evaluate the effect of sex and limb dominance on kicking in limbs with and without a previous hamstring injury. METHODS: 45 professional players (males: n=19, previously injured players=4, age=21.16 ± 2.00 years; females: n=19, previously injured players=10, age=22...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29327630/the-specter-of-the-primitive
#15
Gregory S Rizzolo
Traditional psychoanalytic theories of development hold that the adult neurotic can regress, or has already regressed, to the childhood arrests and/or fixations in which his pathology originated. More recent critiques have called this possibility into question. It is unlikely that anyone can roll back the additions and modifications of lifespan development in a full-fledged return to the needs, wishes, and anxieties of childhood. By regression, though, some analysts mean not a full-fledged return to an earlier developmental phase, but a non-phase-specific slip into primitive fantasies and defenses...
December 2017: Journal of the American Psychoanalytic Association
https://www.readbyqxmd.com/read/29323542/the-comparative-efficacy-of-brodalumab-in-patients-with-moderate-to-severe-psoriasis-a-systematic-literature-review-and-network-meta-analysis
#16
Laura Sawyer, Iain Fotheringham, Emily Wright, Najeeda Yasmeen, Carl Gibbons, Anders Holmen Møller
PURPOSE: To evaluate the relative efficacy of brodalumab compared with approved biologic therapies and apremilast for moderate-to-severe psoriasis. METHODS: We searched MEDLINE, Embase and Cochrane for randomized controlled trials reporting induction phase responses. The primary analysis examined the proportion of patients achieving Psoriasis Area Severity Index (PASI) 50, 75, 90 or 100 responses using a random-effects Bayesian multinomial likelihood model with probit link, with and without adjustment for variation in study-level placebo responses...
January 11, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29323284/phases-and-rates-of-iron-and-magnetism-changes-during-paddy-soil-development-on-calcareous-marine-sediment-and-acid-quaternary-red-clay
#17
Laiming Huang, Xiaoxu Jia, Ming'an Shao, Liumei Chen, Guangzhong Han, Ganlin Zhang
Dynamic changes in Fe oxides and magnetic properties during natural pedogenesis are well documented, but variations and controls of Fe and magnetism changes during anthropedogenesis of paddy soils strongly affected by human activities remain poorly understood. We investigated temporal changes in different Fe pools and magnetic parameters in soil profiles from two contrasting paddy soil chronosequences developed on calcareous marine sediment and acid Quaternary red clay in Southern China to understand the directions, phases and rates of Fe and magnetism evolution in Anthrosols...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29323250/a-biofilm-and-organomineralisation-model-for-the-growth-and-limiting-size-of-ooids
#18
Murray T Batchelor, Robert V Burne, Bruce I Henry, Fei Li, Josef Paul
Ooids are typically spherical sediment grains characterised by concentric layers encapsulating a core. There is no universally accepted explanation for ooid genesis, though factors such as agitation, abiotic and/or microbial mineralisation and size limitation have been variously invoked. Here we examine the possible influence of microbial organomineralisation on the formation of some naturally occurring ooids. We develop a mathematical model for ooid growth, inspired by work on avascular brain tumours, that assumes mineralisation in a biofilm to form a central core which then nucleates the progressive growth of concentric laminations...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29322560/fast-nonlinear-susceptibility-inversion-with-variational-regularization
#19
Carlos Milovic, Berkin Bilgic, Bo Zhao, Julio Acosta-Cabronero, Cristian Tejos
PURPOSE: Quantitative susceptibility mapping can be performed through the minimization of a function consisting of data fidelity and regularization terms. For data consistency, a Gaussian-phase noise distribution is often assumed, which breaks down when the signal-to-noise ratio is low. A previously proposed alternative is to use a nonlinear data fidelity term, which reduces streaking artifacts, mitigates noise amplification, and results in more accurate susceptibility estimates. We hereby present a novel algorithm that solves the nonlinear functional while achieving computation speeds comparable to those for a linear formulation...
January 10, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29321796/heart-rate-variability-a-new-tool-to-predict-complications-in-adult-cardiac-surgery
#20
Antonio Nenna, Mario Lusini, Cristiano Spadaccio, Francesco Nappi, Salvatore Matteo Greco, Raffaele Barbato, Elvio Covino, Massimo Chello
Heart rate variability (HRV) refers to the variations between consecutive heartbeats, which depend on the continuous modulation of the sympathetic and parasympathetic branches of the autonomic nervous system. HRV has been shown to be effective as a predictor of risk after myocardial infarction and an early warning sign of diabetic neuropathy, and in the cardiology setting is now recognized to be a useful tool for risk-stratification after hospital admission and after discharge. Recent evidences suggest that HRV analysis might predict complications even in patients undergoing cardiac surgery, and the present review summarizes the importance of HRV analysis in adult cardiac surgery and the perspectives for HRV use in current clinical practice...
November 2017: Journal of Geriatric Cardiology: JGC
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