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https://www.readbyqxmd.com/read/28728059/iterative-variational-mode-decomposition-based-automated-detection-of-glaucoma-using-fundus-images
#1
Shishir Maheshwari, Ram Bilas Pachori, Vivek Kanhangad, Sulatha V Bhandary, U Rajendra Acharya
Glaucoma is one of the leading causes of permanent vision loss. It is an ocular disorder caused by increased fluid pressure within the eye. The clinical methods available for the diagnosis of glaucoma require skilled supervision. They are manual, time consuming, and out of reach of common people. Hence, there is a need for an automated glaucoma diagnosis system for mass screening. In this paper, we present a novel method for an automated diagnosis of glaucoma using digital fundus images. Variational mode decomposition (VMD) method is used in an iterative manner for image decomposition...
June 19, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28727856/systematic-studies-of-the-interactions-between-a-model-polyphenol-compound-and-microbial-%C3%AE-glucosidases
#2
Viviam M da Silva, Juliana A P Sato, Juscemácia N Araujo, Fabio M Squina, João R C Muniz, Karin A Riske, Wanius Garcia
Lignin is a major obstacle for cost-effective conversion of cellulose into fermentable sugars. Non-productive adsorption onto insoluble lignin fragments and interactions with soluble phenols are important inhibition mechanisms of cellulases, including β-glucosidases. Here, we examined the inhibitory effect of tannic acid (TAN), a model polyphenolic compound, on β-glucosidases from the bacterium Thermotoga petrophila (TpBGL1 and TpBGL3) and archaeon Pyrococcus furiosus (PfBGL1). The results revealed that the inhibition effects on β-glucosidases were TAN concentration-dependent...
2017: PloS One
https://www.readbyqxmd.com/read/28727556/effective-screening-and-classification-of-cervical-precancer-biopsy-imagery
#3
Jaidip Jagtap, Nishigandha Patil, Abdul K Parchur, Chayanika Pantola, Asha Agarwal, Kiran Pandey, Asima Pradhan
Microscope images of biopsy samples of cervical precancers conventionally discriminated by histopathology, the current "gold standard" for cancer detection, showed that their correlation properties are segregated into different classes. The correlation domains clearly indicate increasing cellular clustering in different grades of precancer compared to their normal counterparts. This trend indicates the probability of pixel distribution of the corresponding tissue images. Because the cell density is not uniform in the higher grades, the skewness (asymmetry of a distribution), kurtosis (sharpness of a distribution), entropy (randomness), and standard deviation are affected...
July 18, 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28726675/sensitivity-of-magnetic-properties-to-chemical-pressure-in-lanthanide-garnets-i-ln-i-sub-3-sub-i-a-i-sub-2-sub-i-x-i-sub-3-sub-o-sub-12-sub-i-ln-i-gd-tb-dy-ho-i-a-i-ga-sc-in-te-i-x-i-ga-al-li
#4
Paromita Mukherjee, Alice C Sackville Hamilton, Hugh F J Glass, S E Dutton
A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets <i>Ln</i><sub>3</sub><i>A</i><sub>2</sub><i>X</i><sub>3</sub>O<sub>12</sub>, <i>Ln</i> = Gd, Tb, Dy, Ho, <i>A</i> = Ga, Sc, In, Te, <i>X</i> = Ga, Al, Li is presented. Garnets with <i>Ln</i> = Gd show magnetic behaviour consistent with isotropic Gd<sup>3+</sup> spins; no magnetic ordering is observed for <i>T</i> ≥ 0...
July 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28722821/sensory-strategies-of-postural-sway-during-quiet-stance-in-patients-with-haemophilic-arthropathy
#5
C Cruz-Montecinos, C De la Fuente, G Rivera-Lillo, S Morales-Castillo, V Soto-Arellano, F Querol, S Pérez-Alenda
INTRODUCTION: The sensory strategies of postural control in adult haemophilic arthropathy patients are still poorly understood. AIM: To determine sensorial posture-control strategies through postural sway frequency analysis when in a bipedal quiet stance with and without visual stimulus deprivation in healthy subjects and patients with haemophilic arthropathy. Secondarily, to determine the irregularity of postural balance control through sample entropy (SampEn)...
July 19, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28722130/solubility-and-molecular-interactions-of-ferulic-acid-in-various-isopropanol%C3%A2-%C3%A2-water-mixtures
#6
Nazrul Haq, Nasir A Siddiqui, Faiyaz Shakeel
OBJECTIVE: The solubility of an herbal compound ferulic acid (FA) in various (isopropanol (IPA) + water) mixtures was measured and correlated at temperatures 'T = 298.2 K to 318.2 K' and pressure 'p = 0.1 MPa'. METHODS: The experimental solubilities of FA in mole fraction were determined using a static equilibrium method and correlated with 'Apelblat, Van't Hoff, Yalkowsky and Jouyban-Acree models'. KEY FINDINGS: The maximum mole fraction solubilities of FA were obtained in neat IPA (2...
July 19, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28722064/effect-of-alkyl-branches-on-the-thermal-stability-of-quaternary-ammonium-cations-in-organic-electrolytes-for-electrochemical-double-layer-capacitors
#7
Yong Nam Ahn, Sung Hoon Lee, Goo Soo Lee, Hyunbin Kim
Quaternary ammoniums are cations having widespread use in organic electrolytes for high performance electrochemical double layer capacitors (EDLCs) due to their various advantages such as high electrochemical stability and inexpensive production cost. However, the decomposition of quaternary ammoniums via Hofmann elimination hinders their applications for EDLCs operating at elevated temperatures. This study systematically investigates the reactivity of four different quaternary ammoniums (tetraethyl-, triethylmethyl-, diethyldimethyl-, and trimethylethyl-ammonium) in EDLC by utilizing density functional theory calculations and Brownian dynamics simulations complemented with molecular dynamics simulations...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28720852/quantum-critical-scaling-under-periodic-driving
#8
Salvatore Lorenzo, Jamir Marino, Francesco Plastina, G Massimo Palma, Tony J G Apollaro
Universality is key to the theory of phase transitions, stating that the equilibrium properties of observables near a phase transition can be classified according to few critical exponents. These exponents rule an universal scaling behaviour that witnesses the irrelevance of the model's microscopic details at criticality. Here we discuss the persistence of such a scaling in a one-dimensional quantum Ising model under sinusoidal modulation in time of its transverse magnetic field. We show that scaling of various quantities (concurrence, entanglement entropy, magnetic and fidelity susceptibility) endures up to a stroboscopic time τ bd , proportional to the size of the system...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28718773/mouse-epileptic-seizure-detection-with-multiple-eeg-features-and-simple-thresholding-technique
#9
Quang M Tieng, Ashwin Anbazhagan, Min Chen, David Charles Reutens
Epilepsy is a common neurological disorder characterized by recurrent, unprovoked seizures. The search for new treatments for seizures and epilepsy relies upon studies in animal models of epilepsy. To capture data on seizures, many applications require prolonged electroencephalography (EEG) with recordings that generate voluminous data. The desire for efficient evaluation of these recordings motivates the development of automated seizure detection algorithms. Approach: A new seizure detection method is proposed, based on multiple features and a simple thresholding technique...
July 18, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28718465/structure-and-molecular-packing-in-smectic-bcr-and-ad-phases-of-schiff-base-liquid-crystal-compounds-through-the-analyses-of-layer-spacing-entropy-and-crystal-structure
#10
Yasuhisa Yamamura, Takahito Murakoshi, Sakiko Iwagaki, Natalia Osiecka, Hideki Saitoh, Mafumi Hishida, Zbigniew Galewski, Maria Massalska-Arodź, Kazuya Saito
Single-crystal structural analyses and heat capacity measurements were performed on two Schiff base liquid crystal compounds, 5CBAA (4-chlorobenzylidene-4'-pentyloxyaniline) and 5ABCA (4-pentyloxybenzylidene-4'-chloroaniline). The alkyloxy-chain of a 5CBAA molecule was conformationally ordered in the crystal at room temperature. While that of 5ABCA was partially disordered in the room temperature phase but ordered in a low-temperature phase at 100 K. The structural phase transition involving the disordering of the conformation was observed at 107 K in the heat capacity of 5ABCA...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718453/analysis-of-tcspc-data-a-comparative-evaluation-of-deterministic-and-probabilistic-approaches
#11
Darren Andrew Smith, Grant McKenzie, Anita C Jones, Trevor Smith
We review various methods for analysing time-resolved fluorescence data acquired using the time-correlated single photon counting (TCSPC) method in an attempt to evaluate their benefits and limitations. We have applied these methods to both experimental and simulated data. The relative merits of using deterministic approaches, such as the commonly used iterative reconvolution method, and probabilistic approaches, such as the smoothed exponential series method (SESM), the maximum entropy method (MEM) and recently proposed basis pursuit denoising (BPDN, compressed sensing) method are outlined...
July 18, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28717134/ash-production-by-attrition-in-volcanic-conduits-and-plumes
#12
T J Jones, J K Russell
Tephra deposits result from explosive volcanic eruption and serve as indirect probes into fragmentation processes operating in subsurface volcanic conduits. Primary magmatic fragmentation creates a population of pyroclasts through volatile-driven decompression during conduit ascent. In this study, we explore the role that secondary fragmentation, specifically attrition, has in transforming primary pyroclasts upon transport in volcanic conduits and plumes. We utilize total grain size distributions from a suite of natural and experimentally produced tephra to show that attrition is likely to occur in all explosive volcanic eruptions...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716196/maximum-entropy-modeling-risk-of-anthrax-in-the-republic-of-kazakhstan
#13
S K Abdrakhmanov, Y Y Mukhanbetkaliyev, F I Korennoy, A A Sultanov, A S Kadyrov, D B Kushubaev, T G Bakishev
The objective of this study was to zone the territory of the Republic of Kazakhstan (RK) into risk categories according to the probability of anthrax emergence in farm animals as stipulated by the re-activation of preserved natural foci. We used historical data on anthrax morbidity in farm animals during the period 1933 - 2014, collected by the veterinary service of the RK. The database covers the entire territory of the RK and contains 4058 anthrax outbreaks tied to 1798 unique locations. Considering the strongly pronounced natural focality of anthrax, we employed environmental niche modeling (Maxent) to reveal patterns in the outbreaks' linkages to specific combinations of environmental factors...
September 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28715681/adsorption-of-nh4-n-on-chinese-loess-non-equilibrium-and-equilibrium-investigations
#14
Haijian Xie, Shaoyi Wang, Zhanhong Qiu, Jianqun Jiang
NH4(+)-N is a crucial pollutant in landfill leachate and can be in high concentrations for a long period of time due to anaerobic condition of landfills. The adsorption properties of NH4(+)-N on the Chinese loess were investigated using Batch test. The influences of ammonium concentration, temperature, reaction time, slurry concentration, and pH on the adsorption process are evaluated. Adsorption kinetics and isotherm behaviors were studied by applying different models to the test data to determine the adsorption parameters...
July 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28715635/redox-potentials-from-ab-initio-molecular-dynamics-and-explicit-entropy-calculations-application-to-transition-metals-in-aqueous-solution
#15
Miguel A Caro, Olga Lopez-Acevedo, Tomi Laurila
We present a complete methodology to consistently estimate redox potentials strictly from first principles, without any experimental input. The methodology is based on (i) ab initio molecular dynamics (MD) simulations, (ii) all-atom explicit solvation, (iii) the two-phase thermodynamic (2PT) model and (iv) the use of electrostatic potentials as references for the absolute electrochemical scale. We apply the approach presented to compute reduction potentials of the following redox couples: Cr(+2/+3), V(+2/+3), Ru(NH3)6(+2/+3), Sn(+2/+4), Cu(+1/+2), FcMeOH(0/+1) and Fe(+2/+3) (in aqueous solution) and Fc(0/+1) (in acetonitrile)...
July 17, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28711759/dft-study-of-the-interaction-between-dota-chelator-and-competitive-alkali-metal-ions
#16
E Frimpong, A A Skelton, B Honarparvar
1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetracetic acid (DOTA) is an important chelator for radiolabeling of pharmaceuticals. The ability of alkali metals found in the body to complex with DOTA and compete with radio metal ions can alter the radiolabeling process. Non-covalent interactions between DOTA complexed with alkali metals Li(+), Na(+), K(+) and Rb(+), are investigated with density functional theory using B3LYP and ωB97XD functionals. Conformational possibilities of DOTA were explored with a varying number of carboxylic pendant arms of DOTA in close proximity to the ions...
June 29, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28711039/determination-of-onset-temperature-from-the-entropy-for-fragile-to-strong-liquids
#17
Atreyee Banerjee, Manoj Kumar Nandi, Srikanth Sastry, Sarika Maitra Bhattacharyya
In this paper, we establish a connection between the onset temperature of glassy dynamics with the change in the entropy for a wide range of model systems. We identify the crossing temperature of pair and excess entropies as the onset temperature. Below the onset temperature, the residual multiparticle entropy, the difference between excess and pair entropies, becomes positive. The positive entropy can be viewed as equivalent to the larger phase space exploration of the system. The new method of onset temperature prediction from entropy is less ambiguous, as it does not depend on any fitting parameter like the existing methods...
July 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28710571/thermodynamic-dft-analysis-of-natural-gas
#18
Abel F G Neto, Muhammad N Huda, Francisco C Marques, Rosivaldo S Borges, Antonio M J C Neto
Density functional theory was performed for thermodynamic predictions on natural gas, whose B3LYP/6-311++G(d,p), B3LYP/6-31+G(d), CBS-QB3, G3, and G4 methods were applied. Additionally, we carried out thermodynamic predictions using G3/G4 averaged. The calculations were performed for each major component of seven kinds of natural gas and to their respective air + natural gas mixtures at a thermal equilibrium between room temperature and the initial temperature of a combustion chamber during the injection stage...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28709365/work-extraction-in-an-isolated-quantum-lattice-system-grand-canonical-and-generalized-gibbs-ensemble-predictions
#19
Ranjan Modak, Marcos Rigol
We study work extraction (defined as the difference between the initial and the final energy) in noninteracting and (effectively) weakly interacting isolated fermionic quantum lattice systems in one dimension, which undergo a sequence of quenches and equilibration. The systems are divided in two parts, which we identify as the subsystem of interest and the bath. We extract work by quenching the on-site potentials in the subsystem, letting the entire system equilibrate, and returning to the initial parameters in the subsystem using a quasistatic process (the bath is never acted upon)...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709349/influence-of-measurement-error-on-maxwell-s-demon
#20
Vegard Sørdal, Joakim Bergli, Y M Galperin
In any general cycle of measurement, feedback, and erasure, the measurement will reduce the entropy of the system when information about the state is obtained, while erasure, according to Landauer's principle, is accompanied by a corresponding increase in entropy due to the compression of logical and physical phase space. The total process can in principle be fully reversible. A measurement error reduces the information obtained and the entropy decrease in the system. The erasure still gives the same increase in entropy, and the total process is irreversible...
June 2017: Physical Review. E
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