Search results for "filtered"

showing 10 items of 53 documents

Metabolomic by 1H NMR Spectroscopy Differentiates “Fiano Di Avellino” White Wines Obtained with Different Yeast Strains

2013

We employed (1)H NMR spectroscopy to examine the molecular profile of a white "Fiano di Avellino" wine obtained through fermentation by either a commercial or a selected autochthonous Saccharomyces cerevisiae yeast starter. The latter was isolated from the same grape variety used in the wine-making process in order to strengthen the relationship between wine molecular quality and its geographical origin. (1)H NMR spectra, where water and ethanol signals were suppressed by a presaturated T1-edited NMR pulse sequence, allowed for definition of the metabolic content of the two differently treated wines. Elaboration of NMR spectral data by multivariate statistical analyses showed that the two d…

Magnetic Resonance SpectroscopySettore AGR/13 - Chimica AgrariaWineBiologyMetabolomicsYeastsMetabolomicsVitisFood scienceWinemakingWineEthanoldigestive oral and skin physiologyfood and beveragesPulse sequenceGeneral ChemistryNuclear magnetic resonance spectroscopyYeastBiochemistryFermentationProton NMRFermentationnuclear magnetic resonance T1-filtered spectra autochthonous yeast starter “Fiano di Avellino” white wine metabolomic chemometric techniquesGeneral Agricultural and Biological SciencesSettore AGR/16 - Microbiologia AgrariaJournal of Agricultural and Food Chemistry
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Coronary CT angiography using iterative reconstruction 
vs. filtered back projection: evaluation of image quality.

2014

To compare image quality of iterative reconstruction algorithm(IRIS) vs. standard filtered back projection(FBP) reconstruction in CT Coronary Angiography (CTCA).Thirty-four consecutive patients underwent CTCA for suspected or known CAD with Dual-Source CT (DSCT-Flash, Siemens). All datasets were reconstructed with 0.75/0.4 and 0.6/0.4 mm slice thickness/increment, using three standard FBP kernels (B26-B30-B46) and three comparable IRIS algorithms (I26-I30-I46). Vascular attenuation and noise were measured. CT vascular attenuation values [HU] were measured in: ascending aorta (Ao), right (RCA) and left (LCA) coronary artery, respectively. Signal-to-noise (SNR) and contrast-to-noise (CNR) rat…

MaleImage Processing Computer-AssistedHumansFemaleCoronary Artery DiseaseProspective StudiesMiddle Agediterative reconstruction signal noise cardiac CT filtered back projectionSettore MED/36 - Diagnostica Per Immagini E RadioterapiaCoronary AngiographyTomography X-Ray ComputedAlgorithmsAged
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Second-harmonic Generation Microscopy of Carbon Nanotubes

2012

We image an individual single-walled carbon nanotube (SWNT) by second-harmonic generation (SHG) and transmission electron microscopy and propose that SHG microscopy could be used to probe the handedness of chiral SWNTs.

Materials sciencePhysics::Medical PhysicsPhysics::OpticsSecond-harmonic generationScanning gate microscopyNanotechnologyCarbon nanotubeSecond Harmonic Generation MicroscopyCondensed Matter::Mesoscopic Systems and Quantum Hall Effectlaw.inventionOptical properties of carbon nanotubesCondensed Matter::Materials ScienceTransmission electron microscopylawEnergy filtered transmission electron microscopyPhotoconductive atomic force microscopyConference on Lasers and Electro-Optics 2012
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Structural Characterization of Organics Using Manual and Automated Electron Diffraction

2010

In the last decade the importance of transmission electron microscopic studies has become increasingly important with respect to the characterization of organic materials, ranging from small organic molecules to polymers and biological macromolecules. This review will focus on the use of transmission electron microscope to perform electron crystallography experiments, detailing the approaches in acquiring electron crystallographic data. The traditional selected area approach and the recently developed method of automated diffraction tomography (ADT) will be discussed with special attention paid to the handling of electron beam sensitive organic materials.

Materials sciencePolymers and PlasticsRenewable Energy Sustainability and the EnvironmentElectron crystallographyBiomedical EngineeringCrystallographic dataNanotechnologyGeneral ChemistryElectronautomated data acquisition; electron diffraction; simulation methods; structure determinationsimulation methodsautomated data acquisitionstructure determinationElectronic Optical and Magnetic MaterialsCharacterization (materials science)Diffraction tomographyElectron diffractionTransmission electron microscopyMaterials ChemistryEnergy filtered transmission electron microscopyelectron diffractionElectrical and Electronic Engineering
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Total-scattering pair-distribution function of organic material from powder electron diffraction data.

2014

AbstractThis paper shows that pair-distribution function (PDF) analyses can be carried out on organic and organometallic compounds from powder electron diffraction data. Different experimental setups are demonstrated, including selected area electron diffraction and nanodiffraction in transmission electron microscopy or nanodiffraction in scanning transmission electron microscopy modes. The methods were demonstrated on organometallic complexes (chlorinated and unchlorinated copper phthalocyanine) and on purely organic compounds (quinacridone). The PDF curves from powder electron diffraction data, called ePDF, are in good agreement with PDF curves determined from X-ray powder data demonstrat…

Materials scienceReflection high-energy electron diffractionElectron diffractionGas electron diffractionScanning transmission electron microscopyAnalytical chemistryEnergy filtered transmission electron microscopySelected area diffractionInstrumentationPowder diffractionElectron backscatter diffractionMicroscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
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Structure analysis of side chain liquid crystal polymer films by means of electron microscopy

1987

Abstract Using the combined techniques of electron diffraction, bright and dark field electron microscopy as well as light microscopy, it has been possible to obtain detailed structural information about the arrangement of the smectic layers in a polymethacrylate side chain liquid crystal polymer with a biphenylester as the mesogenic group.

Materials scienceReflection high-energy electron diffractionbusiness.industryPolymer characterizationCryo-electron microscopyGeneral ChemistryCondensed Matter PhysicsDark field microscopyCondensed Matter::Soft Condensed MatterCrystallographyOpticsElectron diffractionLiquid crystalSide chainEnergy filtered transmission electron microscopyGeneral Materials SciencebusinessLiquid Crystals
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Comparison of the decameric structure of peroxiredoxin-II by transmission electron microscopy and X-ray crystallography

2001

Abstract The decameric human erythrocyte protein torin is identical to the thiol-specific antioxidant protein-II (TSA-II), also termed peroxiredoxin-II (Prx-II). Single particle analysis from electron micrographs of Prx-II molecules homogeneously orientated across holes in the presence of a thin film of ammonium molybdate and trehalose has facilitated the production of a ≥20 A 3-D reconstruction by angular reconstitution that emphasises the D5 symmetry of the ring-like decamer. The X-ray structure for Prx-II was fitted into the transmission electron microscopic reconstruction by molecular replacement. The surface-rendered transmission electron microscopy (TEM) reconstruction correlates well…

Models MolecularMolybdenumErythrocytesSurface PropertiesCryo-electron microscopyChemistryResolution (electron density)BiophysicsTrehaloseSingle particle analysisPeroxiredoxinsCrystallography X-RayBiochemistryNegative stainMicroscopy ElectronCrystallographyPeroxidasesElectron tomographyStructural BiologyTransmission electron microscopyHumansEnergy filtered transmission electron microscopyOrthorhombic crystal systemMolecular BiologyBiochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology
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The γ5-problem and anomalies — A Clifford algebra approach

1990

Abstract It is shown that a strong correspondence between noncyclicity and anomalies exists. This allows, by fundamental properties of Clifford algebras, to build a simple and consistent scheme for treating γ 5 without using ( d −4)-dimensional objects

PhysicsFiltered algebraNuclear and High Energy PhysicsMultivectorPure mathematicsGeometric algebraClassification of Clifford algebrasClifford algebraParavectorGamma matricesClifford analysisPhysics Letters B
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NONCOMMUTATIVE GEOMETRY AND GRADED ALGEBRAS IN ELECTROWEAK INTERACTIONS

1992

The Standard Model of Electroweak Interactions can be described by a generalized Yang-Mills field incorporating both the usual gauge bosons and the Higgs fields. The graded derivative by means of which the Yang-Mills field strength is constructed involves both a differential acting on space-time and a differential acting on an associative graded algebra of matrices. The square of the curvature for the corresponding covariant derivative yields the bosonic Lagrangian of the Standard Model. We show how to recover the whole fermionic part of the Standard Model in this framework. Quarks and leptons fit naturally into the smallest typical and nontypical irreducible representations of the graded …

PhysicsNuclear and High Energy PhysicsParticle physicsHigh Energy Physics::PhenomenologyGraded ringAstronomy and AstrophysicsLie superalgebraNoncommutative geometryAtomic and Molecular Physics and OpticsSuper-Poincaré algebraGraded Lie algebraFiltered algebraTheoretical physicsLie algebraAlgebra representationInternational Journal of Modern Physics A
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GRADED IDENTITIES FOR THE ALGEBRA OF n×n UPPER TRIANGULAR MATRICES OVER AN INFINITE FIELD

2003

We consider the algebra Un(K) of n×n upper triangular matrices over an infinite field K equipped with its usual ℤn-grading. We describe a basis of the ideal of the graded polynomial identities for this algebra.

PolynomialHilbert series and Hilbert polynomialMathematics::Commutative AlgebraGeneral MathematicsGraded ringTriangular matrixBasis (universal algebra)Graded Lie algebraFiltered algebraAlgebrasymbols.namesakeDifferential graded algebrasymbolsMathematicsInternational Journal of Algebra and Computation
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