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NMR Metabolomics Show Evidence for Mitochondrial Oxidative Stress in a Mouse Model of Polycystic Ovary Syndrome (2015)

Ebru Selin Selen, Zeinab Bolandnazar, Marco Tonelli, Daniel E. Bütz, Julia A. Haviland, Warren P. Porter and Fariba M. Assadi-Porter

American Chemical Society (ACS)

In: Journal of Proteome Research

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Publikationsdatum: 2015-07-07

Beschreibung: Journal of Proteome Research DOI: 10.1021/acs.jproteome.5b00307

Print ISSN: 1535-3893

Digitale ISSN: 1535-3907

Thema: Chemie und Pharmazie

Publiziert von American Chemical Society (ACS)

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BBC microcomputer controlled field inversion gel electrophoresis (1988)

Porter, C.D. ; Porter, A.G.F. ; Archard, L.C.

Oxford University Press

In: Bioinformatics. 1988; 4(2): 271-273. Published 1988 Jan 01. doi: 10.1093/bioinformatics/4.2.271.

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Publikationsdatum: 1988-01-01

Print ISSN: 1367-4803

Digitale ISSN: 1460-2059

Thema: Biologie , Informatik , Medizin

Publiziert von Oxford University Press

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Crystal/chemical structures and magnetic properties of naturally occurring Mn1.7Fe1.3O4 (1988)

Evans, B. J. ; Dunham, W. R. ; Porter, C. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 63 (1988), S. 4133-4135

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: An unusually pure Mnx Fe3−x O4 sample (x(approximately-equal-to)1.3) from a regionally metamorphosed ore body is expected to exhibit an approach to thermodynamic equilibrium unattainable in synthetic materials. This expectation is confirmed by the observation of (1) a small tetragonal distortion and (2) a complete ordering of Fe on the B sublattice. 57Fe Mössbauer spectra, obtained at 298, 175, 125, and 92 K and in an external field of 30 kG at 92 K, exhibit magnetic hyperfine splitting requiring the fitting of two subspectra, I and II. At 298 K, Heff =418 kOe, α=0.36 mm s−1 , and ε≈0 for the more intense subspectrum I, whereas for II Heff =403 kOe, δ=0.34 mm s−1 , and ε(approximately-equal-to)−0.15 mm s−1 . The two subspectra are not split by a 30 kG external field. Subspectra I and II correspond to Fe3+ ions located on a single magnetic sublattice. Subspectrum II is assigned to Fe3+ ions in regions with locally, large tetragonal distortions as a consequence of Mn3+clustering, which has often been invoked to explain the crystal chemistry and physical properties of Mnx Fe3−x O4 .

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.340519

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Microstructurally engineered, optically transmissive, electrically conductive metal films (1986)

Aspnes, D. E. ; Heller, A. ; Porter, J. D.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 60 (1986), S. 3028-3034

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Using standard multilayer and effective medium models, we determine microstructures that optimize the near-IR-visible normal-incidence optical transmittance of electrically conducting metal films intended for use as semitransparent contacts for semiconductor devices such as photodetectors or photoelectrochemical converters. Various conditions are considered, including unpolarized and linearly polarized light and electrical conduction both parallel and perpendicular to the surface. For linearly polarized light, the optimum microstructure consists of parallel metal lines of nominally square cross section oriented perpendicular to the polarization vector of the incident light, regardless of the direction of electrical conduction. The line separation and cross-sectional dimensions must both be small compared to the wavelength λ. For unpolarized radiation, the optimum microstructure depends on the direction of electrical conduction. For conduction parallel to the surface, the optimum microstructure again consists of parallel lines with the lines oriented perpendicular to the residual linear polarization, if any, of the incident flux. For conduction perpendicular to the surface, the optimum microstructure consists of cylindrical metal posts of dimension small compared to λ. Expressions are derived that allow the thicknesses and refractive indices of protective antireflection coatings to be calculated to first order in the thicknesses of the metal films. The more general case of antireflection coatings for anisotropic structures is briefly discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.337757

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The spectrum of highly ionized praseodymium and dysprosium from the Texas tokamak plasma in the 50–250-A(ring) range (1986)

Finkenthal, M. ; Lippmann, A. S. ; Huang, L. K. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 59 (1986), S. 3644-3649

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Spectra of highly ionized praseodymium and dysprosium recorded from the Texas tokamak (TEXT) plasma have been analyzed in the 50–250-A(ring) range. The spectra contain high-intensity continuum bands in the region below 100 A(ring) and bright individual lines above this wavelength. Lines of highly ionized praseodymium and dysprosium have been identified. The highest ionization state reached in the 1-keV central electron temperature tokamak plasma was Cu i-like Pr xxxi. The composition of the bands is explained in terms of a new theoretical approach developed to treat large unresolved transition arrays. The brightness of the continuum is compared with that of intense spectral lines emitted in the same wavelength range.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.336744

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Thermal stability and contact degradation mechanisms of TaC ohmic contacts with W/WC overlayers to n-type 6H SiC (2001)

Jang, T. ; Odekirk, B. ; Madsen, L. D. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 90 (2001), S. 4555-4559

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Ohmic contacts comprised of the layer sequence of W/WC/TaC/SiC showed excellent thermal stability after testing at 600 °C for 1000 h. No degradation of the specific contact resistance nor a reaction of the film with the SiC substrate was observed. From Auger electron spectroscopy depth profiles, it was found that W and WC reacted to form W2C on TaC after annealing. After annealing for several hundred hours at 1000 °C, the specific contact resistance of the W/WC/TaC/SiC contacts displayed noticeable degradation. According to secondary ion mass spectrometry (SIMS) analysis, after annealing at 1000 °C for 600 h, small but measurable changes in the electrical characteristics were associated with O incorporation at the interface between TaC and SiC. Investigation of the W/WC/TaC/SiC interface by transmission electron microscopy (TEM) indicated that a reaction between the W and WC had occurred, but there was no observed reaction with the SiC substrate. After annealing for 1000 h, substantial changes in the chemistry, the microstructure, the specific contact resistance, and the spreading resistance of the contacts were observed. To understand the mechanisms associated with the degradation of the electrical properties, SIMS and TEM analyses were performed on samples annealed for 600, 700, 800, 900, and 1000 h at 1000 °C. These findings indicated that both oxidation and metallurgical reactions played important roles in the degradation of the electrical properties. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1407316

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Generalization of a two-dimensional micromagnetic model to nonuniform thickness (2001)

Porter, D. G. ; Donahue, M. J.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 7257-7259

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A two-dimensional micromagnetic model is extended to support simulation of films with nonuniform thickness. Zeeman and crystalline anisotropy energies of each cell scale with the cell thickness, while the exchange energy of a pair of neighbor cells scales by a weight dependent on the thicknesses of both cells. The self-magnetostatic energy is computed by scaling the moment of each cell by its thickness, and adding a local correction to the out-of-plane field. The calculation of the magnetostatic field for a 10×10×1 oblate spheroid is shown to be more accurate by the nonuniform thickness model than by a uniform thickness model. With the extended model a 530×130×10 nm film in the shape of a truncated pyramid with tapering over the 15 nm nearest the edges is shown to have smaller switching field and different reversal mechanism compared with uniform thickness films of similar size and shape. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1363606

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Switching dynamics and critical behavior of standard problem No. 4 (2001)

McMichael, R. D. ; Donahue, M. J. ; Porter, D. G.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 7603-7605

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We report results for μMAG standard problem No. 4, a 500 nm×125 nm×3 nm rectangle of material with properties to mimic Permalloy. Switching dynamics are calculated for fields applied instantaneously to an initial s state: Field 1 at 170° and Field 2 at 190° (−170°) from the positive long axis. Reversal in Field 1 proceeds by propagation of end domains toward the sample center. Reversal in Field 2 involves rotation of the end domains in one direction while the center of the particle rotates in the opposite direction, resulting in collapsing 360° walls with complex dynamics on fine length scales. Approaching the static coercivity, Hc, in small field steps, we find that the ring down frequency, f, and susceptibility, χ, are in approximate agreement with a single spin model that predicts f∝(Hc−H)1/4 and χ∝(Hc−H)−1/2. We show a correlation between the modes of oscillation that become unstable at the critical field and the switching behavior. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1355356

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Behavior of μMAG standard problem No. 2 in the small particle limit (2000)

Donahue, M. J. ; Porter, D. G. ; McMichael, R. D.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 5520-5522

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be Hc/Ms=0.057069478 and Hs/Ms=0.057142805. Previous micromagnetic computations of coercive and switching fields that did not approach these values for small particles are analyzed. It is shown that the disagreement was primarily due to a disparity in the method of calculating demagnetization energy. Corrected simulations are shown to agree with analytically determined values. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.373391

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Diagnostics on Z (invited) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)

Nash, T. J. ; Derzon, M. S. ; Chandler, G. A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 72 (2001), S. 1167-1172

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: The 100 ns, 20 MA pinch-driver Z is surrounded by an extensive set of diagnostics. There are nine radial lines of sight set at 12° above horizontal and each of these may be equipped with up to five diagnostic ports. Instruments routinely fielded viewing the pinch from the side with these ports include x-ray diode arrays, photoconducting detector arrays, bolometers, transmission grating spectrometers, time-resolved x-ray pinhole cameras, x-ray crystal spectrometers, calorimeters, silicon photodiodes, and neutron detectors. A diagnostic package fielded on axis for viewing internal pinch radiation consists of nine lines of sight. This package accommodates virtually the same diagnostics as the radial ports. Other diagnostics not fielded on the axial or radial ports include current B-dot monitors, filtered x-ray scintillators coupled by fiber optics to streak cameras, streaked visible spectroscopy, velocity interferometric system for any reflector, bremsstrahlung cameras, and active shock breakout measurement of hohlraum temperature. The data acquisition system is capable of recording up to 500 channels and the data from each shot is available on the Internet. A major new diagnostic presently under construction is the BEAMLET backlighter. We will briefly describe each of these diagnostics and present some of the highest-quality data from them. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1322618

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