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61.
Bhowmik Siddhartha Holm Arliena Ostroverkhova Oksana Atre Sundar 《Applied Physics A: Materials Science & Processing》2011,103(4):1117-1123
Metal nanostructures are of considerable interest in the field of plasmonics and metamaterials and could have a wider impact
if they are successfully embedded in a stable, inert and flexible polymer matrix. Fabrication of such structures is challenging
for a variety of reasons including thermal stability, material compatibility with processing steps and general handling of
material. In this work we have demonstrated the fabrication of metal nanostructures and embedded them in a polymer. Furthermore,
these structures were fabricated on a flexible polymer membrane and detached from a carrier substrate. Characterization of
these structures was performed with SEM, TEM and EDS. 相似文献
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Cellobiose dehydrogenase activity (0.25–1 U Ml?1) is monitored by oxidation of cellobiose to cellobionolactone, thus reducing 2,6-dichlorophenolindophenol to a colourless compound. To prevent any β-glucosidase from reacting, gluconolactone is added as inhibitor. The sample throughput is 120 h?1. 相似文献
64.
Targeted analysis of protein citrullination using chemical modification and tandem mass spectrometry
Maria Stensland Anders Holm Andrea Kiehne Burkhard Fleckenstein 《Rapid communications in mass spectrometry : RCM》2009,23(17):2754-2762
Protein citrullination originates from enzymatic deimination of polypeptide‐bound arginine and is involved in various biological processes during health and disease. However, tools required for a detailed and targeted proteomic analysis of citrullinated proteins in situ, including their citrullination sites, are limited. A widely used technique for detection of citrullinated proteins relies on antibody staining after specific derivatization of citrulline residues by 2,3‐butanedione and antipyrine. We have recently reported on the details of this reaction. Here, we show that this chemical modification can be utilized to specifically detect and identify citrullinated peptides and their citrullination sites by liquid chromatography/tandem mass spectrometry (LC/MS/MS) analysis. Using model compounds, we demonstrate that in collision‐induced dissociation (CID) a specific, modification‐derived fragment ion appears as the dominating signal at m/z 201.1 in the MS/MS spectra. When applying electron transfer dissociation (ETD), however, the chemical modification of citrulline remained intact and extensive sequence coverage allowed identification of peptides and their citrullination sites. Therefore, LC/MS/MS analysis with alternating CID and ETD has been performed, using CID for specific, signature ion‐based detection of derivatized citrullinated peptides and ETD for sequence determination. The usefulness of this targeted analysis was demonstrated by identifying citrullination sites in myelin basic protein deiminated in vitro. Combining antibody‐based enrichment of chemically modified citrulline‐containing peptides with specific mass spectrometric detection will increase the potential of such a targeted analysis of protein citrullination in the future. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Asgedom EG Gelius LJ Austeng A Holm S Tygel M 《The Journal of the Acoustical Society of America》2011,130(4):2024-2034
The problem of locating point-like targets beyond the classical resolution limit is revisited. Although time-reversal MUltiple SIgnal Classification (MUSIC) is known for its super-resolution ability in localization of point scatterers, in the presence of noise this super-resolution property will easily break down. In this paper a phase-coherent version of time-reversal MUSIC is proposed, which can overcome this fundamental limit. The algorithm has been tested employing synthetic multiple scattering data based on the Foldy-Lax model, as well as experimental ultrasound data acquired in a water tank. Using a limited frequency band, it was demonstrated that the phase-coherent MUSIC algorithm has the potential of giving significantly better resolved scatterer locations than standard time-reversal MUSIC. 相似文献
68.
Fractional derivatives are well suited to describe wave propagation in complex media. When introduced in classical wave equations, they allow a modeling of attenuation and dispersion that better describes sound propagation in biological tissues. Traditional constitutive equations from solid mechanics and heat conduction are modified using fractional derivatives. They are used to derive a nonlinear wave equation which describes attenuation and dispersion laws that match observations. This wave equation is a generalization of the Westervelt equation, and also leads to a fractional version of the Khokhlov-Zabolotskaya-Kuznetsov and Burgers' equations. 相似文献
69.
Elena Pyanzina Sofia Kantorovich Juan J. CerdàChristian Holm 《Journal of magnetism and magnetic materials》2011,323(10):1263-1268
In this paper we present theoretical and simulation results on the structure factor of mono- and bidisperse ferrofluids with chain aggregates, both with and without an applied external magnetic field. Chain distribution is obtained by the density functional theory (DFT). The radial distribution function (RDF) is calculated directly on the basis of the chain distribution and Fourier transformed to calculate the structure factor. An extensive comparison of the theoretical predictions to the results of the molecular dynamics computer simulations is provided. The proposed combined approach allows to elucidate the connection between experimentally observed small angle neutron scattering (SANS) images and the ferrofluid microstructure. 相似文献
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