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search.filters.applied.f.access: openAccess × End date: 2014 × Start date: 2014 × DDC: 540 × Publisher: Cambridge : RSC Publ. ×

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    Towards on-site testing of Phytophthora species
    (Cambridge : RSC Publ., 2014) Schwenkbier, Lydia; Pollok, Sibyll; König, Stephan; Urban, Matthias; Werres, Sabine; Cialla-May, Dana; Weber, Karina; Popp, Jürgen
    Rapid detection and accurate identification of plant pathogens in the field is an ongoing challenge. In this study, we report for the first time on the development of a helicase-dependent isothermal amplification (HDA) in combination with on-chip hybridization for the detection of selected Phytophthora species. The HDA approach allows efficient amplification of the yeast GTP-binding protein (Ypt1) target gene region at one constant temperature in a miniaturized heating device. The assay's specificity was determined by on-chip DNA hybridization and subsequent silver nanoparticle deposition. The silver deposits serve as stable endpoint signals that enable the visual as well as the electrical readout. Our promising results point to the direction of a near future on-site application of the combined techniques for a reliable detection of Phytophthora species.
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    Differences in single and aggregated nanoparticle plasmon spectroscopy
    (Cambridge : RSC Publ., 2014) Singh, Pushkar; Deckert-Gaudig, Tanja; Schneidewind, Henrik; Kirsch, Konstantin; van Schrojenstein Lantman, Evelien M.; Weckhuysen, Bert M.; Deckert, Volker
    Vibrational spectroscopy usually provides structural information averaged over many molecules. We report a larger peak position variation and reproducibly smaller FWHM of TERS spectra compared to SERS spectra indicating that the number of molecules excited in a TERS experiment is extremely low. Thus, orientational averaging effects are suppressed and micro ensembles are investigated. This is shown for a thiophenol molecule adsorbed on Au nanoplates and nanoparticles.