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    Protein based nano-devices

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    FRONTIERS IN NANOSCIENCE AND NANOTECHNOLOGY Three volumes; editors A.Narlikar and Y.Li published by Oxford University Pres

    Scattering phenomena effects on growth of 308 nm laser irradiated bacteria in suspension

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    Study of scattering phenomena effects on growth of 308 nm laser irradiated bacteria in suspensio

    Spectroscopic investigation of inner filter effects by phthalocyanine solutions

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    In this study we report a systematic investigation of phthalocyanine (Pc) optical properties, showing that the effect of re-absorption of fluorescence plays a critical role in the line-shape of Pc optical spectra. We demonstrate that a strong dependence of the photoluminescence parameters on the concentration of phthalocyanines solution accounts for the apparent experimental evidence of a fluorescent dimer band in the emission at high concentrations. Despite a model based on fluorescent aggregates seems to describe the photophysical behavior of the system, additional experiments, such as electronic absorption spectroscopy, and fluorescence spectroscopy in which the optical pathlength inside the solution is suitably modified, provide a correct explanation of the observed optical behavior. We demonstrate that the shapes of optical spectra are completely independent on phthalocyanine aggregation state and are due only to experimental artifacts, i.e. inner filter effects. (C) 2004 Elsevier B.V. All rights reserved
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