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Preparation and characterisation of chalcogenide glasses
Ležal, Dimitrij ; Zavadil, Jiří ; Poulain, M.
Chalcogenide glasses systems AS-S, As-Se, As-S-Se and Ge-Se-Te have been prepared and characterised by absorption spectroscopy, scanning electron microscopy and photoluminescence. Photoluminescence spectra have been measured in wide temperature range and the role of multiphonon transitions in mediating the inner 4f-4f electronic transitions was demonstrated. Peculiar Pr related band at 1600 nm has been found in some samples.
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Seeing is believing
Govindjee, J. ; Nedbal, Ladislav
The authors present a short review of chlorophyll fluorescence imaging technique as used in plant science. The review is introducing a special issue of Photosynthetica journal dedicated to various applications of the method.
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Determination of Biomass Concentration on Inorganic Carrier
Jurčová, Irena ; Kuncová, Gabriela ; Burkhard, J.
The aim of this work have been to develop method of determination of biomass concentration of cells immobilized on inorganic carrier, based on measuring of 3D-fluorescence spectra. A model bacteria strain was Pseudomonas sp. 2, isolated from soil contaminated by PCBs. The method was calibrated by weighing of dry mass. We have identified wavelengths of excitation and emission light at which the intensities of fluorescence were proportional to the concentration of biomass within the growth curves of cells planted on biphenyl or biphenyl with Delor 103 as sole carbon sources.
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