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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Optické senzory pro monitorování bioprocesů
 Podrazký, Ondřej ; Matějec, Vlastimil ; Kuncová, Gabriela ; Pospíšilová, Marie ; Mrázek, Jan ; Kašík, Ivan ; Rose, K. ; Jaffrezic-Renault, N. ; Dzyadevych, S. ; Šašek, L. ; Scully, P. J.
The contribution presents results of the research of an optical glucose sensor. The detection of oxygen depletion caused by glucose oxidation under glucoseoxidase catalysis was used in the glucose sensors. Fluorescence quenching of ruthenium complexes by oxygen was used for the oxygen detection. The complexes and enzyme were immobilized in inorganic-organic ORMOCER membranes. Developed fiber-optic sensors enable to detect glucose in concentrations up to 3 mmol/L and with response times of about 20s.
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Detection of aromatic hydrocarbons in air and water by using xerogel layers coated on PCS fibers excited by an inclined collimated beam
 Cherif, K. ; Hleli, S. ; Abdelghani, A. ; Jaffrezic-Renault, N. ; Matějec, Vlastimil ; Mrázek, Jan ; Chomát, Miroslav ; Kašík, Ivan
This paper deals with the detection of aromatic hydrocarbons in air or water which is based on refractive-index changes of a silica xerogel detection layer applied on silica optical fiber. The fiber is excited by an inclined collimated beam. The sensitivity of the tetraethoxysilane- and methyltriethoxysilane- based xerogel layers to benzene and toluene in air and in liquid water are presented. The detection limits were about 500 and 5 ppm for air and water, respectively.
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