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Defluoridation of groundwater using vermiculite modified with hexadecyltrimethylammonium: a case study of Siloam Village, Limpopo Province, South AfricaOlogundudu, Tayo Oladipo 05 1900 (has links)
MENVSC / Department of Hydrology and Water Resources / See the attached abstract below
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Charakterizace hyaluronanu a jeho interakcí s tenzidy ultrazvukovou spektroskopií a densitometrií / Ultrasonic and Densitometric Characterization of Hyaluronan and its Interaction with SurfactantHurčíková, Andrea January 2014 (has links)
This disertation thesis is focused on the study of physico-chemical interactions of hyaluronan (with molecular weights from 10 to 1750 kDa) with cationic surfactants measured using uncommon technique named high resolution ultrasonic spectroscopy. Densitometer was also used for the study of these interactions, in measuring of density and ultrasonic velocity of hyaluronan with different molecular weight in dependence on elevated temperature (25 50 °C). The aim is the determination of critical micelle concentration (CMC) and critical aggregation concentration (CAC) of the suractants in the absence and in the presence of hyaluronan with various molecular weights. Interactions in this system are important for the design of the systems for the targeted delivery, especially for the drugs. The experiments were made in water and sodium chloride solution. The significant breakpoint in the ultrasonic velocity showed changes in the system hyaluronan-surfactant.
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