منابع مشابه
Activity in Eutrophic Water
The aand l-glucosidase activity in natural samples can be readily measured during short incubation times (20 min) by using the artificial substrates 4-methylumbelliferyl-a-D-glucoside and 4-methylumbelliferyli--Dglucoside. The apparent Km of both aand ,I-glucosidase for these respective substrates is 0.01 ,uM. The homologous disaccharides maltose and cellobiose competitively inhibit aand I-gluc...
متن کاملMeasuring water potential (activity) from free water to oven dryness.
Water activities (potentials) in plant materials were measured over the range from free water to oven dryness with a Spanner thermocouple psychrometer. In a two-step procedure, water was first condensed on the thermocouple junction for several minutes. The sample was then inserted under the wet thermocouple and the maximum psychrometric cooling was measured in about 10 seconds. Calibration was ...
متن کاملWater activity in polyol/water systems: new UNIFAC parameterization
Water activities of a series of polyol/water systems were measured with an AquaLab dew point water activity meter at 298 K. The investigated polyols with carbon numbers from n=2–7 are all in liquid state at room temperature and miscible at any molar ratio with water. In aqueous solutions with the same molar concentration, the diols with lower molecular weight lead to lower water activities than...
متن کاملThermodynamic Study of Water Activity of Single Strong Electrolytes
Today, due to the natural decline of oil exploitation, the use of methods of oil recovery, has made significant progress. However, these methods are accompanied by accumulation and deposition of mineral deposits in oil field installations. In the present study, aqueous solutions, strontium sulfate, barium sulfate, manganese sulfate and nickel sulfate are studied, in terms of EUNIQUAC model and ...
متن کاملLaccase Activity in CTAB-Based Water-in-Oil Microemulsions
The aim of this study was to develop a microemulsion system as a medium for laccase-catalyzed reactions. Phase behavior studies were conducted by constructing partial pseudo-ternary phase diagrams for systems comprising of cetyltrimethylammonium bromide (CTAB), various organic solvents as the oil phase (i.e., hexane, cyclohexane, heptane, octane, isooctane, toluene, isopropyl myristate), two co...
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ژورنال
عنوان ژورنال: Spectroscopy: An International Journal
سال: 2012
ISSN: 0712-4813,1875-922X
DOI: 10.1155/2012/414635