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- W788638614 abstract "The relative viscosities and osmotic coefficients of solutions of urea, 1,3-dimethyl-urea(DMU), acetamide(AA), and propionamide (PA) in dimethylsulfoxide(DMSO), water, methanol, and in ethanol have been measured at 25 and C by viscometry and osmometry. Viscosity increment in nonaqueous solutions decreased with increasing of the partial molal volumes of the solutes, but in aqueous solution the result was inversed. Viscosity increment of aqueous solution was smaller than that of aqueous DMU solution, but that of nonaqueous urea solution was larger than that of DMU. Amides, however, showed similar viscosity increment in any solvent.Osmotic coefficients of aqueous solution of urea were larger than those of DMU. In the nonaqueous solutions urea exhibited larger deviation from Raoult's law than DMU. The results indicated that urea molecules break water-structure in water, self-associate in DMSO, and showed larger solute-solvent interaction in alcohols than DMU. It can be also confirmed that amides break alcohol structure to a greater extent than any other solutes. carcinogenicity by means of simple Huckel method.The compounds which are 0.5 or more in the value of the sum of frontier electron density for nucleophilic reaction of the two atoms of K-region and that of the atom of L-region in the proximity of K-region were found to be agreed well with experimental results for carc？ogenic activity. It is therefore suggested that both the K-region and the L-region play an important role in the formation of the molecular complex which was shown to be obtained in the combination of chemical carcinogen with cellular component in the first step of carcinogenesis.',PY = '1980-00-00',RF = '" @default.
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- W788638614 date "1980-01-01" @default.
- W788638614 modified "2023-09-24" @default.
- W788638614 title "The Behavior of Solutes in Nonaqueous Solutions (II). Relative Viscosities and Osmotic Coefficients of Urea, 1,3-Dimethylurea, Acetamide, and Propionamide" @default.
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