Thermodynamics of transfer of three tetraalkylammonium bromides from water to aqueous urea solutions at 25.deg.

1972 ◽  
Vol 76 (9) ◽  
pp. 1369-1375 ◽  
Author(s):  
R. Bruce Cassel ◽  
Wen-Yang Wen
Keyword(s):  
Tetraalkylammonium Bromides ◽  
Thermodynamics Of Transfer ◽  
Aqueous Urea

Volumes and Heat Capacities of Transfer of Tetraalkylammonium Bromides from Water to Aqueous Urea Solutions at 25 °C

1973 ◽  
Vol 51 (2) ◽  
pp. 187-191 ◽  
Author(s):  
P. R. Philip ◽  
J. E. Desnoyers ◽  
A. Hade
Keyword(s):  
Transfer Functions ◽  
Pure Water ◽  
Heat Capacities ◽  
Tetraalkylammonium Bromides ◽  
Apparent Molal Volumes ◽  
Aqueous Urea ◽  
Molal Volumes

The apparent molal volumes and heat capacities of tetraalkylammonium bromides were measured in urea–water mixtures at 25 °C. The volumes and heat capacities of transfer from water to urea-water mixtures indicate that structural hydration effects are smaller in urea–water mixtures than in water. Also a comparison with the corresponding transfer functions from H2O to D2O suggests that urea–water mixtures are less structured than pure water.

Modeling of transfer properties using revised HKF theory: thermodynamics of transfer of an amino acid and small peptides from water to urea–water solutions at 298.15 K

1997 ◽  
Vol 75 (4) ◽  
pp. 456-464 ◽  
Author(s):  
Andrew W. Hakin ◽  
Lori L. Groft ◽  
Jocelyn L. Marty ◽  
Matthew L. Rushfeldt
Keyword(s):  
Heat Capacities ◽  
Semiempirical Calculation ◽  
Standard State ◽  
Small Peptides ◽  
Apparent Molar Heat Capacities ◽  
Thermodynamics Of Transfer ◽  
Aqueous Urea ◽  
Transfer Thermodynamics ◽  
Transfer Properties ◽  
Calculation Procedures

Relative densities, [Formula: see text] and heat capacity ratios, [Formula: see text] have been measured for aqueous solutions of glycine, glycylglycine, and glycylglycylglycine in aqueous urea solutions containing 1–13 mol kg−1 urea. These data have been used to calculate apparent molar volumes, [Formula: see text] and apparent molar heat capacities, [Formula: see text] which in turn have been used to obtain standard state volumes, [Formula: see text] and standard state heat capacities, [Formula: see text].Volumes and heat capacities of transfer from water to urea have been calculated from our reported standard state data. Heat capacities of transfer of the investigated systems have been modeled using a procedure developed from the semiempirical calculation procedures proposed by Helgeson, Kirkham, and Flowers. Keywords: amino acids, peptides, calorimetry, transfer thermodynamics, HKF theory.

Virucidal (Rabies and Poliomyelitis) Activity of Aqueous Urea Solutions

1936 ◽  
Vol 35 (1) ◽  
pp. 74-76 ◽  
Author(s):  
E. M. Mackay ◽  
C. R. Schroeder
Keyword(s):  
Aqueous Urea
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