ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The heats of mixing of polyriboadenylic acid (Poly A) and polyribouridylic acid (Poly U) in various proportions by changing the mole ratio n = [Poly U]/[Poly A] in 0,001, 0,1, and 0,5 molar NaCl solutions containing 0,1 molar tris-HCl buffer solution were measured. Constant values for the heats of mixing of the (Poly A+n Poly U) system are found for n ≤ 1 and n ≥ 2. From the results of UV and CD spectra, it may be considered that the mixing of Poly A and n (Poly U) leads to the formation of Poly(A+U) for n ≤ 1, and to that of Poly(A+2U) for n ≥ 2, even at [NaCl] = 0,001 mol/l.The enthalpies of formation of Poly(A+U) and that of Poly(A+2U) depend on the concentration of NaCl. This dependence may be attributed to the differences in conformation of Poly(A+U) in NaCl solution.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1977.021780725
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