Flora Europaea, Vol. 2: Rosaceae to Umbelliferae by T. G. Tutin, V. H. Heywood, N. A. Burges, D. M. Moore, D. H.

By T. G. Tutin, V. H. Heywood, N. A. Burges, D. M. Moore, D. H. Valentine, S. M. Walters, D. A. Webb, P. W. Ball, A. O. Chater, I. K. Ferguson

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The hydrolysis of cytidine 2', 3'-cyclic phosphate has been studied widely, since this compound is a very convenient substrate for pancreatic ribonuclease. It would be desirable to know AG° for this hydrolysis. It is a relatively straightforward matter to * Selected Values of Chemical Thermodynamic Properties, Nat. Bur. Standards ( U . S . ) , Circ. 500, 1952; Technical N o t e 270-3, 1968; 270-4, 1969; 270-5, 1971; 270-6, 1971; 270-7, 1973; 270-8, 1981; J. O. Hutchens in "Handbook of Biochemistry," ( H .

At 1 atm and 25°C is 3. The equilibrium constants for the oxygenation reaction 0 2( g ) + H r ( a q ) ^ H r 0 2( a q ) , (4) where Hr represents hemerythrin (the oxygen-carrying pigment of Phascolopsis gouldii) are: 1 f(°C) /C(atm- ) 0 25 9120 380 (a) Using the thermodynamic relation d In Κ/dT = LH°/RT ΔΗ°, the heat of oxygenation. 5 kcal/mole. (b) Find A5°, the entropy change for reaction (4) at 25°C. 1 cal/mole deg. (c) Find AG° for the reaction: 0 2 (aq) + Hr (aq) = H r 0 2 (aq) 2 find (5) Answer: -7590 cal/mole.

Thus, one method of evaluating the stability of this bond is to determine the free energy of transfer AGt° of an apolar group from an organic environment to water. A number of such calculations have been made and lead to positive values of AGt° for apolar groups. Since hydrophobic bonds are of special interest in protein molecules, it would be particularly desirable to evaluate AGt° for apolar amino-acid side chains. However, these side chains cannot be plucked off by themselves. 34) that is, the free energy of transfer of the amino acid R - C H ( N H ^ ) C O O ~ is composed of two parts, that of the apolar R group, and that of the zwitterion base which may be approximated by glycine, H-CH(NHÎ)COO".

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