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A general method to calculate experimentally accessible thermodynamic and kinetic quantities for any type of cooperative transitions is developed. Special attention has been directed to transition curves and mean relaxation times. The procedure is applied to the most general case of...
Electronic excitation spectra were measured on a donor‐acceptor pair which was separated by oligomers of L‐proline of gradually increasing lengths. The logarithmic plot of the transfer efficiency versus the donor‐acceptor separation, for (pro)n oligomers with n⩾5, yielded a slope of 5.8...
The dynamic viscoelastic properties of hyaluronic acid solutions have been measured over the frequency range 0.02–1.67 cps. The effects of varying temperature, hyaluronic acid concentration, pH, and ionic strength on the dynamic shear moduli were studied. The solutions exhibited a sharp...
The denaturation of single‐stranded and double‐stranded RNA's in solutions with varying proportions of dimethyl sulfoxide has been followed by changes in absorbancy, optical rotation, and—with a double‐stranded form of bacteriophage of MS2 RNA— infectivity for bacterial spheroplasts. By...
To make a comparison of some of the various polymerization methods, poly‐γ‐D‐and L‐glutamylglycine were synthesized through the mixed anhydride, carbodiimide, and pentachlorophenyl active ester methods. This last method proved to be best, on the basis of weight‐average molecular...
Random number methods are used to calculate helix—coil transition curves for the model of a heterogeneous polypeptide of random sequence. These curves are compared with several other calculations. The random number computations confirm the exact calculation of Lehman; among the several...
The helix‐coil transition has been studied by high‐resolution NMR for three water‐soluble polypeptides. Such systems are better models for protein behavior than those in TFA‐CDCl3 solvent. An upfield shift of ∼7 cps is observed for the α‐CH peak of poly(L‐glutamic acid) and...
An alcoholysis method is described for the modification of high molecular weight poly(β‐benzyl L‐asparatate); by this method the benzyl groups in the polypeptide have been replaced by methyl, ethyl, isopropyl, n‐propyl, and phenethyl groups to give a series of copolymers of each of the...
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