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We report a simple method for measuring partial specific volumes, of polymers in dilute solutions with an accuracy of 3 parts per thousand. This method has been applied to 7 polypeptides in 4 organic solvents. The residue volumes deduced from these data are compared to those calculated by a...
The γ‐ethyl‐L‐glutamate NCA polymerization initiated by di‐n‐butyl and di‐isopropyl amine was studied. The experimental kinetic curves show an autocatalytic portion with 25–30% conversion, followed by a pseudo first‐order region which extends up to at least 85–90%. In this...
The statistical mechanical theory of the helix‐coil transition of DNA has been recently discussed by one of the authors, who considered an assembly of DNA molecules with a Markoff distribution of nucleotide sequences. The present communication improves upon the above mentioned theory by...
The kinetics of the depolymerization of native dextran in dilute hydrochloric acid at different temperatures has been followed by measurements of &Mmacr;w, &Mmacr;n, (η), 〈ρ2〉1/2, and S. The data allow the correlation of the various parameters of the total hydrolyzate at various degrees of...
A calculation based upon Gorin's equation for the electrophoresis of a rigid cylinder is used to compare the available results of electrophoresis and membrane equilibrium experiments on DNA. The distribution of chloride ions across a membrane impermeable to DXA is considered. For a reasonable...
The dielectric constant and the electric birefringence of poly‐γ‐benzyl‐L‐glutamate in ethylene dichloride–dichloroacetic acid mixtures have been measured as functions of the solvent composition. These properties undergo a marked decrease with the addition of a small amount of...
Light‐scattering, sedimentation, viscosity, and reducing power measurements have been carried out on a sample of native dextran from Leuconostoc mesenteriodes B‐512. The results are discussed in relation to the structure, polydispersity, and branching of the polysaccharide. The effect of...
The effect of small quantities of metal ions on the electrophoretic mobility of calf thymus DNA in solutions maintained at 0.2 ionic strength with weakly interacting (CH3)4N+ ions yields information about interactions occurring in a region very close to the polymer chain. By means of this...
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