Molecular weights (molar masses), molecular weight distributions, dissociation constants and other interaction parameters are fundamental characteristics of proteins, nucleic acids, polysaccharides and glycoconjugates in solution. Sedimentation equilibrium analytical ultracentrifugation provides a powerful method with no supplementary immobilization, columns or membranes required. It is a parti...

Measurements of heat capacity were made on rubber hydrocarbon in its different forms from 14 to 320° K with an adiabatic vacuum-type calorimeter. At 14° K the heat capacity was found to be 0.064 j/g/"C for both the metastable amorphous and the crystalline forms. With increase in temperature, the heat capacity increases gradually up to a transition at about 199° K, the amorphous form having a li...