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The enthalpy change accompanying the double helix–coil transition of polyriboadenylic acid (poly A) in aqueous solution has been measured optically and calorimetrically in the pH range 5.7–4.5. The course of this cooperative transition was followed optically by measuring changes in...
A method is described for determining the fractions of adenine‐uracil and guanine‐cytosine base pairs of partly double‐helical ribonucleic acids in aqueous solution. The method is based upon the ability to distinguish between paired and unpaired bases by means of infrared spectroscopy of...
The structure of β‐chitin has been reexamined in an X‐ray diffraction study of the highly crystalline material available from pogonophore tubes. Oriented specimens were prepared by suspending the dispersed deproteinized tube in a fibrin clot which was then stretched into an oriented fiber....
An expansion valid for short times is presented for the rectangular approximation to the Lamm equation when the sedimentation coefficient can be expressed as s = S0(1−kc). The expansion allows the study of meniscus perturbations on the Faxén approximation, as well as a determination of when...
In this paper two points are considered: the methods of evaluating the helical content &thetas; and the calculation of the parameters of the transition from experimental data and its interpretation. The parameter ΔH obtained is in good agreement with the calorimetric one and v is found to be...
A new apparatus for the study of flow dichroism of macromolecules is described. The flow is down a long, narrow channel and an unpolarized light beam propagates along the flow direction. For a molecule such as DNA, in which the transition moments of the chromophores are perpendicular to the axis...
The isomerization of poly‐L‐proline in different solvents has been studied by NMR spectroscopy. Different resonance signals for the CHα protons have been obtained for the two different helical conformations of thus compound, namely form I and form II.
A statistical analysis of the relation between the amino acid composition of proteins and the amount of helical secondary structure as characterized by the Moffitt b0 parameter has shown a high degree of correlation of the b0 parameter with those amino acids whose homopolymers can form helical...
The Hydrogen–tritium exchange character of poly‐D,L‐alanine was studied in detail as a model for the hydrogen exchange behavior of the unhindered, polymeric peptide group. The random chain nature of poly‐D,L‐alanine was evident in the uniformity of exchange rate of all its hydrogens and...
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