Journal ArticleDOI
Absorption and Rotation of Light by Helical Polymers: The Effect of Chain Length
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In this article, the absorption of light and the rotation of polarized light near an absorption band are discussed for finite polymers, which are treated as a rigid array of identical groups, and the length dependence of the optical properties is calculated.Abstract:
The absorption of light and the rotation of polarized light near an absorption band is discussed for finite polymers. Only zero‐order wavefunctions and first‐order energies are considered for the polymer, which is treated as a rigid array of identical groups. The length dependence of the optical properties is calculated. The resulting equations are applied to the polypeptide α helix and 310 helix, polyadenylic acid, and dye complexes with these molecules.read more
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Book ChapterDOI
Calculation of protein conformation from circular dichroism.
TL;DR: This chapter discusses some recent developments in the estimation of various conformations in a protein molecule from its circular dichroism (CD) spectrum in the ultraviolet region.
Book ChapterDOI
Circular dichroism and optical rotatory dispersion of proteins and polypeptides.
TL;DR: This chapter discusses the methodology of circular dichroism (CD) and optical rotatory dispersion (ORD) data gathering and analysis in the rapidly changing field of protein structure, making use of synthetic polypeptide studies when necessary.
Journal ArticleDOI
Circular Dichroism of Biological Macromolecules
TL;DR: Circular dichroism should be useful to the theoretical scientist in identifying weakly allowed absorption bands as well as in providing rotational parameters which can be compared with the developing theory of optical activity.
Journal ArticleDOI
Direct Binding of Cholesterol to the Purified Membrane Region of SCAP: Mechanism for a Sterol-Sensing Domain
TL;DR: It is shown that the membrane domain of SCAP is a tetramer and that cholesterol binding is inhibited by cationic amphiphiles, raising the possibility of allosteric regulation by positively charged phospholipids.
Journal ArticleDOI
Optical Properties of Molecular Aggregates. I. Classical Model of Electronic Absorption and Refraction
TL;DR: In this article, a theoretical model was developed to predict the absorption and refraction of an aggregate of monomer units (a molecular aggregate, molecular crystal, or polymer) at any frequency.
References
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Journal ArticleDOI
Optical Rotatory Dispersion of Helical Polymers
TL;DR: In this paper, it was shown that for every transition in its individual residues, a helix has two transitions whose moments are respectively parallel and perpendicular to the screw axis, and that the largest contributions to the rotational strengths of these bands are equal and opposite in the two cases.
Journal ArticleDOI
The molecular configuration of deoxyribonucleic acid: II. Molecular models and their fourier transforms
Robert Langridge,D.A. Marvin,W. E. Seeds,H. R. Wilson,C. W. Hooper,M. H. F. Wilkins,L. D. Hamilton +6 more
TL;DR: In this article, the Fourier transform of the structure has been calculated, and comparison with the X-ray data described in Part I shows that the model needs modifying, and various models were built and adjusted until reasonable agreement was obtained between the Fouriers transform, averaged by rotation about the helix axis, and the observed 2D intensity data.
Journal ArticleDOI
The molecular structure of polyadenylic acid.
TL;DR: A model consisting of two parallel intertwined helical chains, each having a screw of 3·8 A and 45° and related to each other by a dyad axis parallel to the fiber axis is proposed.