PubMed Health⌕ Search

Biomedical subjects

E S Stevens

Publications and source records attributed to E S Stevens.

23 records · Page 2Linked to original sources
PubMed1983

Galactofuranosyl-containing glycopeptide of Penicillium charlesii. Vacuum ultraviolet circular dichroism.

The far and vacuum u.v. circular dichroism (CD) of peptidophosphogalactomannan from P. charlesii is reported to 182.5 nm in aqueous and aqueous/organic solvents, and to 150nm in films. CD of films of the peptide-free derivative is reported to 150 nm. On the basis of these data we conclude that the peptide chain is unordered, and may best be described as a hydrated coil showing some stiffness. The small observed saccharide CD may result from cancellation of contributions from the various saccharide structures present or from a lack of repeating secondary structure.

Circular Dichroism↗
PubMed1982

Circular dichroism conformational study of the chemotactic peptide formyl-L-methionyl-L-leucyl-L-phenylalanine.

The solution circular dichroism of the chemotactic agent formyl-L-methionyl-L-leucyl-L-phenylalanine was found to be highly solvent dependent. In relatively nonpolar solvents (fluoroalcohols) the circular dichroism is that characteristic of a folded conformation. In H2SO4 the tripeptide remains intact and displays a circular dichroism typical of highly solvated and totally disordered peptides. The order-to-disorder transition can be followed by addition of water to trifluoroethanol.

Chemotactic Factors↗
PubMed1981

Interaction of the three main components of clupeine with glycosaminoglycans.

The interactions between each of the three main components of clupeine (YI, YII and Z) and the glycosaminoglycans chondroitin sulfate, heparin and hyaluronic acid were studied with circular dichroism spectroscopy. The induced dichroism is a measure of relative complex stability, which increases with the number of sulfate groups on the glycosaminoglycan. Measuring the induced dichroism as a function of mole ratio of disaccharide to arginine establishes the stoichiometry of the complexes. For a given glycosaminoglycan, the induced dichroism depends on the clupeine, increasing the order YI less than YII less than Z.

Chondroitin Sulfates↗
PubMed1978

beta sheet formation by L-methionine oligopeptides.

Monodispersed N- and C-protected linear homo-oligomethionines (n = 2- -7) are studied by measurements of circular dichroism in the vacuum ultraviolet region. In the solid state higher members of the series take up a beta-conformation in which both parallel and antiparallel chain arrangements are present. The strong beta-forming tendency of the methionine residue is demonstrated.

Chemical Phenomena↗