The effect of the binding of the alkaline earth cations and of cupric and lanthanum ions on the dissociation of the sidechain carboxyl groups in a-poly-kglutamic acid has been measured by a modified titration technique. The a-poly-bglutamic acid was pretitrated with the strong base of a weakly bound
Specific ion effects on the solution conformation of poly-L-proline
โ Scribed by Thomas Schleich; Peter H. Von Hippel
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1969
- Tongue
- English
- Weight
- 925 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0006-3525
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The infrared absorption of poly-L-proline in concentrated aqueous salt solutions was measured in the fundanierital region. Of primary interest were the carbonyl absorption of the peptide linkage and the methylene C-H bending absorption of the pyrrolidine ring. These spectral regions each show an add
The optical rotatory dispersion in the range 630-340 mp has been measured for aqueous solutions of the tetramethylammonium salt of a-poly-L-glutamic acid to compare the effects produced by added tetramethylammonium chloride and magnesium chloride at equivalent ionic strengths. The addition of magnes
## SYNOPSIS Absorption and CD spectra of the P-P\* transition near 200 nm are calculated for helical (Pro),,, forms I and I1 with a variable proline ring conformation characterized by torsion angle X in the range -60' to 60". The spectra for poly ( P r o ) I are not sufficiently sensitive to X \*
High-resolution nuclear magnetic resonance spectra at 100 MHz have been obtained on poly-iV-methyl-L-alanine in the chloroform-trifluoroacetic acid system under various conditions of solvent composition. Different spectra are observed for the CH,-C,, C,-H, and N-CHI protons. On the basis of conforma