𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effect of pressure on the helix and random coil forms of poly(D-glutamic acid)

✍ Scribed by Keizo Suzuki; Yoshihiro Taniguchi

Publisher
Wiley (John Wiley & Sons)
Year
1968
Tongue
English
Weight
362 KB
Volume
6
Category
Article
ISSN
0006-3525

No coin nor oath required. For personal study only.

✦ Synopsis

The absorption spectrum of the aqueous solution of acridine orange (A0)-poly-(D-glutamic acid) (PDGA) complex a t pH 4.5 (helix form) did not show any wavelength shift, but at pH 7.5 (coil form) changed to the absorption curve of the helix form by compression up to 4500 atm. The ionization degree of PDGA estimated from the electric conductivity of the aqueous solution of PDGA a t 4500 atm. was a value of about 5.3%. The entropy of the helix formation of PDGA from the titration data at 1 atm. and 30°C. was negative -2.98 e.u. I t will be concluded in this report that the volume change for coil to helix could be positive for PDGA and negative for AO-PDGA complexes.

📜 SIMILAR VOLUMES

Effect of a helix-coil transformation on
Effect of a helix-coil transformation on magnesium binding to α-poly-L-glutamic acid
✍ Ada L. Jacobson 📂 Article 📅 1963 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 453 KB 👁 1 views

## Abstract The effect of magnesium ion binding on the dissociation of side chain carboxyl group in α‐poly‐L‐glutamic acid has been measured by a modified titration technique involving pretitration of the polyacid with a strong base of a weakly bound counterion followed by addition of aliquots of t

Deuteration and solvent composition effe
Deuteration and solvent composition effects in the helix–coil transition of poly-γ-beiizyl-L-glutamate
✍ F. E. Karasz; J. M. O'Reilly 📂 Article 📅 1966 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 479 KB 👁 2 views

The effects of deuteration and of changes in solvent composition on the thermodynamics of the helix-coil transition have been studied by calorimetric and optical measurements in the poly-7-benzyl-Lglutamatedichloroacetic acid-l,%dichloroethane system. For a given solvent composition, deuteration of

Electric field effect on the helix–coil
Electric field effect on the helix–coil transition of poly(L-α,γ-diaminobutyric acid hydrochloride) in methanol/water mixtures
✍ Mitsuo Fujimori; Kazuo Kikuchi; Koshiro Yoshioka; Shigeo Kubota 📂 Article 📅 1979 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 444 KB

## Abstract Transient electric birefringence of poly(L‐α,γ‐diaminobutyric acid hydrochloride) in methanol/water mixtures has been measured over a wide range of field strengths and solvent compositions and at different polymer concentrations and temperatures. The molar ellipticity at 222 nm and the

Effect of non-complementary nucleotides
Effect of non-complementary nucleotides on the rate of helix formation: Kinetics of formation of poly (I)·poly (C,I) and poly (I)·poly (C,U) complexes
✍ Neville R. Kallenbach; Stanley D. Drost 📂 Article 📅 1972 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 386 KB 👁 2 views

## Abstract Apparent second‐order rate constants for complex formation between poly (I) and poly (C) and copolymers of C containing non‐complementary I or U residues have been determined spectrophotometrically. The rate constants decrease as the concentration of either I or U in the C strands incre