Conformational transitions in several individual tRNAs (tRNAMetf, tRNAPhe from E. coli, tRNAVal1, tRNASer, tRNAPhe from yeast) have been studied under various environmental conditions. The binding isotherms studies for dyes-tRNA complexes exhibited similarities in conformational states of all tRNAs
Conformational behavior of polyethylenimine derivatives revealed by fluorescence spectroscopy
β Scribed by Robert A. Pranis; Irving M. Klotz
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1977
- Tongue
- English
- Weight
- 790 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0006-3525
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β¦ Synopsis
Abstract
Conformation behavior of polyethylenimine has been examined by studies of the fluorescence characteristics of derivatives of the polymer containing pyrenyl ligands. Excimer formation within the macromolecular matrix serves as a sensitive probe of group proximities. The experimental observations combined with nearest neighbor analyses lead to quantitative assessments of the extent of interaction between polymer side chains.
π SIMILAR VOLUMES
## Abstract The ^13^C chemical shift of the substituted or functionalized carbon of various medium and large rings is plotted against ring size (6β15 carbons). The curves thus obtained allow a conformational analysis of the corresponding derivatives.
The extreme similarity (except in the vicinity of the nitrogen atom) of the 13C spectra of the agonist-antagonist pairs oxymorphone-naloxone and morphine-nalorphine and their respective hydrochlorides suggests that the N-methyl and N-aUyl compounds have analogous conformations. This makes unlikely a