𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Analysis of North American amber by carbon-13 NMR spectroscopy

✍ Scribed by Joseph B. Lambert; James S. Frye; George O. Poinar

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
429 KB
Volume
5
Category
Article
ISSN
0883-6353

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Amber from the Cretaceous and Tertiary periods in North America is characterized for the first time by nuclear magnetic resonance spectroscopy. Cretaceous samples from Cedar Lake in western Canada have nearly identical spectra to samples from New Jersey. There also are strong similarities between the spectra of these samples and those from Alaska and from the state of Washington. Tertiary samples from Arkansas, on the other hand, have quite distinct spectra. A common or similar paleobotanical origin is suggested for amber from diverse locations in North America, but amber also was produced from other, quite distinct trees as from Arkansas.

πŸ“œ SIMILAR VOLUMES

Quantitative analysis of a mixture of cr
Quantitative analysis of a mixture of cresols by carbon-13 NMR spectroscopy
✍ Hung-Cheh Chiang; Long-Jin Lin πŸ“‚ Article πŸ“… 1979 πŸ› John Wiley and Sons 🌐 English βš– 234 KB πŸ‘ 1 views

## Abstract The suitability of ^13^C NMR as a technique for determining __o__‐, __m__, and __p__‐cresols in their mixtures was investigated. Spectra were determined in methanol, containing __o__‐toluidine as an internal standard, without nuclear Overhauser suppression. Ratios of peak areas of each

Dynamics of lysine hydrochloride dihydra
Dynamics of lysine hydrochloride dihydrate measured by carbon-13 NMR spectroscopy
✍ Scott D. Swanson; Robert G. Bryant πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 333 KB

## Abstract The ^13^C NMR spectra for L‐lysine hydrochloride dihydrate are reported for static samples and samples spinning at the magic angle, which provide resolution of each carbon resonance. The spectra and the __T__~1s~, __T__~1p~ and __T__~1~ relaxation times for the carbon atoms demonstrate

Conformational analogies of morphine ago
Conformational analogies of morphine agonists and antagonists as revealed by carbon-13 NMR spectroscopy
✍ Ernest L. Eliel; Susan Morris-Natschke; Vera M. Kolb πŸ“‚ Article πŸ“… 1984 πŸ› John Wiley and Sons 🌐 English βš– 465 KB

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

Analysis of Carbon Metabolism in Escheri
Analysis of Carbon Metabolism in Escherichia coli Strains with an Inactive Phosphotransferase System by 13C Labeling and NMR Spectroscopy
✍ S. Flores; G. Gosset; N. Flores; A.A. de Graaf; F. Bolı́var πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 English βš– 255 KB

We have developed Escherichia coli strains that internalize glucose utilizing the GalP permease instead of the phosphoenolpyruvate:carbohydrate phosphotransferase system. It has been demonstrated that a strain with these modifications (PTS -Glc + ) can direct more carbon flux into the aromatic pathw

Purity analysis of hydrogen cyanide, cya
Purity analysis of hydrogen cyanide, cyanogen chloride and phosgene by quantitative 13C NMR spectroscopy
✍ Terry J. Henderson; David B. Cullinan πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 218 KB πŸ‘ 1 views

## Abstract Hydrogen cyanide, cyanogen chloride and phosgene are produced in tremendously large quantities today by the chemical industry. The compounds are also particularly attractive to foreign states and terrorists seeking an inexpensive mass‐destruction capability. Along with contemporary warf