The X-ray photoelectron spectra of all-trans-retinal and 11-cis-retinal have been observed by irradiating monochromatized AlKα-X-rays. Some difference was observed in the peaks around 10–20 eV in the spectra of the two retinals, and the CNDO-MO calculations on the two molecules qualitatively indicate that the difference may correspond to the difference in the locations of the energy levels of the two retinals.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerroelectric properties of a copolymer of vinylidene fluoride and trifluoroethylene blended with poly(methyl methacrylate)K. Saito, S. Miyata, T. T. Wang, Y. S. Jo, and R. ChujoCite this: Macromolecules 1986, 19, 9, 2450–2452Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://doi.org/10.1021/ma00163a021Request reuse permissionsArticle Views134Altmetric-Citations12LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (353 KB) Get e-Alertsclose Get e-Alerts
Abstract Solid-state 13C NMR characterization of cross-linkage formation between the exocyclic methylene groups of labdane polymers in amber demonstrated that the process is an apparent first-order reaction with a half-life of ≈13 million years.
Abstract The molecular dynamics of the inclusion complexes of cyclohexaamylose as a model of enzyme have been studied by means of carbon-13 NMR spectroscopy. As substrates we have chosen l-phenylalanine, l-tyrosine, l-tryptophan, glycyl-l-phenylalanine, and l-phenylalanyl-l-lysine. The molecular motion of both the cyclohexaamylose and the substrates in D2O–DCl solutions have been investigated by dividing the spin-lattice relaxation time into two contributions, the overall molecular reorientation and the anisotropic internal rotation. Upon complex formation, the correlation times for the internal motion of the phenyl ring of phenylalanine residue increase by a factor of up to 8, while those for the overall reorientation increase by a factor of only 2. These results indicate that the complex formation of the substrate with the cyclohexaamylose are induced by the insertion of aromatic side chain into a cavity of cyclohexaamylose even in the aqueous solution. The overall correlation times of the substrates are about three to seven times snorter than those of the host molecule. Thus the forces which bind the host cyclohexaamylose and the substrate are relatively weak. It was observed that the tightness of the inclusion varies with the types of aromatic amino acids and dipeptides.
