Materials Literature
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Abstract The surface‐enhanced Raman (SER) spectra of aromatic amino acids ( L ‐phenylalanine, L ‐tyrosine and tryptophan) and their glycyl dipeptides (glycyl‐ L ‐phenylalanine, glycyl‐ L ‐tyrosine and glycyl‐ L ‐tryptophan) adsorbed on Ag colloidal particles have been obtained. The surface‐enhanced and ordinary Raman…
The crystal structure of human ubiquitin has been solved by x-ray diffraction methods and refined by standard procedures to a conventional crystallographic R factor of 0.176 at 1.8-A resolution (Vijay-Kumar, S., Bugg, C.E., and Cook, W.J. (1987) J. Mol. Biol. 194, 525-538). Crystals of yeast and oat ubiquitin have bee…
The charge-dependent ‘‘effective’’ electronegativity χα of an atom α in a molecule or crystal, i.e., χα=(χ0α+Δχα)+2(η0α +Δηα)qα +∑β≠α qβ/Rαβ differs from the expression for the isolated atom (χ0α+2η0αqα) because of corrections to the electronegativity (Δχα) and hardness (Δηα), respectively, and due to the external pot…
More than two decades ago, Bonner reported the first preparation of poly (aromatic ketones) (PAK) by aluminum chloride-catalyzed acylation of diphenyl ether with aromatic diacid chlorides [1]. These were low molecular weight materials because of solubility limitations. In the intervening years, significant progress ha…
Gram-negative, aerobic bacteria capable of facultative growth using ferric ions or thiosulfate or sulfite as electron acceptors were readily isolated from oil field fluids. Morphological and biochemical data are presented which support the classification of these isolates as being strains of Alteromonas putrefaciens (…
One of the major causes of magnesium corrosion is the presence of iron as an impurity in commercial alloys. Alloying the material with manganese may reduce the corrosion rate to acceptable levels. The corrosion rate of a Mg-9% Al-1% Zn alloy, containing varying amounts of Mn and Fe, correlates with the Fe:Mn ratio in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly stabilized copper(III) complexesFred C. Anson, Terrence J. Collins, Thomas G. Richmond, Bernard D. Santarsiero, James E. Toth, and Brian G. R. T. TrecoCite this: J. Am. Chem. Soc. 1987, 109, 10, 2974–2979Publication Date (Print):May 1, 1987Publication History Publishe…
We discuss, using a Landaude Gennes formalism, the nematic-isotropic transition temperature for a system placed between two parallel plates, subject to identical homeotropic or homogeneous boundary conditions at each plate. The temperature at the phase transition may increase or decrease as the inverse sample thicknes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of copolyesters in Alcaligenes eutrophus H16 from carbon-13 labeled acetate and propionateYoshiharu Doi, Masao Kunioka, Yoshiyuki Nakamura, and Kazuo SogaCite this: Macromolecules 1987, 20, 12, 2988–2991Publication Date (Print):May 1, 1987Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of olefins and alcohols by peroxo-molybdenum complex derived from tris(cetylpyridinium) 12-molybdophosphate and hydrogen peroxideYasutaka Ishii, Kazumasa Yamawaki, Tsutomu Yoshida, Toshikazu Ura, and Masaya OgawaCite this: J. Org. Chem. 1987, 52, 9, 1868–1870Public…
Abstract Over 100 times amplified image recording was achieved by means of reading out nematic isotropic phase transition of liquid crystal induced by partial trans→cis photoisomerization of a small amount(up to 5 mol%) of 4-butyl-4′-methoxyazobenzene mixed with 4-cyano-4′-n-pentylbiphenyl.
A powerful new technique is reported which enables realistic calculation of the optical energy gap of absorbing thin solid films by an analysis of measured transmittance and reflectance spectra in the fundamental absorption region. At the same time a new analytical method allows the thickness of films to be evaluated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarons and bipolarons on a conducting polymer in solutionM. Nowak, S. D. D. V. Rughooputh, S. Hotta, and A. J. HeegerCite this: Macromolecules 1987, 20, 5, 965–968Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase transitions in crosslinked gels of natural polymersTakayuki Amiya and Toyoichi TanakaCite this: Macromolecules 1987, 20, 5, 1162–1164Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular excimer formation in bichromophoric molecules linked by a short flexible chainFrans C. De Schryver, Pol Collart, Jan Vandendriessche, Rudy Goedeweeck, Anne Mie Swinnen, and Marc Van der AuweraerCite this: Acc. Chem. Res. 1987, 20, 5, 159–166Publication Date (P…
In this investigation we have studied how the presence of a liquid phase affects the grain morphology and grain growth kinetics in Al 2 O 3 at 1800°C using the growth of both matrix grains and large spherical single‐crystal seeds growing into the matrix. The growth rates of the matrix grains were found to decrease in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterobimetallic compounds linked by heterodifunctional ligandsR. Morris Bullock and Charles P. CaseyCite this: Acc. Chem. Res. 1987, 20, 5, 167–173Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.acs.…
Abstract Previous papers have shown that antiplasticization of polysulfone and poly(phenylene oxide) by low molecular weight diluents is accompanied by substantial reductions in permeability to gases like helium, carbon dioxide, and methane because of reduced mobility in the glass. These effects are not explained even…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTImmortal polymerization of .epsilon.-caprolactone initiated by aluminum porphyrin in the presence of alcoholMasato Endo, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1987, 20, 12, 2982–2988Publication Date (Print):May 1, 1987Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarburst dendrimers. 4. Covalently fixed unimolecular assemblages reiminiscent of spheroidal micellesDonald A. Tomalia, V. Berry, M. Hall, and D. M. HedstrandCite this: Macromolecules 1987, 20, 5, 1164–1167Publication Date (Print):May 1, 1987Publication History Published on…