Materials Literature
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The structure of the type III variant of chloramphenicol acetyltransferase reveals that Thr-174, a conserved residue, is hydrogen-bonded to a bound water molecule (water 252). Modeling studies (P. C. E. Moody and A. G. W. Leslie, unpublished data) suggested that water 252 could play a part in transition state stabiliz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt complexes of octaethyloxophlorin. Metal-centered redox chemistry in the presence of a redox-active ligandAlan L. Balch, Marinella Mazzanti, and Marilyn M. OlmsteadCite this: Inorg. Chem. 1993, 32, 22, 4737–4744Publication Date (Print):October 1, 1993Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of nematic-smectic phase transition in a semiflexible main-chain liquid crystalline polymerS. D. Hudson, A. J. Lovinger, R. G. Larson, D. D. Davis, R. O. Garay, and K. FujishiroCite this: Macromolecules 1993, 26, 21, 5643–5650Publication Date (Print):October 1, 199…
We have studied the ferrielectric SmCγ* phase by means of laser beam diffraction and photon correlation spectroscopy. We found that the disordered structure and low frequency fluctuation characteristically distinguish SmCγ* from SmC and SmCA. These phenomena are qualitatively explained by the existing model structure,…
In order to understand the molecular mechanics involved in the adhesion of a bimaterial interface bond, a Raman microprobe shear apparatus has been designed and fabricated. The apparatus is fabricated to perform a pure shear experiment on a bimaterial interface produced by the vapor deposition of a thin film of ice on…
Different cold plasmas have been used to treat the surface of polyethylene terephtalate (PET) in order to improve the adhesion of alumina thin films deposited by RF sputtering. The influence of these treatments on the surface free energy of the polymer is shown by a study of wettability. ESCA analysis of the PET surfa…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Ladungstrennung durch Lichtanregung , Schneller Intrarotaxan‐Elektronentransfer über eine kurze Distanz, Verschiebung der beiden Rotaxanteile gegeneinander und langsamer Intrarotaxan‐Elektronentransfer über eine längere Distanz ‐das sind die Schritte, die den rechts schematisch gezeigten „molekularen Pendelbusverkehr”…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpiroconjugated intramolecular charge-transfer dyesPrzemyslaw Maslak and Anu ChopraCite this: J. Am. Chem. Soc. 1993, 115, 20, 9331–9332Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October 1993https://pubs.acs.org/…
Abstract Spirobenzopyran units were bound to the side chains of poly ( L ‐glutamic acid) and partially methylated poly( L ‐glutamate)s. The modified polymers were found to exhibit “reverse photochromism” in hexafluoro‐2‐propanol (HFP), so the samples kept in the dark were characterized by an intense absorption band in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a (.mu.-oxo)(.mu.-carboxylato)dimanganese(III) polyimidazole complexKenneth J. Oberhausen, Robert J. O'Brien, John F. Richardson, Robert M. Buchanan, Raman Costa, Jean Marc Latour, Hui Lien Tsai, and David N. HendricksonCite this: Inorg. Che…
Abstract The long range orientational order of a liquid crystal is one of its prime characteristics. Before the extent of this order can be measured, however, it is necessary to define what is meant by the orientational order. This can be achieved in a variety of ways the most pragmatic of which is via the order param…
High spin ↔ low spin electronic spin crossovers may be observed in a number of transition metal complexes when the ligand-field and electron-pairing energies happen to be comparable in magnitude. They are obtained under the effect of an external perturbation such as a variation of temperature, a variation of pressure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphocyanine: an expanded tetrapyrrolic macrocycleDavid Dolphin, Steven J. Rettig, Hang Tang, Tilak Wijesekera, and Lily Yun XieCite this: J. Am. Chem. Soc. 1993, 115, 20, 9301–9302Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and growth kinetics of large sodium chlorate crystals grown in the presence and absence of sodium dithionate impurityR. Ristic, J. N. Sherwood, and K. WojciechowskiCite this: J. Phys. Chem. 1993, 97, 41, 10774–10782Publication Date (Print):October 1, 1993Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface enrichment in polystyrene/poly(vinyl methyl ether) blends. 3. An analysis of the near-surface composition profileJ. M. G. Cowie, B. G. Devlin, and I. J. McEwenCite this: Macromolecules 1993, 26, 21, 5628–5632Publication Date (Print):October 1, 1993Publication History…
A hybrid spectral/FDTD (finite-difference-time-domain) method is introduced for the analysis of electromagnetic wave propagation in anisotropic, inhomogeneous, periodic structures. Discrete Fourier series representations for the field components are used for the spectral calculation of spatial derivatives along the ax…
Abstract In this study, styrene‐(ethylene‐co‐butylene)‐styrene (SEBS) triblock copolymer (Kraton G‐1652) was modified with maleic anhydride (MA). The maleated SEBS was used as compatibilizer for the blends of Nylon 6 (PA6) and SEBS. The morphology and impact strength of the blends were measured as functions of concent…
The structure of zeolite ZSM-23 (structure-type code MTT) loaded with NH4F [ao = 11.129 (1), bo = 5.025 (1) and Co = 21.519 (1) Å and β = 89.85 (4)°] was refined from high-resolution synchrotron X-ray powder data. The Rietveld refinement converged in space group P1211 (No. 4) to RF = 0.090 and Rwp = 0.085, confirming…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptically active allylsilanes. 17. Preparation of silafunctional allylsilanes by palladium-catalyzed silylation of allylic chlorides with 1,1-dichloro-1-phenyl-2,2,2-trimethyldisilaneYonetatsu Matsumoto, Akira Ohno, and Tamio HayashiCite this: Organometallics 1993, 12, 10, 4…