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demerits of various algorithms used in numerical analysis as applied to digital computer programming.Initiating this chapter are the various modes of floating point arithmetic and solution of linear equations using the various matrix methods reported in previous chapters.Eigenvalue and lambda-matrix problems with the…
The deposition process of amorphous hydrogenated carbon (a-C:H) in a 13.56 MHz hydrocarbon glow discharge system is investigated. Mass spectrometry was used to measure the relative abundance of the different ionic species. While there is a strong dependence of the mass spectra on the type of hydrocarbon gas (e.g., ben…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium-51 NMR spectroscopy of tungstovanadate polyanions. Chemical shift and line-width patterns for the identification of stereoisomersMichele A. Leparulo-Loftus and Michael T. PopeCite this: Inorg. Chem. 1987, 26, 13, 2112–2120Publication Date (Print):July 1, 1987Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline poly(organophosphazene)Chulhee Kim and Harry R. AllcockCite this: Macromolecules 1987, 20, 7, 1726–1727Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://pubs.acs.org/doi/10.1021/ma00173a…
The crystallization behavior of polyethylene terephthalate (PET), was investigated under isothermal and dynamic cooling conditions, as a function of molecular weight, polycondensation catalyst system, and polymerization conditions. Crystallization kinetic parameters were calculated for both cases by utilizing Avrami-t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrace determination of nitrogen-containing drugs by surface enhanced Raman scattering spectrometry on silver colloidsEdith L. Torres and J. D. WinefordnerCite this: Anal. Chem. 1987, 59, 13, 1626–1632Publication Date (Print):July 1, 1987Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition and melting behavior of poly(oxy-2,6-dimethyl-1,4-phenylene)Stephen Z. D. Cheng and Bernhard WunderlichCite this: Macromolecules 1987, 20, 7, 1630–1637Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July…
Hydrogels of poly(hydroxyethyl methacrylate) (polyHEMA) homopolymer do not normally support the attachment and growth of mammalian cells. By altering the surface it has been possible to dramatically change this cell-substratum interaction so that vascular endothelial cells can attach and completely populate a polyHEMA…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and spectroscopic properties of an unusual copper(I) dimer having imidazole ligands. A model for the carbonyl derivative of hemocyanin and implications for the structure of deoxyhemocyaninThomas N. Sorrell and A. S. BorovikCite this: J. Am. Chem. Soc. 1…
The pressure equation is derived for fluids containing chain molecules interacting with site–site potentials. Three models are considered: a flexible chain with harmonic potentials for bond-length and bond-angle variations, a flexible chain in the limit as the force constants for the vibrations become infinite, and a…
An analysis of interfacial energies in a solid‐liquid system showed that complete penetration of a liquid along grain boundaries in a microstructure forming during liquid‐phase sintering is not necessarily associated with complete wetting or spreading at the solid‐liquid interface. Investigations were made on the pene…
Calmodulin has been shown to interact with high affinity with muscle phosphofructokinase (Mayr, G. W. (1984) Eur. J. Biochem. 143, 513-520, 521-529). In this study, direct binding measurements indicated that each of the two subunits of dimeric phosphofructokinase bound two calmodulins with Kd values of about 3 nM and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure from x-ray scattering: the disordered open connected model of microemulsionsThomas N. Zemb, S. T. Hyde, Paul Joel. Derian, Ian S. Barnes, and Barry W. NinhamCite this: J. Phys. Chem. 1987, 91, 14, 3814–3820Publication Date (Print):July 1, 1987Publication Histo…
The change in mechanical properties of a fiber‐reinforced ceramic from notch insensitivity at room temperature to notch sensitivity at elevated temperature has been investigated. The change in behavior has been attributed primarily to a correspondingly large variation in the shear resistance of the fiber/matrix interf…
The preparation of a cubic boron nitride film by physical vapor deposition processes has been investigated. The electron beam guns of a hollow cathode discharge type and a conventional high-voltage type were used for the boron evaporation source. The stoichiometric boron nitride film could be obtained by using a gas a…
Abstract The miscibility of bisphenol‐A polycarbonate (PC) with poly(methyl methacrylate) (PMMA) has been reexamined using differential scanning calorimetry (DSC) and optical indications for phase separation on heating, i.e., lower critical solution temperature (LCST) behavior. Various methods have been used to prepar…
This review describes the synthesis of 1,3-tetrachalcogenafulvalenes and 1,2-tretrathiafulvalenes, the chemical transformation of substituents, reactions of the ring system, and the synthesis of polymers with 1,3-tetrathiafulvalene units in the backbone and in the side chain. 1,2-And 1,3-tetrachalcogenafulvalenes synt…
A package of programs has been developed for efficient restrained least-squares refinement of macromolecular crystal structures. The package has been designed to be as flexible and general purpose as possible. The process of refinement is divided into basic units and an independent computer program handles each task.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of iron porphyrins with trifluoromethyl, trifluoromethylperoxy, and tribromomethylperoxy radicalsD. Brault and P. NetaCite this: J. Phys. Chem. 1987, 91, 15, 4156–4160Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published iniss…
The influence of the plasticizers, di-(2-ethylhexyl)phthalate (DEHP) and tri-(2-ethylhexyl)trimellitate (TOTM), on granulocyte function was examined. Polyvinyl chloride (PVC) bags with DEHP (DEHP-PVC) leaked DEHP into plasma, but TOTM did not dissolve in plasma under the same conditions. Glow discharge treatment inhib…