Materials Literature
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Abstract Structural Fe in ferruginous smectite (sample SWa-1, Source Clays Repository of the Clay Minerals Society) was reduced by a mixture of five Pseudomonas species of bacteria in a defined Fe-free medium to determine the effect of microbial reduction on clay swelling. Iron(II), total Fe, and gravimetric water con…
Abstract Structural and diffraction criteria for distinguishing between t-1M, c-1M, m-1M, and 3T illite varieties are described. The t-1M illite corresponds to a one-layer monoclinic structure with vacant transsites. The c-1M illite has vacant cis-octahedra forming one of two symmetrically independent point systems; t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasma deposition of ultrathin films of poly(2-hydroxyethyl methacrylate): surface analysis and protein adsorption measurementsGabriel P. Lopez, Buddy D. Ratner, Richard J. Rapoza, and Thomas A. HorbettCite this: Macromolecules 1993, 26, 13, 3247–3253Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective reduction of nitrogen oxides (NOx) by ammonia over honeycomb selective catalytic reduction catalystsJiri Svachula, Natale Ferlazzo, Pio Forzatti, Enrico Tronconi, and Fiorenzo BreganiCite this: Ind. Eng. Chem. Res. 1993, 32, 6, 1053–1060Publication Date (Print):Jun…
We discuss the deformation of a fluid droplet in an emulsion under external forces, such as those exerted by contact with neighboring droplets. We find that the deformation energy associated with a small droplet-droplet contact scales as f 2 ln (1/ f ) with the force f exerted between droplets. We consider the equatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic carbon-halogen bond cleavage chemistry by redox-active polyoxometalatesDaryush Sattari and Craig L. HillCite this: J. Am. Chem. Soc. 1993, 115, 11, 4649–4657Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June…
Abstract The anionic polymerization of L ‐lactide in the presence of the sodium poly(ethylene glycol)ate in tetrahydrofuran at 25°C yields “tailored” ABA triblock copolymers having the expected compositions and molecular weights. During the polymerization, a slight racemization of L‐lactide was observed. The water abs…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTEffects of chemically bound, flexible hydrocarbon species on the frictional properties of diamond surfacesJ. A. Harrison, C. T. White, R. J. Colton, and D. W. BrennerCite this: J. Phys. Chem. 1993, 97, 25, 6573–6576Publication Date (Print):June 1, 1993Publication History Publish…
We have previously shown that asparagine synthetase (AS) mRNA expression can be dramatically up-regulated by asparagine deprivation in ts11 cells, mutants of BHK hamster cells which encode a temperature-sensitive AS. The expression of AS mRNA was also induced upon starvation for one of several essential amino acids in…
We observed spontaneous hexagon formation in the transverse profile of a continuous-wave laser beam retroreflected by a single planar mirror onto a thin film of nematic liquid crystal. We measured the dependence of the threshold intensity and the spatial period of the pattern on the film-to-mirror distance.
Abstract The present experience of the electrochemical dissolution of silicon and previous assumptions upon the mechanism are briefly reviewed. A new model is developed which explains how the coverage of the surface by hydrogen can be maintained in spite of the continuous anodic dissolution.
Using Hartree–Fock ab initio or semiempirical Austin model 1 (AM1) techniques to estimate geometries and an intermediate neglect of differential overlap/configuration interaction (INDO/CI) technique to calculate electronic transition energies, we examine the nature of the lowest singlet excited states in thiophene oli…
The formation of adsorbed films at the free surface of aqueous solutions of sodium hexadecanoate was observed by microscopy at the Brewster angle. A phase transition between a gas and a tilted phase occurs during these slow formations. The tilt of the molecules creates an observable optical anisotropy. We observed cir…
Recently reported light-scattering studies of ${\mathrm{CaKNO}}_{3}$ and Salol are reanalyzed, using the extended version of the mode-coupling theory of the liquid-glass transition including activated transport or hopping effects. Problems found in the original fits due to the neglect of hopping terms are largely corr…
MEED (maximum-entropy electron density) is a program package to calculate the electron-density distribution from a set of structure-factor data by the maximum-entropy method. MEED is an upgraded version of the original maximum-entropy program, MEMTARO, which was used in the first study to use the maximum-entropy metho…
Preface Introduction 1. Fundamentals of macromolecular crystallography 2. Fundamentals of macromolecular structure 3. Sources and properties of synchrotron radiation 4. Synchrotron radiation instrumentation 5. Monochromatic data collection 6. The Laue method 7. Diffuse X-ray scattering from macromolecular crystals 8.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular photoinduced charge separation and charge recombination of the product ion pair states of a series of fixed-distance dyads of porphyrins and quinones: energy gap and temperature dependences of the rate constantsTsuyoshi Asahi, Masaya Ohkohchi, Ryohzi Matsusaka…
STRAT is a Fortran program to optimize the efficiency of data collection on an X-ray area detector system, starting with the crystal in any arbitrary alignment. The high speed of the algorithm makes it possible to select the `best' combination of crystal rotations from a large list of possibilities. The program is app…
Equilibrium relationships in the system Al 2 O 3 ‐Ce 2 Si 2 O 7 in inert atmosphere have been investigated in the temperature range 900° to 1925°C. A simple eutectic reaction was found at 1375°C and 51 mol% Ce 2 Si 2 O 7 . A high‐low polymorphic transformation in Ce 2 Si 2 O 7 was observed at 1274°C. New XRD patterns…
Abstract Computer simulations of the molecular motion of polymer chains in the presence of a strong nematic field were carried out by the method of Brownian dynamics. Two models were studied: the first model (linear liquid crystal) is a freely jointed chain with rigid bonds, the second model (comb‐like liquid crystal)…