Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Dissolved Gas and Salt on the Hydrophobic Force between Polypropylene SurfacesLaurence Meagher and Vincent S. J. CraigCite this: Langmuir 1994, 10, 8, 2736–2742Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1…
The behavior of electromigration-induced voids in narrow, unpassivated aluminum interconnects is examined, using scanning electron microscopy. Some electromigration tests were interrupted several times in order to observe void nucleation, void growth, and finally the failure of the conductor line. It is found that voi…
Time-resolved and steady-state optical data are presented for a series of substituted free-base porphyrins. The porphyrins are grouped into "normal" and "perturbed" categories based on observed photophysical behavior, and the distinctions between the two classes correlate well with the conformations of the molecules.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTert-Butylaluminum Hydroxides and Oxides: Structural Relationship between Alkylalumoxanes and Alumina GelsC. Jeff Harlan, Mark R. Mason, and Andrew R. BarronCite this: Organometallics 1994, 13, 8, 2957–2969Publication Date (Print):August 1, 1994Publication History Published…
Polyhydroxyalkanoate (PHA) synthase has been expressed in Escherichia coli by reengineering the 5'-end of the wild-type (wt) gene and subsequent transformation of this gene into protease-deficient E. coli UT5600 (ompT-). Induction with IPTG results in soluble PHA synthase, which is approximately 5% of the total protei…
Chitin is one of the most abundant polysaccharides found in nature. It is often considered a cellulose derivative although it does not occur in organisms producing cellulose. Cellulose consists of β-(1→4)-D-glucopyranose units. In contrast, chitin has the same backbone but the 2-hydroxy has been replaced by an acetami…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Enantioselective, Catalytic Epoxidation of Trisubstituted OlefinsBridget D. Brandes and Eric N. JacobsenCite this: J. Org. Chem. 1994, 59, 16, 4378–4380Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994…
Shake-and-bake is a direct-methods phasing algorithm for structure determination based on the minimal principle. SnB is a program based on shake-and-bake that has been used successfully to solve more than a dozen structures in a variety of space groups. The focus of this paper is on the details of this program, includ…
${\mathrm{LaCoO}}_{3}$ exhibits two magnetic-electronic transitions, one near 90 K and a second near 500 K. A previous study of the paramagnetic scattering using polarized neutrons demonstrated that the low-temperature transition is associated with the thermal excitation of ${\mathrm{Co}}^{3+}$ ions from the low-spin…
A reduced variable conformational sampling strategy for macromolecules based on molecular dynamics in torsion angle space is evaluated using crystallographic refinement as a prototypical search problem. Bae and Haug's algorithm for constrained dynamics [Bae, D.S., Haug, E.J. A recursive formulation for constrained mec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Novel Oriented Transparent Films of Layered Silica-Surfactant NanocompositesMakoto OgawaCite this: J. Am. Chem. Soc. 1994, 116, 17, 7941–7942Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https…
1. The photolabile Ca2+ chelator DM-nitrophen was injected into crayfish motor neuron terminals and photolyzed with light flashes of different intensity to determine the cooperativity of Ca2+ action in releasing neurotransmitter. 2. Each flash elicited a phasic postsynaptic response resembling an excitatory junctional…
A model for the oxidation kinetics of SiC‐coated 2D C/SiC composites is developed on the basis of mechanisms derived from TGA data (between 700° and 1500°C in dry oxygen or air, P = 100 kPa). Carbon/oxygen reaction, gas phase diffusion through microcracks present in the external SiC coating, and silica growth are the…
A model of hard spherocylinders exhibiting Brownian dynamics in a solvent is investigated by Brownian dynamics simulations. Long-time translational and rotational self-diffusion coefficients are calculated in the disordered phase over the whole range of densities and a ratio p of total length to width ranging from 1 t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Coupling in Homo- and Heterodinuclear Complexes CuIIM [M = Cr(III), Mn(III), Mn(II), Fe(III), Co(III), Co(II), Ni(II), Cu(II), Zn(II)]. Synthesis, Structures, and Spectroscopic PropertiesFrank Birkelbach, Manuela Winter, Ulrich Floerke, Hans-Juergen Haupt, Christian…
Profile and Bragg R values are discussed with respect to different versions of the Rietveld program. The R values calculated from an exemplary neutron diffraction pattern are compared. Results obtained by a modified treatment of background and by a simplified method to decompose an observed pattern into Bragg intensit…
The elastic modulus ( E ), the critical strain energy release rate ( G c ), and the flexural strength (σ) have been determined for two partially dense alumina bodies produced from the same powder but with different initial densities. The mechanical properties were measured for specimens fabricated at four different re…
The oxidation behavior of a 2D woven C/SiC composite partly protected with a SiC seal coating and heat‐treated (stabilized) at 1600°C in inert gas has been investigated through an experimental approach based on thermogravimetric analyses and optical/electron microscopy. Results of the tests, performed under flowing ox…
We have observed a coherent oscillation of zone-folded acoustic phonons in GaAs-AlAs superlattices for the first time by means of a femtosecond time-resolved pump-probe technique. The oscillatory component in the time-resolved reflection signal corresponds to the upper branch (${B}_{2}$ symmetry) of the first-order do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward "Willowlike" Thermotropic DendrimersVirgil Percec, Peihwei Chu, and Masaya KawasumiCite this: Macromolecules 1994, 27, 16, 4441–4453Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org…