Materials Literature
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The bioactivity-directed isolation of deoxylapachol [I] from a New Zealand brown alga, Landsburgia quercifolia, is described. Compound I was active against P-388 leukemia cells (IC50 0.6 microgm/ml) and was also antifungal. 1,4-Dimethoxy-2-(3-methyl-2-butenyl)-naphthalene [3] was the major low polarity component of ex…
An optimal set of thermodynamic functions for the ZrO 2 ─YO 1.5 system are obtained using phase diagram and thermodynamic data. The liquid is described by a subregular solution model. Both cubic ZrO 2 and YO 1.5 solid solutions are regarded as one cubic solution, which is also treated as a subregular solution. The ord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of poly(p-phenylene sulfide) growth from p-dichlorobenzene and sodium sulfideDarryl R. Fahey and Carlton E. AshCite this: Macromolecules 1991, 24, 15, 4242–4249Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 Ju…
Controlled expansion of high purity carbon dioxide through a nozzle forms a high velocity ‘‘snow’’ stream that effectively removes both particulate and thin film contaminants from silicon wafer surfaces [W. Whitlock, Presented at the 20th Annual Meeting of the Fine Particle Society, Boston, MA, August 22, 1989 (unpubl…
The phoochromic properties of vapor-deposited amorphous tungsten oxide (a-WO 3 ) films have been studied from the viewpoint of their dependence on film structure and water content in the films. The a-WO 3 films, prepared under different deposition conditions and postannealing temperatures, were irradiated with uv ligh…
The authors describe the results of an investigation into the withstand voltage characteristics of an insulator string covered with snow or ice and the application of these results to the insulation design and maintenance of a transmission line in a heavy snow area. It was found that the characteristics of withstand v…
The guanosine derivatives d(pG), d(GpG), d(GpGpG), d(GpGpGpG), and d(GpGpGpGpGpG), dissolved in water, give rise to cholesteric and hexagonal mesophases. These phases were investigated by X-ray diffraction, optical microscopy, and circular dichroism. The building block of these phases is a chiral rod-shaped aggregate…
Since titanium is being used for various biomedical applications requiring enhanced blood compatibility, which may be partly due to its extremely stable oxide layer, an attempt is made here to understand the effect of oxide layer thickness on protein adsorption. Different thickness of oxide layers have been coated on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalysis of oligo(p-phenylenes): photoreductive production of hydrogen and ethanol in aqueous triethylamineShinjiro Matsuoka, Hiroyuki Fujii, Taisuke Yamada, Chyongjin Pac, Akito Ishida, Setsuo Takamuku, Mitsuhiro Kusaba, Nobuaki Nakashima, Shozo Yanagida, and Cite thi…
For pt.VI see ibid., vol.7, no.3, p.9 (1991) Online partial-discharge (PD) tests for monitoring the condition of the solid dielectric insulation in high-voltage equipment are discussed. Sources of external electrical noise are identified, as are attributes of PD and noise that are helpful in drawing distinctions betwe…
In this paper the size effect of lattice-dislocation stability in nanocrystals (NC's) caused by a strong interaction of dislocations with interfaces is analyzed. When the nanocrystallite size l becomes less than the characteristic length \ensuremath{\Lambda}, a substantial dislocation redistribution in the nanocrystal…
The dielectric properties of grain-oriented thin-film vanadium dioxide (VO2) on single-crystal sapphire have been measured as a function of temperature across the phase transformation at 68 °C. The properties of the low- and high-temperature phases were determined by measuring the millimeter-wave transmittance and pha…
We compute all the three-dimensional quasicrystallographic space groups with $n$-fold axial point groups and standard lattices by a method that treats crystals and quasicrystals on an equal footing. We do not rely on projecting higher-dimensional crystallographic space groups, our results are valid for arbitrary $n$,…
The generic redox reaction of a class of linear sulfur‐containing redox polymerization electrodes can be described as ‒ SRS ‒ n + n 2 e − ⇄ n − SRS − that is, the polymer electrode can be progressively depolymerized, leading ultimately to monomeric anions, as the sulfur‐sulfur bridges between the organic R groups are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron donor-electron acceptor interactions in bimetallic surfaces: theory and XPS studiesJose A. Rodriguez, Robert A. Campbell, and D. Wayne GoodmanCite this: J. Phys. Chem. 1991, 95, 15, 5716–5719Publication Date (Print):July 1, 1991Publication History Published online1…
Methanogens can use H(2) produced by cathodic depolarization-mediated oxidation of elemental iron to produce methane. Thermodynamic consideration of the cathodic depolarization mechanism predicts more oxidation of Fe at lower pH. Methanogenic responses to pH by Methanococcus deltae, Methanococcus thermolithotrophicus,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(1-adamantyl methacrylate): effects of the adamantyl group on radical polymerization kinetics and thermal properties of the polymerAkikazu Matsumoto, Satoshi Tanaka, and Takayuki OtsuCite this: Macromolecules 1991, 24, 14, 4017–4024Publi…
Abstract In many important applications, an elastomer is subjected to repeated deformations of sufficient magnitude and frequency to lead to generation of considerable heat and (depending on the rate of heat removal) of a significant rise in temperature. The purpose of this review is to examine the mechanisms of heat…
We have used Brillouin scattering to measure the temperature dependence of the sound velocities of the longitudinal and transverse vibrational modes in various directions in small single crystals of monoclinic ZrO 2 . Using these velocities and the Christoffel equation, we have calculated the 13 elastic stiffness modu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleChain-length dependence of the glass transition temperatureK. O'Driscoll and R. Amin SanayeiCite this: Macromolecules 1991, 24, 15, 4479–4480Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July 1991https://pubs.acs.org/doi/1…