Materials Literature
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We report computer simulations of a three-dimensional system of semiflexible polymers consisting of hard spherocylinders connected by joints of variable flexibility. In these simulations, we have studied the influence of molecular flexibility on the location of the isotropic-nematic phase transition. A comparison of o…
A complex of polyhydroxybutyrate (PHB), Ca2+, and inorganic polyphosphate (polyP) was proposed as the membrane component responsible for competence for DNA entry in Escherichia coli (Reusch, R. N., and Sadoff, H. L. (1988) Proc. Natl. Acad. Sci. U.S.A. 85, 4176-4180). While chemical and immunological assays and 1H NMR…
In a spinal turtle, unilateral stimulation in the rostral scratch receptive field elicited rhythmic fictive rostral scratching in ipsilateral hindlimb motor neurons; contralateral hip motor activity was also rhythmic and out-of-phase with ipsilateral hip motor activity. When left and right rostral scratch receptive fi…
Sol‐gel processing of yields amorphous aerogels (ARG) and xerogels (XRG) that serve as high capacity intercalation hosts for lithium ions. The insertion process is highly reversible in both the aerogel and xerogel form, suggesting that they are attractive for rechargeable lithium batteries and other electrochemical de…
The ac impedance response of a symmetrically bathed membrane consisting of a conducting polymer is modeled. The model is an extension of a recent one proposed for a conducting polymer film contacting an electronic and an ionic conductor on its two faces (modified electrode geometry) and takes into account both diffusi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical Properties of New Photolabile cAMP Derivatives in a Physiological Saline SolutionToshiaki Furuta, Hiromi Torigai, Masazumi Sugimoto, and Michiko IwamuraCite this: J. Org. Chem. 1995, 60, 13, 3953–3956Publication Date (Print):June 1, 1995Publication History Publ…
Abstract Methanol, in combination with a non‐ionic phosphazene base, was used to initiate the polymerization of octamethylcyclotetrasiloxane. In bulk, an instantaneous and large increase in viscosity was observed upon addition of the initiator. In toluene solution, the equilibrium state was reached in approximately 1…
A shear flexible shell theory is used to predict the drape of fabrics. The fabric is considered a continuous, orthotropic medium. Finite element formulations are used to numerically solve governing equations under specific boundary conditions. Initially, the fabric is assumed to be a flat plate, which goes through lar…
Proteins, like DNA, are subject to various forms of damage that can render them non-functional. Conformational changes and covalent chemical alterations occur spontaneously, and the rates of these reactions can be increased by environmental stresses such as heat, oxidative agents, or changes in pH or osmotic condition…
It is demonstrated that electroluminescent porous silicon (PS) diodes operate as surface-emitting cold cathodes. The PS diode is composed of a semitransparent thin Au film, PS layer, n-type Si substrate and ohmic contact. When a sufficient positive bias voltage is applied to the Au contact in vacuum, the diode uniform…
We report on the synthesis and optical characterization of hydrazone derivatives developed for second-order nonlinear optics. Electric-field-induced second harmonic generation (EFISH) as well as semiempirical quantum-chemical computations have been carried out to investigate and explain the nonlinear optical propertie…
Abstract Isotherms were obtained for nitrogen adsorption and desorption on seven halloysite-rich samples from New Zealand and Western Australia. Calculations from these isotherms indicate that halloysites with mainly small particles (< c . 0.08 μm in width) had abundant cylindrical pores with narrow size distributi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Observation of Three-Dimensional Bicontinuous Structure Developed via Spinodal DecompositionHiroshi Jinnai, Yukihiro Nishikawa, Tsuyoshi Koga, and Takeji HashimotoCite this: Macromolecules 1995, 28, 13, 4782–4784Publication Date (Print):June 1, 1995Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Microstructure during Shear Alignment in a Polystyrene-Polyisoprene Lamellar Diblock CopolymerV. K. Gupta, R. Krishnamoorti, J. A. Kornfield, and S. D. SmithCite this: Macromolecules 1995, 28, 13, 4464–4474Publication Date (Print):June 1, 1995Publication History…
Fractals have been used extensively to provide a description and to model mathematically many of the naturally occurring sampler shapes, such as coastlines, mountain ranges, clouds, etc., and have also received increased attention in the field of image processing, for purposes of segmentation and recognition of region…
ABSTRACT: Poly[4-[2-(methacryloyloxy)ethyllazobenzenel (pMEA) has been synthesized and its revers-ible optical storage properties tested in comparison with previously reported electron-donor-electron-acceptor substituted azobenzene-containing polymers. The cis-trans thermal isomerization rate is fairly slow in pMEA, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcylperoxo-Iron(III) Porphyrin Complexes: A New Entry of Potent Oxidants for the Alkene EpoxidationKenji Machii, Yoshihito Watanabe, and Isao MorishimaCite this: J. Am. Chem. Soc. 1995, 117, 25, 6691–6697Publication Date (Print):June 1, 1995Publication History Published onli…
Abstract Continuous kinetics of thermal degradation of poly (styrene‐allyl alcohol) (PSA) in solution are explored theoretically and experimentally. Thermal degradation experiments for PSA of number‐average molecular weight 1,640 in t‐butanol solution were conducted in a steady‐state flow reactor at 6.8 MPa and 403–47…
The dielectric spectrum of the antiferroelectric smectic C∗ phase exhibits a low and a high frequency absorption peak (Pl, Ph) which have been studied as a function of temperature and bias electric field. Measurements from 10 Hz to 10 MHz were carried out with smectic layers parallel and quasi-perpendicular to the cel…
Other| June 01, 1995 Al K-edge XANES spectra of aluminosilicate minerals Dien Li; Dien Li University of Western Ontario, Department of Chemistry, London, ON, Canada Search for other works by this author on: GSW Google Scholar G. M. Bancroft; G. M. Bancroft Search for other works by this author on: GSW Google Scholar M…