Materials Literature
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Thin-walled expanded polytetrafluoroethylene (ePTFE), woven Dacron and gelatin-impregnated Dacron (Gelseal) vascular grafts were compared, the grafts being coated with three different matrices: collagen IV, fibronectin and preclot matrix. In addition, untreated ePTFE and Gelseal were examined. The graft segments, coat…
Stabilized zirconia, when exposed at high temperature to a reducing atmosphere, becomes colored, and a pronounced room-temperature ESR signal appears. The concentration of the color centers was determined by optical absorption in the uv--visible range, and the concentration of the paramagnetic centers was determined b…
Responses of rat embryonic septal cells to reconstituted basement membrane, laminin, and laminin A chain-derived synthetic peptides were studied in culture. Dissociated fetal E16/17 septal cells were grown for three days on differently coated plastic substrata. Reconstituted basement membrane (Matrigel), laminin, and…
Superplastic deformation of alumina ceramics was studied at 1400° to 1450°C and at a strain rate of 4 × 10 −5 to 5 × 10 −4 s −1 . MgO and ZrO 2 were introduced to suppress dynamic grain growth. The latter was especially effective; grain growth was minimal in 10‐vol%‐ZrO 2 ‐containing material. Both materials were supe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTYttrium and lanthanum silyloxide complexesMichael J. McGeary, Paul S. Coan, Kirsten Folting, William E. Streib, and Kenneth G. CaultonCite this: Inorg. Chem. 1991, 30, 8, 1723–1735Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published i…
We have found that a perovskite LaVO 3 exhibits a cubic-to-orthorhombic transformation, immediately followed by a magnetic transition into a large diamagnetic state below about 135 K. Resistivity measurement revealed that the compound is a semiconductor in the whole temperature range investigated, with a slightly larg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectra of two isomeric dioxygen adducts of iron(II) porphyrins and .pi.-cation radical and nonradical oxoferryl porphyrins produced in dioxygen matrixes: simultaneous observation of more than seven oxygen isotope sensitive bandsLeonard M. Proniewicz, Insook…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGel/sol and liquid-crystalline transitions in solution of a rigid-rod polyimideStephen Z. D. Cheng, Sung Koo Lee, Jeffrey S. Barley, Steven L. C. Hsu, and Frank W. HarrisCite this: Macromolecules 1991, 24, 8, 1883–1889Publication Date (Print):April 1, 1991Publication History…
The development of biocompatible, controlled release systems for macromolecules has provided the opportunity for researchers and clinicians to target and deliver, on site, biologically active factors. This advance has also facilitated the purification and characterization of a number of important biomolecules. These s…
Cristallisation dans A2 1 am avec a=5,4398, b=5,3941, c=25,099 A, Z=4; affinement jusqu'a R=0,0295. Ce compose se decrit, a temperature ambiante, comme une modulation commensurable d'une structure parent Emmm. Le mode displacif F2mm, associe a la ferroelectricite du compose, est different des autres modes Amam et Abam…
A transport and reaction model of a low-pressure, high-frequency (13.56 MHz) CH/sub 4/ plasma used for diamondlike carbon (a-C:H) deposition was developed. The model includes reactions among four molecular species (CH/sub 4/, C/sub 2/H/sub 6/, C/sub 2/H/sub 4/, and H/sub 2/), five radicals and atom (CH/sub 3/, CH/sub…
Abstract The hydroxy acid-aided process using citric or malic acid produced a perovskite phase at relatively low calcination temperatures. The adjustment of the starting solution to an appropriate pH value in the malic acid-aided process resulted in reducing the temperature for the formation of single-phase perovskite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of nitric acid in solid argon: the infrared absorption of peroxynitrous acid (HOONO)Bing Ming Cheng, Jeng Wen Lee, and Yuan Pern LeeCite this: J. Phys. Chem. 1991, 95, 7, 2814–2817Publication Date (Print):April 1, 1991Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin polymerization by vanadium-containing polyhedral oligometallasilsesquioxanesFrank J. Feher, John F. Walzer, and Rusty L. BlanskiCite this: J. Am. Chem. Soc. 1991, 113, 9, 3618–3619Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiempirical study of electron exchange interaction in organic high-spin .pi.-systems. Classifying structural effects in organic magnetic moleculesPaul M. Lahti and Andrew S. IchimuraCite this: J. Org. Chem. 1991, 56, 9, 3030–3042Publication Date (Print):April 1, 1991Public…
The adsorption and reaction of HCOOH on the (0001)-Zn surface of ZnO was studied using high resolution electron energy loss spectroscopy (HREELS). Fourier deconvolution was used to remove phonon-phonon and phonon-adsorbate combination losses from the HREEL spectra of the adsorbate-covered surface, allowing adsorbed sp…
A method is developed to size the particles of contaminants in insulation of HV crosslinked polyethylene cable by using a Fraunhofer far-field in-line holographic technique with no need to cut the insulation into thin slices. The maximum thickness of the sample is 4.0 cm, when a resolution of 50 mu m is obtained. The…
To properly control radioiodine (129I) when reprocessing nuclear fuels, it is important to understand the interaction between iodine and the insoluble residue produced during the dissolution of spent fuels.Simulated spent-fuel pellets (∼1 g each) equivalent to spent fuel with a burnup of 5% fima were dissolved in 4.1…
Abstract A review of the development and application of extended X‐ray absorption fine structure (EXAFS) spectroscopy for in situ structural characterization of chemical processes at he electrode surface is presented. The designs of the in situ electrochemical cells developed to date are shown. Applications are presen…
Abstract A procedure for automaied microanalysis is adapted from a correction procedure for bulk samples. A particle size correction, based on the projected diameter of the particle, assumed to be spherical, is implemented when the diameter is less than or equal to the electron interaction diameter. A bulk correction…