Materials Literature
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Abstract Model compounds have been used to determine the mechanism of the reaction of aromatic diamines with aromatic cyclic dianhydrides to form poly(amic acids). Phthalic anhydride was used to model the anhydride functionality, while either 4,4′‐diaminodiphenyl ether or aniline was used for the amine functionality.…
Deuterium (D) and He were ion-implanted into Fe, and the D depth distribution was monitored during linear ramping of temperature. Defects associated with He, possibly small bubbles, were observed to trap the D with an enthalpy of 0.75±0.07 eV. The previously air-exposed Fe surface was a substantial permeation barrier…
Abstract A method for the determination of residual stresses in plastic pipe by layer removal and subsequent slitting is described. Results are analyzed from deflections measured on a high density polyethylene pipe. The use of these data in the calculation of K I around a semi‐elliptical flaw at the pipe wall is then…
Abstract Thermal expansion and anisotropic thermal vibrations are investigated for pure tin, indium, and their intermetallic compounds : In 3 Sn and InSn 4 , below and above room temperature. Measurements are performed with spherically shaped single crystals. The dependences of the lattice parameters on temperature ar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThioether ligation in iron-porphyrin complexes: models for cytochrome cToshio Mashiko, Christopher A. Reed, Kenneth J. Haller, Margaret E. Kastner, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1981, 103, 19, 5758–5767Publication Date (Print):September 1, 1981Publication…
Abstract The stability of untreated and heat‐treated Co and FeT(p‐OCH 3 )PP/Norit BRX (T(p‐OCH 3 )PP = meso‐tetra(p‐methoxy)phenylporphyrin) has been studied under a variety of conditions: in pure electrolyte (6N H 2 SO 4 ), in the presence of H 2 O 2 , and under a current load (O 2 reduction); all at various temperat…
Transition properties of some compounds of the type, n-C n H2n+1N+(CH3)3X-, with n = 10, 12, 14, 18, 22, and X = Cl, Br, and I, were investigated. All these compounds show a solid-solid phase transition with a large enthalpy change in the range of temperature 350 ∼ 400K. The transition behaviors were investigated by t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of isocyanate-based polymers. 1. Kinetics of the thermal dissociation of urethane, oxazolidone, and isocyanurate groupsP. I. Kordomenos and J. E. KrestaCite this: Macromolecules 1981, 14, 5, 1434–1437Publication Date (Print):September 1, 1981Publication His…
Cross-linking with glutaraldehyde with subsequent NaDodSO4-polyacrylamide gel electrophoresis has been introduced as a convenient method for studying the association of oligomeric proteins [Hermann, R., Rudolph, R., & Jaenicke, R. (1979) Nature (London) 277, 243-245]. In the present paper, an improved version of this…
In this paper we report the purification of a protein which is able to catalyze both the proline oxidase and the pyrroline-5-carboxylic acid dehydrogenase activities necessary for the oxidation of proline to glutamic acid. The purification involves the preparation of a crude membrane pellet, detergent solubilization,…
We have observed charge-density-wave (CDW) phase transitions in the cubic spinel structure Cu${\mathrm{V}}_{2}$${\mathrm{S}}_{4}$. At 90 K a CDW forms with a reduced wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}=(\frac{1}{4}\ensuremath{-}\ensuremath{\delta})[110]$. The incommensurability $\ensuremath{\d…
Abstract Proportions of the component layers in randomly interstratified illite-smectites can be determined precisely in the presence of discrete illite if two reflections (at 15–16 and 31–32°2 θ Cu K α ) are strong enough to be measured accurately. The method takes into account the variable thickness of the smectite-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic behavior of automotive catalysts. 1. Catalyst oxidation and reductionRichard K. HerzCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 3, 451–457Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 September 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of a complex with a carbide bridge between two iron atoms from the reaction of (tetraphenylporphyrin)iron(II) with carbon tetraiodideDaniel Mansuy, Jean Pierre Lecomte, Jean Claude Chottard, and Jean Francois BartoliCite this: Inorg. Chem. 1981, 20, 9, 3119–3121Pub…
Abstract Honessite and hydrohonessite from Unst, Shetland, and Linden, Wisconsin, are sulphate-containing members of the pyroaurite group and are analogous to reevesite. The structural formula can be written (Ni 5.55 Mg 0.10 Fe 2.35 3+ )(OH) 16 (SO 4 ) 1.18 . x H 2 O for the Unst material, with sulphate groups replaci…
Abstract The oxygen reduction characteristics of metalloporphyrins adsorbed at monolayer levels on a high surface area carbon, Norit BRX, have been studied in 8 N H 2 SO 4 and also in 6N KOH. In an acid, oxygen reduction activity is found to be correlated with the Me II /Me III redox potential. Most Co complexes have…
Blood compatibility has been studied for hydrophilic polymers such as poly(vinyl alcohol) (PVA), its derivative, and polyethylene grafted with water-soluble monomers. The surfaces in contact with electrolyte solutions have been characterized by measuring the zeta potentials. The study of plasma protein adsorption on t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical characterization of hydrous ferric oxides by x-ray photoelectron spectroscopyDavid T. Harvey and Richard W. LintonCite this: Anal. Chem. 1981, 53, 11, 1684–1688Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue…
Initial results in over 50 patients with stroke suggest that positron images made during continuous inhalation of carbon dioxide labeled with oxygen 15 and molecular oxygen labeled with oxygen 15 provide data on tissue function that may be relevant to acute stroke management. Five cases illustrate the following findin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe nature of organosilane to silica-surface bondingThomas G. Waddell, Donald E. Leyden, and Mary T. DeBelloCite this: J. Am. Chem. Soc. 1981, 103, 18, 5303–5307Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 Septem…