Materials Literature
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The dipole-dipole-quadrupole (B) and second dipole (\ensuremath{\gamma}) hyperpolarizabilities and the dipole (${\mathrm{\ensuremath{\alpha}}}_{1}$) and quadrupole (${\mathrm{\ensuremath{\alpha}}}_{2}$) polarizabilities are calculated for the ground states of the magnesium and calcium atoms and the aluminum cation. Th…
An isocitrate dehydrogenase able to function with either NADP or NAD as coenzyme was purified to homogeneity from cell-free extracts of the purple photosynthetic eubacterium Rhodomicrobium vannielii using a rapid two-step procedure involving dye-ligand affinity chromatography. The enzyme was obtained in 60% yield with…
Abstract The protonation/deprotonation reaction of polyaniline in the emeraldine oxidation state (PANI‐E) is discussed on the basis of membrane‐equilibrium considerations. The important role of the partitioning of H + between the polymer and the bathing solution is pointed out. The concentration of (free) H + in the p…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopological control of electron localization in .pi.-conjugated polyarylmethyl carbopolyanions and radical anionsSuchada Utamapanya and Andrzej RajcaCite this: J. Am. Chem. Soc. 1991, 113, 24, 9242–9251Publication Date (Print):November 1, 1991Publication History Published on…
Highly Magnetostrictive materials such as Tb/sub 0.3/Dy/sub 0.7/Fe/sub 2/, commercially known as Terfenol-D, have been used to date in a variety of devices such as high-power actuators and linear motors. The larger magnetostriction available in twinned single-crystal Terfenol-D, approximately 2000 p.p.m. at moderate m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPredicted geometries of porphyrin excited states and radical cations and anionsKristine Prendergast and Thomas G. SpiroCite this: J. Phys. Chem. 1991, 95, 24, 9728–9736Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1…
Energy-filtered convergent-beam electron diffraction (CBED) patterns were obtained from a 10A˚region of the specimen in a scanning transmission electron microscope (STEM) equipped with a digital image-acquisition system. For crystalline silicon, plasmon scattering causes a blurring of the low-order Bragg beams. Signif…
Linearized measurements of the coverage dependent desorption rates of CO from Rh(111) were made with a novel three molecular beam apparatus. To measure these isothermal and essentialy isosteric rates we introduce a new kinetic response amplifier, namely time-resolved specular helium scattering, which makes use of the…
The mathematical techniques used in the derivation of intensity statistics and of probabilistic relations between structure factors for single-crystal data are here extended so as to encompass the phenomenon of intensity overlap, which is encountered with diffraction data collected from microcrystalline powders or fro…
Abstract An interlaboratory study of the calibration of the intensity scales of Auger electron spectrometers has been completed. Thirty‐eight respondees have completed intensity measurements using pre‐calibrated reference materials of Cu, Ag and Au in either the direct or differential modes. The reference material cal…
The origin of reaction and substrate specificity and the control of activity by protein-protein interaction are investigated using the tryptophan synthase alpha 2 beta 2 complex from Salmonella typhimurium. We have compared some spectroscopic and kinetic properties of the wild type beta subunit and five mutant forms o…
The subsolidus phase relationships in the system Si,Al,Y/N,O were determined. Thirty‐nine compatibility tetrahedra were established in the region Si 3 N 4 ─AIN─Al 2 O 3 ─Y 2 O 3 . The subsolidus phase relationships in the region Si 3 N 4 ─AIN─YN─Y 2 O 3 have also been studied. Only one compound, 2YN:Si 3 N 4 , was con…
Yttria-stabilized zirconia (YSZ) thin films were deposited by reactive magnetron sputter deposition from a composite Zr–Y target in Ar–O2 mixtures. Hysteresis was observed as a function of oxygen flow rate f. For a discharge current of 0.4 A and a total pressure P of 5 mTorr, for example, the target oxidized at f&…
A rapid scanning spectroscopic ellipsometer with optical multichannel detection has been employed for in situ monitoring and analysis of pyrrole electropolymerization on a gold electrode. Spectra were collected over the energy range of 1.5–3.3 eV as a function of time during chronoamperometric deposition (0.6 V vs. SC…
We report high-resolution electron-energy-loss spectra at 14.3 and 19 eV incident electron energy for electronic excitations in multilayer films of amorphous ice. The lowest electronic transition has its threshold at 7.3 eV and its maximum at 8.5 eV. It is followed by a broad shoulder around 10.4 eV and a rise above 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical preparation of ultrathin polypyrrole film at microarray electrodesM. Nishizawa, M. Shibuya, T. Sawaguchi, T. Matsue, and I. UchidaCite this: J. Phys. Chem. 1991, 95, 23, 9042–9044Publication Date (Print):November 1, 1991Publication History Published online1 M…
We investigated the effects of transforming growth factor-beta 1 (TGF-beta 1) and epidermal growth factor (EGF) on the protein synthesis and production of collagen in cultured smooth muscle cells (SMCs) from the aortic media of pigs. SMCs were cultured as monolayers on plastic as well as in three-dimensional collagen…
The animal fatty acid synthase is a multifunctional protein with a subunit molecular weight of 260,000. We recently reported the expression and characterization of the acyl carrier protein and thioesterase domains of the chicken liver fatty acid synthase in Escherichia coli. In order to gain insight into the mechanism…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic and electrochemical characterization of nickel .beta.-oxoporphyrins: identification of nickel(III) oxidation productsPatricia A. Connick and Kathleen A. MacorCite this: Inorg. Chem. 1991, 30, 24, 4654–4663Publication Date (Print):November 1, 1991Publication His…