Materials Literature
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The polarized fluorescence of a total of 12 ${\mathrm{Ho}}^{3+}$ ion centers present in ${\mathrm{CaF}}_{2}$- and ${\mathrm{SrF}}_{2}$-type crystals and having a variety of ${\mathrm{Ho}}^{3+}$ ion symmetries has been analyzed to give possible model assignments. In contrast to the earlier results for ${\mathrm{SrF}}_{…
The precipitation of oxygen has been investigated for 2 MeV electron irradiated silicon samples, with irradiation doses 1015–1018 cm−2, at an annealing temperature of 900 °C for up to 444 h. The samples initially contained either different concentrations of the vacancy-oxygen (VO) center created at the irradiation, or…
Abstract Results on solution‐blended poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI) blends are reported. Dichloroacetic acid was used as the cosolvent for blending. PEEK and PEI are confirmed to be miscible in the melt. The glass transition, T g , behavior obeys the simple Fox equation or the Gordon‐Taylo…
The tissue distribution and normal tissue toxicity of cisplatin (cDDP) administered as poly-lactide-co-glycolide (PLAGA) microspheres, developed for loco-regional administration of cDDP to the liver, were studied in Wag/Rij rats. Venoportal administration of this formulation resulted in a reduction in total systemic a…
The compressive creep behavior of single‐crystal 6H α‐SiC was measured for orientations parallel to and at 45° to [0001]. Deformation of the 45° orientation was dominated by basal slip. Steady‐state creep rates above 10 ‐7 /s were measured at temperatures as low as 800°C. An activation energy of 277 kJ/mol and a stres…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectrum of allyl and allyl-d5 radicals: the B[12A1] .rarw. X[12A2], C[22B1] .rarw. X[12A2], and D[12B2] .rarw. X[12A2] band systemsJoel A. Blush, David W. Minsek, and Peter ChenCite this: J. Phys. Chem. 1992, 96, 25, 10150–10154Publication Date (Print):December 1…
The liquid wetting and retention properties of cotton, polyester, and their blends and other woven fabrics, each containing a single fiber type, were investigated using a previously established method. Several aspects of liquid retention properties of woven fabrics were discussed, i.e., distribution of liquid uptake,…
Poly-β-hydroxybutyrate (PBH) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PH…
The discovery of gold about 7000 years ago together with that of its sister metals from group IB of the periodic table can be said to have laid the early foundations of metallurgy as a science and a technology. The attraction of the metal to man derives from its relative scarcity and high value, its excellent corrosio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of the solubility of polar polymers by means of interfacial tension combining rulesC. J. Van Oss and R. J. GoodCite this: Langmuir 1992, 8, 12, 2877–2879Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 Dece…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics and photochemistry of 22.pi. and 26.pi. acetylene-cumulene porphyrinoidsDaniel O. Martire, Norbert Jux, Pedro F. Aramendia, R. Martin Negri, Johann Lex, Silvia E. Braslavsky, Kurt Schaffner, and Emanuel VogelCite this: J. Am. Chem. Soc. 1992, 114, 25, 9969–9978P…
A model for electron transport and emission in CsI is proposed. It is based on theoretically calculated microscopic cross sections for electron interaction with the nuclear and the electronic components of the solid. A Monte Carlo program based on this model was developed to simulate secondary electron emission induce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTerminal and segmental relaxations in epoxidized polyisopreneC. M. RolandCite this: Macromolecules 1992, 25, 25, 7031–7036Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https://pubs.acs.org/doi/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward a determination at near atomic resolution of two-dimensional crystal structures of amphiphilic molecules on the water surface: a study based on grazing incidence synchrotron x-ray diffraction and lattice energy calculationsFranck Leveiller, Didier Jacquemain, Leslie L…
Abstract Decomposition of complex X-ray diffraction profiles is used on well characterized (image analysis of transmission electron micrographs, X-ray fluorescence chemical analyses) diagenetic samples from the Paris basin. The simultaneous occurrence of three “illitic” phases (mixed-layer illite/smectite or I/S, poor…
Instrumental aspects of low-energy electron microscopy are reviewed with a view toward the future evolution of this reemergent technology. Both elastically scattered and inelastically excited electrons in the 0–1000-eV range may be used to form direct rather than scanned images of surfaces in the 3–10-nm resolution ra…
Nonresonant-type third-order nonlinearity of high refractive index PbO-TiO 2 -TeO 2 and Nb 2 O 5 -TiO 2 -TeO 2 glass has been evaluated by means of third-harmonic generation. The PbO-containing glass show higher χ (3) than Nb 2 O 5 -containing glass, and the largest χ (3) of 3.7×10 -12 esu is obtained for 10 mol%PbO-1…
The anaerobic ribonucleoside triphosphate reductase from Escherichia coli reduces CTP to dCTP in the presence of a second protein, named dA1, and a Chelex-treated boiled extract of the bacteria, named RT. The reaction requires S-adenosylmethionine, NADPH, dithiothreitol, ATP, and Mg2+ and K+ ions. It occurs only under…
Abstract Synthesis of the title compound (1), and its molecular structure determined by X-ray crystallographic analysis, and electrochemical property investigated by cyclic voltammetry are described. Several cation radical salts of 1 have been prepared by electrochemical oxidation method, and their electrical properti…
The relaxation behavior of a polymer blend, deutero-polystyrene and polyvinylmethylether (d-PS/PVME) was studied by investigating the equilibrium structure factor S(Q) and its time dependence S(Q,t) after the blend had been exposed to a rapid temperature step from T0 to Tf. The structure factor S(Q,t) was determined a…