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Abstract Clay samples of greenish colour were collected from submarine hydrothermal chimneys of the Galapagos Rift and Mariana Trough. Mineralogical and chemical investigations of the clay by scanning and transmission electron microscopy, X-ray diffraction, differential thermal analysis, infrared-spectros-copy, X-ray…
The theory for the coupled perturbed Kohn–Sham calculation of hyperpolarizabilities using nonlocal density functionals is presented. Results for calculations on formaldehyde, acetonitrile, and methyl fluoride using moderate size basis sets are reported. These results are compared with previous density functional calcu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Molecular Structure on the Thermodynamics of Block Copolymer MeltsC. C. Lin, S. V. Jonnalagadda, P. K. Kesani, H. J. Dai, and N. P. BalsaraCite this: Macromolecules 1994, 27, 26, 7769–7780Publication Date (Print):December 1, 1994Publication History Published online…
Natural pyrochlore and zirconolite undergo a crystalline-aperiodic transformation caused by alpha-decay of 232Th and 2380 at dose levels between 2 X 1014 and 3 X 1017 a/mg. The principal effects of the transformation are volume expansion and microfracturing, providing potential pathways for fluids. Geochemical alterat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin Conversion versus Antiferromagnetic Interaction in Iron(II) Trinuclear Species. Crystal Structures and Magnetic Properties of [Fe3(p-MeOptrz)8(H2O)4](BF4)6 and [Fe3(p-MeOprtz)6(H2O)6](tos)6 [p-MeOptrz = 4-(p-Methoxyphenyl)-1,2,4-triazole, tos = tosylate]Martina Thomann,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization Kinetics of Block Copolymers in Selective SolventChikako Honda, Yuki Hasegawa, Rieko Hirunuma, and Takuhei NoseCite this: Macromolecules 1994, 27, 26, 7660–7668Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inis…
Results from a high resolution calorimetric study for the alkylcyanobiphenyl liquid crystal series nCB, with n the number of carbons in the alkyl chain, confined to the 0.2 \ensuremath{\mu}m diam cylindrical pores of Anopore membranes are reported. The orientational order at the pore wall is controlled and varied from…
Summary Soil solution was obtained from potted rhizosphere or non‐rhizosphere soils by water displacement or soil centrifugation. The pH of the displaced solutions was lower than that of bulk soils when solutions were obtained from non‐rhizosphere soil, although it increased as plants grew. This increase probably refl…
Studies investigating the erosion mechanism of the newly developed poly (fatty acid dimer: sebacic acid) polyanhydride (p:[FAD:SA]) are described. The overall erosion of different monomer compositions of p(FAD:SA) copolymers was examined to determine whether and to what extent copolymer properties affected polymer ero…
Impedance spectra of carbon steel in the presence of 1‐hydroxy‐ethane‐1,1‐diphosphonic acid (HEDP) has been investigated in neutral solutions. The aim of the measurements was to study the effect of HEDP on the carbon steel corrosion as a function of inhibitor concentration. An optimal inhibitor concentration was found…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous Double Cyclization Reactions of .beta.-FormylporphyrinsLaurent Barloy, David Dolphin, Daniel Dupre, and Tilak P. WijesekeraCite this: J. Org. Chem. 1994, 59, 26, 7976–7985Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular Chemistry. 49. Ligand-Porphyrin Complexes: Quantitative Evaluation of Stacking and Ionic ContributionsHans-Joerg Schneider and Manxue WangCite this: J. Org. Chem. 1994, 59, 24, 7464–7472Publication Date (Print):December 1, 1994Publication History Published onl…
The sequence of a 2,437-bp DNA segment from the naphthalene upper catabolic pathway operon of plasmid NAH7 was determined. This segment contains three large open reading frames designated nahQ', nahE, and nahD. The first of these is the 3' end of an open reading frame that has no known function, the second (993 bp) en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpatial Distribution of Homopolymers in Block Copolymer Microdomains As Observed by a Combined SANS and SAXS MethodSatoshi Koizumi, Hirokazu Hasegawa, and Takeji HashimotoCite this: Macromolecules 1994, 27, 26, 7893–7906Publication Date (Print):December 1, 1994Publication Hi…
Abstract The oxidation kinetics of NO by O 2 in aqueous solution was observed using a stopped flow apparatus. The kinetics follows a third order rate law of the form k · [NO] 2 · [O 2 ] in analogy to gas‐phase results. The rate constant at 296 K was measured as (6.4 ± 0.8) · 10 6 M −2 s −1 with an activation energy of…
High-temperature oxide melt solution calorimetry with molten 2PbO{center_dot} B{sub 2}O{sub 3} as a solvent can be used for determining enthalpies of formation of carbonates and hydrous silicates. Under conditions of gas flow at 1-2 cm{sup 3}/s, all H{sub 2}O and CO{sub 2} is expelled from the solvent, leading to a re…
The heat-stable inhibitor of cAMP-dependent protein kinase (PKI) was shown previously to export the kinase catalytic subunit (C) from the nucleus (Fantozzi, D. A., Harootunian, A. T., Wen, W., Taylor, S. S., Feramisco, J.R., Tsien, R. Y., and Meinkoth, J. L. (1994) J. Biol. Chem. 269, 2676-2686), in addition to its ab…
Fluid–fluid phase separation in a simple model for a colloid dispersed in a solution of stiff rodlike polymers is studied by means of Gibbs ensemble Monte Carlo simulations. The fluid–solid transition for this model is computed using first-order perturbation theory. The phase diagrams clearly show that a stable critic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA well-defined surface-confinable fullerene: monolayer self-assembly on Au(111)Xiaobo Shi, W. Brett Caldwell, Kaimin Chen, and Chad A. MirkinCite this: J. Am. Chem. Soc. 1994, 116, 25, 11598–11599Publication Date (Print):December 1, 1994Publication History Published online1…
Temperature programmed static secondary ion mass spectrometry (TPSSIMS) and temperature programmed desorption (TPD) have been used to study the kinetics of adsorption, dissociation, and desorption of NO on Rh(111). At 100 K, NO adsorption is molecular and proceeds via mobile precursor state kinetics with a high initia…