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The cytotoxicity (in the dark), phototoxicity (red light) and subcellular localization (using confocal laser scanning microscopy) were determined for 15 porphyrins (1-15) in C6 glioma cells. The partition coefficient in 2-octanol was also determined for each porphyrin at pH 7.4. The cytotoxicity increased with pi (log…
Abstract Peroxo complexes prepared by the reaction of titanoundecatungstophosphate (PTiW11O405−) and dititanodecatungstophosphate (PTi2W10O407−) with hydrogen peroxide are characterized by means of the 183W NMR spectroscopy and the single crystal X-ray diffractometry. Electronic spectra and permanganate titration anal…
Domain switching of 90° ferroelectric domains in tetragonal BaTiO3 and PbTiO3 is induced by the application of stress along specific crystallographic axes. For BaTiO3, single-domain crystals are obtained from twinned specimens by the application of ∼1.1 MPa of stress parallel to the a axis and twin boundaries are indu…
Abstract Hydrotalcite pillared by polyoxometalates of Mo and W catalyzed epoxidation of alkenes with H2O2 with significant shape selectivity; epoxidation of 2-hexene was favored than that of cyclohexene. The subsequent hydrolysis of epoxides to form diols was retarded compared to hydrotalcite-free catalysts.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparations, x-ray crystal structures, EH band calculations, and physical properties of [(TTF)6(H)(XM12O40)(Et4N)] (M = tungsten, molybdenum; X = phosphorus, silicon): evidence of electron transfer between organic donors and polyoxometalatesL. Ouahab, M. Bencharif, A. Mhann…
Four ReO4 units each anchored to a silicon atom are found in the soluble metal-containing siloxane 1, accessible from the silanetriol tBuSi(OH)3 and Re2O7. The silanetriol does not undergo condensation reactions and can be prepared from tBuSiCl3 by hydrolysis in high yield. Compounds like 1 are interesting as model co…
In ordered L${1}_{2}$-type ${\mathit{A}}_{3}$B compounds, each A atom is coordinated by 8A+4B atoms, while each B atom is coordinated by 12A atoms. By symmetry, all A-A, A-B, and B-B bond lengths are equal. When this structure disorders to form the substitutionally random ${\mathit{A}}_{0.75}$${\mathit{B}}_{0.25}$ all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic viscosity of model Starburst dendrimersMarc L. Mansfield and L. I. KlushinCite this: J. Phys. Chem. 1992, 96, 10, 3994–3998Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1021…
Proteins of the phosphoenolpyruvate:sugar phosphotransferase system (PTS) of Bacillus subtilis were overexpressed, purified to near homogeneity, and characterized. The proteins isolated include Enzyme I, HPr, the glucose-specific IIA domain of the glucose-specific Enzyme II (IIAglc), and the mannitol-specific IIA prot…
The N-terminal domain of human immunodeficiency virus (HIV-1) integrase (IN) contains the sequence motif His-Xaa3-His-Xaa23-Cys-Xaa2-Cys, which is strongly conserved in all retroviral and retrotransposon IN proteins. This structural motif constitutes a putative zinc finger in which a metal ion may be coordinately boun…
It was earlier shown theoretically that the radioactivity released by spent-fuel elements into storage pool water is predominantly carried by positive ions. A new decontamination method is described in which freshly contaminated metallic surfaces are decontaminated electrochemically, resulting in smooth, shiny surface…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of 24-Methylenecycloartanol from Cycloartenol Via a Chemical MethodShoei-Sheng Lee, Liang-Hwa Young, and K. C. WangCite this: J. Nat. Prod. 1992, 55, 5, 644–648Publication Date (Print):May 1, 1992Publication History Published online1 July 2004Published inissue 1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleComplex viscosity for the rigorous formulation of the multibead internal viscosity model with hydrodynamic interactionT. P. Dasbach, C. W. Manke, and M. C. WilliamsCite this: J. Phys. Chem. 1992, 96, 10, 4118–4125Publication Date (Print):May 1, 1992Publication History Published…
The significance of the finishing process for the preparation of flock fibres is discussed. The performance of nylon 6.6 flock fibres at different stages in the manufacture of flocked fabrics has been examined in the laboratory after the application of various finishing treatments to the fibres. The results demonstrat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and dynamics of starch crosslinked with urea-formaldehyde polymers by carbon-13 CP/MAS NMR spectroscopyParshuram G. Shukla, Swaminathan Sivaram, and Baijayantimala MohantyCite this: Macromolecules 1992, 25, 10, 2746–2751Publication Date (Print):May 1, 1992Publicati…
NutraSweet sludge, a by‐product from the manufacture of the artificial sweetner aspartame, is often applied to land as fertilizer. In many cases, the sludge is surface‐applied, which could result in gaseous losses of nitrogen. In order to determine the relative importance of nitrogen losses through ammonia volatilizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical vapor deposition precursor chemistry. 3. Formation and characterization of crystalline nickel boride thin films from the cluster-assisted deposition of polyhedral borane compoundsShreyas S. Kher and James T. SpencerCite this: Chem. Mater. 1992, 4, 3, 538–544Publicat…
We have used photothermal-beam-deflection spectroscopy to measure the change in the index of refraction of ${\mathrm{Ti}}^{3+}$-doped sapphire after pulsed excitation at 532 nm with a neodymium-doped yttrium aluminum garnet laser. The beam-deflection signal arises from both thermal and nonthermal sources. The nontherm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly[bis(phosphazo)phosphazenes] bearing aryloxy and alkoxy side groupsHarry R. Allcock and Dennis C. NgoCite this: Macromolecules 1992, 25, 11, 2802–2810Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConversion of chlorofluorocarbons into chlorofluorohydrocarbons using the Atherton-Todd reaction with dimethyl phosphonateEmil Georgiev, D. Max Roundhill, and Koljo TroevCite this: Inorg. Chem. 1992, 31, 10, 1965–1968Publication Date (Print):May 1, 1992Publication History Pu…