Now showing items 111-120 of 152
Effect of interfacial variables on metal-porcelain bonding
(John Wiley & Sons, Inc., 1993-04)
While ceramic-to-metal bonding has been used in many applications, the actual chemical and physical factors leading to optimum bond strength are not well understood. In this work, several variables affecting the bonding ...
ortho-Substituent effects on the in vitro and in vivo genotoxicity of benzidine derivatives
(Elsevier, 1993-09)
Benzidine and its 3,3'-diamino, 3,3'-dimethyl, 3,3'-dimethoxy, 3,3'-difluoro, 3,3'-dichloro, 3,3'-dibromo, 3,3'-dicarbomethoxy and 3,3'-dinitro derivatives together with 2-nitrobenzidine and 3-nitrobenzidine were compared ...
Conformational studies of hairpin sequences from the ColE1 cruciform
(Elsevier, 1993)
Inverted repeat sequences derived from the ColE1 cruciform were investigated by nuclear magnetic resonance (NMR) and UV spectroscopy. It was shown that 15 different sequences exist as stable hairpin structures over a range ...
Multicenter phase II study of brequinar sodium in patients with advanced gastrointestinal cancer
(Kluwer Academic Publishers; Springer Science+Business Media, 1993-02)
Eighty-six patients with advanced colorectal, gastric or pancreatic carcinoma and no prior exposure to chemotherapy were treated with brequinar sodium. Brequinar was administered at a median weekly dose of 1200 mg/m 2 ...
The genotoxicity of enantiomeric aliphatic epoxides
(Elsevier, 1993-01)
The (R)- and (S)-optical isomers of 9 epoxides, benzyloxymethyloxirane, epichlorohydrin, glycidol, glycidyl 3-nitrobenzenesulfonate, glycidyl 4-nitrobenzoate, glycidyl tosylate, styrene oxide, glycidyl 1-naphthyl ether and ...
Systematic approach to the development of plasma amino acid analysis by high-performance liquid chromatography with ultraviolet detection with precolumn derivatization using phenyl isothiocyanate
(Elsevier, 1993-11-17)
A reversed-phase liquid chromatographic method for the separation of 26 phenylthiocarbamyl derivatives of amino acids in human plasma in ca. 35 min. is described. The method used a C18 column (150 x 4.6 mm I.D., 3 [mu]m) ...
Multicenter phase II study of brequinar sodium in patients with advanced lung cancer
(Springer-Verlag, 1993-01)
A total of 53 patients with advanced lung cancer [non-small-cell (NSC), 21; small-cell (SC), 32] were treated with brequinar sodium. All of the NSC patients were chemotherapy-naive, but 31/32 (97%) SC patients had failed ...
Studies of Fluorine in Catalysts with Ultrasoft X-Ray Absorption Spectroscopy
(Elsevier, 1993-08)
The structures of fluorine-doped alumina catalyst powders have been studied by fluorescence yield ultrasoft X-ray absorption spectroscopy. The results presented here demonstrate that important local structural information ...
Hydrogen Peroxide-Dependent Formation and Bleaching of the Higher Oxidation States of Bovine Erythrocyte Green Hemeprotein
(Elsevier, 1993-02-15)
The ferric and ferrous forms of bovine erythrocyte green hemeprotein react with hydroperoxides to form higher oxidation state intermediates with absorbance maxima in the Soret region at 426 and 422 nm, respectively. In the ...
Normal coordinate analysis of bilirubin vibrational spectra: Effects of intramolecular hydrogen bonding
(Elsevier, 1993-11)
Normal coordinate analyses are presented for half-bilirubin molecules. Calculations for the A---B pyrromethenone include intramolecular hydrogen bonds, while those for the C---D chromophore exclude intramolecular hydrogen ...