The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
B Samiey - One of the best experts on this subject based on the ideXlab platform.
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speeds of sound and isentropic compressibilities of binary mixtures of 1 heptanol 1 2 dichloroethane 1 1 1 trichloroethane 1 1 2 2 tetrachloroethane triChloroethylene and tetraChloroethylene at 303 15 k comparison with theories
Physics and Chemistry of Liquids, 2007Co-Authors: H Iloukhani, B SamieyAbstract:Densities ρ, and speeds of sound u, of the binary mixtures of 1-heptanol with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, triChloroethylene, and tetraChloroethylene have been measured over the complete composition range at 303.15 K. Isentropic compressibility κs, and Isentropic compressibility deviations Δκs were calculated, and were correlated by a Redlich–Kister type function to determine the fitting parameters and the SDs. The results are consistent with the self-association of 1-heptanol and the polar and nonpolar characters of used chloroethanes or Chloroethylenes, which produce the dissociation of 1-heptanol. Speeds of sound and isentropic compressibilities have been compared with calculated values from Jacobson free length theory, Schaaff collision factor theory, Nomoto relation, Junjie relation and Van Deal ideal mixing relation.
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studies of viscosities and excess molar volumes of the binary mixtures of 1 heptanol 1 2 dichloroethane 1 1 1 trichloroethane 1 1 2 2 tetrachloroethane triChloroethylene and tetraChloroethylene at 293 15 298 15 and 303 15 k for the liquid region and
Journal of Chemical & Engineering Data, 2005Co-Authors: H Iloukhani, B SamieyAbstract:Densities (ρ) and viscosities (η) of the binary mixtures of 1-heptanol with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, triChloroethylene, and tetraChloroethylene have been measured at (293.15, 298.15, and 303.15) K for the liquid region and at ambient pressure for the whole composition range. Excess molar volumes (V E), excess thermal expansivities (αE), and viscosity deviations (δη) were calculated and correlated by Redlich−Kister type function to determine the fitting parameters and the standard deviations. The results are consistent with the self-association of 1-heptanol and the polar and nonpolar characters of used chloroethanes or Chloroethylenes, which produce the dissociation of 1-heptanol. The two-parameter Heric interaction model has also been used to correlate the kinematic viscosities of binary liquid mixtures with mole fractions.
H Iloukhani - One of the best experts on this subject based on the ideXlab platform.
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speeds of sound and isentropic compressibilities of binary mixtures of 1 heptanol 1 2 dichloroethane 1 1 1 trichloroethane 1 1 2 2 tetrachloroethane triChloroethylene and tetraChloroethylene at 303 15 k comparison with theories
Physics and Chemistry of Liquids, 2007Co-Authors: H Iloukhani, B SamieyAbstract:Densities ρ, and speeds of sound u, of the binary mixtures of 1-heptanol with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, triChloroethylene, and tetraChloroethylene have been measured over the complete composition range at 303.15 K. Isentropic compressibility κs, and Isentropic compressibility deviations Δκs were calculated, and were correlated by a Redlich–Kister type function to determine the fitting parameters and the SDs. The results are consistent with the self-association of 1-heptanol and the polar and nonpolar characters of used chloroethanes or Chloroethylenes, which produce the dissociation of 1-heptanol. Speeds of sound and isentropic compressibilities have been compared with calculated values from Jacobson free length theory, Schaaff collision factor theory, Nomoto relation, Junjie relation and Van Deal ideal mixing relation.
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studies of viscosities and excess molar volumes of the binary mixtures of 1 heptanol 1 2 dichloroethane 1 1 1 trichloroethane 1 1 2 2 tetrachloroethane triChloroethylene and tetraChloroethylene at 293 15 298 15 and 303 15 k for the liquid region and
Journal of Chemical & Engineering Data, 2005Co-Authors: H Iloukhani, B SamieyAbstract:Densities (ρ) and viscosities (η) of the binary mixtures of 1-heptanol with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, triChloroethylene, and tetraChloroethylene have been measured at (293.15, 298.15, and 303.15) K for the liquid region and at ambient pressure for the whole composition range. Excess molar volumes (V E), excess thermal expansivities (αE), and viscosity deviations (δη) were calculated and correlated by Redlich−Kister type function to determine the fitting parameters and the standard deviations. The results are consistent with the self-association of 1-heptanol and the polar and nonpolar characters of used chloroethanes or Chloroethylenes, which produce the dissociation of 1-heptanol. The two-parameter Heric interaction model has also been used to correlate the kinematic viscosities of binary liquid mixtures with mole fractions.
Bekir Cetinkaya - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and catalytic application of secondary carbene palladium ii complexes obtained by oxidative addition reaction
Inorganica Chimica Acta, 2012Co-Authors: Suleyman Gulcemal, Salih Gunnaz, Jeanclaude Daran, Bekir CetinkayaAbstract:Abstract Three new secondary carbene palladium(II) complexes (1b–3b) were synthesized via oxidative insertion of Pd2(dba)3 (dba = dibenzylideneacetone) into the C–Cl bond of dialkyl(chloromethylene)ammonium chloride salts ([R2NCHCl]+Cl−). All complexes have been characterized by 1H, 13C, and 31P NMR analysis. X-ray diffraction studies on single crystal of 3b confirm the cis square planar geometry. Complexes (1b–3b) have been proved to be efficient catalysts in the Heck coupling of styrene with 4-bromoacetophenone.
Suleyman Gulcemal - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and catalytic application of secondary carbene palladium ii complexes obtained by oxidative addition reaction
Inorganica Chimica Acta, 2012Co-Authors: Suleyman Gulcemal, Salih Gunnaz, Jeanclaude Daran, Bekir CetinkayaAbstract:Abstract Three new secondary carbene palladium(II) complexes (1b–3b) were synthesized via oxidative insertion of Pd2(dba)3 (dba = dibenzylideneacetone) into the C–Cl bond of dialkyl(chloromethylene)ammonium chloride salts ([R2NCHCl]+Cl−). All complexes have been characterized by 1H, 13C, and 31P NMR analysis. X-ray diffraction studies on single crystal of 3b confirm the cis square planar geometry. Complexes (1b–3b) have been proved to be efficient catalysts in the Heck coupling of styrene with 4-bromoacetophenone.
James A Swenberg - One of the best experts on this subject based on the ideXlab platform.
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detection of 1 n6 ethenoadenine in rat urine after Chloroethylene oxide exposure
Carcinogenesis, 1998Co-Authors: Sharon Holt, Tenyang Yen, R Sangaiah, James A SwenbergAbstract:The four etheno adducts of vinyl chloride formed in DNA, 1,N6-ethenoadenine (epsilonA), 3,N4-ethenocytosine, 1,N2-ethenoguanine and N2,3-ethenoguanine were previously reported to be released from DNA by a family of enzymes in the base-excision repair pathway (Dosanjh et al., Proc. Natl Acad. Sci. USA, 91, 1024-1028, 1994; Hang et al., Carcinogenesis, 17, 155-157, 1996; Hang et al., Proc. Natl Acad. Sci. USA, 94, 12869-12874, 1997). Adducts excised from DNA by glycosylases are usually excreted in urine and have been reported to be potential biomarkers of DNA damage in exposed individuals. In this study, we report the detection of epsilonA in the urine of rats exposed to Chloroethylene oxide (CEO) using immunoaffinity columns made with specific monoclonal antibodies for enrichment, followed by quantitation by HPLC with fluorescence detection. Chemical analysis of urine samples revealed the presence of a compound chromatographically identical to authentic epsilonA standard. This compound was confirmed by mass spectral analysis. EpsilonA was present in urine of control and CEO-treated rats, with the latter having up to 50-fold greater amounts. The cumulative excretion of epsilonA reached a plateau between 24 and 48 h post-exposure. While it is clear that CEO treatment results in increased excretion of epsilonA, the exact source of the adduct is unknown. When rats were administered epsilonA i.v., approximately 10% of the administered dose was excreted in urine. This research demonstrates that urinary excretion of epsilonA may be a potential biomarker for in vivo alkylation of DNA and nucleotide pools.
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mutagenicity of vinyl chloride and its reactive metabolites Chloroethylene oxide and chloroacetaldehyde in a metabolically competent human b lymphoblastoid line
Carcinogenesis, 1997Co-Authors: Suyin Chiang, James A Swenberg, Wade H Weisman, Thomas R SkopekAbstract:Vinyl chloride (VC), a known human and rodent carcinogen, is metabolically activated by cytochrome P450 to Chloroethylene oxide (CEO), which can rearrange to chloroacetaldehyde (CAA) or undergo hydrolysis. To further understand the roles of CEO and CAA in VC mutagenesis, the types and frequencies of mutations induced at the hypoxanthine (guanine) phosphoribosyl-transferase (hprt) locus were examined in a human B-lymphoblastoid line constitutively expressing human cytochrome P450 2E1 (H2E1 cells). VC was toxic and mutagenic to H2E1 cells as a function of incubation time; exposure to 7.5% VC in air resulted in 75% survival and an hprt mutant frequency of 42 x 10(-6) after 48 h, compared to 5.7 +/- 2.7 x 10(-6) for unexposed cells. The exposure of H2E1 cells to 0.8 to 15.0% VC in air produced similar mutant frequencies without a clear dose-response relationship, suggesting saturation of metabolic activation. Both CEO and CAA exhibited dose-dependent increases in cell killing and mutant frequency in H2E1 cells. Treatment with 16 microM CEO for 24 h resulted in 75% survival and an induced mutant frequency of 23 x 10(-6), while 16 microM CAA produced 5% survival and an induced mutant frequency of 20 x 10(-6). Structural alterations at the hprt locus in independent thioguanine-resistant clones were examined by Southern blot analysis of Pst I-digested DNA with a full-length human hprt cDNA probe. Ten percent (5/50) of VC-induced and 18% (7/38) of CEO-induced mutants showed detectable deletions, compared with 45% (9/20) of CAA-induced mutants. Thus, VC and CEO displayed similar toxicity/mutation profiles and a similar frequency of large deletions, whereas CAA displayed greater toxicity and a larger frequency of deletion mutations. These results suggest that the majority of mutations induced by VC occur through its metabolite, CEO.