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  • Springer  (89)
  • American Association for the Advancement of Science (AAAS)  (4)
  • 1995-1999  (93)
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  • 1
    Electronic Resource
    Electronic Resource
    Novel rhenium‐based catalysts for dehydrocondensation of methane with CO/CO2 towards ethylene and benzene (1999)
    Springer
    Catalysis letters 62 (1999), S. 29-33 
    Details
    ISSN: 1572-879X
    Keywords: methane ; dehydrocondensation ; benzene ; ethylene ; Re catalyst ; HZSM‐5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new family of rhenium‐based catalysts bearing HZSM‐5 zeolite exhibits remarkable performances for the catalytic dehydrocondensation of methane with CO/CO2 towards ethylene, benzene, and naphthalene in high selectivity of above 90% at 1–3 atm and 973–1023 K. In contrast to Mo/HZSM‐5 catalysts, the EXAFS and TG/DTA/Mass studies reveal that the metallic Re on HZSM‐5 zeolite is a catalytically active and stable phase for the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019022316715
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  • 2
    Electronic Resource
    Electronic Resource
    CO hydrogenation towards higher alcohols catalysed on SiO2-grafted and zeolite-entrapped Ru, Co and RuCo bimetallic clusters: Their EXAFS and FTIR characterization and catalytic performances (1995)
    Springer
    Topics in catalysis 2 (1995), S. 141-154 
    Details
    ISSN: 1572-9028
    Keywords: CO hydrogenation ; EXAFS characterization ; FTIR characterization ; Ru, RuCo and Co carbonyl clusters in NaY and NaX zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Some Ru and Co carbonyl clusters in zeolite pores such as Ru3(CO)12/NaY, [HRu6(CO)18]−/NaY, [Ru6(CO)18]2−/NaX, Co4(CO)12/NaY and Co6(CO)16/NaY were prepared by the ship-in-bottle technique, and characterized by FTIR and EXAFS. The RuCo bimetallic carbonyl cluster was prepared by reductive carbonylation of the oxidized RuCo/NaY, which provides the proposed assignment to [HRUCo3(CO)12]/NaY. The tailored Ru, RuCo and Co catalysts were prepared by H2 reduction from the precursors, e.g. Ru, RuCo bimetallic and Co carbonyl clusters impregnated on SiO2 and entrapped in NaY and NaX zeolites. The RuCo bimetallic carbonyl cluster-derived catalysts showed substantially higher activities and selectivities for oxygenates such as C1–C5 alcohols in CO hydrogenation (CO/H2 = 0.33-1.0, 5 bar, 519–543 K). By contrast, hydrocarbons such as methane were preferentially obtained on the catalysts prepared from Ru6, Ru3 and Co4 carbonyl clusters and provided lower CO conversion and poor selectivities for oxygenates. The RuCo bimetals are proposed to be associated with the selective formation of higher alcohols in CO hydrogenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01491962
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  • 3
    Electronic Resource
    Electronic Resource
    Fragment mass dependence of angular anisotropy in 15 MeV proton-induced fission of 244Pu (1998)
    Springer
    The European physical journal 2 (1998), S. 153-155 
    Details
    ISSN: 1434-601X
    Keywords: PACS:25.85.-w Fission reactions – 25.85.Ge Charged-particle-induced fission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Angular distributions of fission fragments with mass number A=97-159 have been measured by the radiochemical recoil-catcher method in the proton-induced fission of 244Pu with the incident energy of 15 MeV. Angular anisotropies of extreme asymmetric mass division products even up to the fragment mass ratio of A H /A L ∼ 1.85 are found not any different from those of the typical asymmetric mass division products with A∼ 138, which indicates that no clear evidence is observed for the existence of an additional saddle point configuration in the extreme asymmetric mass division. The correlation between the saddle point state evaluated from the angular anisotropy and the mass division mode is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050104
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of 4,4′-methylene-bis(2-chloroaniline)-DNA adducts in yeast expressing recombinant cytochrome P450s (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 564-568 
    Details
    ISSN: 1420-9071
    Keywords: 4,4′-Methylene-bis(2-chloroaniline) ; MBOCA-DNA adduct ; P450 2B5 ; P450 1A1 ; yeast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract N-Oxidation of 4,4′-methylene-bis(2-chloroaniline) (MBOCA) may lead to formation of DNA adducts. To determine if cytochrome P450s are involved in the formation of MBOCA derived-DNA adducts, yeast strains expressing rodent P450s were exposed to MBOCA, and32P-postlabelling of nucleotides from yeast genomic DNA was done. Chromatographic analysis on PEI cellulose showed that, upon exposure to MBOCA for 1 h, nine DNA adducts were formed in yeast expressing phenobarbital-inducible rabbit P450 2B5. With a 4-h-exposure, all adducts increased in parallel. In cell-free experiments, the incubation of MBOCA with phenobarbital-induced rat microsomal fraction followed by incubation with thymus DNA, led to the formation of more than ten DNA adducts. When yeast expressing 3-methylcholanthrene-inducible rat P450 1A1 was exposed to MBOCA, one major and two minor adducts were formed. No adducts were detected in control yeast. These results show that recombinant rabbit P450 2B5 exhibits a potential activation of MBOCA and that rat P450 1A1 has some effect. The use of yeast expressing recombinant P450s and the technique of32P-postlabelling facilitates a simple search for chemicals with carcinogenic potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02128744
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  • 5
    Electronic Resource
    Electronic Resource
    The Nehari problem for infinite-dimensional linear systems of parabolic type (1996)
    Springer
    Integral equations and operator theory 26 (1996), S. 29-45 
    Details
    ISSN: 1420-8989
    Keywords: 47B35 ; 93C25 ; 93B36
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A complete solution is obtained to the suboptimal Nehari extension problem for transfer functions of parabolic systems with Dirichlet boundary control and smooth observations. The solutions are given in terms of the realization (−A, B, C), whereA is a uniformly strongly elliptic operator of order two with smooth coefficients defined on a bounded open domain Ω ofR d ,B=AB D andB D is the Dirichlet map associated with Dirichlet boundary conditions andC is a bounded observation map fromL 2(Ω) to the output spaceY. The approach is to solve an equivalentJ-spectral factorization problem for this particular realization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229503
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  • 6
    Electronic Resource
    Electronic Resource
    Selectivity controlling in the hydrogenation of 1,3-butadiene on Tl-modified Pd catalyst (1995)
    Springer
    Catalysis letters 33 (1995), S. 341-348 
    Details
    ISSN: 1572-879X
    Keywords: Tl ; Pd ; bimetallic ; alloy ; intermetallic ; catalyst ; hydrogenation ; 1,3-butadiene ; selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The selectivity and reactivity in the hydrogenation of 1,3-butadiene catalyzed by Tl-modified 5 wt% Pd/Al2O3 catalysts vary with amounts of Tl loading and with the reduction temperatures, that is, the main product was 1-butene and trans-2-butene for values of Tl loading of 0.5 and 2 in Tl/Pd atomic ratio, respectively, when the catalysts were reduced at 673 K. 1,3-butadiene was hydrogenated selectively towards 1-butene and trans-2-butene when the Tl modified 5 wt% Pd/Al2O3 catalyst of Tl/Pd = 2 was reduced at 300 and 373 K or above, respectively. On the catalyst with Tl/Pd = 2 reduced at 373 K or above, the butenes formed are not hydrogenated to butane, even after a long reaction time. These results suggest the formation of Pd-Tl alloy or intermetallic compounds during the reduction procedure which is responsible for the selectivity controlling in the reaction. TPR and XRD results were in consistence with the reaction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814236
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  • 7
    Electronic Resource
    Electronic Resource
    Structural characterization of photoreduced complete and incomplete cubane-type molybdenum oxide clusters in CO and their catalytic behavior in propene metathesis reaction (1996)
    Springer
    Catalysis letters 38 (1996), S. 101-108 
    Details
    ISSN: 1572-879X
    Keywords: cubane-type molybdenum oxide clusters ; CO-photoreduction ; propene metathesis reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SiO2-impregnated complete and incomplete cubane-type molybdenum oxide clusters such as [(RhCp*)4Mo4O16] (I) and [(RhCp*)2Mo3O9(OMe)4] (II) were photoreduced with a UHP-Hg lamp (〉 365 nm) in CO, resulting in the formation of catalytically active species for propene metathesis at 300 K. The CO-photoreduced Mo oxide clusters were characterized by EXAFS, IR, XPS and TPD technique. The results suggest that the Mo-O4c (four-centered bridging oxygens) in I were specifically reduced with CO under the illumination to produce two sets of subcarbonyl species, e.g., those characteristic of the IR bands at 2061 and 2021 cm−1, which were thermally inactive for the13CO exchange reaction but very active under illumination at 300 K, possibly assignable to Mo(CO)x (x = 2, 3), whereas those at 2092 and 2035 cm−1 due to Rh(CO)2, which were readily exchangeable with13CO at 300 K in dark. Removal of both carbonyls attached on Rh and Mo in photoreduced I and II by evacuation at 375–440 K led to the formation of oxygen-deficient Mo4+/Mo5+ sites, which exhibited high catalytic activities in propene metathesis at 300 K to produce an equimolar mixture of ethene and 2-butenes. The CO-photoreduced incomplete cubane Mo oxide cluster (II) exhibited higher activities and higher trans/cis ratios of 2-butenes in the reaction, compared with those on the photoreduced I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806907
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  • 8
    Electronic Resource
    Electronic Resource
    Broadening of the effective temperature range for NO removal on Co·Pd-modified H-ZSM-5 catalyst by suppression of CH4 combustion (1998)
    Springer
    Catalysis letters 52 (1998), S. 145-149 
    Details
    ISSN: 1572-879X
    Keywords: Co·Pd-modified H-ZSM-5 ; two-stage catalyst packing ; thermal treatment ; CH4 combustion ; NO elimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Broadening the effective temperature range (window) of NO removal on Co·Pd-modified H-ZSM-5 (Co/Pd/H-ZSM-5) in the presence of methane under an excess-oxygen condition was tried under the concept that the lack of the amount of methane occurred by CH4 combustion at high temperature reduced NO conversion to N2. The activity for NO removal of the catalyst at high temperature was improved due to suppression of methane combustion by the thermal treatment of Pd in a H2-containing flow. Co/Pd/H-ZSM-5s with and without the thermal treatment of Pd showed different temperature windows for NO elimination. These different windows were then combined by a two-stage catalyst packing, in which Co/(Pd/H-ZSM-5)red. and Co/Pd/H-ZSM-5 were placed in series, resulting in the broadening of the window.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019040007918
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  • 9
    Electronic Resource
    Electronic Resource
    Sustained Osteoblast Nuclear Receptor Binding of Converted 1α,25-Dihydroxyvitamin D3 after Administration of 3H-1α-Hydroxyvitamin D3: A Combined Receptor Autoradiography and Radioassay Time Course Study with Comparison to 3H-1α,25-Dihydroxyvitamin D3 (1998)
    Springer
    Calcified tissue international 63 (1998), S. 391-395 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Vitamin D — Receptor binding — Osteoporosis — Therapy — Bone.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The present study was undertaken to clarify the receptor distribution and the pharmacokinetics of 3H-1α(OH)D3, and 3H-1α,25(OH)2D3 for comparison. Receptor autoradiography was used after intravenous injection to 3-day-old neonatal rats and radioassay-HPLC after oral application to young adult rats. Corresponding results were obtained from both receptor autoradiography and radioassay. After 3H-1α(OH)D3 administration, uptake was delayed but sustained over a long period of time and the concentration of silver grains (autoradiography) or recovered 3H-1α,25(OH)2D3 (radioassay) peaked at a lower level. After 3H-1α,25(OH)2D3 administration, osteoblast nuclear, whole bone uptake and retention of radiolabeled compound were relatively rapid and short in duration. Nuclear uptake in osteoblasts after administration of 3H-1α(OH)D3 was abolished in competition studies with 10-fold unlabeled 1α,25(OH)2D3. These results indicate that 1α(OH)D3 continuously supplies osteoblasts with converted 1α,25(OH)2D3 and would not spread to the cells because of the low binding affinity of the receptor. Accordingly, 1α(OH)D3 appears to have some therapeutic properties different from 1α,25(OH)2D3 because of a relatively slow and sustained accumulation of the receptor and less Cmax (pharmacokinetics) compared with 1α,25(OH)2D3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900546
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  • 10
    Electronic Resource
    Electronic Resource
    P-adic theta functions and solutions of the KP hierarchy (1996)
    Springer
    Communications in mathematical physics 176 (1996), S. 383-399 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Based on Schottky uniformization theory of Riemann surfaces, we construct a universal power series for (Riemann) theta function solutions of the KP hierarchy. Specializing this power series to the coordinates associated with Schottky groups overp-adic fields, we show that thep-adic theta functions of Mumford curves give solutions of the KP hierarchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02099554
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