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  • 1
    Electronic Resource
    Electronic Resource
    Fourier transform ion cyclotron resonance studies of H2 chemisorption on niobium cluster cations (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5215-5224 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reaction rates and saturation values were determined for H2 dissociative chemisorption on positive niobium cluster ions in an FT-ICR apparatus. Clusters with 8,10,12, and 16 atoms were found to be particularly unreactive, in remarkable agreement with the reactivity patterns observed previously for neutral niobium clusters. Saturation coverage for most clusters was found to occur near a hydrogen/niobium ratio of 1.3, although some clusters (8–12,16, and 19) reached effectively inert compositions at considerably lower coverages. Several examples were found of clusters having two isomeric forms with different reactivities. One form of Nb+19 was found to readily react with H2, whereas a second form representing one-third of the original sample of 19 atom clusters was completely inert to H2 chemisorption under the same FT-ICR conditions. The geometrical shape of these niobium clusters must therefore have a critical effect on reactivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454596
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dissociative chemisorption of molecular hydrogen on niobium cluster ions. A supersonic cluster beam FT-ICR experiment (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 4480-4482 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100410a004
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    FT-ICR probes of silicon cluster chemistry: The special behavior of Si+39 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2397-2399 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: FT-ICR techniques were used to probe the surface chemistry of isolated silicon cluster ions in the 7–65 atom size range. Dissociative chemisorption reactions with NH3 were observed to proceed with rates which varied widely with cluster size. One particular cluster, Si+39, was found to be remarkably inert. Clusters with 20, 25, 33, and 45 atoms were found to be unreactive as well, while those with 18, 23, 30, 36, 43, or 46 atoms were quite reactive. Similarly oscillating reaction patterns were observed with CH3OH, whereas highly reactive free radical scavengers such as O2 and NO showed little selectivity. These results suggest the silicon clusters in this size range have well-defined structures which vary in ability to catalyze dissociative chemisorption at the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453123
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photophysics of metal complexes of spheroidal carbon shells (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 4464-4465 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00221a085
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    CCK-8 injected into the nucleus accumbens attenuates the supersensitive locomotor response to apomorphine in 6-OHDA and chronic-neuroleptic treated rats (1989)
    Springer
    Psychopharmacology 99 (1989), S. 409-415 
    Details
    ISSN: 1432-2072
    Keywords: Apomorphine ; Cis-[Z]-flupenthixol ; Dopamine ; Supersensitivity ; 6-Hydroxydopamine ; Cholecystokinin ; Haloperidol ; Nucleus accumbens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Postsynaptic dopamine-cholecystokinin (CCK) interactions in the nucleus accumbens were studied in two behavioral preparations of DA receptor supersensitivity: chronic-neuroleptic treated and 6-hydroxydopamine (6-OHDA) denervated rats. Subcutaneous (SC) injections of apomorphine (APO; 0.15 mg/kg) in experiment 1 produced marked hyperlocomotion in rats following 12 days of pretreatment with cis-[Z]-flupenthixol (2 mg/kg; twice per day). Bilateral intra-accumbens (N.Acc.) microinjections of CCK-8 (2 ng and 2 μg) reliably reduced APO-stimulated hyperlocomotion. An intermediate CCK dose (20 ng) was without effect. No change in APO responsivity following chronic vehicle treatment was observed and the baseline APO response was not altered by CCK at any dose. Denervation of mesolimbic dopamine (DA) terminals by intra-N.Acc. injections of 6-hydroxydopamine (6-OHDA; 8 μg/side) in experiment 2 similarly resulted in intense locomotor hyperactivity after APO stimulation (0.1 mg/kg; SC). Bilateral intra-N.Acc. injections of CCK-8 (1, 10, 100 ng, and 1 μg) significantly attenuated the supersensitive locomotor response to APO. As in experiment 1, CCK produced “biphasic” dose-response effects with strong attenuation that persisted throughout the entire 60-min test at both high (1 μg) and low (1 ng) doses. Intermediate CCK doses (10 and 100 ng) produced only shortterm reductions in activity. Hypomotility induced by APO in SHAM-lesioned rats was not effectively reversed by CCK treatments. CCK had no effect on unstimulated baseline locomotor activity in either 6-OHDA or SHAM-lesioned rats. These results provide further evidence that CCK-8 modulates mesolimbic DA activity by functionally opposing the postsynaptic effects of DA in the region of the nucleus accumbens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00445568
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  • 6
    Electronic Resource
    Electronic Resource
    Mössbauer investigation of iron doped YBa2Cu3O7−σ (1989)
    Springer
    Hyperfine interactions 50 (1989), S. 537-540 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently, we have shown that in YBa2Cu3O7−σ, Fe substitutes Cu(1) in different oxygen configurations. This result has been obtained using uniaxially oriented poweder. In this paper, we discuss these results in connexion with new measurements. Finally we compare the effect of different metallic impurities on the physical properties of these superconducting oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407688
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