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  • 1
    Electronic Resource
    Electronic Resource
    Organic residues introduced during metal oxide functionalization (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 758-761 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00237a021
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  • 2
    Electronic Resource
    Electronic Resource
    Amphiphilic diacetylenes with pyridine and 2,2′-bipyridine headgroups — polymerization properties in the crystalline state, in LB-multilayers, and in complexes with transition metal salts. Morphology of polymerized multilayers (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 576-586 
    Details
    ISSN: 1435-1536
    Keywords: Solid state polymerization ; diacetylene derivatives ; monomolecular layers ; Langmuir-Blodgett multilayers ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Synthesis, amphiphilic properties and polymerization behaviour of a variety of single and double chain esters of pyridine- and 2,2′-bipyridine-carboxylic acids containing the diacetylene moiety are described. Conversion versus60Co-γ-ray dose curves indicate significant differences in solid-state reactivity of the individual compounds. The esters of isonicotinic acid form polymers that are soluble in chloroform. The monomers can be converted into salt derivatives and transition metal complexes, some of which are characterized concerning their solid state reactivity. Esters of isonicotinic acid form stable monolayers if spread onto neutral or acidified aqueous subphases at temperatures ≤ 15 °C. These monolayers can be deposited on substrates by the Langmuir-Blodgett technique and subsequently be UV-polymerized. In addition, attempts are reported to form polymeric mono- and multilayers by spreading the soluble polymeric amphiphiles at the air-water interface and subsequently transferring the films onto substrates. The two types of polymeric films exhibit morphologies that are significantly different. Polarizing micrographs indicate a domain structure of randomly shaped crystallites of only a few micrometers in diameter for LB-monolayers built up as monomers and polymerized on the substrate. On the other hand, polymer films built up as polymers are inhomogeneous and do not actually represent monomolecular films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421891
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  • 3
    Electronic Resource
    Electronic Resource
    Prostaglandin-Interaktion in der menschlichen Leber (1989)
    Springer
    Journal of molecular medicine 67 (1989), S. 1229-1235 
    Details
    ISSN: 1432-1440
    Keywords: PGE1, PGE2, PGI2, Iloprost ; cAMP ; Normal liver ; Hepatocellular cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The binding of prostaglandin (PG) E1 and Iloprost, a chemically stable PGI2-analogue, to purified plasma cell membranes (LPZM) from liver tissue samples obtained at surgery revealed heterogeneity of the binding sites identifying high and low affinity subpopulations. In contrast to these findings only high affinity binding sites were characterized for PGE2. Displacement studies exhibited the highest competition for the PGE1-sites by PGE1 and subsequently by PGE2, Iloprost, PGD2 and PGF2 α. The binding of PGE2 to the hepatic receptor could be best displaced by PGE2 and subsequently by PGE1 and Iloprost, PGD2 and PGF2 α. In addition, PGE1, PGE2 and Iloprost enhanced cAMP-production dose-dependently over baseline. Clinical studies revealed a remarkably lower binding capacity for PGE1 in hepatocellular cancer tissue than in noral liver parenchyma. The different binding behaviour of PGE1 (Iloprost) and PGE2 for the first time provides evidence that PGE1 and PGI2 like at platelet membranes occupate the same receptor also at human LPZM. Since a reasonable number of binding sites for these substances and an enhanced cAMP-production were shown in the liver, the study indicates a regulatory role of PGs in hepatic function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01745294
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  • 4
    Electronic Resource
    Electronic Resource
    Two endogenous neuropeptides (SCPA and SCPB) produce a cAMP-mediated stimulation of cardiac activity inAplysia (1985)
    Springer
    Journal of comparative physiology 156 (1985), S. 659-667 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Two endogenous neuropeptides (SCPA and SCPB) have recently been isolated fromAplysia tissue and sequenced (Fig. 1). 2. In the present study, we show that the SCPs excite isolatedAplysia hearts with a threshold below 10−11 M (Figs. 2, 4). The SCPs increase both the beat amplitude and heart rate in a manner similar to serotonin (Fig. 3), although the peptides are at least 10-fold more potent. The actions of the SCPs appear to be quite specific as several peptides with sequences moderately similar to the SCPs were completely inactive on the isolatedAplysia heart (Fig. 1). 3. The effects of serotonin on the heart appear to be mediated by an increase in cAMP levels primarily in the AV-valves (Mandelbaum et al. 1979). Long term incubation (5 min) with SCPB produces moderate increases in cAMP levels in the auricle and ventricle but not in the AV-valve (Table 1). We therefore determined if the contractile activity of the AV-valve was enhanced by SCPB. 4. SCPB increased the rate and amplitude of the contractions of an isolated spontaneously beating AV-valve in a manner similar to serotonin except that the responses to SCPB desensitized rapidly (within 2 min; Fig. 5). 5. cAMP determinations from AV-valves with shorter exposures to SCPB revealed very large increases (∼ 100-fold) with short exposures (15 s) that rapidly decreased to near control levels with longer exposures (within 2 min; Fig. 6). Thus, the effects of SCPB on cAMP levels and on the rate and amplitude of the AV-valve contractions showed similar kinetics. The effects of SCPB on cAMP levels in the ventricle were also time-dependent but much less so than for the valve (Fig. 6). 6. These data support the proposal that excitation of theAplysia heart is mediated by increased cAMP levels. To further test this proposal, we exposed the isolated AV-valve to the adenylate cyclase activator, forskolin. 10−5 M forskolin produced an increase in the rate and amplitude of valve contractions similar to that produced by serotonin or SCPB (Fig. 7). The response to forskolin did not desensitize. 7. Using a sensitive HPLC-bioassay procedure, neither SCPA nor SCPB were detected in the auricle, AV-valve, or ventricle. Furthermore, neither peptide could be detected in the blood using a procedure with a maximum sensitivity of 10−11 M. These findings suggest either that the SCPs regulate the heart at blood concentrations below 10−11 M, or that the heart is regulated by some other substance that is similar to the SCPs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619115
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: Phonon transmission at a liquid helium-solid interface: The influence of surface roughness and finite lifetimes of the He states (1988)
    Springer
    Journal of low temperature physics 70 (1988), S. 569-569 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682166
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  • 6
    Electronic Resource
    Electronic Resource
    Phonon transmission at a liquid helium-solid interface: The influence of surface roughness and finite lifetimes of the He states (1987)
    Springer
    Journal of low temperature physics 67 (1987), S. 27-46 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a one-dimensional quantum mechanical model the phonon transmission between a solid and liquid He is calculated. It is shown how surface roughness changes the binding forces between the He atoms and the solid and therefore can lead to an increased transmission of low-energy phonons. In addition it turns out that the finite lifetimes of the He states also enhance the transmission probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01070648
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  • 7
    Electronic Resource
    Electronic Resource
    The structure of small penta-twinned gold particles (1989)
    Springer
    The European physical journal 12 (1989), S. 119-121 
    Details
    ISSN: 1434-6079
    Keywords: 61.14 ; 81.15.L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structural feathers of penta-twinned gold particles (size between 2 and 6 nm) generated by gas evaporation have been investigated by high resolution TEM. The structural characteristic of penta-twinned particles is different from that of quasi-crystals that the five coherent or incoherent twin boundaries separating the twin oriented segments do not join up along a common edge. The lattice parameter is reduced by 4–5% in comparison to that of bulk gold. The formation of the penta-twinned particles is proposed to occur by particle collision. The particles were observed to be crystalline at ambient temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426919
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