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  • 1
    Electronic Resource
    Electronic Resource
    Double Pore Silica Gel Monolith Applied to Liquid Chromatography (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 547-552 
    Details
    ISSN: 1573-4846
    Keywords: silicon alkoxide ; phase separation ; double pore structure ; liquid chromatography ; Van Deemter equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica gels retaining double pore structure in the size ranges of micrometer and nanometer have been applied to the rod-shaped monolithic column for liquid chromatography. The macropore structure was designed by controlling the phase separation process induced by the hydrolysis and polycondensation of alkoxysilane, whereas the mesopore structure was tailored by the solvent exchange treatments on wet gels. The size exclusion chromatograms on polystyrene standards exhibited almost similar features for octadecyl-modified rod and conventional packed beads columns. The dependence of plate height on the velocity of mobile phase determined for amylbenzene was by far weaker in the rod column than in the packed beads column, suggesting that additional geometrical factors should be considered in describing the separation mechanism in the rod column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018331101606
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure Design of Double-Pore Silica and Its Application to HPLC (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 163-169 
    Details
    ISSN: 1573-4846
    Keywords: silica gels ; phase separation ; pore size distribution ; liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Utilizing the concurrence of polymerization-induced phase separation and sol-gel transition in the hydrolytic polycondensation of alkoxysilanes, a well-defined macroporous structure is formed in a monolithic wet gel. By exchanging the fluid phase of the wet gel with an appropriate external solution, the nanometer-range structure of the wet gel can be reorganized into structures with larger median pore size essentially without affecting the macroporous framework. The double-pore structure thus prepared is characterized by open pores distributed in discrete size ranges of micrometers and nanometers. A new type of chromatographic column (silica rod) has been developed using monolithic double-pore silica instead of packed spherical gel particles. Typical silica rod columns had significantly reduced pressure drops and improved analytical efficiencies which do not deteriorate even at higher sample flow rates, both arising from a greater macropore volume than particle packed columns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008644514849
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Double pore silica gel monolith applied to liquid chromatography (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 547-552 
    Details
    ISSN: 1573-4846
    Keywords: silicon alkoxide ; phase separation ; double pore structure ; liquid chromatography ; Van Deemter equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica gels retaining double pore structure in the size ranges of micrometer and nanometer have been applied to the rod-shaped monolithic column for liquid chromatography. The macropore structure was designed by controlling the phase separation process induced by the hydrolysis and polycondensation of alkoxysilane, whereas the mesopore structure was tailored by the solvent exchange treatments on wet gels. The size exclusion chromatograms on polystyrene standards exhibited almost similar features for octadecyl-modified rod and conventional packed beads columns. The dependence of plate height on the velocity of mobile phase determined for amylbenzene was by far weaker in the rod column than in the packed beads column, suggesting that additional geometrical factors should be considered in describing the separation mechanism in the rod column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436897
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Intracellular application of polyamine and polyamine amide inhibits the quisqualate-sensitive ionotropic glutamate receptor of locust (Schistocerca gregaria) muscle (1997)
    Springer
    Invertebrate neuroscience 2 (1997), S. 223-233 
    Details
    ISSN: 1439-1104
    Keywords: philanthotoxins ; patch clamp ; locust muscle ; ionotropic glutamate receptor ; intracellular injection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of intracellularly-applied philanthotoxin-343 (PhTX-343) on single channel currents gated by quisqualate-sensitive glutamate receptors (qGluR) of locust leg muscle have been studied. PhTX-343 initially increased qGluR channel open probability, mainly by virtue of an increase in mean channel open time, but this was followed by a decrease in channel open probability, sometimes to zero, because of a decline in the frequency of channel openings and a decline in mean channel open time. These results suggest that antagonism of qGluR by PhTX-343 can arise, in part, through binding of the toxin to a site or sites on the intracellular domain of this receptor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211935
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The action of philanthotoxin-343 and photolabile analogues on locust (Schistocerca gregaria) muscle (1995)
    Springer
    Invertebrate neuroscience 1 (1995), S. 159-172 
    Details
    ISSN: 1439-1104
    Keywords: glutamate receptors ; locust muscle ; photolabile philanthotoxins ; voltage clamp ; patch clamp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of philanthotoxin-343 (PhTX-343; tyrosyl-butanoyl-spermine) and photolabile analogues of this synthetic toxin on locust (Schistocerca gregaria) skeletal muscle have been investigated using whole muscle preparations (twitch contractions), single muscle fibres (excitatory postsynaptic currents (EPSCs)) and muscle membrane patches containing single quisqualate-sensitive glutamate receptors (qGluR). Analogues containing an azido group attached to either the butanoyl side-chain of PhTX-343 or as a substitute for the hydroxyl moiety of the tyrosyl residue were about 6 fold more potent antagonists than PhTX-343; those with an azido group located at the distal end of the toxin molecule were generally 2–3 fold less potent than PhTX-343. When these compounds were tested in subdued light, they were reversible antagonists of the muscle twitch, EPSC and qGluR. When a muscle was irradiated with U.V. during application of photolabile toxin combined with either neural stimulation of the muscle orl-glutamate application, antagonism of the twitch, EPSC and qGluR was complete and irreversible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02331913
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    Paper (German National Licenses)
    Fulltext
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