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  • 1
    Electronic Resource
    Electronic Resource
    Combining MAGEX with random phases (1992)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 9-11 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An algorithm is described which combines the magic integer concept with that of representing a large number of phases by random numbers. The process, called MAGEX89, is more economical than previous magic integer approaches and in a number of tests its performance compares favourably with those of other commonly used methods of solving small structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391007286
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Expression and characterization of the τ subunit of phosphorylase kinase
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 161 (1989), S. 746-753 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(89)92663-6
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  • 3
    Electronic Resource
    Electronic Resource
    Direct injection analysis of hexamethylene bisacetamide in biological fluids by an HPLC column switching technique with a micellar mobile phase (1992)
    Springer
    Chromatographia 34 (1992), S. 63-66 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Micellar mobile phase ; Direct injection of biological fluids ; Hexamethylene bisacetamide (HMBA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper describes the direct injection analysis of the anti-cancer drug hexamethylene bisacetamide (HMBA) in biological fluids by an HPLC column switching technique. The first chromatographic column, which provides for sample extraction and cleanup, employs a micellar mobile phase with SDS as the modifier. The second column, coupled on-line to the first, utilizes reversed-phase conditions for analysis. UV detection is employed at 210 nm. 282 samples from 12 cancer patients were analysed and good pharmacokinetics curves obtained. The drug gives recoveries of 94.0–100.9% with a relative standard deviation of 1.88%. A sample analysis is completed within 15 minutes. This method should be satisfactory not only for the analysis of HMBA but also, probably for other drugs in biological fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290461
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    System peaks in single column ion chromatography (SCIC) with indirect spectrophotometric detection (1994)
    Springer
    Chromatographia 39 (1994), S. 713-718 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion chromatography ; System peaks ; Indirect detection ; Anions and cations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The most popular eluents for SCIC are organic acids and their salts with one or more kinds of ion taking part in the elution process. These ions compete for ion-exchange equilibria. After an injection, the equilibria are disturbed and a re-equilibration process occurs resulting in extraneous peaks (system peak). A mechanism based on these aspects is proposed which is used successfully in the interpretation of the effects of sample properties and eluent parameters on system peaks. Experiments in the analysis of both cations and anions have been carried out to support this mechanism with eluents comprising two kinds of eluent ions. An equation for capacity factors in such systems is also derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274588
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  • 5
    Electronic Resource
    Electronic Resource
    Polysiloxane-encapsulated stationary phase for reversed-phase high-performance liquid chromatography (1997)
    Springer
    Chromatographia 44 (1997), S. 263-266 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Encapsulated stationary phase ; Poly(methylvinylsiloxane)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Silica beads of 6-μm average diameter were silanized with methylvinyldiethoxysilane and then subjected to encapsulation with poly(methylvinylsiloxane). The resulting product is a new stationary phase for reversed-phase high performance liquid chromatography (RP-HPLC) which has superior ability for the separation of polar, non-polar and basic compounds. The chromatographic peaks are symmetric. Its stability has been studied; after continuous use for three months the carbon content and chromatographic behaviour of the phase were unchanged. on to the silica surface to given an uniform organic film. Material prepared in this way has both good chromatographic behaviour and superior selectivity. Because contact of the silica matrix with the mobile phase is avoided, the alkali-resisting ability of the stationary phase is increased. The non-specific adsorption of alkaline solutes on to the silica surface is also avoided because of the complete coverage of surface silanol groups. Reports of stationary phases encapsulated with polystyrene [6], polybutadiene [I] and octadecylsiloxane polymers have recently appeared in the literature [3]. In this paper we report the encapsulation of poly-(methylvinylsiloxane) (analogous to the phase SE-31 often used in GC) on to a silica matrix previously modified with methylvinyldiethoxysilane. The resulting phase has superior performance in reversed-phase HPLC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466392
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