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  • 1
    Electronic Resource
    Electronic Resource
    Silicon-29 NMR study of silica (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 6412-6418 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00042a018
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitive analysis of Laue diffraction patterns recorded with a 120 ps exposure from an X-ray undulator (1992)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 25 (1992), S. 414-423 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray Laue diffraction patterns with an exposure time of 120 ps have been obtained from single crystals of an indole alkaloid and of the enzyme lysozyme using the X-rays emitted as a single bunch of electrons traverses a hard X-ray undulator inserted in CESR, the Cornell Electron–Positron Storage Ring. The patterns were recorded on a sensitive storage-phosphor detector. Despite complexities posed by the sharp variation of the incident X-ray spectrum with wavelength and the weakness of the diffraction patterns, accurate crystallographic structure amplitudes were extracted from the Laue intensities by the generalized scale-factor approach to the determination of the wavelength- and position-dependent correction factors. The results show that crystallography is feasible on the 100 ps time scale and open up the prospect of time-resolved measurements of ultra-rapid changes in molecular structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889891014826
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of oral cyclosporin A in diabetic children and adolescents (1990)
    Springer
    European journal of clinical pharmacology 38 (1990), S. 181-184 
    Details
    ISSN: 1432-1041
    Keywords: cyclosporin A ; diabetic children ; pharmacokinetics ; dose adjustment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Cyclosporin A (CsA) pharmacokinetics was studied in 19 diabetic children (mean age: 10.6 y). They were divided into prepubertal (I) and pubertal (II) groups according to plasma oestradiol or testosterone concentrations. The kinetic study was performed after a 72 h wash out period and a single oral dose of 7.5 mg/kg CsA. CsA in blood was measured by HPLC. The kinetic parameters: Cmax, tmax, t1/2, AUC, CL/f, Vz/f and tss were calculated. No significant difference was found between the two groups. A significant negative correlation was found between Vz and both total cholesterol (r=0.46), VLDL+LDL−cholesterol (r=−0.49) and VLDL+LDL−phospholipids (r=−0.58). CsA kinetics at steady-state were simulated by superimposition of single dose kinetics derived from each single dose. Measured steady-state blood concentrations were correlated (r=0.80) with the values predicted by the simulation. The results suggest that CsA adjustment dosage of the CsA may be performed after a single oral dose using blood levels measured by HPLC. This procedure requires validation in further studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265981
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  • 4
    Electronic Resource
    Electronic Resource
    New synthesis of alkyldihydrosilanes and their applications in modification of silica gel (1991)
    Springer
    Chromatographia 31 (1991), S. 335-341 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Bonded phase synthesis ; Alkyl and aryldimethyl phases ; CP/MAS NMR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A comparison of newly synthesized, reversed-phase bonded stationary phases is presented. The materials studied include monomeric n-octyl, n-octadecyl, aryl and n-octyldihydrogeno bonded-phases. Differences in reactivity of the silane functional groups are demonstrated and the high coverage obtained with the hydrogeno-bonded phases is shown. The structures of the bonded phases have been determined by29Si and13C CP/MAS NMR spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262188
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  • 5
    Electronic Resource
    Electronic Resource
    Application of NMR spectroscopy to the characterization of elastomer/filler interactions (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 2223-2232 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Proton spin-spin relaxation time measurements have been performed at 300 and 400 MHz on bound rubber-filler mixes resulting from the solvent extraction of silica-filled and silicafilled-modified polybutadiene, on the one hand, and of carbon black-filled and carbon blackfilled-modified styrene butadiene rubber, on the other hand. Two relaxation times are observed for all samples. They are ascribed to the occurrence of tightly and loosely bound rubber components, respectively. The effect of the grafting modification of the fillers on the formation of bound rubber and its two components is discussed. © 1992 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070461220
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  • 6
    Electronic Resource
    Electronic Resource
    Chromatographic and EPR study of poly(vinylimidazole) copper(II) complexes supported on silica (1993)
    Springer
    Chromatographia 37 (1993), S. 584-592 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Metal-interaction phases ; PVI coated silica ; PVI-Cu(II) complexes ; Cu(II) EPR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Cu(II) complexes of poly(1-vinylimidazole) immobilized on silica particles have been used as stationary phases for immobilized metal affinity chromatography of some proteins. Chromatographic data are reported which suggest that protein retention depends on the ionic strength in the column before and during loading with Cu(II). It has been shown by EPR spectroscopy that [Cu(Im)6]2+-type complexes were predominant when Cu(II) binding was performed in pure water. When performed under conditions of greater ionic strength, lower complexes are probably also formed. Protein retention has been shown to depend on other factors, such as the amount of Cu(II) bound to the column and the composition of the mobile phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274106
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