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  • Column liquid chromatography  (2)
  • Lactose carrier  (2)
  • equine leukoencephalomalacia  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Galactoside-dependent proton transport by mutants of the Escherichia coli lactose carrier: substitution of tyrosine for histidine-322 and of leucine for serine-306
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 982 (1989), S. 253-264 
    Details
    ISSN: 0005-2736
    Keywords: Cotransport ; Galactoside dependence ; Lactose carrier ; Proton transport ; Transport energetics ; lacY
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(89)90062-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The lactose carrier of Klebsiella pneumoniae M5a1; the physiology of transport and the nucleotide sequence of the lacY gene
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 945 (1988), S. 315-323 
    Details
    ISSN: 0005-2736
    Keywords: (E. coli) ; (K. pneumoniae) ; Amino acid sequence ; Lactose ; Lactose carrier ; Melibiose ; Proton cotransport ; Thiomethylgalactoside
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(88)90494-4
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental reproduction of ELEM (1992)
    Springer
    Mycopathologia 117 (1992), S. 115-120 
    Details
    ISSN: 1573-0832
    Keywords: Fumonisins ; equine leukoencephalomalacia ; mycotoxins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An experiment to gain insight into the minimum toxic dose of fumonisins was conducted by feeding ponies rations with known fumonisin concentrations. Naturally contaminated corn screenings (CS) were blended with pellets, corn, and molasses to formulate individual daily diets. One group of 4 ponies was fed a ration with fumonisin B1 (FB1) varying from 〈1 ppm to 22 ppm. A second group of 5 ponies was fed a ration at varying rates containing 8 ppm FB1 for 180 days. A panel of clinical chemistry parameters was evaluated twice weekly for both groups. One pony in the first group died of equine leukoencephalomalacia (ELEM) after 225 days of which the final 55 days' diet contained 22 ppm FB1. Approximately 9 days prior to death, this animal experienced elevated liver chemistry values. All 5 ponies in the second group experienced mild, transient, clincal signs; were euthanized at 180 days; and had mild, histopathological brain lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00497287
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  • 4
    Electronic Resource
    Electronic Resource
    Concentrations of fumonisin B1 in feeds associated with animal health problems (1991)
    Springer
    Mycopathologia 114 (1991), S. 129-135 
    Details
    ISSN: 1573-0832
    Keywords: Fumonisin B1 fumonisin B2 ; equine leukoencephalomalacia ; swine pulmonary edema ; animal feeds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ninety-eight samples of feeds associated with 44 cases of equine leukoencephalomalacia (ELEM) and 83 samples of feed associated with 42 cases of a porcine pulmonary edema syndrome (PPE) were analyzed for fumonisin B1 (FB1). For comparison purposes, 51 feed samples not associated with PPE or ELEM were also analyzed. Feed associated with ELEM contained FB1 ranging from less than 1 μg/g to 126 μg/g with 75% of the cases having at least 1 sample above 10 μg/g. Feeds associated with PPE ranged from less than 1 μg/g to 330 μg/g with 71% of the cases having at least 1 sample greater than 10 μg/g. Quantitation was by high performance liquid chromatography (HPLC)/fluorescence using the fluorescamine derivative with confirmation by thin layer chromatography (TLC) and/or gas chromatography/mass spectroscopy (GC/MS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437200
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  • 5
    Electronic Resource
    Electronic Resource
    A particle size distribution analysis of stressed HPLC column packing material (1991)
    Springer
    Chromatographia 31 (1991), S. 362-366 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Particle size distribution ; Stationary phase stress ; Silica gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A particle size distribution analysis has been completed on three different HPLC column packing materials including silica gel (Si60) and two bonded phases (RP8 and RP18). The stationary phases were subjected to 18 hours stress with 1 N or 3 N KOH and found to have quantitatively different distribution patterns initially, at 13 hours and finally at 18 hours although the average particle diameters for the Si60 and RP8 were the same or higher at 18 hours as initially. Thirteen hoursstress with sodium octanesulfonate, tetrabutylammonium phosphate and ammonium acetate at exaggerated conditions also resulted in distributional changes with the Si60 and RP8 decreasing in average particle diameter when exposed to ammonium acetate and tetrabutylammonium stressing respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262193
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  • 6
    Electronic Resource
    Electronic Resource
    A particle size distribution analysis of used HPLC column packing material (1993)
    Springer
    Chromatographia 35 (1993), S. 295-301 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Used column packings ; Particle size distribution ; Scanning electron microscopy ; Column age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Particle size distribution analysis and scanning electron microscopy (SEM) were carried out on eight used HPLC columns containing either irregular silica based, spherical silica based or spherical polymer based packing material. Particle size distributions of the used irregular silica based columns were at least bimodat at the outlet ends and either biomodal or log-normal at the inlet ends with regular progressions between the two extremes through the column. A new ODS-3 column showed log-normal size distributions from the inlet to the outlet ends. Spherical silica based column particle size distributions showed distinct shoulders on large central distribution peaks in most column sections with various degrees of shoulder erosion. The spherical resin based column showed a broader inlet particle size distribution progressing to a very narrow outlet distribution. SEMs of both irregular and spherical silica based columns revealed a larger number of undersized particles and debris at the outlet than inlet ends which could have resulted from stationary phase degradation, since this was not seen in the new ODS-3 column. While several SEMs of the spherical silica based columns revealed hollow spheres and twins, the spherical resin based column packing showed stress fractures or wrinkle lines resulting from use or dehydration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277513
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    Paper (German National Licenses)
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