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  • Disturbance  (1)
  • Ether treated bacteria  (1)
  • Ionophore  (1)
  • 1990-1994  (2)
  • 1980-1984  (1)
Collection
Keywords
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  • 1990-1994  (2)
  • 1980-1984  (1)
Year
  • 1
    Electronic Resource
    Electronic Resource
    CP-82,996, a novel diglycoside polyether antibiotic related to monensin and produced byActinomadura sp. (1990)
    Springer
    Journal of industrial microbiology and biotechnology 6 (1990), S. 135-142 
    Details
    ISSN: 1476-5535
    Keywords: Ionophore ; Actinomadura sp. (ATCC 53764) ; Anticoccidial agent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A new polyether antibiotic CP-82,996 (C50H86O16) was isolated by solvent extraction from the fermentation broth ofActinomadura sp. (ATCC 63764). Following purification by silica gel column chromatography and crystallization, the structure of CP-82,996 was determined by a single crystal X-ray analysis. The structure is closely related to monensin, but is unique in that it contains two sugar groups, whereas monensin has none. The1H and13C NMR chemical shifts and assignments for CP-82, 996 were elucidated, and they were compared with those determined previously for monensin. CP-82,996 is active against certain Gram-positive bacteria, and is a very potent anticoccidial agent. It effectively controlled chicken coccidiosis caused by severalEimeria species at 5–10 ppm in feed, and is 10–20 times more potent than monensin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01576433
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  • 2
    Electronic Resource
    Electronic Resource
    The role of litter in an old-field community: impact of litter quantity in different seasons on plant species richness and abundance (1990)
    Springer
    Oecologia 85 (1990), S. 8-13 
    Details
    ISSN: 1432-1939
    Keywords: Disturbance ; Litter ; Old-field ; Plant density ; Solidago canadensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We studied the effect of removing and adding plant litter in different seasons on biomass, density, and species richness in a Solidago dominated old-field community in New Jersey, USA. We removed all the naturally accumulated plant litter in November (658 g/m2) and in May (856 g/m2) and doubled the amount of litter in November and May in replicated plots (1 m2). An equal number of plots were left as controls. Litter removal and addition had little impact on total plant biomass or individual species biomass in the growing season following the manipulations. Litter removal, however, significantly increased plant densities but this varied depending upon the season of litter removal, species, and life history type. Specifically, the fall litter removal had a much greater impact than the spring litter removal suggesting that litter has its greatest impact after plant senescence in the fall and prior to major periods of early plant growth in spring. Annual species showed the greatest response, especially early in the growing season. Both spring and fall litter removal significantly increased species richness throughout the study. Litter additions in both spring and fall reduced both plant densities and species richness in June, but these differences disappeared near the end of the growing season in September. We concluded than in productive communities where litter accumulation may be substantial, litter may promote low species richness and plant density. This explanation does not invoke resource competition for the decline in species richness. Finally, we hypothesize that there may be broad thresholds of litter accumulation in different community types that may act to either increase or decrease plant yield and diversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317337
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  • 3
    Electronic Resource
    Electronic Resource
    The complete sequence of murein synthesis in ether treated Escherichia coli (1983)
    Springer
    Archives of microbiology 136 (1983), S. 297-299 
    Details
    ISSN: 1432-072X
    Keywords: Antibiotics ; β-Lactams ; Murein synthesis ; Ether treated bacteria ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The in vitro synthesis of murein from the precursors UDP-N-acetylglucosamine, l-alanine, d-glutamic acid and meso-diaminopimelic acid was performed with the aid of ether treated Escherichia coli. This synthesis was sensitive to representative inhibitors of early reactions in the cytoplasm as well as of late reactions in the membrane or the cell wall. The sensitivity was higher than in in vitro systems starting with UDP-N-acetylmuramic acid or UDP-N-acetylmuramylpentapeptide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425220
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