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  • 1
    Electronic Resource
    Electronic Resource
    Allelopathic Potential of Aquatic Plants Associated with Wild Rice (Zizania palustris): I. Bioassay with Plant and Lake Sediment Samples (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 209-220 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; aquatic plants ; growth inhibition ; lake sediments ; seedling bioassay ; wild rice ; Zizania palustris ; Eleocharis smallii ; Equisitum fluviatile ; Myriophyllum verticillatum ; Nuphar variegatum ; Nymphaea odorata ; Potamogeton natan ; Scirpus acutus ; Sparganium fluuctuans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The allelopathic potential of eight aquatic plants associated with wild rice was investigated using lettuce and wild rice seedling bioassays. Rhizome aqueous extracts of Scirpus acutus, Potamogeton natans, Nymphaea odorata, Nuphar variegatum; shoot extract of Eleocharis smallii; whole plant extract of Myriophyllum verticillatum; and leaf extract of P. natans significantly reduced the root length of lettuce and wild rice seedlings. The lettuce seedling bioassay was more sensitive than the wild rice bioassay. Shoot growth was less affected than the root growth. Water extract of sediments associated with the aquatic plants had little growth inhibitory effect on wild rice. Our study did not yield any conclusive evidence that the wild rice-associated aquatic plants have allelopathic effects on wild rice. We emphasize the use of target species as a bioassay material in allelopathic studies. Further investigation on allelopathic effects of lake sediments associated with the neighboring plants of wild rice is necessary to evaluate their ecological significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020853620102
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  • 2
    Electronic Resource
    Electronic Resource
    Probabilistic formulation of a method for the evaluation of petroleum resources (1983)
    Springer
    Mathematical geology 15 (1983), S. 163-181 
    Details
    ISSN: 1573-8868
    Keywords: oil ; gas ; resources evaluation ; subjective probability ; multivariate lognormal ; exploration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Since 1973 the Geological Survey of Canada has been making estimates of the petroleum resources for Canadian sedimentary basins. The purpose of this activity has been to provide a systematic approach to making an inventory of petroleum resources for departmental planning purposes. The resource evaluation was processed by the Hydrocarbon Assessment System Processor (HASP), devised by the Geological Survey of Canada. Since then, demands on the evaluation capability have increased and at the same time evaluation data have been increasingly applied to economic analyses. HASP can no longer be adapted to handle the new challenges. This study contains a probabilistic formulation for HASP and establishes a framework from which the following may be calculated: (1)distribution of number of pools; (2)expected rth largest pool size and its distribution; and (3)generation of reservoir parameters for a given pool size. Play 10 from the East Coast of Canada was used as an example to illustrate the applications of the analytical approach presented. This paper demonstrates that the analytical approach has more to offer than HASP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030081
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  • 3
    Electronic Resource
    Electronic Resource
    Conditional analysis for petroleum resource evaluations (1983)
    Springer
    Mathematical geology 15 (1983), S. 349-361 
    Details
    ISSN: 1573-8868
    Keywords: oil ; gas ; play potential distribution ; rth largest pool size ; conditional probability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Conditional analysis is an essential component for evaluation of petroleum resources. Such analysis attempts to answer the questions: for the input data and a given play potential, what is the most likely number of pools and their sizes? An example is provided to illustrate the usage and application of this conditional method of analysis. This example demonstrates that the method can be used as a feedback mechanism to challenge the underlying geological concepts of the play; and to yield more certain predictions if additional information is given. Consequently, the method will enhance the reliability of the estimates of petroleum resources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01036075
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  • 4
    Electronic Resource
    Electronic Resource
    Allelopathic Potential of Aquatic Plants Associated with Wild Rice: II. Isolation and Identification of Allelochemicals (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 221-228 
    Details
    ISSN: 1573-1561
    Keywords: Allelochemicals ; Eleocharis smallii ; plant phenolics ; Scirpus acutus ; wild rice ; Zizania palustris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Aqueous extracts of rhizomes of Scirpus acutus and shoots of Eleocharis smallii were analyzed for the presence of phytotoxic compounds using ethyl acetate extraction. The organic fractions of the extract of Scirpus rhizomes contained lactic, succinic, fumaric, 2-hydroxysuccinic, 2-phenyl lactic, m-hydroxybenzoic, p-hydroxybenzoic, protocatechuic, dehydroabietic, and ferulic acids; p-hydroxybenzyl alcohol, p-hydroxyphenyl ethanol and catechin. The extract of Eleocharis shoots contained 4-methoxy phenol, benzofuran, benzene acetic acid, 1-hydroxy-5-methyl acetophenone, and 1,3,4-dimethoxyphenol ethanone identified by GC-Mass spectroscopy. The potential allelopathic effect of these compounds on wild rice under field conditions was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020805704172
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