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  • 1
    Electronic Resource
    Electronic Resource
    Multivariate imputation in cross-sectional analysis of health effects associated with air pollution (1995)
    Springer
    Environmental and ecological statistics 2 (1995), S. 191-212 
    Details
    ISSN: 1573-3009
    Keywords: multivariate interpolation ; kriging ; respiratory morbidity ; air pollution ; sulphates ; nitrates ; ozone ; Ontario Health Study ; environmental monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We demonstrate a recently developed spatial interpolation methodology in a study of the chronic effects of air pollution on respiratory morbidity. Our study uses data from the Ontario Health Study, a large survey of households in Ontario conducted for the province by Statistics Canada. The interpolation procedure imputes unobserved vectors of air pollution concentrations for individual Public Health Units, from those observed at a few fixed air pollution monitoring sites. We use logistic regression methods to assess the significance of air pollution levels based on the imputed values after modelling the relationship between binary health responses and assorted covariates such as measures of life style. Our findings prove negative; no significant relationship between chronic respiratory morbidity and air pollution is found. The imputation methodology is seen to be promising and might well be used in other such analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456664
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  • 2
    Electronic Resource
    Electronic Resource
    Diversity ofFrankia strains isolated from a single alder stand (1989)
    Springer
    Plant and soil 118 (1989), S. 13-22 
    Details
    ISSN: 1573-5036
    Keywords: Frankia ; hybridization ; nif genes ; plasmid ; RFLPs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract One hundredFrankia strains isolated from variousAlnus species in a single alder stand were tested for plasmid presence. Plasmid DNA was observed in five of the frankiae strains and was analyzed. We found that plasmids with a similar molecular weight exhibited in fact minor divergences in restriction patterns. The genetic diversity among the five isolates which contained plasmids and seven isolates which contained no plasmid DNA were examined by using restriction endonucleas digestions, Southern hybridization ofnifHDK,nifAB genes, andFrankia cryptic DNA fragments determined ‘at random’. Results indicate that genomic DNA digestion patterns and Southern hybridizations to anifHDK probe were not able to discriminate between closely related frankiae. On the other hand, plasmid presence, Southern hybridization to anifAB proble or to a crypticFrankia probe allowed us to delineate groupings of these isolates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02232786
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