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  • 1
    Electronic Resource
    Electronic Resource
    Multinuclear magic-angle spinning and double-rotation NMR study of the synthesis and assembly of a sodalite semiconductor supralattice (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 6744-6752 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100195a040
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  • 2
    Electronic Resource
    Electronic Resource
    Psychosocial Adjustment in Siblings of Children with Chronic Life-Threatening Illness: a Research Note (1992)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of child psychology and psychiatry 33 (1992), S. 0 
    Details
    ISSN: 1469-7610
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Abstract The psychosocial functioning of 10 siblings of children with chronic life-threatening illness and their parents was compared with id healthy matched controls. The main differences found were in family relationships, with the index siblings expressing more negative emotion in relation to their fathers than controls, index mothers being less involved in social activities and index fathers being less involved with tin- extended family. No significant differences were found in any of the measures of depression, anxiety and sell' concept. Index siblings expressed a number of other concerns such as a fear of the break up of their family after the sick child died. The need for increased awareness of the welfare of healthy siblings as well as closer involvement of the fathers is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1469-7610.1992.tb00913.x
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  • 3
    Electronic Resource
    Electronic Resource
    Phylogenic homogeneity of Coxiella burnetii strains as determinated by 16S ribosomal RNA sequencing (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 113 (1993), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract DNA coding for the 16S rRNA of six strains of the obligate intracellular bacterium Coxiella burnetti was directly amplified from lysed host cells using the polymerase chain reaction. The amplification product was sequenced using a linear-PCR procedure and compared with other published 16S rRNA sequences. The results of this analysis confirm the position of C. burnetii in the gamma subgroup of the proteobacteria. The data show that all of the C. burnetii strains are highly related (〉 99%) on the basis of 16S rRNA sequences although they had different geographic origins and phenotypic characteristics. The data support a phylogenetic homogeneity of the genus Coxiella with only one species which is C. burnetii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1993.tb06537.x
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the substitution patterns of cellulose methyl ethers by HPLC and GLC-comparison of methods (1992)
    Springer
    Polymer bulletin 29 (1992), S. 349-356 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The substitution patterns of methyl cellulose as well as of a thexyldimethylsilyl cellulose after permethylation were determined by hydrolysis and separation of the resulting partially methylated glucoses without further derivatization by h.p.l.c.. On an amine-modified silica column the solutes get separated into glucose, 2,3,6-tri-O-methyl glucose and the groups of mono-O-methyl-and di-O-methyl glucoses. A chromatographic run on a reversed-phase column enables the identification of the single mono-O-methyl- and di-O-methyl glucoses. In this way, a determination of both the average degree of substitution and the substitution pattern of cellulose derivatives is possible. Comparison of the results with those obtained by standard methylation analysis including g.l.c.-m.s. proves the correctnes of the method employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944830
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  • 5
    Electronic Resource
    Electronic Resource
    Spatial variability and interpolation of daily precipitation amount (1992)
    Springer
    Stochastic environmental research and risk assessment 6 (1992), S. 304-320 
    Details
    ISSN: 1436-3259
    Keywords: geostatistics ; precipitation ; water balance models ; semivariogram ; kriging ; spatial variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Daily precipitation amounts show spatial variation over sub-continential regions. Point measurements, represntative for regions of land, have to be interpolated towards unobserved locations. In this study four days in 1984 were selected to investigate the spatial variability of daily precipitation amount in north-western Europe in relation to the meteorological conditions. Data were interpolated using kriging. Crossvalidation was used to compare interpolated values with measured values. Large differences in the spatial structure of daily precipitation amount are observed as a result of different meteorological conditions. Stratification of the study area into a coast, a mountain and an interior stratum proved to be successful, reducing the Mean Squared Error of Prediction with up to 55%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01581623
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  • 6
    Electronic Resource
    Electronic Resource
    Spatial variability and interpolation of daily precipitation amount (1992)
    Springer
    Stochastic environmental research and risk assessment 6 (1992), S. 209-221 
    Details
    ISSN: 1436-3259
    Keywords: geostatistics ; precipitation ; water balance models ; semivariogram ; kriging ; spatial variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Daily precipitation amounts show spatial variation over sub-continential regions. Point measurements, representative for regions of land, have to be interpolated towards unobserved locations. In this study four days in 1984 were selected to investigate the spatial variability of daily precipitation amount in North-western Europe in relation to the meteorological conditions. Data were interpolated using Kriging. Crossvalidation was used to compare interpolated values with measured values. Large differences in the spatial structure of daily precipitation amount are obsered as a result of different meterological conditions. Stratification of the study area into a coastal, a mountainous and an interior stratum proved to be successful, reducing the Mean Squared Error of Prediction with up to 55%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01581451
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial variability of earthworm populations in a permanent polder grassland (1992)
    Springer
    Biology and fertility of soils 14 (1992), S. 260-266 
    Details
    ISSN: 1432-0789
    Keywords: Earthworm activity ; Geostatistics ; Dispersal rate ; Spatial variability ; Land reclamation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We studied the earthworm distribution in a permanent polder grassland by making two detailed surveys in 1983 and in 1990. Geostatistical procedures were used to investigate the changes in species composition and to determine the dispersal rate. Attention was focused on two soil survey variables closely related to earth-worm distribution, the thickness of the Ah horizon and the number of burrows. The dispersal rate between the two survey dates was 13 m year−1 compared with 10 m year−1 before 1983. The difference was attributed either to the development of new population centres due to dispersal by cow's feet or tractor wheels, this altering the spatial dynamics, or to a lag phase in population development in the years following inoculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395461
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  • 8
    Electronic Resource
    Electronic Resource
    A statistical analysis of the influence of Striga hermonthica on maize yields in fertilizer trials in Southwestern Kenya (1991)
    Springer
    Plant and soil 138 (1991), S. 1-8 
    Details
    ISSN: 1573-5036
    Keywords: fertilizer trials ; Kenya ; maize ; Striga hermonthica ; sunflower
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The adverse effect of the parasitic weed Striga hermonthica on yield of maize was studied in a fertilizer trial in Southwestern Kenya. In two years of experimentation (1987 and 1988), the weed had a highly significant, negative impact on maize yields. The spotty incidence of Striga disturbed the fertilizer trials. Inclusion of the degree of Striga infestation in a regression model caused an increase in the fraction of experimental variation that could be explained by the model. Several methods were tested to combat Striga. Hand-pulling reduced Striga incidence and increased grain yields during the following growing season. No clear effect was obtained from the trap crop sunflower, although such an effect may have been concealed by the success of hand-pulling. Application of mineral fertilizers or farmyard manure did not significantly reduce Striga infestation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011801
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  • 9
    Electronic Resource
    Electronic Resource
    Spatial variability and sampling of cyanide polluted soil on former galvanic factory premises (1992)
    Springer
    Water, air & soil pollution 61 (1992), S. 1-16 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Former galvanic factory premises are often heavily contaminated with cyanide, requiring redevelopment of the soil. In this study attention is focused on one particular site in the Netherlands. In an area of 0.8 ha 344 observations were taken at different depths in the upper 3 m of soil. Three different procedures based on spatial variability studies are compared to calculate the extent of polluted soil as well as the uncertainties associated with it on the basis of this number of observations. As it turns out, a more evenly distributed data configuration results in a reduction of the extent of soil to be redeveloped when the decision procedure involved is based on the probability of exceeding a critical concentration level. Hence a small but structural reduction of the associated costs was achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00478362
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  • 10
    Electronic Resource
    Electronic Resource
    Cokriging nonstationary data (1991)
    Springer
    Mathematical geology 23 (1991), S. 703-719 
    Details
    ISSN: 1573-8868
    Keywords: cokriging ; increments ; non-stationarity ; multivariate random function ; pseudo-covariance function ; pseudo-cross-covariance function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Universal cokriging is used to obtain predictions when dealing with multivariate random functions. An important type of nonstationarity is defined in terms of multivariate random functions with increments which are stationary of orderk. The covariance between increments of different variables is modeled by means of the pseudo-cross-covariance function. Criteria are formulated to which the parameters of pseudo-cross-covariance functions must comply so as to ensure positive-definiteness. Cokriging equations and the induced cokriging equations are given. The study is illustrated by an example from soil science.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02082532
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