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  • 1
    Electronic Resource
    Electronic Resource
    Calculations of rate constants for reactions of first and second row cations (1997)
    Springer
    Theoretical chemistry accounts 98 (1997), S. 33-41 
    Details
    ISSN: 1432-2234
    Keywords: Key words: Rate constants ; Cation reactions ; Adiabatic capture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract. Calculations of rate constants for 35 reactions of first and second row monocations with different neutrals are presented. A combined rotationally adiabatic capture and centrifugal sudden approximation is used. The majority of predicted rate constants are in good agreement with the experimental measurements. An exploration of energetics of the potential energy surface for some of those cases in which prediction fails has been done using ab initio G2 theory. These cases usually correspond to situations in which the reaction is not as exothermic as the application of capture approximation requires or secondary barriers exist in the reaction path. Second row cations present these kind of problems due to their smaller electronegativity with respect to cations of the first row.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002140050275
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Socioeconomic risk factors in the prevalence of asthma and other atopic diseases in children 6 to 7 years old in Valencia, Spain (1999)
    Springer
    European journal of epidemiology 15 (1999), S. 35-40 
    Details
    ISSN: 1573-7284
    Keywords: Asthma ; Atopic diseases ; Children ; Epidemiology ; Socio-economic status ; Tobacco smoke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A cross-sectional survey of a cohort study was carried out between June and December 1994 in Valencia, Spain (population in 1994: 764,293 inhabitants). Two hundred sixty public and private schools randomly selected from the total of schools in Valencia were invited to participate; 3948 children aged 6–7 years cooperated in our study after informed consent was obtained from parents and school director. The survey in Valencia is part of the International Study of Asthma and Allergy in Childhood (ISAAC). Prevalences for asthma, rhinitis and atopic dermatitis were determined and contrasted with socioeconomic status (SES) among children. No statistically significant associations were established between the prevalences of asthma, rhinitis and atopic dermatitis, and SES. However, atopic dermatitis was found to be common among upper class children (21.5 per 100 children). Likewise, significant associations were observed between the severity of atopy (2 or 3 atopic manifestations) and SES (p=0.000), being greater for lower strata (4.5 per 100 children); for the three SES level significant differences were established (p = 0.008) regarding passive exposure to tobacco smoke in the home.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007592121308
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    Paper (German National Licenses)
    Fulltext
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