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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical biology 22 (1985), S. 21-29 
    ISSN: 1432-1416
    Keywords: Wright-Fisher model ; selective advantage ; ultimate homozygosity ; martingale methods ; coupling techniques ; fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The Wright-Fisher model is considered in the case where the population size is random and the magnitude of the selective advantage of one of the alleles varies with time. The central question addressed is the possibility of ultimate genetic polymorphism. Partial results are obtained in the general case and complete results in the case where the population size and selective advantage are not density dependent. Bounds on the fixation probability are obtained when the selective advantage is constant.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2277
    Keywords: Age difference, donor-recipient ; Donor-recipient age difference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Whilst HLA matching is routine in renal transplantation the possible benefits of matching donor to recipient age have not been previously explored. The simultaneous effect on graft survival of donor and recipient age was therefore investigated for 274 consecutive first cadaver transplant recipients treated by cyclosporin immunosuppression in two centres. The overall graft survival was 77%, and was not significantly different between the two centres. Individually there was no significant effect of donor or recipient age but taken together, the difference in age significantly affected graft survival (P〈0.01) regard-less of the mode of failure. The 1-year graft survival for all failures was 66.2% when the donor was 5 or more years older, 84.5% when the donor was 5 or more years younger and 71.7% when the donor was within 5 years of the recipient's age. Multivariate analysis, taking into account other variables (HLA matching, dialysis time and type, donor/recipient sex, local/imported kidneys, sensitivity, operation time, total ischaemic time, pre-operative transfusions) indicated that age difference was the single most important variable (P〈0.01). The only other important covariate risk factor in improving graft survival was HLA-DR matching (P〈0.05). Donor-recipient age difference is a potentially important recipient selection criterion in cyclosporin-treated renal transplant patients.
    Type of Medium: Electronic Resource
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