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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of plant pathology 91 (1985), S. 137-150 
    ISSN: 1573-8469
    Keywords: computer simulation ; dose response relation ; epidemiology ; Coccomyces hiemalis ; Venturia inaequalis ; box car train
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Het concept van dosis/response met de logaritme van tijd als de dosis en het percentage gekiemde sporen als response is geïntroduceerd in een model met parallelle boxcars, waarbij iedere spore zijn eigen boxcar bezit bij de overgang van de ongekiemde naar de gekiemde toestand. Het populatiegedrag is gemodelleerd door de kwantale responsie van iedere spore als stochastische variabele te hanteren. Wachttijden tot kieming werd gegenereerd uit de normaal, lognormaal, gamma en exponentiële verdeling die in het computerprogramma aanwezig waren. Er werd goede overeenkomst gevonden tussen gesimuleerde en waargenomen kieming bij een reeks van vijf pathogene schimmels. Verschillende hypothesen over de rol van individuele sporen voor het gedrag van het totaal werden getoetst en het effect van variabele temperatuur, inoculumdichtheid en infectie-efficiëntie werd nagegaan. Het stochastische model met parallelle boxcars is een goed alternatief voor de boxcars die in serie zijn geplaatst teneinde dispersie in tijd of ruimte na te bootsen, wanneer er verschillen in reactie tussen individuele sporen bestaan.
    Notes: Abstract The concept of dose/response with logarithm of time being the dose and percent germination the response is introduced into a parallel box car model, where each spore in a population passes through its own box during its change from an ungerminated to a germinated state. Population behaviour is modelled by simulating the quantal responses of each of its members as stochastic random variables. Waiting times until germination were generated using the normal, lognormal, gamma, and exponential distributions in a computer simulation program. Good agreement with observed germination of five fungal pathogens was obtained. Methods are discussed pertaining to hypothesis testing concerning the role individuals contribute to the behaviour of the population as a whole. Two methods of handling changing temperatures are examined. Effects of inoculum density, infection efficiency, and variable temperature were incorporated into the simulation program. The stochastic model using parallel boxes offers an alternative to deterministic serial box car models which are used to mimic dispersion in time during development.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 76 (1994), S. 133-138 
    ISSN: 1573-5060
    Keywords: vertical gene transfer ; sequence homology ; gene swapping ; risk analysis ; evolution ; HGT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Presented here is an assessment on the putative biohazard of spontaneous horizontal gene transfer (HGT) in plants. Suggestions for spontaneous HGT between sexually incompatible plant species and between plants and microorganisms are numerous. The novel argument is sequence homology, but this argument is known to be invalid or at least inadequate. Only one case was found for HGT from a bacterium to a plant. This most probably took place in the evolutionary past. None of the supposed HGT cases brought forward up to the end of 1992 include the description of a mechanism by which a DNA fragment is detached from one genome, passed at least one membrane, and is inserted into another plant genome. Spontaneous HGT to plants with subsequent vertical (trans) gene transfer through normal seed set cannot be totally excluded, however, the literature up to 1993 does not provide any scientifically valid indication that such an HGT should be considered as a realistic biohazard.
    Type of Medium: Electronic Resource
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