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  • 1
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Publishing Ltd.
    Weed research 42 (2002), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A mathematical model has been developed for the risk assessment of the spread of genes conferring herbicide resistance in plant populations. The model combines an age-and-stage-structured population dynamic model, a population genetic model and a model of spatial spread. This is achieved by embedding a local matrix population model into a cellular automaton model with raster cells as spatial units. The dynamics of each cell is determined by both its local dynamics and the interaction with neighbouring cells. The model is applied to the evaluation of management strategies to delay or even to prevent long-term evolution of resistance in an annual grass weed. The results show that the appearance and spread of resistant genes is a highly non-linear process exhibiting threshold phenomena, which occur for a wide range of parameters. The properties of the seed survival curve constitute the `genetic memory' of the system and thus determine its long-term dynamics. It is possible to delay the evolution of resistance by suspension of treatment, reduction in herbicide application rate and introducing fallow periods. Spatial spread from an infested plot is inhibited by leaving untreated strips between adjacent fields.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science, Ltd
    British journal of dermatology 145 (2001), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Gynäkologe 33 (2000), S. 164-171 
    ISSN: 1433-0393
    Keywords: Schlüsselwörter Onkologie ; Gynäkologie ; Informationsverarbeitung ; Computerprogramme ; Datenerhebung ; Datenbank ; Krebstegister ; Key words Oncology ; Gynecology ; Information technology ; Software ; Database ; Data collection ; Registries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Information technologies have been integrated in gynecological oncology treatment and, therefore, new software has been established in hospitals and private clinics. A German law for hospital tumor registration has attempted to unify the different strategies. All intentions to establish new documentation systems for tumor diseases need a standardized basic data set. Nevertheless, local governmental health organizations are not yet prepared to implement a global information system such as prenatal and perinatal care databases. Financial support and political work is therefore needed.
    Notes: Zusammenfassung Trotz der zunehmenden Integration von Informationstechnologie (IT) im Bereich der klinischen Medizin ist eine zufriedenstellende Funktionalität in der onkologischen Datenerfassung noch nicht erreicht worden. Obwohl zahlreiche Klassifizierungssysteme nutzbar sind, Vereinheitlichungen zur Basisdokumentation durchgeführt wurden und ein Krebsregistergesetz verabschiedet wurde, ist eine zur Perinatalerhebung äquivalente Organisationsstruktur noch nicht vorhanden. Hier sind nicht so sehr im Bereich der technischen Möglichkeiten, sondern besonders im Bereich der Gesundheitspolitik einschließlich der Finanzierungskonzepte eine Vielzahl von Lösungen zu suchen. Für die Qualitätssicherung in der gynäkologischen Onkologie ist eine einheitliche, zentral auswertbare Datenerhebung unerlässlich. Diese ist ohne moderne Werkzeuge der Informationstechnologie nicht realisierbar.
    Type of Medium: Electronic Resource
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