bacterialphysiologicalphenomena biologicalmodels biologicalsystems biometry chemostat communicablediseases epidemiology geneticaspects hostplants mathematicalmodels mathematischesmodell methods microbialgenetics microbialgrowth microbiologicalprocesses microbiology mikrobielleswachstum models pathogenicmicroorganisms phytopathogenicmicroorganisms plantdiseases qw52m62831982 theoretical