Chronic effects of nonpolar narcotics on a model microbial community

摘要: The dynamics of a model microbial batch culture community consisting Tetrahymena pyriformis and Escherichia coli populations are explored when the is stressed by chemicals with nonpolar narcosis mode action. framework for consists two individual-based population models, individual models organisms T. E. coli, exposure effect modules each species. module based on passive diffusion describes both environmental resource routes exposure. utilizes quantitative structure–activity relationships to determine uptake reduction, chosen as primary consequence chemical. range possible effects ciliate–bacterial includes results that do not arise from studies; example, chemically depressed growth rates individuals can be stimulatory in setting. Community structure feedback mechanisms demonstrated fundamental determination evolves function concentration. In closed system, presence nonviable organic material modifies bioavailability toxicant allows persistence above concentration levels cause mortality continuous culture. An indicator stress, extinction threshold, developed chemical diffusivity hydrophobicity.