Nutrient Agar plate for sale

growth surfaces of cells of Escherichia coli on a membrane filter placed on a nutrient agar plate under various conditions was analyzed using a mathematical model. The growth of the bacterial surface cells showed a S-shaped curve with time on a semi-logarithmic plot. To describe it is a new model of logistics that we previously (H. Fujikawa et al, Food Microbiol 21: 501-509 .. 2004) was amended. The growth curves at different constant temperatures (10-34 degrees C) were successfully described by the modified model (model III). Model III gave better rate constant predictions of growth and the lag phase, as a modified Gompertz model and Baranyi model. With the help of the values ​​of model parameters III at constant temperatures, the growth of the surface at different temperatures was predicted successfully. The surface growth curves at different numbers of initial cells were also sigmoid and converges the same maximum number of cells in stationary phase. Surface growth curves at different levels of nutrients are also sigmoid. reduces the maximum number of cells and the rate below the nutritional value growth. The surface growth curve was the same as in a liquid, with the exception of the greater curvature of the delay period. These curves were also well described by the model III. The diagram of the increased growth of ATP content on a cell surface was sigmoid like. For cell growth We discovered several properties of the growth of the bacterial cell surface under different growth conditions and examines the applicability of our model to describe the growth curves.