Structure of the S4 class Bac inheriting from class Organism-class representing bacterial cells.
deathrateA numeric value giving the factor by which the biomass should be reduced in every iteration if no growth is possible (default (E.coli): 0.21 pg)
minweightA numeric value giving the growth limit at which the organism dies. (default (E.coli): 0.083 pg)
cellareaA numeric value indicating the surface that one organism occupies (default (E.coli): 4.42 mu_m^2)
maxweightA numeric value giving the maximal dry weight of single organism (default (E.coli): 1.172 pg)
chemA character vector indicating name of substance which is the chemotaxis attractant. Empty character vector if no chemotaxis.