title: Surface colony growth in a controlled nutrient environment. 1 The exponential law.
abstract: An apparatus designed to study the growth rates of surface colonies in constant conditions, i.e. not affected by nutrient diffusion as in a closed Petri dish, is described. In contrast to classical experiments in closed systems, an exponential growth of colony radius is obtained for a period of more than 72 h. Nutrient concentration gradients are shown to be eliminated by analytical techniques.
mesh_terms: D002455:Cell Division; D003470:Culture Media; D004058:Diffusion; D004777:Environment; D012441:Saccharomyces cerevisiae / Q000254:growth & development*
chemical_list: D003470:Culture Media