title: [Structural modification of environment by microorganisms: formation of Liesegang rings around Dictyostelium discoideum population].
abstract: The results of the experimental study of the environment modification--the emergence of Liesegang rings around a Dictyostelium discoideum population are presented. The formation of Liesegang rings induced by D. discoideum cells is observed on addition of glucose into the semi-solid nutrient medium (agar concentration 0.5-1.5%). We show that the emergence of Liesegang rings is attended with a redistribution of folic acid in the nutrient substrate. A pH decrease in the course of D. discoideum cultivation is shown to be a factor inducing the redistribution of folic acid. The mechanisms of structural modification of the D. discoideum environment are discussed.
authors.affiliation: Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Kravchenko
authors.forename: A B
authors.initials: AB
authors.lastname: Medvinskiĭ
authors.forename: V I
authors.initials: VI
authors.lastname: Emel'ianenko
authors.forename: A N
authors.initials: AN
authors.lastname: Reshetilov
authors.forename: G R
authors.initials: GR
authors.lastname: Ivanitskiĭ
mesh_terms: D000362:Agar; D000818:Animals; D003470:Culture Media / Q000737:chemistry; D004023:Dictyostelium / Q000502:physiology*; D004777:Environment; D005492:Folic Acid / Q000032:analysis; D005947:Glucose; D006863:Hydrogen-Ion Concentration; D013997:Time Factors
chemical_list: D003470:Culture Media; D000362:Agar; D005492:Folic Acid; D005947:Glucose