Dienes phenomenon

Dienes phenomenon, when two identical Proteus cultures are inoculated at different points on the same plate of non-inhibitory medium, the resulting swarming of growth coalesce without signs of demarcation.[1][2] When, however, two different strains of Proteus are inoculated, the spreading films of growth fail to coalesce and remain separated by a narrow easily visible area.[2] The observation of this appearance, the Dienes phenomenon has been used to determine the identity or non-identity of strains in epidemiological studies.[2][3]


  1. ^ "Essentials of Microbiology". Retrieved 28 December 2016.
  2. ^ a b c Budding, AE; Ingham, CJ; Bitter, W; Vandenbroucke-Grauls, CM; Schneeberger, PM (2009). "The Dienes phenomenon: competition and territoriality in Swarming Proteus mirabilis" (PDF). J Bacteriol. 191 (12): 3892–900. doi:10.1128/JB.00975-08. PMC 2698385. PMID 19251852.
  3. ^ "dienes phenomenon – microregistrar". Retrieved 28 December 2016.