title: [Antagonistic activity of novel green microalgae strain].
abstract: OBJECTIVE
  Screening of novel microalgae strains for the presence of pronounced antagonistic (antibacterial) activity against opportunistic bacteria.
  
  
  METHODS
  11 pure cultures of green unicellular algae isolated from fresh and salt basins of Orenburg region were studied for the presence of antagonistic activity against 4 test-strains of opportunistic bacteria by a photometric method. The effect of water extracts of microalgae Astermonas gracilis on the speed of self-purification of brine from Escherichia coli as well as antibacterial activity of peloid were evaluated under co-cultivation conditions.
  
  
  RESULTS
  Pure cultures of green unicellular algae Scenedesmus obliquus (Turpin) Kütz, Scenedesmus magnus Meyen var. magnus, Pediastru duplex Meyen var. duplex, Chlorella vulgaris Bory, Monoraphidium arcuatum (Korschikov) Hindak (=Ankistrodesmus arcuatus Korschikov), Dictyosphaerium sp. had the most pronounced antagonistic activit against opportunistic bacteria. Water extract ofA. gracilis microalgae accelerated brine self-purification fro E. coli due to antibacterial effect. Peloid containing extracts of microorganism cells had a pronounced antibacterial effect against opportunistic bacteria.
  
  
  CONCLUSIONS
  Antagonistic substances localized inside cells of microalgae increased the speed of allochthonic microorganism elimination that is one of the mechanisms of self-purification of a basin and antibacterial effect of peloid. The novel green microalgae strains studied due to the presence of pronounced antagonistic activity may have a wide practical application.
authors.forename: E A
authors.initials: EA
authors.lastname: Selivanova
authors.forename: M E
authors.initials: ME
authors.lastname: Ignatenko
authors.forename: N V
authors.initials: NV
authors.lastname: Nemtseva
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D002457:Cell Extracts / Q000737:chemistry / Q000494:pharmacology*; D000460:Chlorophyta / Q000737:chemistry; D004926:Escherichia coli / Q000187:drug effects*; D058086:Microalgae; D012492:Salts / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D002457:Cell Extracts; D012492:Salts; C017082:brine