title: Streptomyces sp. 173, an insecticidal micro-organism from marine.
abstract: OBJECTIVE
  To find new insecticidal antibiotics from marine micro-organisms.
  
  
  RESULTS
  Strains isolated from seawater and sea sediments from Beidiahe and Dagang of the east coast of China were screened for their insecticidal qualities. The screening was carried out using bioassay of brine shrimp and the insect pest Helicoverpa armigera. The fermentation, preliminary extraction and isolation of Streptomyces sp.173 were carried out.
  
  
  CONCLUSIONS
  In total 331 isolates were examined through bioassay of brine shrimp and 40 isolates (12.08%) showed potential insecticidal activities. Of the 40 isolates, one isolate, designated Streptomyces sp.173, was found to have strong insecticidal activity against both brine shrimp and H. armigera, similar to that of avermectin B1.
  
  
  CONCLUSIONS
  The isolated Streptomyces sp.173 has great insecticidal potency. This work indicated that marine micro-organisms could be an important source of insecticidal antibiotics and the improved anti-brine shrimp bioassay is suitable for primary screening.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: L
authors.initials: L
authors.lastname: Xiong
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: F
authors.initials: F
authors.lastname: Kong
mesh_terms: D000818:Animals; D001156:Artemia / Q000382:microbiology; D001681:Biological Assay; D019015:Geologic Sediments / Q000382:microbiology; D007306:Insecticides / Q000032:analysis* / Q000378:metabolism / Q000494:pharmacology; D007559:Ivermectin / Q000031:analogs & derivatives* / Q000494:pharmacology; D009036:Moths / Q000382:microbiology; D010572:Pest Control, Biological / Q000379:methods*; D012623:Seawater / Q000382:microbiology*; D013302:Streptomyces / Q000302:isolation & purification* / Q000378:metabolism*; D014871:Water Microbiology
chemical_list: D007306:Insecticides; C048324:abamectin; D007559:Ivermectin