title: In-vitro antimicrobial activity of marine actinobacteria against multidrug resistance Staphylococcus aureus.
abstract: OBJECTIVE
  To investigate the antibacterial activity of marine actinobacteria against multidrug resistance Staphylococcus aureus (MDRSA).
  
  
  METHODS
  Fifty one actinobacterial strains were isolated from salt pans soil, costal area in Kothapattanam, Ongole, Andhra Pradesh. Primary screening was done using cross-streak method against MDRSA. The bioactive compounds are extracted from efficient actinobacteria using solvent extraction. The antimicrobial activity of crude and solvent extracts was performed using Kirby-Bauer method. MIC for ethyl acetate extract was determined by modified agar well diffusion method. The potent actinobacteria are identified using Nonomura key, Shirling and Gottlieb 1966 with Bergey's manual of determinative bacteriology.
  
  
  RESULTS
  Among the fifty one isolates screened for antibacterial activity, SRB25 were found efficient against MDRSA. The ethyl acetate extracts showed high inhibition against test organism. MIC test was performed with the ethyl acetate extract against MDRSA and found to be 1 000 µg/mL. The isolated actinobacteria are identified as Streptomyces sp with the help of Nonomura key.
  
  
  CONCLUSIONS
  The current investigation reveals that the marine actinobacteria from salt pan environment can be able to produce new drug molecules against drug resistant microorganisms.
authors.affiliation: Molecular and Microbiology Research Laboratory, Environmental Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore - 632 014, Tamil Nadu, India.
authors.forename: Kumar S R
authors.initials: KS
authors.lastname: Sathish
authors.forename: Venkata Bhaskara Rao
authors.initials: VB
authors.lastname: Kokati
mesh_terms: D039903:Actinobacteria / Q000737:chemistry* / Q000302:isolation & purification; D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology*; D045424:Complex Mixtures / Q000737:chemistry / Q000494:pharmacology*; D024901:Drug Resistance, Multiple, Bacterial; D019015:Geologic Sediments / Q000382:microbiology*; D008826:Microbial Sensitivity Tests; D013211:Staphylococcus aureus / Q000187:drug effects*
chemical_list: D000890:Anti-Infective Agents; D045424:Complex Mixtures
keywords: Cross streak method; Kirby-Bauer method; MIC; Marine actinobacteria; Multi drug resistance Staphylococcus aureus; Nonomura key; Salt pan