title: Effect of crude extracts of selected actinomycetes on biofilm formation of A. schindleri, M. aci, and B. cereus.
abstract: Actinomycetes are well known group of gram positive bacteria for their potential to produce antibiotics. This study sought to assess the ability of the selected actinomycetes to control biofilm forming bacteria isolated from different dental plaque samples. On the basis of morphological differences three out of ten different dental plaque bacterial isolates were selected for further study. These isolates were biochemically and genetically characterized and were identified as Acinetobacter schinndleri, Moraxella aci, and Bacillus cereus. Antibiotic resistant profile was measured through disc diffusion method and found that all three isolates were moderately sensitive to ofloxacin and erythromycin and resistant to trimethoprim. Antibacterial activity of ten different Streptomyces strains was assessed through an agar plug and well diffusion method against three dental biofilm forming bacteria. Two Streptomyces strains named as S. erythrogriseus and S. labedae showed good antibacterial activity against Moraxella and Acinetobacter strains. Ability of the four active antibiotic producing strains to inhibit biofilm formation was assessed using microtiter biofilm detection assay. It was found that biofilm forming ability of Acinetobacter and Moraxella was inhibited by S. labedae an antibiotic producing strain, while S. macrosporeus can only inhibit biofilm formation by B. cereus.
authors.affiliation: Department of Microbiology & Molecular Genetics (MMG), University of the Punjab Quaid-e-Azam Campus, Lahore, Pakistan.
authors.forename: Hafiz Ghulam Murtaza
authors.initials: HG
authors.lastname: Saleem
authors.forename: Usman
authors.initials: U
authors.lastname: Aftab
authors.forename: Imran
authors.initials: I
authors.lastname: Sajid
authors.forename: Zaigham
authors.initials: Z
authors.lastname: Abbas
authors.forename: Anjum Nasim
authors.initials: AN
authors.lastname: Sabri
mesh_terms: D000150:Acinetobacter / Q000145:classification / Q000187:drug effects* / Q000302:isolation & purification / Q000502:physiology; D000900:Anti-Bacterial Agents / Q000302:isolation & purification / Q000494:pharmacology*; D001407:Bacillus / Q000145:classification / Q000187:drug effects* / Q000302:isolation & purification / Q000502:physiology; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D045424:Complex Mixtures / Q000302:isolation & purification / Q000494:pharmacology; D003773:Dental Plaque / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D009016:Moraxella / Q000145:classification / Q000187:drug effects* / Q000302:isolation & purification / Q000502:physiology; D013302:Streptomyces / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D045424:Complex Mixtures
keywords: Actinomycetes; Biofilm; Dental plaque; Disc diffusion; Well diffusion