A cecropin-like peptide, papiliocin, isolated from the swallowtail butterfly Papilio xuthus, possesses high selectivity against gram-negative bacteria. Since Trp(2) and Phe(5) are highly conserved residues in cecropin-like peptides, we investigated the role of Trp(2) and Phe(5) in antibacterial activity. Substitution of Trp(2) and Phe(5) in papiliocin with Ala (papiliocin-2A and papiliocin-5A) ...

The essential oil of Verbena officinalis growing in Iran was extracted using hydro-distillation method and the antibacterial and antioxidant activities were evaluated. The antibacterial activity of the essential oil against a Gram-positive (S. aureus ATCC25923) and Gram negative (E. coli ATCC 25922) were examined. The results obtained revealed that the essential oil exhibited variable levels of...

A series of 3-Amantadinyl-2-[(4-amino-3-aryl-5-ylthio)-1,2,4-triazolo]methyl)quinazolin-4-one 5(a-i) were prepared by the reaction of 3-Amantadinyl-2-[(4-acetamido-3-aryl-5-ylthio)-1,2,4-triazolo]methyl)quinazolin-4-one 4(a-i) with various 3-aryl-4-acetamido-5-mercapto triazoles. The compounds 5(a-i) biologically evaluated for their antiinflammatory and antibacterial activities.Structures of th...

The antibacterial activities of cobalt(II) complexes with two series of benzimidazoles were evaluated in vitro against three Gram-positive bacterial strains (Bacillus cereus, Staphylococcus aureus, and Sarcina lutea) and one Gram-negative isolate (Pseudomonas aeruginosa). The minimum inhibitory concentration was determined for all the complexes. The majority of the investtigated complexes displ...

The antibacterial activities of twenty six extracts from ten selected plants used in traditional Australian Aboriginal medicines have been investigated. The extracts were tested for growth inhibition of broth cultures of four gram-positive bacteria (S. Aureus, MRSA, B. subtilis and M. luteus), two gram-negative bacteria ( S. typhimurium and E. coli) bacteria and yeast (C. albicans). Twenty thre...

Plant essential oils are widely used as fragrances and flavours in the cosmetic, perfume, drug and food industries. Oxygenated monoterpenes are widespread components of the essential oils, usually occurring in high amount. In this paper, the antibacterial activities of twenty-one oxygenated monoterpenes (borneol, borneol acetate, camphor, carvone, 1,8-cineole, citronellal, beta-citronellol, dih...

Titanium (Ti) and its alloys have been widely used in clinics for years. However, their bio-inert surface challenges application in patients with compromised surgical conditions. Numerous studies were conducted to modify the surface topography and chemical composition of Ti substrates, for the purpose of obtaining antibacterial, angiogenic, and osteogenic activities. In this study, using green ...

Compared to studies of water extracts of plants, those utilising alkaline extracts are limited. Both water and alkaline extracts from licorice root were compared regarding their biological activities. Licorice root was successively extracted first with water or alkaline solution (pH 9 or 12), and the alkaline (pH 12.0) extract was further separated into 50% ethanol-soluble and -insoluble fracti...

Growing antimicrobial resistance is considered a potential threat for human health security by health organizations, such as the WHO, CDC and FDA, pointing to MRSA as an example. New antibacterial drugs and complex derivatives are needed to combat the development of bacterial resistance. Six new copper and cobalt complexes of azole derivatives were synthesized and isolated as air-stable solids ...

Seven new macrolactins (named G~M) and known macrolactins A and F were isolated from a culture broth of Bacillus sp. PP19-H3. The strain had been isolated from the macroalga, Schizymenia dubyi. Macrolactin A, which was 24-membered lactone, had previously been reported to show antibacterial, cytotoxic and antiviral activities. The new macrolactins include 22-membered ring or dicyclic lactone in ...