background:pneumonia and respiratory tract infections, is associated with high mortality and complications in humans. current antibiotics are used to treat this infectious disease, but may lead to many problems such as unwanted side effects and resistance to antibiotics. this study investigated the antibacterial activity of the hydro alcoholic extracts of the native medicinal plants peganum har...

Synthetic hormones and bioactive substances (vitamins, pigments and isoflavons) which have been used in the feed industry are accumulated in milk, meat and eggs. It is suspected that these are responsible for a number of side-effects such as carcinogenesis, liver and kidney damage, allergies in consumers. Furthermore the synthetic hormones, vitamins, pigments are less active than those extracte...

In this work the structural requirements of both urea and thiourea derivatives were evaluated for optimal antibacterial activity on Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli, using several organic compounds (VI-X) as chemical tools. In order to delineate the structural chemical requirements of studied compounds, the descriptors Log P, π MR and MV were calculated. The res...

The exploration of habitats with unusual environment and poorly explored areas such as Antarctica is one of the strategies for discovery of new biologically active substances and/or new producers. The aim of this study was to identify the actinomycetes isolated from the soils of the island Livingston - Antarctica and to investigate their potential to synthesize antibacterial agents against phyt...

Natural products was the source of many important biological activities against human and animal pathogens. Propolis one these substances, produced by bees from resins wax. In this study, D-optimal experimental design used to optimize operational condition propolis extraction, then phenolic compounds extracted seven regions Bejaia identified quantified HPLC analysis. Also, their evaluated, incl...

Of the bacterial antagonists thus far known to be produced by microorganisms, the most effective in bactericidal action against Brucella abortus is the culture filtrate from a strain of Penicillium notatum (Kocholaty, 1942). Another antibacterial substance, penicillin, also obtained from a culture of a strain of Penicillium notatum, but with very little potency against Brucella abortus, has bee...

two strains, hg104 and asso, were isolated crom the soil of tehran's suburbs. taxonomic studies showed thathg104 and as50 belong to mycobacterium spp. and brevibacterium spp. respectively, which produce antibacterial substances with relatively high activity against some important clinical gram-positive and gramnegative bacteria