the streptomycetes are gram positive bacteria with a filamentous form that present in a wide variety of soil including composts, water and plants. the most characteristic of streptomycetes is the ability to produce secondary metabolites such as antibiotics. they produce over two-thirds of the clinically useful antibiotics of natural origin (e.g., neomycin and chloramphenicol. another characteri...

produced by mutants of Streptomyces peucetius^ , the daunorubicin2) producing microorganism, led to the discovery of doxorubicin (adriamycin)3) and other new anthracyclines4~8). By further mutagenic treatment of Streptomyces peucetius var. aureus, sl mutant of Streptomyces peucetius producing 4Odemethyl1 1 deoxydoxorubicin and analogues7), we have recently isolated other new mutant strains. Amo...

Background and Purpose: Cutaneous infections arise from a homogeneous group of keratinophilic fungi, known as dermatophytes. Since these pathogenic dermatophytes are eukaryotes in nature, use of chemical antifungal agents for treatment may affect the host tissue cells. In this study, we aimed to evaluate the antifungal activity of Actinomyces species against Trichophyton mentagrophytes (abbrevi...

Protoplast fusion was investigated as a technique for genetically manipulating two lignin-degrading Streptomyces strains, Streptomyces viridosporus T7A and Streptomyces setonii 75Vi2. Four of 19 recombinants tested showed enhanced production of acid-precipitable polymeric lignin (APPL), producing 155 to 264% more APPL from corn stover lignocellulose than was produced by the wild-type S. viridos...

Mangroves are the tidal forest existing in the intertidal zone and usually considered as the special marine ecosystem. In the present study, 452 actinomycetes were recovered from nine diferent sites at Maowei Sea Mangrove Reserve in Qinzhou (Guangxi province, China). Among them, Seventy-four strains were purified for 16s RNA gene sequencing and further characterization. The results indicated th...

Mangroves are the tidal forest existing in the intertidal zone and usually considered as the special marine ecosystem. In the present study, 452 actinomycetes were recovered from nine diferent sites at Maowei Sea Mangrove Reserve in Qinzhou (Guangxi province, China). Among them, Seventy-four strains were purified for 16s RNA gene sequencing and further characterization. The results indicated th...

Through microarray analysis of an antibiotic-downregulator-deleted Streptomyces coelicolor ΔwblA ΔSCO1712 mutant, 28 wblA- and SCO1712-dependent genes were identified and characterized. Among 14 wblA- and SCO1712-independent genes, a carbon flux regulating 6-phosphofructokinase SCO5426 was additionally disrupted in the ΔwblA ΔSCO1712 mutant and further stimulated actinorhodin production in S. c...

background and objectives: in the present study, isolation of streptomyces associated with marine sponges and its bioactive potential against fish and shellfish pathogens were assessed. the streptomyces sp. were isolated from the marine sponges namely callyspongia diffusa, mycale mytilorum, tedania anhelans and dysidea fragilis collected from vizhinjam port, situated in the south-west coast of ...

this is the first report about adverse inhibitory effect of v-guard and e-guard gasoline additives against soil beneficial streptomyces. v-guard and e-guard gasoline additives are anti valve seat recession agents used in unleaded gas for old car engines in iran. they contaminate soil and groundwater by fuel leaks and spills. streptomyces are of the major contributors to the biological buffering...

Extreme ecosystems can be a source of untapped micro-organisms able to produce novel bioactive compounds of industrial interest. Consequently, in this work, 32 Actinomycetes were isolated from 6 soil samples collected from Algerian Sahara in searching for untapped producers of novel antimicrobial compounds. All the isolates were further subjected to antimicrobial screening against pathogenic ba...