Production of oxytetracycline by an isolated strain of Streptomyces rimosus from Iranian soil was investigated using a special fermentation medium. A comparative study was performed with standard strain PTCC 1144 using the following parameters optimum growth conditions with respect to time, pH, and different amounts of corn steep liquor. Surprisingly, the production yield of the wild strai...

in this paper, the accumulative channel-die compression bounding (accb) method is investigated as a new method of severe plastic deformation to produce nano-crystalline bulk metals on the basis of pressing in a channel mold. aluminum as one of the most usable metal in industry is processed using this method. analyzing the processed samples show that after four passes of accb method, the ultimat...

vanillin is undoubtedly one of the most popular and widely used flavoring agents in the world. natural vanillin is extracted from vanilla beans and is relatively expensive. moreover, the consumer demand for natural vanillin highly exceeds the amount of vanillin extracted by plant sources. this had led to the investigation of alternative routes for its production such as microbial bioconversion....

background: the aim of this study was dna extraction from protosco-lecses of echinococcus granulosus and identification of these strains in west- azerbaijan province, north western iran. methods: thirty one livestock isolates from sheep and cattle were collected from abattoirs of the province. to investigate the genetic variation of the isolates, after dna extraction by glass beads-phenol chlor...

Finite strain and vorticity analyses were carried out in the deformed conglomerate and micro-conglomerate of Goushti shear zone in the Sanandaj-Sirjan metamorphic belt (Zagros Mountains Iran). These deformed rocks are bounded between two NE and SW major thrust faults. Finite strain measurements on three principal planes of strain ellipsoid show the higher amounts of strain ratios near the major...

production of oxytetracycline by an isolated strain of streptomyces rimosus from iranian soil was investigated using a special fermentation medium. a comparative study was performed with standard strain ptcc 1144 using the following parameters optimum growth conditions with respect to time, ph, and different amounts of corn steep liquor. surprisingly, the production yield of the wild strain was...

Experiments were carried out in which the dependence of the fractional softening on temperature, time and strain rate was determined in a 304H stainless steel. Three prestrain ranges were identified pertaining to three different post-deformation softening behaviors: 1) prestraining to below the DRX critical strain: strongly strain dependent softening by SRX alone with softening kinetics control...