The stability of an emulsified liquid membrane composed of Span80 as a surfactant, D2EHPA as an extractant and sulfuric acid as an internal phase was first studied according to different diluents and many operating parameters using the Plackett-Burman design of experiments. Then the removal of methylene blue from an aqueous solution has been carried out using this emulsified liquid membrane at ...

Selenium (Se) as a vital trace element has many biological activities such as anti-inflammation and anti-oxidation. Selenomethionine as an organic selenium plays a vital role in the response to oxidative stress. At present, Saccharomyces cerevisiae is one of the best microorganisms that has the ability to accumulate selenium. Production of Seleno-yeast was done by growing Saccharomyces cerevisi...

Selenium (Se) as a vital trace element has many biological activities such as anti-inflammation and anti-oxidation. Selenomethionine as an organic selenium plays a vital role in the response to oxidative stress. At present, Saccharomyces cerevisiae is one of the best microorganisms that has the ability to accumulate selenium. Production of Seleno-yeast was done by growing Saccharomyces cerevisi...

Cellulases are a complex of enzymes necessary for the complete solubilization cellulose in sugars, thus playing key role natural carbon cycle through hydrolysis lignocellulosic structures. The aim this study was to evaluate increase capacity Talaromyces amestolkiae CMIAT 055 produce cellulases by optimizing components culture medium containing banana pseudostem as an inducer, well different agi...

Various cultivation parameters were optimized for the production of extra cellular protease by Brevibacterium linens DSM 20158 grown in solid state fermentation conditions using statistical approach. The cultivation variables were screened by the Plackett-Burman design and four significant variables (soybean meal, wheat bran, (NH4)2SO4 and inoculum size were further optimized via central compos...

Response surface methodology was used to enhance the production of α-galactosidase from Fusarium moniliforme NCIM 1099 in solid-state fermentation. Plackett-Burman design was employed for selection of critical media constituents which were optimized by central composite rotatable design. Wheat bran, peptone and FeSO4·7H2O were identified as significant medium components using PB design. Further...

Poly[(R)-3-hydroxyalkanoic acids] [poly(HAs)] are a class of bacterial storage compounds that are synthesized during unbalanced growth by many Gram-negative and Gram-positive bacteria. Poly(HAs) are deposited intracellularly in the form of inclusions bodies (granules) to levels up to 90% of the cellular dry weight (Jendrossek, 2001; Jendrossek et al., 1996; Steinbüchel and Hein, 2001). In the l...

This paper analyses the influence of 13 stylized facts of the German economy on the West German business cycles from 1955 to 1994. The method used in this investigation is Statistical Experimental Design with orthogonal factors. We are looking for all existing Plackett-Burman designs realizable by coded observations of these data. The plans are then analysed by regression with forward selection...