نتایج جستجو برای ' Fermentation '

 With significant growth of biodiesel industry in past few years, very large quantities of crude glycerol are available as side product of transesterification process. Effective conversion of glycerol to value added products can boost economy of biodiesel industry. The present study attempts to investigate ultrasound assisted bioconversion of glycerol to 1,3-propanediol (1,3-PDO) and ethanol (EtOH) from mechanistic viewpoint. A dual approach of coupling experiments under ultrasound irradiat...

 Polyhydroxyalkanoate (PHA) was produced in bench-scale sequencing batch reactors (SBRs) fed olive pomace fermentate containing a mixed microbial consortium. Initial anaerobic fermentation in a sequencing batch fermentor (SBF) produced soluble carbon compounds, mainly organic acids. SBF effluent was centrifuged, removing solids, and fed into a SBR where intracellular PHA was produced. Buffer pre-treatment of diluted olive pomace increased organic acid production 75% in SBF fermentate over n...

 From the distillation process after butanol fermentation, wastewaters mainly consisted of organic acids and residual sugars and with high COD (usually >20,000 mg/L) are generated. Without any pretreatment and adding other nutrients (nitrogen sources and trace elements), these wastewaters were used as substrate for microbial oil production by oleaginous yeast Trichosporon coremiiforme. After 5 days’ lipid fermentation, all the sugars and organic acids measured were t...

 A fungus strain producing microbial oils utilizing pretreated rice straw was isolated from soil. This strain was identified as Mortierella elongata PFY based on the morphology and internal transcribed spacer sequence. Using pretreated rice straw as substrate, the average yield of total lipids was 7.07% after 7 days fermentation. The GC–MS detection demonstrated that the lipids were composed of saturated fatty acids and polyunsaturated fatty acids. This work presents on...

 The purpose of this work was to study the possible use of pretreated biomass of various microalgae and cyanobacteria as substrates for acetone–butanol–ethanol (ABE) fermentation by Clostridium acetobutylicum cells immobilized into poly(vinyl alcohol) cryogel. To this end, the biochemical composition of photosynthetic microorganisms cultivated under various conditions was studied. The most efficient technique for pretreating microalgal biomass for its subsequent conver...

 Cofactor engineering was employed to enhance production of acetoin by Serratia marcescens H32. 2,3-Butanediol was a major byproduct of acetoin fermentation by S. marcescens H32. In order to decrease 2,3-butanediol formation and achieve a high efficiency of acetoin production, nox gene encoding a water-forming NADH oxidase fromLactobacillus brevis was expressed. Batch fermentations suggested the expression of the NADH oxidase could increase the intracellul...

 Duckweed (Lemna minor) was grown in swine lagoon wastewater and Schenk & Hildebrandt medium with a growth rate of 3.5 and14.1 g m−2 day−1 (dry basis), respectively detected. The rapid accumulation of starch in duckweed biomass (10–36%, w/w) was triggered by nutrient starvation or growing in dark with addition of glucose. The harvested duckweed biomass (from culture in wastewater) contained 20.3% (w/w) total glucan, 32.3% (w/w) proteins, trace hemic...

 Soy peptone (SP) was studied as nutrient source in replacement of the conventional media as Brain–Heart Infusion (BHI) and sheep blood in the first seed culture medium in Petri plates of Streptococcus zooepidemicus. This substitution, aimed at meeting the claim of the pharmaceutical and cosmetics industries, for the removal of animal sources of the culture media used in obtaining their products for safety reasons. The animal sources were used as a control. The effects of this su...

 Phytase production by Aspergillus niger F3 by solid state fermentation (SSF) on citrus peel was evaluated at pilot scale under different aeration conditions. The best airflow intensity was 1 VkgM (Lair kg medium−1 min−1), which allowed to produce 65 units of phytases per gram in dry basis (65 Ug−1 d.b.) as it removed the metabolic heat generated by the microorganism, Agitation did not improve heat removal. Airflow intensity was cons...

 A current challenge of the cellulosic ethanol industry is to improve the resistance of inhibitors present in biomass hydrolysates. RNA-binding protein gene lsm6 was cloned from industrial Saccharomyces cerevisiae ZU-E8, which is able to conferment glucose and xylose, and transformed into ZU-E8 via expression vector pRS426. The positive transformant ZU-910 with over-expressing lsm6 was identified on the culture plates using high concentration of acetate and re-screened by fermenta...