Mangrove sediments host rich assemblages of microorganisms, predominantly mixed bacterial cultures, which can be efficiently used for biohydrogen production through anaerobic dark fermentation. The influence of process parameters such as effect of initial glucose concentration, initial medium pH, and trace metal (Fe(2+)) concentration was investigated in this study. A maximum hydrogen yield of ...

Gellan gum production was carried out by Sphingomonas paucimobilis ATCC 31461 in a simplified medium with a short incubation time, and a kinetic model for understanding, controlling, and optimizing the fermentation process was proposed. The results revealed that glucose was the best carbon source and that the optimal concentration was 30 g liter(-1). As for the fermenting parameters, considerab...

The influence of aeration on algal growth and gamma-linolenic acid (GLA) production in a bubble column photobioreactor was investigated. Studies were performed in a 20-L reactor at different aeration rates (0.2- 2.5 vvm). Static, continuous, and periodic operation of air resulted in 41.9%, 88.4%, and 108% air saturation of dissolved oxygen, for which the corresponding values of GLA were 2.3, 6....

The development of optimal bacterial strains for industrial scale of fermentation would benefit from a quantitative model of rate of gene expression from DNA to RNA, from DNA to protein, and ultimately from DNA to the metabolites. In this study, we developed such a model for phenazine-1-carboxylic acid (PCA) biosynthesis in Pseudomonas sp. strain M18G. The PCA biosynthesis is controlled by anop...

The effect of temperatures ranging from 15 to 35 degrees C on a culture of Brettanomyces bruxellensis was investigated in regards to thermodynamics, metabolism, and kinetics. In this temperature range, we observed an increase in growth and production rates. The growth behavior was well represented using the Arrhenius model, and an apparent activation energy of 16.61 kcal/mol was estimated. A st...

Tannase (tannin acyl hydrolase, E.C.3.1.1.20) is an important hydrolysable enzyme with innumerable applications and industrial potential. In the present study, a kinetic model has been developed for the batch fermentation used for the production of tannase by A.flavus MTCC 3783. Maximum tannase activity of 143.30 U/ml was obtained at 96 hours under optimum operating conditions at 35oC, an initi...

Biosurfactants are microbial substances which influence interfacial tension. The kinetic study was carried out for Pseudomonas aeruginosa MR01 during biosurfactant production in a two-phase liquid-liquid batch fermentation system. The maximum rhamnolipid concentration (P ) and the yield of biosurfactant per max biomass (Y ) in a 5-L bioreactor containing soybean oil medium were found to be appr...

Abstract Aspergillus niger B60 was screened for the first time toward extracellular tannase and gallic acid production by submerged fermentation using synthetic media supplemented with tannic as sole carbon source at a wide concentration range (5–150 g/L). Maximum (47 IU/mL) (36 g/L) obtained initial 100 g/L. For this study, it of interest to valorize non-sterile table olive processing wastewat...

In this study, we employed microwave-acid pretreatment for water hyacinth (WH) to obtain liquid hydrolysate that contains sugars derived from holocellulosic components of biomass further oleaginous yeast fermentation. order remove the inhibitors such as furans after acid treatment, detoxification was done and compared efficiency step with non-detoxified towards capability Rhodosporidium toruloi...

Skolpap, W., Scharer, J.M., Douglas, P.L. and Moo-Young, M. Optimal feed rate profiles for fed-batch culture in penicillin production Songklanakarin J. Sci. Technol., 2005, 27(5) : 1057-1064 The fed-batch optimization of penicillin productivity was applied as an example of optimization algorithm verification. The objective function of this problem was to optimize penicillin productivity by dete...