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Serpil Ozmihci - One of the best experts on this subject based on the ideXlab platform.
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effect of Initial bacteria Concentration on hydrogen gas production from cheese whey powder solution by thermophilic dark fermentation
Biotechnology Progress, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Dark fermentative hydrogen gas production from cheese whey powder solution was realized at 55°C. Experiments were performed at different Initial biomass Concentrations varying between 0.48 and 2.86 g L−1 with a constant Initial Substrate Concentration of 26 ± 2 g total sugar (TS) per liter. The highest cumulative hydrogen evolution (633 mL, 30°C), hydrogen yield (1.56 mol H2 mol−1 glucose), and H2 formation rate (3.45 mL h−1) were obtained with 1.92 g L−1 biomass Concentration. The specific H2 production rate decreased with increasing biomasss Concentration from the highest value (47.7 mL g−1 h−1) at 0.48 g L−1 biomass Concentration. Total volatile fatty acid Concentration varied beetween 10 and 14 g L−1 with the highest level of 14.2 g L−1 at biomass Concentration of 0.48 g L−1 and Initial TS content of 28.4 g L−1. The experimental data were correlated with the Gompertz equation and the constants were determined. The most suitable Initial biomass to Substrate ratio yielding the highest H2 yield and formation rate was 0.082 g biomass per gram of TS. © 2012 American Institute of Chemical Engineers Biotechnol. Prog., 28: 931–936, 2012
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hydrogen gas production from cheese whey powder cwp solution by thermophilic dark fermentation
International Journal of Hydrogen Energy, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Abstract Hydrogen gas production from cheese whey powder (CWP) solution by thermophilic dark fermentation was investigated at 55 °C. Experiments were performed at different Initial total sugar Concentrations varying between 5.2 and 28.5 g L−1 with a constant Initial bacteria Concentration of 1 g L−1. The highest cumulative hydrogen evolution (257 mL) was obtained with 20 g L−1 total sugar (Substrate) Concentration within 360 h while the highest H2 formation rate (2.55 mL h−1) and yield (1.03 mol H2 mol−1 glucose) were obtained at 5.2 and 9.5 g L−1 Substrate Concentrations, respectively. The specific H2 production rate (SHPR = 4.5 mL h−1 g−1cells) reached the highest level at 20 g L−1 total sugar Concentration. Total volatile fatty acid (TVFA) Concentration increased with increasing Initial total sugar content and reached the highest level (14.15 g L−1) at 28.5 g L−1 Initial Substrate Concentration. The experimental data was correlated with the Gompertz equation and the constants were determined. The optimum Initial total sugar Concentration was 20 g L−1 above which Substrate and product (VFA) inhibitions were observed.
Luciana Rocha Barros Goncalves - One of the best experts on this subject based on the ideXlab platform.
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mathematical modeling of the ethanol fermentation of cashew apple juice by a flocculent yeast the effect of Initial Substrate Concentration and temperature
Bioprocess and Biosystems Engineering, 2017Co-Authors: Alvaro Daniel Teles Pinheiro, A S Pereira, Emanuel Meneses Barros, Sandra Regina Ceccato Antonini, Samuel J M Cartaxo, Maria Valderez Ponte Rocha, Luciana Rocha Barros GoncalvesAbstract:In this work, the effect of Initial sugar Concentration and temperature on the production of ethanol by Saccharomyces cerevisiae CCA008, a flocculent yeast, using cashew apple juice in a 1L-bioreactor was studied. The experimental results were used to develop a kinetic model relating biomass, ethanol production and total reducing sugar consumption. Monod, Andrews, Levenspiel and Ghose and Tyagi models were investigated to represent the specific growth rate without inhibition, with inhibition by Substrate and with inhibition by product, respectively. Model validation was performed using a new set of experimental data obtained at 34 °C and using 100 g L-1 of Initial Substrate Concentration. The model proposed by Ghose and Tyagi was able to accurately describe the dynamics of ethanol production by S. cerevisiae CCA008 growing on cashew apple juice, containing an Initial reducing sugar Concentration ranging from 70 to 170 g L-1 and temperature, from 26 to 42 °C. The model optimization was also accomplished based on the following parameters: percentage volume of ethanol per volume of solution (%V ethanol/V solution), efficiency and reaction productivity. The optimal operational conditions were determined using response surface graphs constructed with simulated data, reaching an efficiency and a productivity of 93.5% and 5.45 g L-1 h-1, respectively.
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kinetic study of biosurfactant production by bacillus subtilis lami005 grown in clarified cashew apple juice
Colloids and Surfaces B: Biointerfaces, 2013Co-Authors: Darlane Wellen Freitas De Oliveira, Italo Waldimiro Lima De Franca, Anne Kamilly Nogueira Felix, Joao Jeferson Lima Martins, Maria Estela Aparecida Giro, Vânia Maria Maciel Melo, Luciana Rocha Barros GoncalvesAbstract:Abstract In this work a low cost medium for the production of a biosurfactant by Bacillus subtilis LAMI005 and the kinetics of surfactin production considering the effect of Initial Substrate Concentration were investigated. First, cashew apple juice supplementation for optimal production of biosurfactant by B. subtilis LAMI005 was studied. The medium formulated with clarified cashew apple juice and distilled water, supplemented with 1.0 g/L of (NH 4 ) 2 SO 4 , proved to be the best among the nutrients evaluated. The crude biosurfactant had the ability to decrease the surface tension of water to 30 dyne/cm, with a critical micelle Concentration (CMC) of 63.0 mg/L. Emulsification experiments indicated that this biosurfactant effectively emulsified kerosene (IE 24 = 67%) and soybean oil (IE 24 = 64%). Furthermore, the emulsion stability was always very high. It was shown by biochemical analysis, IR spectra, that there is no qualitative differences in the composition of the crude biosurfactant from a standard sample of surfactin from B. subtilis .
Fikret Kargi - One of the best experts on this subject based on the ideXlab platform.
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effect of Initial bacteria Concentration on hydrogen gas production from cheese whey powder solution by thermophilic dark fermentation
Biotechnology Progress, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Dark fermentative hydrogen gas production from cheese whey powder solution was realized at 55°C. Experiments were performed at different Initial biomass Concentrations varying between 0.48 and 2.86 g L−1 with a constant Initial Substrate Concentration of 26 ± 2 g total sugar (TS) per liter. The highest cumulative hydrogen evolution (633 mL, 30°C), hydrogen yield (1.56 mol H2 mol−1 glucose), and H2 formation rate (3.45 mL h−1) were obtained with 1.92 g L−1 biomass Concentration. The specific H2 production rate decreased with increasing biomasss Concentration from the highest value (47.7 mL g−1 h−1) at 0.48 g L−1 biomass Concentration. Total volatile fatty acid Concentration varied beetween 10 and 14 g L−1 with the highest level of 14.2 g L−1 at biomass Concentration of 0.48 g L−1 and Initial TS content of 28.4 g L−1. The experimental data were correlated with the Gompertz equation and the constants were determined. The most suitable Initial biomass to Substrate ratio yielding the highest H2 yield and formation rate was 0.082 g biomass per gram of TS. © 2012 American Institute of Chemical Engineers Biotechnol. Prog., 28: 931–936, 2012
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hydrogen gas production from cheese whey powder cwp solution by thermophilic dark fermentation
International Journal of Hydrogen Energy, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Abstract Hydrogen gas production from cheese whey powder (CWP) solution by thermophilic dark fermentation was investigated at 55 °C. Experiments were performed at different Initial total sugar Concentrations varying between 5.2 and 28.5 g L−1 with a constant Initial bacteria Concentration of 1 g L−1. The highest cumulative hydrogen evolution (257 mL) was obtained with 20 g L−1 total sugar (Substrate) Concentration within 360 h while the highest H2 formation rate (2.55 mL h−1) and yield (1.03 mol H2 mol−1 glucose) were obtained at 5.2 and 9.5 g L−1 Substrate Concentrations, respectively. The specific H2 production rate (SHPR = 4.5 mL h−1 g−1cells) reached the highest level at 20 g L−1 total sugar Concentration. Total volatile fatty acid (TVFA) Concentration increased with increasing Initial total sugar content and reached the highest level (14.15 g L−1) at 28.5 g L−1 Initial Substrate Concentration. The experimental data was correlated with the Gompertz equation and the constants were determined. The optimum Initial total sugar Concentration was 20 g L−1 above which Substrate and product (VFA) inhibitions were observed.
Ryo Yoshida - One of the best experts on this subject based on the ideXlab platform.
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effect of Initial Substrate Concentration of the belousov zhabotinsky reaction on self oscillation for microgel system
Journal of Physical Chemistry B, 2008Co-Authors: Daisuke Suzuki, Ryo YoshidaAbstract:Self-oscillation for the microgel particles (∼200 nm in diameter) was studied by changing Initial Substrate Concentrations (i.e., malonic acid, sodium bromate, and nitric acid) of the Belousov−Zhabotinsky (BZ) reaction that is used for chemical energy for the self-oscillation. The cross-linked microgels are composed of N-isopropylacrylamide and ruthenium tris(2,2′-bipyridine), Ru(bpy)3, which is a catalyst for the BZ reaction. Comparing with the homogeneous, stirred solution of the bulk solution for the BZ reaction, swelling/deswelling oscillation of the microgels showed longer induction period, different dependence of Initial Substrate Concentrations on oscillation period, and different oscillation rhythm. The change in oscillation for the microgels can be understood by considering the microgel network effect.
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effect of Initial Substrate Concentration of the belousov zhabotinsky reaction on self oscillation for microgel system
Journal of Physical Chemistry B, 2008Co-Authors: Daisuke Suzuki, Ryo YoshidaAbstract:Self-oscillation for the microgel particles ( approximately 200 nm in diameter) was studied by changing Initial Substrate Concentrations (i.e., malonic acid, sodium bromate, and nitric acid) of the Belousov-Zhabotinsky (BZ) reaction that is used for chemical energy for the self-oscillation. The cross-linked microgels are composed of N-isopropylacrylamide and ruthenium tris(2,2'-bipyridine), Ru(bpy) 3, which is a catalyst for the BZ reaction. Comparing with the homogeneous, stirred solution of the bulk solution for the BZ reaction, swelling/deswelling oscillation of the microgels showed longer induction period, different dependence of Initial Substrate Concentrations on oscillation period, and different oscillation rhythm. The change in oscillation for the microgels can be understood by considering the microgel network effect.
Nur Seza Eren - One of the best experts on this subject based on the ideXlab platform.
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effect of Initial bacteria Concentration on hydrogen gas production from cheese whey powder solution by thermophilic dark fermentation
Biotechnology Progress, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Dark fermentative hydrogen gas production from cheese whey powder solution was realized at 55°C. Experiments were performed at different Initial biomass Concentrations varying between 0.48 and 2.86 g L−1 with a constant Initial Substrate Concentration of 26 ± 2 g total sugar (TS) per liter. The highest cumulative hydrogen evolution (633 mL, 30°C), hydrogen yield (1.56 mol H2 mol−1 glucose), and H2 formation rate (3.45 mL h−1) were obtained with 1.92 g L−1 biomass Concentration. The specific H2 production rate decreased with increasing biomasss Concentration from the highest value (47.7 mL g−1 h−1) at 0.48 g L−1 biomass Concentration. Total volatile fatty acid Concentration varied beetween 10 and 14 g L−1 with the highest level of 14.2 g L−1 at biomass Concentration of 0.48 g L−1 and Initial TS content of 28.4 g L−1. The experimental data were correlated with the Gompertz equation and the constants were determined. The most suitable Initial biomass to Substrate ratio yielding the highest H2 yield and formation rate was 0.082 g biomass per gram of TS. © 2012 American Institute of Chemical Engineers Biotechnol. Prog., 28: 931–936, 2012
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hydrogen gas production from cheese whey powder cwp solution by thermophilic dark fermentation
International Journal of Hydrogen Energy, 2012Co-Authors: Fikret Kargi, Nur Seza Eren, Serpil OzmihciAbstract:Abstract Hydrogen gas production from cheese whey powder (CWP) solution by thermophilic dark fermentation was investigated at 55 °C. Experiments were performed at different Initial total sugar Concentrations varying between 5.2 and 28.5 g L−1 with a constant Initial bacteria Concentration of 1 g L−1. The highest cumulative hydrogen evolution (257 mL) was obtained with 20 g L−1 total sugar (Substrate) Concentration within 360 h while the highest H2 formation rate (2.55 mL h−1) and yield (1.03 mol H2 mol−1 glucose) were obtained at 5.2 and 9.5 g L−1 Substrate Concentrations, respectively. The specific H2 production rate (SHPR = 4.5 mL h−1 g−1cells) reached the highest level at 20 g L−1 total sugar Concentration. Total volatile fatty acid (TVFA) Concentration increased with increasing Initial total sugar content and reached the highest level (14.15 g L−1) at 28.5 g L−1 Initial Substrate Concentration. The experimental data was correlated with the Gompertz equation and the constants were determined. The optimum Initial total sugar Concentration was 20 g L−1 above which Substrate and product (VFA) inhibitions were observed.