An unstructured model for the diauxic growth of Penicillium camembertii on glucose and arginine

Amrane, Abdeltif; Adour, Lydia; Couriol, Catherine

doi:10.1016/j.bej.2005.02.009

Cited by 12 publications

(16 citation statements)

References 28 publications

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“…The growth curves of S. minima in HM and HMWW subjected to a pH control at 6.0, showed a clear diauxic growth pattern, similarly to that described for bacterial cultures (Brandt, Kelpin, van Leeuwen, & Kooijman, 2004;Kremling et al, 2001), for fungi cultures (Amrane, Adour, & Couriol, 2005;Nakamura, Sawada, & Inoue, 2001) and carrot cells (T. K. Lee, S. M. Lee, & W. S. Lee, 1999) in the presence of two carbon sources. Our hypothesis is that this type of growth in S. minima is related to the sequential use of two different intracellular nitrogen sources.…”

Section: Discussionmentioning

confidence: 50%

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

Olguín

Sánchez-Galván

Pérez-Pérez

2007

Water Air Soil Pollut

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Salvinia minima combines several advantages for being used in aquatic phytoremediation. The objectives of this work were to compare the growth kinetics and productivity of S. minima and Spirodela polyrrhiza in high-strength synthetic organic wastewater (HSWW) and to evaluate the growth characteristics of S. minima in various culture media, including anaerobic effluents from pig wastewater (PWAE). It was found that the Relative Growth Rate (RGR) of S. minima was significantly higher (p<0.05) compared to the RGR of S. polyrrhiza in Hutner Medium (HM) and in HSWW. Also, S. minima showed a 1.5 fold productivity and a 2.3 fold productivity, compared to S. polyrrhiza in HM and HSWW, respectively. Diauxic growth of S. minima was observed preferentially under pH control and there was a simultaneous consumption of two nitrogen sources. Productivity of S. minima was similar in pig waste anaerobic effluents (PWAE) and in HM without ammonium nitrate and amended with ammonium sulphate (MHM+AS), at an initial NH 4 concentration of 35 mg l −1 . Above this level, the productivity was found to decrease as the initial ammonium concentration increased, in both media. Growth was completely inhibited at 140 mg l −1 in the PWAE. In summary, S. minima is a better option than S. polyrrhiza for treating high-strength organic wastewater and lagoons should be operated at a maximum initial ammonium-nitrogen concentration of 70 mg l −1 and at a pH of 5.0 or 6.0. Likewise, the initial density should be maintained in the range of 7 to 15 g dw m −2 .

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Section: Discussionmentioning

confidence: 50%

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

Olguín

Sánchez-Galván

Pérez-Pérez

2007

Water Air Soil Pollut

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“…The fungus started to grow immediately, without a lag phase, and grew exponentially until Day 15, when an evident deceleration was observed showing the transition between the exponential and stationary growth phase. This behaviour has been commonly observed in bacterial growth (Zwietering et al, 1990), and has also been studied and modelled in fungal growth (Amrane et al, 2005;Hamidi-Esfahani et al, 2007). The biomass growth was fitted to a Gompertz sigmoid curve (Eq.…”

Section: Resultsmentioning

confidence: 96%

“…When the growth curve is shown as the logarithm of the number of organisms plotted against time, these growth rate changes result in a sigmoid curve with a lag phase just after t=0, followed by an exponential phase and then a stationary phase. Different models were used to model fungal growth (Amrane et al, 2005;HamidiEsfahani et al, 2007). In this work, the Gompertz growth model was used to fit the biomass growth curve (Eq.…”

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confidence: 99%

Aerobic biotransformation of 2, 4, 6–trichlorophenol by <i>Penicillium chrysogenum</i> in aqueous batch culture: Degradation and residual phytotoxicity

Aranciaga¹,

Durruty²,

Gonzalez³

et al. 2012

WSA

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Abstract2,4,6-trichlorophenol (TCP) is a toxic compound widespread in the environment, with numerous applications. There are many fungi capable of degrading it, although little attention has been paid to non wood-degrading species. Penicillium chrysogenum ERK1 was able to degrade 85% of TCP in batch cultures in the presence of sodium acetate. Degradation rate was fitted to a specific first-order kinetic and the growth rate was fitted to a Gompertz model. Hydroquinone and benzoquinone were identified as degradation intermediates. The phytotoxicity of the residues was reduced by half after fungal treatment. These results suggest that Penicillium chrysogenum can be applied successfully to biodegrade TCP.

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“…3 Specific lipase production rate versus specific growth rate for Bacillus thermoamylovorans CH6B grown in shake flasks. Symbols: experimental data, solid line: calculated data on glucose and arginine, and attributed to a diauxic behaviour of the microorganism [31]. In the present case, the nongrowth-associated character of lipase production has been identified, but more investigation would be required before advancing further hypothesis on the metabolism of this strain.…”

Section: Kinetics Of Cell Growth and Lipolytic Production In Flask Cumentioning

confidence: 92%

A process for extracellular thermostable lipase production by a novel Bacillus thermoamylovorans strain

Deive

Álvarez

Morán

et al. 2012

Bioprocess Biosyst Eng

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A lipolytic enzyme-producing thermophilic microorganism, recently isolated from a hot spring in Galicia (North Western Spain), has been investigated. First, the strain was genetically identified and tentatively named Bacillus thermoamylovorans CH6B. It produced significant levels (around 450 U/L) of extracellular lipolytic activity in shake flask cultures, and the most suitable conditions for this biological process were found at temperatures between 50 and 55 °C, and an initial pH value around 7.0. Next, a preliminary scaling up of the process was carried out in a 5-L stirred tank bioreactor, and it was concluded that operation at agitation and aeration rates of 300 rpm and 0.33 vvm, respectively, were advisable. In both type of cultures, the results were successfully fitted to logistic equations, and the relationship between lipase production and cell growth was investigated. Furthermore, some relevant properties of the crude lipolytic enzyme extracts were assessed. The crude biocatalyst preferentially hydrolysed p-nitrophenyl esters of medium and long-chain fatty acids. Thermal stability in aqueous solution of the produced enzyme was also promising, and the deactivation profiles were fitted to a series-type deactivation model.

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An unstructured model for the diauxic growth of Penicillium camembertii on glucose and arginine

Cited by 12 publications

References 28 publications

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

Aerobic biotransformation of 2, 4, 6–trichlorophenol by <i>Penicillium chrysogenum</i> in aqueous batch culture: Degradation and residual phytotoxicity

A process for extracellular thermostable lipase production by a novel Bacillus thermoamylovorans strain

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