The substrate specificity of two yeast strains utilizing hydrocarbons

Pilát, P.; Prokop, A.; Volfová, O.; Panoš, J.; Ragab, A. M.

doi:10.1007/bf02872844

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Growth preferentially occurs on n-alkanes with chain length C9 to C18 while n-alk-l-enes are used less efficiently and by fewer yeasts (160,246). Variations in growth response have been noted (236) between two strains of C. lipolytica utilizing specific hydrocarbons. In general C10 to C18 n-alkanes show little toxicity toward yeast due to low water solubility (91).…”

Section: Carbon Sourcementioning

confidence: 99%

Lipids of yeasts.

Rattray¹,

Schibeci²,

Kidby³

1975

Bacteriological Reviews

191

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Section: Carbon Sourcementioning

confidence: 99%

Lipids of yeasts.

Rattray¹,

Schibeci²,

Kidby³

1975

Bacteriological Reviews

191

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“…Starting with the scheme for metabolism of methanol, summarized in the above section, a basic structure of the models was decided upon and it is shown in Figure l(b). In this structure, it is assumed that methanol and formaldehyde both can diffuse freely in and out of the cells, as was proposed by Papoutsakis et al l 3 The diffusion steps are represented by dotted lines in the figure. However, the diffusion coefficients were considered to be high enough so that diffusion does not limit the reaction rates.…”

Section: Basic Structure Of the Modelsmentioning

confidence: 99%

Regulation phenomena in methanol consuming yeasts: An experiment with model discrimination

Bajpai

Reuß

Held

1981

Biotech & Bioengineering

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SummaryAssimilation as well as dissimilation of methanol in yeasts takes place through its oxidative intermediate formaldehyde which is several times more toxic to the growth of microorganisms than methanol itself. Still, the role of formaldehyde, produced during methanol assimilation, upon growth of yeasts is not clear. In the present paper, an attempt has been made to throw some light upon this aspect. Starting with a basic framework for methanol uptake by yeasts, several models were developed assuming different modes of regulation of key enzymes by methanol and/or formaldehyde. The main feature of the basic framework consists in consideration of two routes for oxidation of formaldehyde to CO2, one associated and the other not associated with production of energy. Further, the rate of energy production from the energy-associated oxidation of formaldehyde is assumed to be controlled by the rate of energy consumption by anabolic reactions. The models were discriminated by subjecting these to biological constraints. As a result, the successful model suggests that in spite of higher inherent toxicity of formaldehyde, methanol exerts the controlling influence upon growth under normal conditions.

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Surface tension as a limiting factor for aerobic n‐alkane biodegradation

Setti

Pifferi

Lanzarini

1995

J of Chemical Tech & Biotech

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A new mathematical model for n-alkane biodegradation in crude oil, heavy oil and paraffinic mixtures is described. The pattern of n-alkane degradation as a function of the inverse of hydrocarbon chain length reported in this paper can be considered as general behaviour for many aerobic n-alkane biodegradation processes. A new interpretation of n-alkane biodegradation as a function of surface tension, is given. A mathematical expression was obtained starting from the degradation values of n-alkane and relative surface tension, which is a parameter independent of fermentation conditions. An interesting parameter, b, was identified which represented the accelerating conversion factor for n-alkane biodegradation. The findings suggested that the n-alkane biodegradation rate may be affected by the fermentation conditions (agitation, aeration, etc.) and by the strain of microorganism, while the behaviour pattern of n-alkane degradation was essentially linked to the substrate characteristics (molecular structure, molecular weight and density).

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The substrate specificity of two yeast strains utilizing hydrocarbons

Cited by 4 publications

References 5 publications

Lipids of yeasts.

Lipids of yeasts.

Regulation phenomena in methanol consuming yeasts: An experiment with model discrimination

Surface tension as a limiting factor for aerobic n‐alkane biodegradation

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