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  • Springer  (7)
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  • 1
    Publication Date: 1991-06-01
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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  • 2
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary At pH 3.6, Lactobacillus plantarum is unable to grow on citrate or to ferment it in the absence of another carbon source such as glucose. In a defined medium containing glucose and citrate, with a higher concentration of the former than the latter, as in many fermented alcoholic beverages, L. plantarum will first ferment the sugar. The production of lactate from glucose degradation increases the acidity of the medium and inhibits the fermentation of citrate. In co-culture with Saccharomyces cerevisiae, part of the glucose is fermented by the yeast, partly avoiding the pH drop and the inhibition of citrate fermentation by L. plantarum. Fermentation was still possible at pH values around 3.0.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 34 (1968), S. 441-457 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A wide range of fungi were tested for their ability to assimilate a series of hydrocarbons, which includedn-paraffins, aromatic hydrocarbons and petroleum fractions. The property is not evenly distributed among the various fungal classes, but is to be found mainly in two orders, the Mucorales and the Moniliales. Within the latter order, the generaAspergillus andPenicillium are rich in hydrocarbon-assimilating strains. In other genera, the property of assimilating hydrocarbons is relatively rare. Hydrocarbon assimilation is not necessarily common to related species, nor proper to one species, but more the property of individual strains. Different strains belonging to the same species differ in metabolic activity when they are tested against a series of hydrocarbons. The property of assimilating hydrocarbons appears to lack taxonomic value. Species of the same genus show only a tendency to behave in a similar way, e.g.Penicillium strains usually assimilaten-decane and light gas oil whereasAspergillus strains seldom do so. Aspergillus species sporulate better on long chainn-paraffins. On some hydrocarbons, they develop particular pigments. n-Paraffins with at least ten carbon atoms support better growth than petroleum fractions. Individual strains are very sensitive to minor changes in hydrocarbon composition or structure. Only sparse delayed growth is observed on aromatic hydrocarbons.n-Heptane, petroleum ether, naphtha and kerosene are often toxic whereas aromatic hydrocarbons are usually non-toxic.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 34 (1968), S. 197-204 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Candida lipolytica, grown onn-hexadecane as the sole source of carbon and energy, contained 17.1% lipids in the logarithmic phase of growth, and 7.3% lipids in the stationary phase of growth. When the yeast was grown on glucose, it contained 6.2% lipids in the logarithmic phase of growth, and 3.6% lipids in the stationary phase of growth. Fatty acids, that could be extracted by petroleum ether after saponification, constituted the major part of the fatty acids ofC. lipolytica in its logarithmic phase of growth on glucose. They constituted only a minor amount of the fatty acids in the stationary phase of growth on glucose. The reverse was true when the yeast was grown onn-hexadecane. The broth contained more free, petroleum ether-soluble fatty acids when the cellular lipid content was high than when it was low. Overnight starvation ofC. lipolytica grown onn-hexadecane in a carbon-free nutrient medium, removed the residual cell-bound hydrocarbon, increased the cell population by one half and decreased the cellular lipid content (as % of dry yeast) by one third. Various methods for the determination of lipids, described as appropriate for yeasts were compared. The highest yields were obtained by extraction of the freeze-dried paste, at room temperature, with a 1:1 chloroform-methanol mixture.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 3 (1987), S. 1-1 
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 79-91 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Whole cells of the yeast Candida lipolytica exhibited a high, cyanide-sensitive endogenous respiration which became completely cyanide-insensitive under certain physiological circumstances namely (1) in the stationary phase of growth and (2) upon aeration in the resting state. This cannot be due to a change in permeability of the cell wall as the respiration of protoplasts showed the same (in)sensitivity to cyanide as the cells from which they were obtained. The cyanide-insensitive respiration of C. lipolytica was located in the mitochondria and coexisted with the normal respiratory chain, as the mitochondria isolated from cyanide-insensitive cells exhibited at the same time a cyanidesensitive respiration of ascorbate and N,N,N′,N′-tetramethyl-p-phenylenediamine and a cyanide-insensitive respiration of succinate. The alternate respiratory pathway was sensitive to benzyl- and salicylhydroxamic acids. In this respect it resembles the alternate mitochondrial pathway described in the literature for various plants. The cyanide-insensitive respiration did not appear in the resting state when the cells were aerated in the presence of cycloheximide nor at 0 C instead of at room temperature. These facts suggest some form of induction involving new protein synthesis. The induction process depends on the presence of molecular oxygen as the cyanide-insensitive endogenous respiration did not appear during agitation of yeast cells in the resting state if the gaseous atmosphere lacked oxygen.
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  • 7
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé Depuis 1981, l'Administration Générale Belge de la Coopération au Développement (AGCD) a confié à l'Université Catholique de Louvain (Unité de Génie Biologique: Professeurs E.-J. Nyns et H. Naveau) la gestion d'un projet de développement de la biométhanisation au Burundi. C'est d'abord l'établissement d'une cellule de base à Bujumbura destinée à devenir permanente, ensuite, la formation de stagiaires homologues Burundais et l'implantation de 10 digesteurs méthaniques par le projet Belgo-Burundais qui ont contribué de manière décisive au développement de la biométhanisation au Burundi. Depuis 1984, plus de 120 digesteurs méthaniques nouveaux ont été construits dans le cadre de divers projets temporaires régionaux, allemand et chinois, pour ne citer que ceux-là. Ces divers projets temporaires sont désormais coordonnés au sein de la Direction Générale de l'Energie du Ministère Burundais de l'Energie et des Mines qui, grâce à la cellule de base, en assure la continuité. Le projet Belgo-Burundais assure aujourd'hui le suivi scientifique et technique de ces digesteurs. Il collabore à l'étude de leur conception. Il assure la promotion de l'utilisation des effluents digérés, la formation de stagiaires et l'étude des outils d'utilisation du biogaz.
    Notes: Summary Since 1981, the Belgian General Administration for Development and Cooperation (BADC) has granted the Catholic University of Louvain (Unit of Bioengineering: Professors E.-J. Nyns and H. Naveau) a project aimed at implementing biomethanation in Burundi. Its objective is to establish a centralized unit in Bujumbura, which is meant to become permanent, as well as to train Burundese staff and technicians in the construction of 10 methane digesters by the Belgian-Burundese project which have already contributed in a decisive way to the success of biomethanation in Burundi. Since 1984, more than 120 new methane digesters have been constructed within the frame of several temporary regional projects, German and Chinese, to quote but two. These various temporary projects are presently coordinated by the General Directorate for Energy of the Burundese Ministry of Energy and Mines, which, thanks to the centralized unit, ensures continuity. The Belgian-Burundese project ensures today the scientific and technical follow-up of these digesters. It is involved in the study of their design. It ensures the promotion of the end uses of digested effluents, the extension services and the study of appropriate devices for biogas end use.
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