Abstract: The present invention concerns novel Saccharomyces cerevisiae yeast strains capable of multiplying on a substrate comprising at least one C5 sugar with a speed and rate of multiplication compatible with the industrial production of yeast. It also concerns novel strains which, when cultured, make it possible to obtain yeasts having an application efficiency, i.e. an efficiency that is satisfactory in applications and uses of interest in industries such as breadmaking, biomass production, flavour production, the production of secondary metabolites, protein production, ethanol production, brewing, winemaking or the production of yeast extract.

Abstract: The subject matter of the present invention is novel yeast strains capable of metabolizing xylose and resistant to at least one fermentation inhibitor, and also to the method of obtaining same. The subject of the present invention is also the yeasts obtained by culturing said yeast strains and the use thereof for producing at least one fermentation product, preferably ethanol, in particular in a culture medium comprising xylose and at least one fermentation inhibitor.

Abstract: The present invention relates to a method for obtaining a strain capable of efficiently propagating in a low nutritive potential medium, capable of metabolising pentoses and of resisting fermentation inhibitors, comprising the following steps; a) growth of a strain of recombinant yeast with a strain of wild yeast lacking any impairments, the recombinant yeast strain comprising at least one copy of an exogenous gene of xylose isomerase and at least one additional copy of a gene of D-xylulokinase included in the genome and linked to a single sexual characteristic of the strain, b) at least two cycles of genome shuffling by sporulation and or random hybridization, c) selection of the population obtained in step b) according to a suitability criterion of the strains to metabolize xylose, d) selection of the population obtained in step c) according to a suitability criterion of the strains to grow in a Pref type medium, a medium with low nutritive value.

Abstract: The present invention relates to a method for obtaining improved strains of yeast by integrating at least one gene of interest in a region linked to a sex expression locus, followed by cross-breeding. The present invention also relates to gene integration cassettes and to vectors that can be used in the context of said method. The present invention also relates to improved strains of yeast obtained by the above method, the derived strains of yeast and the yeasts obtained by culturing said strains of yeast.

Abstract: The present invention relates to methods for obtaining ethanol-producing yeast strains, yeast strains thus produced, and the industrial production of ethanol from said strains. More particularly, the present invention describes in its most general aspect, a method for preparing yeasts from Saccharomyces cerevisiae strains by means of the integration, into the genome of the yeast, of at least one gene encoding xylose isomerase and of at least one gene encoding xylitol dehydrogenase. The strains of the invention are useful for producing ethanol from a medium comprising at least one pentose, preferably xylose or a mixture of xylose and arabinose.

Abstract: The present invention relates to a novel method for obtaining improved strains of yeast by integrating at least one gene of interest in a region linked to a sex expression locus, followed by cross-breeding. The present invention also relates to gene integration cassettes and to vectors that can be used in the context of said method. The present invention also relates to improved strains of yeast obtained by the above method, the derived strains of yeast and the yeasts obtained by culturing said strains of yeast.

Abstract: The present invention concerns novel Saccharomyces cerevisiae yeast strains capable of multiplying on a substrate comprising at least one C5 sugar with a speed and rate of multiplication compatible with the industrial production of yeast. It also concerns novel strains which, when cultured, make it possible to obtain yeasts having an application efficiency, i.e. an efficiency that is satisfactory in applications and uses of interest in industries such as breadmaking, biomass production, flavour production, the production of secondary metabolites, protein production, ethanol production, brewing, winemaking or the production of yeast extract.

Abstract: The present invention relates to the field of methods for obtaining ethanol-producing yeast strains, to the field of the thus produced strains and to the field of the industrial production of ethanol from said strains. Particularly, the present invention relates, in the most general aspect thereof, to a method for preparing yeasts from industrial Saccharomyces cerevisiae strains, to said strains, and to the use thereof in the industrial production of ethanol from industrial media containing at least one pentose.

Abstract: The subject matter of the present invention is novel yeast strains capable of metabolizing xylose and resistant to at least one fermentation inhibitor, and also to the method of obtaining same. The subject of the present invention is also the yeasts obtained by culturing said yeast strains and the use thereof for producing at least one fermentation product, preferably ethanol, in particular in a culture medium comprising xylose and at least one fermentation inhibitor.

Abstract: The present invention relates to the field of methods for obtaining ethanol-producing yeast strains, to the field of the thus produced strains and to the field of the industrial production of ethanol from said strains. Particularly, the present invention relates, in the most general aspect thereof, to a method for preparing yeasts from industrial Saccharomyces cerevisiae strains, to said strains, and to the use thereof in the industrial production of ehtanol from industrial media containing at least one pentose.

Abstract: The present invention relates to the field of the methods for obtaining yeast strains producing ethanol, of the thereby produced strains, and of the industrial production of ethanol from said strains. More particularly, the present invention describes in its most general aspect, a method for preparing yeasts from Saccharomyces cerevisiae strains by integration into the genome of the yeast of at least one gene coding for xylose isomerase and of at least one gene coding for xylitol dehydrogenase. The strain of the invention is useful for producing ethanol from a medium comprising at least one pentose, preferably xylose or a xylose and arabinose mixture.