Abstract: This invention provides a fermentation method of producing gellan gum, wherein a certain amount of fermentation broth is retained in the fermentor as a seed for next batch fermentation or transferred to another fermentor as a seed for next batch fermentation in that fermentor. The fermentation method of this invention reduces fermentation cost of gellan gum and lowers contamination risk during seed cultivation.

Abstract: The invention provides a new fermentation process for producing gellan gum, which can control the feeding amount and feeding speed of the nitrogen sources accurately and quantitatively, and control the growth and gum production of the strains, so as to significantly improve the controllability, stability and yield of the fermentation process for producing gellan gum.

Abstract: This invention provides a fermentation method of producing gellan gum, wherein a certain amount of fermentation broth is retained in the fermentor as a seed for next batch fermentation or transferred to another fermentor as a seed for next batch fermentation in that fermentor. The fermentation method of this invention reduces fermentation cost of gellan gum and lowers contamination risk during seed cultivation.

Abstract: The invention provides a new fermentation process for producing gellan gum, which can control the feeding amount and feeding speed of the nitrogen sources accurately and quantitatively, and control the growth and gum production of the strains, so as to significantly improve the controllability, stability and yield of the fermentation process for producing gellan gum.

Abstract: The present invention relates to a process for the production of a valuable compound by cultivation of a microorganism comprising cultivating the microorganism in a medium wherein all nutrients are provided in excess over the whole cultivation period and wherein a suitable amount of oxygen is fed to the culture to maintain the culture under conditions of oxygen limitation.

Abstract: The present invention relates to a process for the production of a valuable compound by cultivation of a microorganism comprising cultivating the microorganism in a medium wherein all nutrients are provided in excess over the whole cultivation period and wherein a suitable amount of oxygen is fed to the culture to maintain the culture under conditions of oxygen limitation.

Abstract: The invention relates to oxalate deficient A. niger strains for the production of a given enzyme, wherein the oxalate deficient strain produces at least the same amount of enzyme as the wild type strain it originates from under the same culture conditions. Preferably, the oxalate deficient A. niger strain produces more enzyme than the wild type strain it originates from under the same culture conditions. More preferably, the oxalate deficient A. niger strain is such that when the strain has been transformed with an expression construct comprising a gene coding for an enzyme, said strain produces at least the amount of the enzyme the wild type strain it originates from would produce under the same culture conditions, when the wild type strain has also been transformed with the same expression construct as the oxalate deficient strain. The invention also relates to method for obtaining such oxalate deficient A. niger strain.

Abstract: The present invention provides a method for the fermentation of yeast, the method comprising fermenting yeast cells in a volume of more than 10 m3; wherein: for more then half of the fermentation time the fermentation temperature is at least 30° C; and the dissolved oxygen tension (DOT) is maintained at more than 5% during at least part of the fermentation.