NOVELTY - Fermentation using carbon-containing material comprises mixing a carbon-containing material with a culture comprising genetically modified microorganisms that, in a fermentation process, yield a first product and a fermentation residual comprising a nutrient, where the content of the nutrient in the fermentation residual is greater than that of unmodified corresponding microorganisms when used in the fermentation process.    USE - The methods, microorganisms, and compositions are useful for fermentation using carbon-containing material. The method is useful for producing fermentation product such as alcohol.    ADVANTAGE - The present invention provides compositions and methods that are designed to increase the value output of a fermentation facility; and provides fermentation scheme that maintain the high ethanol production, and at the same time yield fermentation residuals of higher commercial value.    DETAILED DESCRIPTION - Fermentation using carbon-containing material comprises:    (A) mixing a carbon-containing material with a culture comprising genetically modified microorganisms that, in a fermentation process, yield a first product and a fermentation residual comprising a nutrient, where the content of the nutrient in the fermentation residual is greater than that of unmodified corresponding microorganisms when used in the fermentation process;    (B) fermenting the culture under conditions suitable for commercial production of the first product and under conditions suitable for production the nutrient;    (C) separating the first product from the culture; and    (D) producing the fermentation residual.    INDEPENDENT CLAIMS are:    (1) a genetically modified microorganism that, in a fermentation process, produces a first product for commercialization and a fermentation residual comprising a nutrient, where the content of the nutrient in the fermentation residual is greater than that of an unmodified corresponding microorganism when used in the fermentation reaction;    (2) a fermentation culture comprising (i) a genetically modified microorganism that, in a fermentation reaction, produces a first product for commercialization and a fermentation residual comprising a nutrient, where the content of the nutrient in the fermentation residual is greater than that of an unmodified corresponding microorganism when used in the fermentation reaction, and (ii) a fermentation medium comprising a carbon source for production of the nutrient, where the culture produces the product;    (3) an expression vector comprising an exogenous sequence encoding a polypeptide comprising at least one essential amino acid for a domesticated animal, where expression of the exogenous sequence is induced when a fermentation reaction producing an alcohol or an alkane has achieved at least 50% completion;    (4) a fermentation residual from a commercial fermentation process of a genetically mourned microorganism, the fermentation residual having a greater amount of a nutrient as compared with a fermentation residual from a commercial fermentation process of a microorganism not so genetically modified;    (5) a complete animal feed comprising at least 15% of fermentation residual by weight;    (6) a business method of increasing value of a fermentation plant;    (7) a process comprising combining a fermentation residual with a nutrient; and    (8) a composition comprising a fermentation residual supplemented with an exogenous nutrient.