TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In the method, the anaerobic microorganism is an obligate anaerobe, and the anaerobic recombinant microorganism is an anaerobe resistant to a microaerobic environment. The anaerobic microorganism is from the genus Clostridium. The oxidoreductase is an oxygenase or luciferase. The transcriptional regulatory sequence comprises a constitutive promoter. The expression of the nucleotide sequence is independent of expression of a gene or set of genes in a biosynthetic pathway for production of the fermentation product. The nucleotide sequence has an A/T content of at least 50%. The fermentation product is a solvent or an organic acid. The solvent is an alcohol or ketone. The organic acid is a carboxylic acid. The organic acid is acetate, butyrate, isobutyrate, isopropionate, propionate, lactate, citrate, and aminovalerate. The alcohol is butanol, isobutanol, ethanol, methanol, propanol, and isopropanol. The ketone is acetone and butanone. The conditions comprise sparging with gas comprising at least 0.1% oxygen (O2). The microaerobic fermentative conditions comprise at least about 0.5% dissolved oxygen. The microaerobic fermentative conditions comprise a dissolved oxygen content of at least about 0.1 parts per million (ppm). The volumetric productivity, product titer, oxygen-tolerance, or phenolic growth inhibitor tolerance is increased in the recombinant anaerobic microorganism as compared to the anaerobic microorganism. The volumetric productivity of butanol, titer of butanol, oxygen-tolerance, and tolerance of phenolic growth inhibitors are increased by at least 10% as compared to the anaerobic microorganism. The volumetric productivity of butanol is increased by 10-50% relative to culturing the recombinant anaerobic microorganism anaerobic ally. The fermentation product titer is increased by at least 10% relative to culturing the recombinant anaerobic microorganism anaerobic ally. The culture conditions comprise at least about 0.1g/L phenolic growth inhibitor, e.g. furfural, hydroxymethyl furfural, vanillin, p-coumarate, ferulic acid, 4-hydroxybenzoate, vanillic acid, and syringaldehyde. The method further comprises continuous culture. The method alters production of two fermentation products, where the ratio of the two fermentation products is at least about 10% higher or lower in the recombinant anaerobic microorganism compared to the anaerobic microorganism. The two fermentation products are solvents, preferably alcohols, e.g. butanol, isobutanol, ethanol, methanol, propanol, and isopropanol. The solvent are an alcohol and a ketone. The alcohol is butanol, isobutanol, ethanol, methanol, propanol, or isopropanol, and the ketone is acetone, or butanone. The two solvents are organic acids, e.g. acetate, butyrate, isobutyrate, isopropionate, propionate, lactate, citrate, and aminovalerate. In making fuel, the recombinant anaerobic bacteria are a gram-positive bacteria resistant to a microaerobic environment. The recombinant anaerobic bacteria are from the genus Clostridium. The recombinant anaerobic bacteria comprise a heterologous nucleotide sequence encoding an oxidoreductase, preferably luciferase. The oxidoreductase is heterologous. The fuel is ethanol, butanol, isopropanol, and methanol. Culturing a recombinant anaerobic bacteria in a bioreactor under microaerobic conditions produces the fuel at a rate of greater than 0.15 g/L/hour. Culturing a recombinant anaerobic bacteria in a bioreactor under microaerobic conditions produces the fuel at a rate that is at least 10% greater than a recombinant anaerobic bacteria that does not comprise a heterologous nucleotide sequence encoding an oxidoreductase. Alternatively, making fuel comprises: (a) transforming a bacteria with a recombinant heterologous nucleic acid comprising a nucleotide sequence encoding for an oxidoreductase; (b) culturing the transformed bacteria under conditions suitable for biosynthesis of a fuel; and (c) collecting the fuel. Culturing does not include monitoring of the level of oxidoreductase expression or activity. The oxidoreductase is not a luciferase. The oxidoreductase is not selected from lux and luc. Collecting provides collecting at least 10% more fuel than is provided by culturing bacteria that are not transformed with a heterologous oxidoreductase. The fuel is butanol, methanol, ethanol, or isopropanol, preferably butanol. Preferred Bioreactor: In the bioreactor, the fermentation product-producing recombinant anaerobic microorganism comprises a heterologous recombinant nucleic acid molecule comprising a nucleotide sequence encoding an oxidoreductase. In the bioreactor, the culture conditions permit the bacteria to produce a fermentation product at a rate 10 % greater than the non-transformed gram-positive bacteria. The bacteria are from the genus Clostridium. The transformed Gram-positive bacteria comprise a heterologous recombinant nucleic acid molecule comprising a nucleotide sequence encoding an oxidoreductase. EXAMPLE - No suitable example given.