Abstract: A recombinant microorganism including a genetic modification that increases expression of a gene encoding a ferric enterobactin transporter-associated protein or a gene encoding a TonB-dependent transporter-associated protein, or a genetic modification that decreases expression of a fur gene encoding a ferric uptake regulator (Fur) protein, wherein the recombinant microorganism removes greater amounts of nitric oxide from a sample comprising nitric oxide than a same microorganism without the genetic modification

Abstract: An MXene or a derivative thereof, on which nitrous oxide reductase is immobilized, wherein the MXene has a formula of Mn+1XnTs, wherein M is a transition metal of Groups 3, 4, 5, 6, or a combination thereof, of the Periodic Table of the Elements, X is carbon, nitrogen, or a combination thereof, T is oxide, epoxide, hydroxide, C1-C5 alkoxide, fluoride, chloride, bromide, iodide, or a combination thereof, and n is 1, 2, or 3, and s is 0, 1, or 2.

Abstract: A recombinant microorganism having enhanced ability for reducing nitrogen oxide, a composition comprising the recombinant microorganism for use in decreasing a concentration of nitrogen oxide in a sample, and a method of decreasing a concentration of nitrogen oxide in a sample using the recombinant microorganism or the composition.

Abstract: Provided are recombinant microorganisms having a foreign gene encoding a variant of a nitrous oxide reductase protein, a composition comprising the recombinant microorganism or the variant of a nitrous oxide reductase protein for use in removing nitrous oxide in a sample, a variant of a nitrous oxide reductase protein, and a polynucleotide encoding the variant.

Abstract: Provided are a recombinant microorganisms having a genetic modification that increases the expression of bacterioferritin, a composition comprising the recombinant microorganism for use in reducing a nitrogen oxide concentration in a sample, and a method of reducing a nitrogen oxide concentration in a sample.

Abstract: A recombinant microorganism of the genus Escherichia, comprises a genetic modification that increases expression of a nosZ gene encoding NosZ, which is a nitrous oxide reductase, in the recombinant microorganism, wherein the recombinant microorganism comprises a nosR gene encoding NosR, a nosD gene encoding NosD, a nosF gene encoding NosF, a nosY gene encoding NosY, and an apbE gene encoding ApbE, and wherein the nosR gene, the nosD gene, the nosF gene, the nosY gene and the apbE gene are derived from a microorganism of the genus Pseudomonas, the genus Paracoccus, or a combination thereof.

Abstract: Provided are a recombinant microorganisms having a genetic modification that increases the expression of bacterioferritin, a composition comprising the recombinant microorganism for use in reducing a nitrogen oxide concentration in a sample, and a method of reducing a nitrogen oxide concentration in a sample.

Abstract: A method of reducing a concentration of a nitrogen oxide, the method comprising: contacting a microorganism with a nitrogen oxide-containing sample to reduce the concentration of the nitrogen oxide in the sample, wherein the contacting comprises contacting the microorganism with Fe(II)(L)-NOx in a bioreactor, wherein the Fe(II)(L)-NOx is a complex in which a chelating agent, Fe2+, and NOx are chelated, wherein L is the chelating agent, and wherein NOx is a nitrogen oxide ligand.

Abstract: Provided are polynucleotides encoding variants of nitrous oxide reductase proteins, recombinant microorganisms including a foreign gene encoding a variant of a nitrous oxide reductase protein, and a composition comprising the recombinant microorganism or the variant of a nitrous oxide reductase protein for use in removing nitrous oxide in a sample.

Abstract: An isolated polynucleotide including a promoter region derived from a bacterium of the genus Paracoccus, a recombinant host cell including the isolated polynucleotide, and a method of expressing a target gene by culturing a recombinant host cell comprising a polynucleotide comprising the promoter region and a target gene operably linked to the promoter region, under conditions in which the target gene is expressed.

Abstract: A recombinant microorganism including a genetic modification that increases expression of a gene encoding a ferric enterobactin transporter-associated protein or a gene encoding a TonB-dependent transporter-associated protein, or a genetic modification that decreases expression of a fur gene encoding a ferric uptake regulator (Fur) protein, wherein the recombinant microorganism removes greater amounts of nitric oxide from a sample comprising nitric oxide than a same microorganism without the genetic modification

Abstract: Provided are recombinant microorganisms having a foreign gene encoding a variant of a nitrous oxide reductase protein, a composition comprising the recombinant microorganism or the variant of a nitrous oxide reductase protein for use in removing nitrous oxide in a sample, a variant of a nitrous oxide reductase protein, and a polynucleotide encoding the variant.

Abstract: A recombinant microorganism of the genus Escherichia, comprises a genetic modification that increases expression of a nosZ gene encoding NosZ, which is a nitrous oxide reductase, in the recombinant microorganism, wherein the recombinant microorganism comprises a nosR gene encoding NosR, a nosD gene encoding NosD, a nosF gene encoding NosF, a nosY gene encoding NosY, and an apbE gene encoding ApbE, and wherein the nosR gene, the nosD gene, the nosF gene, the nosY gene and the apbE gene are derived from a microorganism of the genus Pseudomonas, the genus Paracoccus, or a combination thereof.

Abstract: A recombinant microorganism including a genetic modification that increases activity of nitric oxide reductase in the recombinant microorganism, a composition for reducing a concentration of nitric oxide in a sample, the composition including the recombinant microorganism, and a method of reducing a concentration of nitric oxide in a sample, are disclosed.

Abstract: A method of reducing a concentration of N2O, NO, or a combination thereof in a medium, the method comprising: culturing a microorganism of the genus Paracoccus, a microorganism of the genus Pseudomonas, or a combination thereof in a liquid medium comprising Mg2+ ions and Fe(II)(L)-NO, N2O, or a combination thereof, wherein L is a chelating agent; and reducing NO to N2O or N2, or reducing N2O to N2.

Abstract: An isolated polynucleotide including a promoter region derived from a bacterium of the genus Paracoccus, a recombinant host cell including the isolated polynucleotide, and a method of expressing a target gene by culturing a recombinant host cell comprising a polynucleotide comprising the promoter region and a target gene operably linked to the promoter region, under conditions in which the target gene is expressed.

Abstract: Nucleic acids encoding Thermotoga maritima mannitol dehydrogenase and the Thermotoga maritima mannitol dehydrogenase polypeptide are disclosed. Further provided are an electrochemical bioreactor system and a bioreactor electrode that can be used to convert glucose or fructose to mannitol.