Process are provided which are effective for controlling medium conductivity during fermentation of a CO-containing gaseous substrate while providing an STY of about 10 g ethanol/(L.Math.day) or more. The process includes balancing medium conductivity, specific carbon uptake or cell density levels.

A method for the substantially complete conversion of hydrogenous matter to higher value product, the method comprising: (i) subjecting the hydrogenous matter to a substantially complete deconstruction process in which an aqueous phase containing a multiplicity of deconstructed compounds is produced; and (ii) contacting the aqueous phase with an anode of a microbial electrolysis cell, said anode containing a community of microbes thereon which oxidatively degrade one or more of the oxygenated organic compounds in the aqueous phase to produce protons and free electrons at the anode, wherein the protons and free electrons are transported to the cathode to produce hydrogen gas or a valuable reduced organic compound at the cathode upon application of a suitable cell potential across the anode and cathode. The invention is also directed to an apparatus for practicing the method described above.

The present invention relates to a transformed strain having ethanol production potential, constructed by introducing a foreign gene for ethanol production into a non-ethanol producing acetogen Eubacterium limosum and a method for producing ethanol, using the strain. According to the present invention, Eubacterium limosum which is a conventional acetogen lacking ethanol production potential is used to produce ethanol, which is a high value-added product, as a single product from carbon monoxide contained in waste gas.

Provided is a method which allows, for example, suppression of foaming in the purification step such as distillation and continuous operation, as well as direct treatment of a waste liquid (can liquid) without having to subject the same to an extra purification treatment by removing the microorganisms, nitrogen compounds, and phosphorous compounds at once from an organic substance-containing liquid obtained from microbial fermentation. Also disclosed is a method for producing an organic substance, comprising a microbial fermentation step, a separation step, a liquefaction step, and a second purification step, wherein the concentration of the nitrogen compound in the second can liquid is 0 to 150 ppm based on the total mass of the second can liquid, and the concentration of the phosphorous compound in the second can liquid is 0 to 5 ppm based on the total mass of the second can liquid.

Controlling the gas inlet flow rate and energy input to a fermentation reactor to maximize conversion of syngas by maximizing uptake of hydrogen into a medium relative to carbon dioxide and carbon monoxide based on determined volumetric mass transfer coefficients for hydrogen, carbon monoxide, and carbon dioxide.

The disclosure provides methods for the production of liquefied petroleum gas from sustainable feedstocks, including methods comprising conversion of alcohols produced by gas fermentation for the production of propane and/or butane.

The present invention relates to a Myceliophthora thermophila host cell which expresses a recombinant enzymes from Fusarium oxysporum with beta-xylosidase activity. The invention also refers to an enzymatic composition comprising the host cell of the invention and/or the recombinant enzyme with beta-xylosidase activity expressed by the host cell of the invention. The invention further relates to the use of the host cell of the invention, the recombinant enzyme with beta-xylosidase activity expressed by the host cell of the invention or the composition of the invention for the degradation of biomass and to a method of producing bioproducts, preferably bioethanol, which comprises the use of the host cell of the invention, the recombinant enzyme with beta-xylosidase activity expressed by the host cell of the invention or the composition of the invention.

Compositions and methods for a hybrid biological and chemical process that captures and converts carbon dioxide and/or other forms of inorganic carbon and/or CI carbon sources including but not limited to carbon monoxide, methane, methanol, formate, or formic acid, and/or mixtures containing CI chemicals including but not limited to various syngas compositions, into organic chemicals including biofuels or other valuable biomass, chemical, industrial, or pharmaceutical products are provided. The present invention, in certain embodiments, fixes inorganic carbon or CI carbon sources into longer carbon chain organic chemicals by utilizing microorganisms capable of performing the oxyhydrogen reaction and the autotrophic fixation of CO.sub.2 in one or more steps of the process.

Provided is a highly efficient ethanol-fermentative yeast having high efficiency in ethanol production without introducing a foreign gene. The highly efficient ethanol-fermentative yeast is a fermentative yeast that effectively produces ethanol from pentose and hexose and is deposited to NITE Patent Microorganisms Depositary under the accession number NITE BP-01962.

A fusion chimeric protein is described herein that can assemble a functional carboxysome core, which is able to fix carbon by taking atmospheric carbon dioxide and converting it into useful carbon-containing compounds such as 3-phosphoglycerate (3-PGA).