1217 results about "Yeast strain" patented technology

A yeast strain, wherein the yeast strain is transformed with at least one copy of a gene coding for <SMALLCAPS>D</SMALLCAPS>-lactate dehydrogenase functionally linked to a promoter sequence allowing the expression of the gene in the yeast strain and the yeast strain has undergone disruption of one or more pyruvate decarboxylase genes or pyruvate dehydrogenase genes. Also, a method of producing <SMALLCAPS>D</SMALLCAPS>-lactic acid including culturing such a yeast strain in a medium and recovering <SMALLCAPS>D</SMALLCAPS>-lactic acid.

The present invention intends to find out a gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia and provide a means of controlling the same. The present invention also intends to provide a process for producing a protein with reduction of an acidic sugar chain by using the thus controlled yeast strain belonging to the genus Pichia. Namely, the present invention includes a protein participating in the addition of mannose phosphate to a sugar chain of a glycoprotein; a gene encoding this protein; a mutant of this gene; a vector carrying the mutant gene; a yeast strain belonging to the genus Pichia having been transformed by this vector; a process for producing a protein with reduction of an acidic sugar chain by using the transformed yeast strain; and a glycoprotein thus produced.

The invention relates to a process for the simultaneous production of xylitol and ethanol from a hydrolyzed lignocellulose-containing material starting. The starting material is fermented with a yeast strain, the ethanol produced is recovered, a chromatographic separation is carried out on the remaining xylitol solution, and pure xylitol is crystallized.

The invention relates generally to the field of industrial microbiology and butanol production. More specifically, the invention relates methods of reducing 2,3-dihydroxy-2-methyl butyrate (DHMB) in butanol production. DHMB can be reduced by inhibiting the reduction of acetolactate to DHMB, for example, by knocking out enzymes that catalyze the reduction or by removing DHMB during or after fermentation. Yeast strains, compositions, and methods for reducing DHMB and increasing butanol yield are provided.

The present invention relates to microbial fermentation technology, and is especially Candida lipolytica and the erythritol producing process therewith. The erythritol producing process includes the following steps: 1. fermentation in glucose containing culture medium with Candida lipolytica for producing erythritol in high yield; and 2. separating and purifying erythritol from the fermented liquid.

A mixture of probiotics effective to reduce the contamination of enteric bacteria in humans and other monogastric animals. The mixture of probiotics includes one or more acid-producing bacteria strains and one or more yeast strains, and may advantageously be supplemented with a source of nutrients, such as prebiotics including fructo-oligosaccharides. In a preferred embodiment, said one or more bacteria strains contain Enterococcus faecium strain NCIMB #10415, and said one or more yeast strains contain NCYC #47 and CNCM I-1079.

The invention discloses a Saccharomyces cerevisiae strain and a method for producing ethanol by fermenting stalks, the strain is Saccharomyces cerevisiae DQ1, the collection No. is CGMCC No.2528, the strain can tolerate methanoic acid, acetic acid and furfural type inhibitors in hydrolyzate of the stalks, tolerate high glucose concentration and ethanol concentration and have wide growth temperature, and the strain is fermented at high temperature; the method for producing the ethanol by fermenting the stalks comprises two-stage culture of seeds, wherein the first stage culture is carried out in a synthetic culture medium for 16-24 hours, the second stage culture is that a mixed culture medium containing 30-70 percent of hydrolyzate is inoculated into with the inoculation amount of 5-10 percent for culture for 15-20 hours, and the inoculation into the hydrolyzate with the inoculation amount of 10 percent or simultaneous saccharification and fermentation of the stalks is further carried out for producing the ethanol. The invention has the advantages of being applicable to high-solid-content stalk enzyme hydrolysis and simultaneous saccharification and fermentation, with short fermentation period, high ethanol yield, and low production cost, thereby having great industrial application prospect.

The invention relates to a strain used as hametz of microorganism, belonging to technical field of processing agricultural microorganism and food, which comprises the strain and the compound hametz ofplant lactocin as well as the application. The invention is characterized in that: the microzyme-Custer bouquet yeast strain can obtain by separating and filtering, which is suitable for fermenting the rice steamed sponge cake; the yeast strain is preserved in Chinese typical culturing and preserving centre and the preserved number is CCTCC NO: M207150. The microorganism compound hametz can be made by the ZSM-001 Custer bouquet yeast strain and AS1.510 plant lactocin (Lactobacillus plantarum), and can be used in rice fermented products, such as rice steamed sponge cakes. The invention has theadvantages of good fermenting performance and easy commercial process, and the products made by the invention have a typical sweet and sour perfume.

The invention relates to the technical field of gene engineering, and discloses a recombinant yeast strain, and a construction method and application thereof. In the recombinant yeast strain, gal1, gal7, gal10 and ypl062w genes are knocked out, and the recombinant yeast strain comprises 9 gene segments which are integrated to the genome by yeast homologous recombination. The construction method comprises the following steps: constructing a four-knock-out yeast strain to provide an optimized host cell for producing beta-carotin, selecting lycopene cyclases crtY from different sources, and carrying out modular design to integrate functional genes crtE crtB and crtI of the specific-source synthetic lycopene, specific yeast endogenous genes and the like to the four-knock-out yeast strain genome, thereby obtaining a brand-new recombinant strain capable of producing beta-carotin at high yield.

The invention discloses a soy sauce production method capable of ensuring high protein conversion rate and utilization rate, which belongs to the technical field of soy sauce seasoning production. In the method, bean pulp and wheat are taken as raw materials; a soy sauce finished product is obtained by a continuous cooking process, a process of mixing and fermenting a plurality of strains, subsequent treatment and filling; and the special raw materials treated by the continuous cooking process are mixed with screened and domesticated aspergillus oryzae strains with high proteinase activity, fermentation and starter propagation are performed on the mixture, and aroma-increasing high-salt yeast strain fermentation liquor with specific aroma-increasing flavor is added in a subsequent sauce mash fermentation stage for the soy sauce seasoning production. The soy sauce production method has the advantages of advanced equipment and treatment process, high raw material conversion rate and utilization rate, low cost, high product quality and the like.

The invention discloses a marine yeast for biologically preventing and treating postharvest diseases of fruits and vegetables, a method for preparing the same and application thereof. A marine yeast strain Rhodosporidium p aludigenum Fell & Tallman is screened out from the seawater of the coastal waters of the East China Sea. The colony of the marine yeast is pink, has a smooth surface, and grows in a culture medium added with 1 to 2 percent NaCl. The use of a cell suspension of the yeast with certain concentration can effectively inhibit various postharvest main mycoses such as alternaria, botrytis cinerea, penicilllum expansum, penicillium digitatum, and pestalotia. The marine yeast strain Rhodosporidium p aludigenum Fell & Tallman is used for biologically preventing and controlling the postharvest diseases of fruits and vegetables for the first time both at home and abroad. The strain has various functions of preventing decay, controlling oxidative stain, controlling softening flavour reversion and the like, and has the advantages of convenient use, no generation of antibiotic, no environment pollution, security, innocuity, and broad market prospect. At the same time, the strain is conducive to the export for earning foreign currency of China's high-quality fruit and vegetable products, and has significant economic and social benefits.

The present invention is directed to a yeast strain, or strains, secreting a full suite, or any subset of that, full suite, of enzymes to hydrolyze com starch, corn fiber, lignocellulose, (including enzymes that hydrolyze linkages in cellulose, hemicelhiiose, and between lignin and carbohydrates) and to utilize pentose sugars (xylose and arabinose). The invention is also directed to the set of proteins that are well expressed in yeast for each category of enzymatic activity. The resulting strain, or strains can be used to hydrolyze starch and cellulose simultaneously. The resulting strain, or strains can be also metabolically engineered to produce less glycerol and uptake acetate. The resulting strain, or strains can also be used to produce ethanol from granular starch without liquefaction.; The resulting strain, or strains, can be further used to reduce the amount of external enzyme needed to hydrolyze a biomass feedstock during an Simultaneous Saccharification and Fermentation (SSF) process, or to increase the yield of ethanol during SSF at current saccharolytic enzyme loadings. In addition, multiple enzymes of the present invention can be co-expressed in cells of the invention to provide synergistic digestive action on biomass feedstock. In some aspects, host cells expressing different heterologous saccharolytic enzymes can also be co-cultured togetherand used to produce ethanol from biomass feedstock.

The invention discloses a brewing yeast strain, which has the classified name Saccharomyces cerevisiae Y09tj, and is preserved in Common Microorganism Center of China General Microbiological Culture Collection Center with the preservation number of CGMCC No.3476. The invention also provides a breeding method for the strain and a method for producing ethanol by quick high-temperature thick mash fermentation of starch. The strain is obtained by the following steps of: separating from common self-brewed sweet wine of peasant families; and performing ultraviolet mutagenesis for breeding. The brewing yeast strain CGMCC NO.3476 has the advantages of quick growth, strong fermentation capacity, high ethanol toxin resistance, and high-glucose concentration resistance of 62 percent (m/v) to the maximum. The average wine yield by the method is improved by 1.2 percent than that of other producing strains, and the wine yield can reach 16.0 percent (v/v); the fermentation period is short, and only 46 hours; the equipment utilization rate can be greatly improved; and the fermentation cost is greatly reduced.

The invention relates to the technical field of gene engineering, and discloses a recombinant yeast strain, and a construction method and an application thereof. The recombinant yeast strain is obtained through the following steps: knocking out gal1, gal7, gal10 and ypl062w genes, integrating three gene fragments a genome through yeast homologous recombination, further knocking out an rox1 gene, and further integrating two gene fragments to the yeast genome. The gene knockout yeast strain constructed in the invention provides optimized host cells for production of lycopene; and combined functional genes crtE, crtB and crtI having specific sources and used for synthesizing the lycopene and specific yeast endogenous genes are selected and are integrated to the gene knockout strain genome through modular designing, so the brand new recombinant strain for highly yielding lycopene is obtained.

The invention relates to the technical field of gene engineering, and discloses a recombinant yeast strain, and a building method and application thereof. The recombinant yeast strain includes two specific gene segments recombined and integrated onto a genome in a homologous way through yeast. By selecting the specific group for forming a promoter combination and matching phaffia rhodozyma sourced phytoene synthetase and lycopene cyclase dual-function enzyme gene CrtYB, GGPP synthase CrtE, phytoene desaturase CrtI and specific yeast endogenous gene and the like, the substances are integrated onto the yeast strain genome through modular design; the yp1062w gene is knocked away through homologous recombination; one strain of fire-new recombinant yeast without an inducing agent is obtained; the high yield of the beta-renieratene is ensured.