摘要:
A crosslinking agent constituted by a cyclodextrin clathrate compound of a compound having isocyanate group(s). This crosslinking agent is stable at room temperature and very readily initiates crosslinking. The crosslinking agent is prepared by reacting a compound having isocyanate group(s) with cyclodextrin at 65.degree. C. or below in water, and recovering the clathrate compound from the water.
摘要:
An alkaline protease is produced by cultivation of novel microorganism strains belonging to the Bacillus genus. The alkaline protease has optimum pH of 11 to 12 and is useful as an additive for detergents.
摘要:
A new deoxyribonuclease (DNase) having preservability and high temperature stability is provided by cultivating a new strain M-26 of the genus Bacillus in an alkaline culture medium. The DNase has such a specificity that it very selectively cleaves phosphodiester bonds between deoxyguanosine and deoxyguanosine in a molecule of deoxyribonucleic acid (DNA) while leaving phosphate groups at the 5'-position.
摘要:
The invention relates to a method of judging the thermostability of a protein, comprising the steps of calculating an analytical value specific to a test protein by a principal component analysis based on the amino acid composition of the protein calculated from the data of the amino acid sequence of the protein or the nucleotide sequence of the gene and comparing the analytical value with an analytical value of a protein which is retained by a thermostable organism and corresponds to the test protein, and further relates to a program for allowing a computer to execute processing for judging the thermostability of a protein by the method, and a computer readable recording medium having recorded the program thereon.
摘要:
Disclosed are a novel microorganism (FERM BP-5144) belonging to the genus Plesiomonas and having ability to produce maltose phosphorylase and trehalose phosphorylase required for the enzymatic production of trehalose and novel maltose phosphorylase and trehalose phosphorylase obtainable from the microorganism as well as a process for producing the enzymes. A novel process for enzymatically producing trehalose (O-.alpha.-D-glucopyranosyl-(1.fwdarw.1)-D-glucopyranoside) is also disclosed.
摘要:
A microorganism belonging to the genus Flavobacterium posessing the capacity to decompose hydrocarbons, tolerance to sulfurous acids, tolerance to salinity, tolerance to organic solvents, and tolerance to pressure. The microorganism is of a strain of the genus Flavobacterium DS-711 (FERM BP-4010). A hydrocarbon emulsifier or solubilizer having as an active component thereof a water soluble and acetone insoluble fraction obtained by culturing DS-711 strain. In addition the emulsifier or solubilizer obtained by culturing the strain DS-711 contains 18.4% protein, 18.8% carbohydrates and 28.6% lipids. A separation method for an organic-solvent tolerant microorganism, wherein a sample is mixed with water and an organic solvent, shaking culturing is conducted, a cultured mixture is allowed to stand, separation into an aqueous phase and an organic solvent phase is conducted, an appropriate amount of said organic solvent phase is added to a culture medium and cultured, and microorganisms which grow therein are isolated.
摘要:
A novel plasmid pXP102-3 which is constructed from Aeromonas sp. No. 212 chromosomal DNA fragment coding for production of xylanase and a vector plasmid pEAP2 carrying a DNA fragment coding for production and secretion of penicillinase. A novel microorganism, Escherichia coli HB101 (pXP102-3), containing the plasmid pXP102-3 and being capable of producing and secreting penicillinase and xylanase. A method for cultivation of the microorganism characterized in that it is cultured in a broth containing NaCl for 12 to 48 hours.
摘要:
The present invention relates to a method for preparing magnetic powder comprising homogeneous and fine particles using an alkali-producing enzyme. The object of the present invention is to provide a method suitable for preparing magnetic powder comprising relatively small particles, for instance, fine particles having a particle size ranging from 50 to 500 nm. The present invention relates to a method for preparing at least one member selected from the group consisting of iron oxides, iron hydroxides and iron oxyhydroxides which comprises the step of alkalizing a solution containing iron ions utilizing an alkali-producing enzyme and a substrate of the enzyme.According to the present invention, there can be produced magnetite (Fe.sub.3 O.sub.4) and maghemite (gamma-Fe.sub.2 O.sub.3) useful as magnetic powder as well as goethite (alpha-FeO(OH)), hematite (alpha-Fe.sub.2 O.sub.3) and lepidocrocite (gamma-FeO(OH)) useful as the starting materials thereof. The magnetic powder can be used as the materials for magnetic recording and magnetic fluid; carriers for bioreactors; those for magnetic separation of cells and biopolymers; and those for microcarriers of medicines.
摘要:
A novel plasmid pCX311, which was constructed from Bacillus sp. C125 chromosomal DNA carrying the gene for extracellular production of xylanase and a vector plasmid pBR322. A novel microorganism, Escherichia coli HB101 (pCX311) carrying the plasmid pCX311 and being capable of extracellular production of xylanase. Method for culturing the microorganism characterized by cultivation of it in the medium containing NaCl (or KCl) and bran, or NaCl (or KCl) and xylan for 12-48 hours. According to this invention, useful high-molecular substances can be produced in a high yield.
摘要:
Process for the oil extraction from oil sand comprising: mixing oil sand, cyclodextrin, a hydrocarbon solvent, a flocculating agent and water with one another to prepare a suspension, leaving the suspension to stand or centrifuging it to separate into an oil, a water and a sand layer, and then collecting the oil layer.