摘要:
This invention provides a novel process for producing cyclodextrin by reacting cyclodextrin glycosyl transferase having an optimum pH on the alkaline side with gelatinized starch. According to this invention, cyclodextrin can be obtained in the form of a pure crystal in a high yield by reacting a glucomylase with the reaction mixture liquid formed by the above enzymatic reaction to decompose unreacted starch, concentrating the liquid, adding a small amount of cyclodextrin as a seed crystal and recovering the precipitated cyclodextrin.
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:
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:
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:
The present invention relates to a novel process for recovering cyclodextrins, characterized in that a solution containing cyclodextrins as well as starches, dextrins, reducing sugars and the like is brought into contact with a hydrophobic, synthetic adsorption resin comprising a porous polymer to adsorb only cyclodextrins, the cyclodextrins thus adsorbed being eluted thereafter with water while being heated to separate and recover said cyclodextrins.
摘要:
The invention aims to provide a novel alkaline protease having peculiar properties such as high alkali activity, resistance to surfactants and calcium-dependent thermostability and exhibiting excellent performance in highly alkaline detergents, and a gene coding for the amino acid sequence thereof. There is provided an alkaline protease with such properties that an active pH range is from 5 to 13, an optimum pH is approximately 12.6, an optimum temperature is 70° C., no activity drop by heating is observed up to 65° C. at pH 10 and the optimum temperature and the thermostability are not affected by Ca2+ ions. Specifically, there is provided, for example, an alkaline protease having an amino acid sequence constituting a mature enzyme as represented by SEQ ID NO: 3 or an amino acid sequence resulting from deletion, substitution, situs inversus arrangement, addition or insertion of a part of amino acids thereof, or derived from Alkaliphillus transvaalensis. The protease cleaves 26 peptide bonds among 29 peptide bonds of acidic insulin B-chain.
摘要:
A method for detecting microorganisms present in a sample comprises the steps of: applying a non-lethal hydrostatic pressure to a sample containing microorganisms; and staining the microorganisms with a fluorescent dye. The method permits a significant increase in the uptake of a fluorescent substance by applying, to a sample, a desired non-lethal hydrostatic pressure, without causing any reduction of the survival rate of microorganisms. The method also permits the elimination of such a secondary effect that the subject microorganism undergoes proliferation during staining the same with a fluorescent dye. Thus, the present invention would contribute to the determination of the correct viable count in a wide variety of technical fields.
摘要:
Methanosarcina alcaliphilum which is alkalophilic methanogen having the optimum growth pH range of from about 8.1 to about 8.7. This strain exhibits excellent properties such as alkalophilicity and resistance to low temperature. This strain makes it possible to carry out methane fermentation methods at an alkaline pH and at a low temperature conditions. This strain is applied to methane fermentation in treating solid waste and waste water. Moreover, the bacterial concentration thereof in a reactor can be increased within a very short time and, therefore, the size of such a reactor can be made compact.
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:
The object of the present invention is to provide a yeast which is tolerant to copper and which can incorporate copper at a high concentration, and also a method of removing or recovering copper from extracellular solution. The present invention is copper-tolerant yeast and the pectinases produced by the yeast. Particularly, the present invention is copper-tolerant yeast Cryptococcus sp. N6 strain isolated from deep-sea sediments and the pectinases produced by the yeast.