摘要:
A compound of formula (I) wherein R₁ represents hydrogen, hydroxy or acetoxy and R₂ represents hydroxy or acetoxy. The compounds are capable of protecting the nerve cells and also antagonistic activity against N-methyl-D-aspartic acid receptors. They may be prepared by fermentation of a microorganism of the genus Verticillium or a mutant thereof.
摘要:
A recombinant vector suitable for industrially making an animal produce useful protein in the milk, which is constructed by extracting high molecular weight DNA from the bovine liver to prepare a chromosomal gene library, preparing a synthetic DNA probe corresponding to the publicly known bovine αS1 casein chromosomal gene, screening a clone carrying bovine αS1 casein chromosomal gene, confirming that the clone has a base sequence coincident with that of the publicly known bovine αS1 casein chromosomal gene, ligating human prourokinase cDNA with the promoter part and the intron 1 part of the gene, and then inserting the obtained plasmid into a suitable vector. A transgenic mouse prepared by using this recombinant vector secreted a considerable amount of human prourokinase as useful protein in its milk after delivery.
摘要:
A coating agent for delaying the release of a physiologically active substance to be administered per os to ruminants, comprising a veterinarially acceptable water-soluble, synthetic high molecular compound and ethylcellulose, said coating agent being stable in the first stomach of ruminants and capable of being effectively disintegrated in the fourth stomach of ruminants, characterized in that said coating agent further comprises at least one substance which is miscible with both of said high molecular weight compound and ethylcellulose and is insoluble in water. The coating agent protects the active substance from degradation in the first stomach of a ruminant at a pH of about 5.5 and rapidly breaks down in the fourth stomach at a pH of about 3, so releasing the active ingredient for absorption by the animal.
摘要:
The invention relates to a process for the preparation of ascorbic acid-2-phosphate, which comprises reacting ascorbic acid or araboascorbic acid with ATP to produce ascorbic acid-2-phosphate in an aqueous medium in the presence of an effective amount of an enzyme derived from a microorganism and capable of catalyzing the enzymatic reaction of ascorbic acid or araboascorbic acid with ATP to produce ascorbic acid-2-phosphate and recovering the resultant ascorbic acid-2-phosphate from the reaction solution.
摘要:
Mitomycin derivatives having potent antitumour activity have the formula: wherein R represents lower alkyl, cycloalkyl or unsubstituted or substituted aralkyl; X represents hydrogen or carbamoyl; Y and Z each independently represents hydrogen or methyl; and represents an α or β bond.
摘要:
Apparatus for automatic weighing, feeding and mixing of raw granular or powder materials, consisting of storage tanks for at least two different kinds of materials, means for weighing desired quantities of the raw materials from the storage tanks, means for discharging and transferring the weighed granular or powder materials into a mixing tank, a means for mixing the weighed granular or powder materials, and a means for holding a constant quantity of the resultant mixture, all of these means being integrally arranged.
摘要:
This invention provides a new process for producing 7-amino-6-demethyl-6-deoxytetracycline (Compound 3) which is an intermediate for the synthesis of minocycline. Compound 3 can be obtained by reduction of Compound 1 using a dithionite as reducing agent. This invention also provides a method to produce Compound 3 from Compound 2 in one pot. (wherein Ar denotes a substituted aryl group, and X stands for the residue of a mineral acid from which hydrogen atom has been eliminated).
摘要:
Improved process for multiplication on animal cells, which comprises culturing animal cells in a medium containing blood serum or a cell multiplication factor in one section separated from another section by a partition wall, and conducting perfusion culturing in a medium not containing serum nor cell multiplication factor in the another section. Substances useful as medicines can by yielded in large amounts by multiplication of the obtained animal cells.
摘要:
Novel DC-52 derivatives represented by formula (I). These compounds and their pharmaceutically acceptable salts have an excellent oncostatic activity. In the formula, X represents chlorine, bromine, iodine, hydroxy, formyl, hydroxyiminomethyl, cyano, nitro, amino or lower alkanolyamine, Y represents hydroxy, and Z represents cyano, or Y and Z are bound to each other to represent -O- as -Y-Z-.