Abstract: The invention relates to a procedure for chemically determining the base sequence of DNA and, in particular, its step of cleaving the labeled DNA having undergone a base-selective chemical modification at the position of the modified base. More particularly, it relates to a method for cleaving DNA which comprises modifying DNA base-selectively with chemical reagents, bringing the resulting reaction mixture into contact with an adsorbent to adsorb the chemically modified DNA on the adsorbent, washing the adsorbent with a washing fluid to remove any chemical modification reagents from the adsorbent, bringing the adsorbent into contact with an eluent to elute the chemically modified DNA adsorbed thereon, concentrating the resulting eluate and then heating it together with a cleavage reagent.

Abstract: This invention is to provide a novel process for the isomerization of a cycloolefin having an endo form to a cycloolefin having an exo form. The resulting isomer mixture has a novel composition, and a random copolymer produced from the above compositionally novel isomer mixture and ethylene has an excellent heat resistance and mechanical strength.

Abstract: Disclosed is a composition for forming a thermosetting resin having excellent impact resistance and toughness. The composition comprises a bismaleimide compound represented by formula (I): ##STR1## wherein R is a hydrogen atom or methyl, and an amine compound represented by formula (II): ##STR2## wherein X is a radical selected from the group of divalent hydrocarbons having from 1 to 10 carbon atoms, hexafluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl, oxo, ##STR3## or by formula (III)): ##STR4## where in n is an integer of 0 to 50. Also disclosed is a process for preparing the composition.

Abstract: Disclosed is a fluorine-containing copolymer composition comprising (A) a fluorine-containing copolymer comprising (a) a fluoro-olefin and (b) an organic silicon compound having an olefinic unsaturated bond and a hydrolyzable group in the molecule and (B) an organic silicon compound having an isocyanate group.This composition is soluble in an organic solvent at normal temperature and is curable at normal temperature. If a curing catalyst is incorporated in this composition, the resulting composition can be effectively used as a coating composition.

Abstract: The invention relates to an aromatic amine resin comprising a mixture of aromatic amine compounds represented by the following general formula (a): ##STR1## wherein A represents a phenylene, alkyl-substituted phenylene, diphenylene, diphenyl ether or naphthylenyl group, R.sup.1 represents a halogen atom or a hydroxyl C.sub.1-4 alkoxy or C.sub.1-5 alkyl group, l is 1 or 2, m is 0, 1, 2 or 3, n is an integer from 0 to 300 and when m is 2 or 3, the R.sup.1 group may be same or different and may join to form a 5- or 6-membered alicyclic moiety which may optionally contain one or more side chains, and also relates to processes for producing the same and a thermosetting composition containing the same.

Abstract: A pre-oriented molded article of ultrahigh-molecular-weight polyethylene is composed of ultrahigh-molecular-weight polyethylene having an intrinsic viscosity of at least 5 dl/g, has a degree of orientation of at least 0.8, and has such a creep property that a stretched product of the molded article having a degree of orientation of about 0.97 shows an elongation of not more than 2% in an atmosphere at 80.degree. C. at 1000 seconds. The pre-oriented molded article is produced by (1) extruding a high-concentration molding solution composed of 15 to 80 parts by weight of ultrahigh-molecular-weight polyethylene and 85 to 20 parts by weight of a solvent capable of dissolving said polyethylene from a molding die at a temperature at which the molding solution remains a solution, (2) taking up the extrudate at a draft ratio of at least 3, and cooling the extrudate during or after take-up to crystallize the polyethylene in the extrudate and to form a pre-oriented molded article.

Abstract: The cleaning method of the present invention comprises; (a) immersing a material to be cleaned in a mixed solvent contained in the first open vessel, wherein the mixed solvent consists of a chlorofluoro-hydrocarbon with a boiling point of 20.degree.-50.degree. C. and an organic solvent with a boiling point of 50.degree. C. or more higher than that of said chlorofluoro-hydrocarbon and compatible therewith, but not azeotropic therewith, and kept at a temperature within a range between the boiling point of the chlorofluoro-hydrocarbon and a temperature of at least 30.degree. C.

Abstract: The effective ingredient in the inventive medicament against infection with mycoplasma is tea, e.g., black tea, or a tea polyphenol as a constituent of tea including epigallocatechin gallate, epicatechin gallate, epigallocatechin, epicatechin, (+) catechin and the isomer thereof, free theaflavin, theaflavin monogallates A and B and theaflavin digallate.

Abstract: A higher yield of the difluorohalomethoxybenzene produced by the reaction of a metal phenolate with dibromodifluoromethane or bromochlorodifluoromethane can be obtained by conducting the addition of a metal alcoholate or a metal hydride as a reaction initiator to a solution or a suspension of an aprotic polar solvent containing the metal phenolate and dibromodifluoromethane or bromochlorodifluoromethane.

Abstract: The present invention relates to a process for preparing a hard transparent resin comprising polymerizing a monomer (A) having both a functional group of the following formula (I): ##STR1## wherein X is selected from the group consisting of an oxygen atom and a sulfur atom,and a functional group selected from the group consisting of a functional group of the formula (II):CH.sub.2 CR--COO-- (II)wherein R is selected from the group consisting of hydrogen and methyl group,and a functional group of the formula (III): ##STR2## The invention also provides a process for preparing a transparent resin comprising copolymerizing monomer (A) with a monomer (B) having at least one functional group selected from the group consisting ofCH.sub.2 .dbd.CHCOO--,CH.sub.2 .dbd.C(CH.sub.3)--COO--, and ##STR3## This resin can be suitably used as a glazing material, and in the manufacture of optical lenses, optical information recording medium substrates, etc.

Abstract: Disclosed is a thermosetting resin composition which comprises a specific bismaleimide compound or polymaleimide and a specific aromatic diamine compound. It can be widely used for electrical and electronic parts, various structural parts, sliding parts and the like.

Abstract: An amide derivative represented by the following general formula (I) ##STR1## wherein one of X and Y represents a sulfur atom and the other represents a carbon atom, Z represents a nitrile or thioamide group, each of R.sup.1 and R.sup.2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a halomethyl group or a phenyl group, and R.sup.

Abstract: Crude pentachloronitrobenzene containing hexachlorobenzene and small amounts of acids is treated in the molten state or in a mixture solution of nitrobenzene or chloronitrobenzenes with an inorganic basic substance and then subjected to a distillation under reduced pressure.

Abstract: Needle-like electrically conductive zinc oxide filler having low specific volume resistance and excellent electrical conductivity-imparting effect per unit weight thereof is provided, including a method for its preparation.

Abstract: Presented in this invention are a bottle made of polyethylene naphthalate resin and formed by stretching a preform so that the stretch index defined as follows be 130 cm or more, wherein gas barrier properties are improved greatly.

Abstract: Imide prepolymers comprising unsaturated bisimides, diamines, and tribromophenylmaleimide in cured state show improved heat resistance, especially soldering heat resistance and flame retardance as well as mechanical properties and are suitable as laminates.

Abstract: Catechol derivatives which relate to the production of nerve growth factor in particular tissues of brain are disclosed.Methods for the synthesis, data on the physiological activity, and data on the toxicity of these derivatives as well as examples of preparation for their administration are also disclosed.The disclosed derivatives provide preventive and remedial effect for regressive disorders in the central nervous system including senile dementia of Alzheimer type.

Abstract: This invention concerns a polyolefin resin composition composed essentially of(A) a polyolefin resin,(B) an alkyl disulfide compound represented by formula [I]R.sup.1 --S--S--R.sup.2 [I]wherein R.sup.1 and R.sup.2 are the same or different and each denotes an alkyl group with 10 or more carbon atoms,(C) a triazine compound represented by formula [II] ##STR1## and/or a benzene compound represented by formula [III] ##STR2## According to this invention, there is provided the stabilized polyolefin resin composition that can resistant to heat ageing for a long period of time without discoloring.

Abstract: There is provided a light-emitting or receiving device having improved weatherability, chemical resistance, hardness, and optical properties, wherein a light-emitting or receiving element is encapsulated with a polymer of a polymerizable liquid composition comprising (a) a monomer or an oligomer or a mixture thereof containing a diallyl compound as an essential ingredient.There is also provided an encapsulant and a method for encapsulating a light-emitting or receiving element.

Abstract: Disclosed herein is a method for controlling the molecular weight of a propylene homo- or co-polymer at a constant level upon subjecting propylene alone or a mixture of propylene and another .alpha.-olefin copolymerizable with propylene as a monomer or monomer mixture to bulk polymerization in the presence of hydrogen as a molecular weight modifier in a reaction tank equipped with a reflux condenser.