Abstract: The present invention relates to a hydrogenated polymer which is a hydrogenation product of a conjugated diene polymer having an average vinyl bond content of 20% by weight or more and less than 50% by weight and a weight average molecular weight of 60,000 to 600,000 to a degree such that 85% or more of the residual double bonds in the conjugated diene units are hydrogenated, and which has a molecular weight and a number of terminal methyl group carbons as measured by GPC/FTIR analysis satisfying relationship (1): Va?Vb?0.03Vc??(1) wherein Va, Vb and Vc represent the number of terminal methyl group carbon atoms per 1000 carbon atoms contained in a polymer whose molecular weight is twice the peak top molecular weight, half the peak top molecular weight, and the peak top molecular weight, respectively.

Abstract: The present invention relates to a hydrogenated polymer which is a hydrogenation product of a conjugated diene polymer having an average vinyl bond content of 20% by weight or more and less than 50% by weight and a weight average molecular weight of 60,000 to 600,000 to a degree such that 85% or more of the residual double bonds in the conjugated diene units are hydrogenated, and which has a molecular weight and a number of terminal methyl group carbons as measured by GPC/FTIR analysis satisfying relationship (1):

Abstract: The present invention relates to a process for producing yeast extract which comprises adding chitosan to yeast thereby to accelerate autolysis. Organic solvents have been added in the past. However, organic solvents are frequently not naturally occurring substances in the concentrations used. When yeast extract is used for food, there are problems with toxicity, flavor, etc. should organic solvents not be completely removed. Accordingly the present invention prepares an excellent yeast extract using chitosan derived from natural substances thereby to accelerate autolysis of yeast without the unwanted problems of organic solvents.

Abstract: A divided chamber type diesel engine consisting of a main combustion chamber and a pre-combustion chamber connected to said main combustion chamber through a connecting port, said pre-combustion chamber being provided with a step member on its inner wall for controlling the swirl generated in said pre-combustion chamber during the compression stroke of the engine in order to reduce the NO.sub.x emissions in the exhaust gases.