Abstract: Process for producing S-adenosyl-L-homocysteine, which comprises reacting adenosine with homocysteine by contacting them in an aqueous medium in the presence of cells or treated cells of a microorganism of a specified genus having the ability to synthesize S-adenosyl-L-homocysteine from adenosine and homocysteine, and collecting the S-adenosyl-L-homocysteine synthesized.

Abstract: A method for producing S-adenosyl-L-homocysteine hydrolase, which comprises cultivating a microorganism having the ability to produce S-adenosyl-L-homocysteine hydrolase within its cells in a nutrient medium to accumulate said hydrolase in the cells, said microorganism being a bacterium belonging to the genera Alcaligenes, Pseudomonas, Acinetobacter, Arthrobacter, Enterobacter, Rhodopseudomonas, Agrobacterium, Micrococcus, Corynebacterium, Brevibacterium, Chromobacterium, Xanthomonas, Flavobacterium, Cellulomonas, Azotobacter and Protaminobacter, or an actinomycete belonging to the genera Streptomyces, Mycobacterium, Nocardia, Streptoverticillium, Micromonospora, Micropolyspora, Streptosporangium and Microellobosporia; and then recovering S-adenosyl-L-homocysteine hydrolase from the cells.

Abstract: S-adenosyl-L-homocysteine is produced by contacting adenosine with D-homocysteine in an aqueous medium in the presence of cells or treated cells of a microorganism of the genus Pseudomonas having the ability to racemize D-homocysteine to DL-homocysteine and in the presence of S-adenosyl-L-homocysteine hydrolase, to synthesize S-adenosyl-L-homocysteine, and thereafter collecting it.

Abstract: A yeast culture containing at least 10% by weight, based on the dry cell, of S-adenosyl methionine; and a process for producing S-adenosyl methionine, which comprises cultivating a yeast having the ability to produce S-adenosyl methionine in a liquid culture medium containing methionine to accumulate at least 10% by weight, based on the dry yeast cells, of S-adenosyl methionine in the yeast cells, separating the yeast cells from the culture medium, and thereafter obtaining S-adenosyl methionine in a stable form from the yeast cells.

Abstract: Hydrocarbon resins comprising about 95-35% by weight of units derived from 1,3-pentadiene, about 1-50% by weight of units derived from cyclododecatriene, and O-about 40% by weight of units derived from at least one monoolefin containing 5 carbon atoms, having a softening point of from about 100.degree. to about 160.degree. C., and being substantially gel-free. The hydrocarbon resins can be prepared by polymerizing a monomeric mixture comprising 1,3-pentadiene in the presence of a Friedel-Crafts type metal halide catalyst, said monomeric mixture comprising about 95-35% by weight of 1,3-pentadiene, about 1-50% by weight of cyclododecatriene, and 0-about 50% by weight of at least one monoolefin containing 5 carbon atoms.

Abstract: A process for preparing petroleum resins having a low melt viscosity and satisfactory compatibility, characterized by firstly polymerizing a first feed portion comprising at least one chain conjugated diolefin having 4 to 5 carbon atoms and at least one monoolefinic unsaturated hydrocarbon having 4 to 10 carbon atoms in a proportion of 20 - 80 percent by weight of the monomers contained in the first feed portion and secondly polymerizing a second feed portion comprising at least one such chain conjugated diolefin and, if desired, at least one such monoolefinic unsaturated hydrocarbon, the first and second polymerizations being successively conducted in the presence of a Friedel-Crafts type catalyst in a polymerization reactor or reactors connected in series to each other.