Abstract: The present invention provides a method for producing a polypeptide, which comprises condensing precursors comprising an amino acid and an adaptor in the presence of ribosomes, rRNAs, a larger ribosomal subunit or ribosomal proteins, and an aromatic tertiary amine.

Abstract: The present invention provides a process for producing a carboxylic acid phenyl ester having such a high purity that is required in various fields.A process for producing a highly pure carboxylic acid phenyl ester by reacting an aromatic hydroxy compound with a carboxylic acid anhydride, characterized by conducting the reaction in the presence of 0.01 part by weight or more of a tertiary amine per 100 parts by weight of the aromatic hydroxy compound.

Abstract: The present invention provides an aromatic oligomer comprising repeating structural units represented by the following formula (I), which oligomer has a number-average degree of polymerization of 2 to 10 and a flow temperature of 100.degree. to 400.degree. C.; and a process for preparing the same: ##STR1## wherein X is selected from O and S; and Ar is selected from ##STR2## wherein R.sup.1 and R.sup.2 are each selected from alkyl group having 1 to 3 carbon atoms and phenyl group, and p and q are each an integer of 0 to 2.The aromatic oligomer of this invention is mixed or reacted with a polymeric substance such as thermoplastic resin, thermosetting resin and rubber to realize enhancement of performance and functional characteristics of the polymeric material.

Abstract: An aromatic polyester superior in heat resistance and mechanical properties and satisfactory in lightness and color tone is provided. The aromatic polyester has resorcinol structure, has the formula (1), ##STR1## wherein R is halogen, C.sub.1 -C.sub.5 alkyl, or phenyl; m is an integer of 0 to 2, and when m is 2, the two substituents represented by R may be different from each other; and gives a powder fraction having a lightness (L value) of 70 or more and a red degree (a value) of 5 or less, which powder fraction is obtained by pulverizing the heat-resistant aromatic polyester, sieving the pulverized polyester by Tyler standard sieves and being allowed to pass through 60-mesh sieve but not 325-mesh sieve.

Abstract: A liquid crystal polyester resin composition improved in fluidity which comprises 100 parts by weight of liquid crystal polyester and 0.5-10 parts by weight of an oligomer comprising a repeating structural unit of the formula ##STR1## as the main component and having a flow temperature determined by a specified method which is in the range of 160.degree.-350.degree. C. and is at least 20.degree. C. lower than the flow temperature of the liquid crystal polyester to be combined therewith.