Abstract: Investigation of the activity of extracts of the clam Spisula polynyma has led to antitumour long-chain, straight-chain alkane or alkene compounds which have a 2-amino group and a 3-hydroxy group.

Abstract: A method for producing meal containing mannose, wherein powder particles containing cellulose and/or hemicellulose is mixed with the wet composition obtained by having a mannnan degrading enzyme function to Arecaceae plant-derived meals such as copra meal and/or palm kernel meal followed by the drying process. Production rate of mannose is increased by causing reaction under high level of water content, in addition to which drying efficiency is increased by mixing hygroscopic fiber materials to the wet composition, an enzymic reactant, and thus meal containing mannose can be produced with high efficiency and good economical performance.