Acer: A plant genus of the family ACERACEAE, best known for trees with palmately lobed leaves.Alkaline Ceramidase: A ceramidase subtype that is active at alkaline pH. It is found at high levels within the SMALL INTESTINE.Fagus: A plant genus of the family FAGACEAE.Trees: Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.Ceramidases: Amidohydrolases that are specific for the cleavage of the N-acyl linkage of CERAMIDES. Ceramidases are classified as acidic, neutral or basic according to the optimal pH with which they function.Diarylheptanoids: A group of compounds consisting of two aromatic rings separated by seven carbons (HEPTANES) and having various substituents. The best known member is CURCUMIN.Neutral Ceramidase: A ceramidase subtype that is active at neutral pH. It is found at high levels within the SMALL INTESTINE and in the BRAIN.