Histocytology Observation on the Somatic Embryogenesis in Ananas comosus Callus Cloning of Flowering-related Gene AcMADS1 and Characterization of Expression in Tissues of Pineapple (Ananas comosus) Chemical constituents from leaves of Ananas comosus and their biological activities Difference in Sugar Accumulation of Pineapple Fruit Harvested in Different Seasons Difference in Sugar Accumulation of Pineapple Fruit Harvested in Different Seasons Histocytology Observation on the Somatic Embryogenesis in Ananas comosus Callus Transmembrane transport behavior of in vitro HepG2 cells of ananas and its effect on lipids and glucose distribution