Anatomical Structure of Stem and Adventitious Root Formation of Feijoa Cuttings Optimization of enzymatic extraction of effective constituents from fibrous roots of Salvia miltiorrhiza by central composite design and response surface method Research progress on tissue culture of Glycyrrhizae Radix et Rhizoma Comparison on histology of root tubers and fibrous roots of Ophiopogon japonicus and ophiopogonins content Progress in study on medicinal value of medicinal parts of Kochia scoparia