Seasonal dynamics of soil enzymes and microbial activities in a typical secondary broad-leaved forest at Shiwan Mountain, South China Effects of fungal endophytes on cell suspension culture of Cinnamomum longepaniculatum Secondary metabolites of endophytic Guignardia mangiferae from Smilax glabra and their antitumor activities Effect of secondary fermentation on processing technology for fermented soybeans Flavonoids in plants of Iris L. and their biological activities