[Research of preferences and security management of tourists in Poyang Lake based on schistosomiasis prevention].

Objective: To discuss the prevention of schistosomiasis in tourism of lake region.

Methods: The seasonal distribution of tourism activities and spatial distribution of scenic spots, as well as the coupling between space and temporal of Oncomelania snail distribution and the transmission time of schistosomiasis in Poyang Lake region were analyzed. The travel preference of schistosomiasis susceptible population was surveyed by questionnaires and interviews.

Two new 11(15-->1)abeotaxanes with a 2,20-epoxy ring from the needles of Taxus canadensis.

Two 11(15-->1)abeotaxanes having a tetrahydrofuran ring along the carbon atoms C-2, C-3, C-4, C-20 were identified for the first time from the needles of the Canadian yew, Taxus canadensis. The compounds could be identified as 4alpha,10beta,13alpha-triacetoxy-15-benzoyloxy-2alpha,20beta-epoxy-11(15-->1)abeotax-11-ene-5alpha,7beta,9alpha-triol (1) and 4alpha,7beta,9alpha,10beta,15-pentaacetoxy-2alpha,20beta-epoxy-11(15-->1)abeotax-11-ene-5alpha,13alpha-diol (2) on the basis of 1D-, 2D-NMR evidence and high-resolution FABMS analysis. Compound 1 showed weak growth inhibitory activities against T-98 and MM1-CB cells in vitro.