Influences and protective effects of roadside tree-belt on heavy metal pollution of roadside soils: a case study of major roads in Shanxi Neuroprotective effects of curcumin Chemical constituents from rhizomes of Rhodiola wallichiana var. cholaensis and their protective effects on myocardium Neuroprotective effects of Curcumin Geostrophic deviation analysis of regional effects of protective forest system in reducing windspeed in north Liaoning plain