Grain-size features of aeolian sand on the east coast of Hainan Island and the revealed evolutionary processes of the sedimentary environment

The Mudui stratigraphic section represents the typical records of sedimentation processes of sand dunes and interdune depressions on the east coast of Hainan Island.Based on high-density sampling and optically stimulated luminescence(OSL) dating of the strata of the section,the grain-size composition,grain-size parameters,cumulative distribution probability curve,and grain-size-sensitivity indexes(SC/D) were analyzed.The analyzed results show that the grain-size features of aeolian sand,weakly developed sandy paleosol,two-facies(aeolian and aqueous) deposits,and lagoon deposits are all different.This indicates four evolutionary phases of the sedimentary environment of the east coast of Hainan Island since 38 ka B.P.Phase I:38-22 ka B.P.;phase II:22-17 ka B.P.;phase III:17-10 ka B.P.;phase IV:10 ka B.P.-present.The climate experienced the hot-wet/hot-dry,hot-wet/hot-dry,and warm-wet/hot-wet fluctuations,and the sedimentary environment also underwent lagoon deposition,dune and interdune depression deposition,dune stabilization and soil development,shifting sand deposition,and evolutionary processes.

Recent progress and clinical applications of advanced biomaterials in cosmetic surgery

Materials of different allogeneic or xenogeneic or autologous origins are widely used as soft-tissue fillers or structural scaffolds in the field of cosmetic surgery,while complications including prosthesis infection,donor site deformity and filler embolization have always been difficult problems for plastic surgeons.The application of novel biomaterials may bring in hopeful solutions for these problems.Recently,some advanced biomaterials,such as regenerative biomaterials can effectively promote the repair of defective tissues,which have been proven to have good therapeutic as well as cosmetic effects in cosmetic surgery.Therefore,biomaterials with active compounds have drawn significant attention for the tissue regeneration of reconstructive and esthetic treatment.Some of these applications have achieved better clinical outcomes than traditional biological materials.This review summarized recent progress and clinical applications of advanced biomaterials in cosmetic surgery.