Enkleia siamensis Kurz (Thymeliaceae) is a climbing shrub commonly distributed throughout the northeastern region of Thailand. An ethanolic extract of the dried roots was found to be active in the P-388 in vitro cytotoxicity assay (ED50 0.1 µg/ml). Bioassay-directed fractionation of the total alcoholic extract resulted in the isolation of three coumarins, clausarin, nordentatin, and daphnoretin.Clausarin and nordentatin were obtained from the petroleum ether fraction of the ethanolic extract.Clausarin was identified by comparing its spectra ('H nmr, uv, ir, ms) with published data (1,2). Norden-
According to the powder paint coating's preparation, designed a set of powder system with micro smash and classification. Optimized the structure of the grinding machine, Used independent SLK superfine powder machine's classification. Through controlled and corresponded parameter of system. While satisfied with the product's grain-size distribution, Raised the production efficiency, Reduced the energy consumption, System performance to be stable by the trial production.
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