Novel fiber coated with β-cyclodextrin derivatives used for headspace solid-phase microextraction of ephedrine and methamphetamine in human urine

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217 views

Headspace solid-phase microextraction with novel sol–gel permethylated-β-cyclodextrin/hydroxyl-termination silicone oil fiber for determination of polybrominated diphenyl ethers

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219 views

Guangzhou Zexin Leather Co.,ltd--PPT

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155 views

Guangzhou zexin leather co.,ltd -ppt (1)

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91 views