Prokaryotic Expreesion and RNA Interference Vector Construction for Geranyl Diphosphate Synthase of Mentha haplocalyx Briq. Antimicrobial Activities of Mentha haplocalyx Briq. Essential Oil Characteristics of Photosynthesis and Thermal Dissipation in Mentha haplocalyx Briq.in Qinghai Chemical constituents from Mentha haplocalyx