Chemical Composition and Antibacterial Activities of the Essential Oils Isolated from Leaves of Mentha × piperita, M. haplocalyx and M. × gentilis Effects of Mentha piperita Extracts on Activities of Several Enzymes of Tetranychus cinnabarinus Isolation and Identification of the Principal Acaricidal Components Extracted from Mentha piperita Effect of enhanced UV-B radiation on photosynthetic structure and photosynthetic characteristics of Mentha piperita