Studies of hemocytes DNA damage by two pesticides acetamiprid and chlorpyrifos in predaceous spiders of Pardosa astrigera Koch Application of Comet Assay in Plant Protoplast Apoptosis Detection Ethylene Induction of Apoptosis in Carrot Protoplasts Defend Effects of Melatonin on Protoplasts of Gentiana macrophylla Under UV-B Irridiation