List of Articles Omer Kayir Article 1 - Chemical constituents, quantitative analysis and insecticidal activities of plant extract and essential oil from <i>Origanum onites</i> L. 20.1001.1.25883623.2018.2.2.4.4 Ramazan Erenler Ibrahim Demirtas Tunay Karan Fatih Gul Omer Kayir Omer Karakoc Trends in Phytochemical Research , Issue 2 , Year , Spring 2018