Capital Normal University 3 articles published in JoVE Behavior An Adjustable High-Definition Imaging System for Behavioral Studies of Drosophila Adults Tong Li*1,2, Yujia Weng*1,2, Daxiang Yang1 1Department of Zoology and Animal Physiology, College of Biological Sciences, China Agricultural University, 2College of Life Sciences, Capital Normal University This protocol describes how to make a simple adult Drosophila behavior observation chamber, and how to take high-definition photographs/videos of the morphology or behavior of different types of fruit flies in the observation chamber through relatively simple and affordable methods. Chemistry Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor Xiao Wu*1, Donglin Diao*1, Zhangwei Lu*1, Yu Han1, Shi Xu2, Xinhui Lou1 1Department of Chemistry, Capital Normal University, 2College of Life Sciences, Capital Normal University A protocol for the in vitro selection and characterization of group-specific phthalic acid ester- binding DNA aptamers is presented. The application of the selected aptamer in an electrochemical aptasensor is also included. Developmental Biology A Method for Characterizing Embryogenesis in Arabidopsis Jinlin Feng1,2, Ligeng Ma1 1College of Life Sciences, Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Capital Normal University, 2College of Life Science, Shanxi Normal University This protocol outlines a method for observing embryogenesis in Arabidopsis via ovule clearance followed by the inspection of embryo pattern formation under a microscope.