Toho University 2 articles published in JoVE Environment Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O Megumi Kuroiwa1, Keitaro Fukushima2,3, Kazuma Hashimoto2, Yukiko Senga4, Tsubasa Sato4, Chie Katsuyama5, Yuichi Suwa1 1Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 1Department of Biological Sciences, Faculty of Science and Engineering, Chuo University, 2Faculty & Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 3Center for Ecological Research, Kyoto University, 4Department of Chemistry, Faculty of Science, Toho University, 5Graduate School of Integrated Arts and Sciences, Hiroshima University A series of methods to determine the potential DNRA rate based on 14NH4+/15NH4+ analyses is provided in detail. NH4+ is converted into N2O via several steps and analyzed using quadrupole gas chromatography–mass spectrometry. Chemistry Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds Akinobu Z. Suzuki1, Yukiko Shiraishi1, Hanami Aoki1, Hirona Sasaki1, Rei Watahiki1, Toshiaki Furuta1 1Department of Biomolecular Science, Faculty of Science, Toho University A protocol for the synthesis and measurement of the photochemical properties of modular caged compounds with clickable moieties is presented.