Browsing A - Mathematics and Natural Sciences by Author "Usman, Usman"
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ANALISIS KANDUNGAN LOGAM BERAT Pb DAN Cd DI MUARA SUNGAI MANGGAR BALIKPAPAN
Godfrida Any, Yusriana Dewi; S. A., Samson; Usman, Usman (Program Studi Ilmu Lingkungan, Pascasarjana Universitas Udayana, 2018-11-11)Human activities around the estuary of the Manggar river in Balikpapan produce waste disposal and cause heavy metal contamination such as lead (Pb) and cadmium (Cd) in water bodies.The contaminant can endanger the life ... -
Antioxidant Activity of Secondary Metabolite Compounds from Lichen Teloschistes flavicans
Maulidiyah, Maulidiyah; Akhmad, Darmawan; Usman, Usman; Andi, Musdalifah; La Ode, Agus Salim; Muhammad, Nurdin (Biointerface Research in Applied Chemistry, 2021-03-01)In the last decade, lichen has become a research interest related to exploring secondary metabolites compounds. Lichen is a unique organism and contains specific chemical compounds rarely found in other natural sources; ... -
The Effectiveness of Using Learning Media 3D Pop-Up Chemistry Assisted by Project Based Learning (PjBL) Learning Model Against Student Learning Outcomes on the Subject of Colloid Systems in SMA Negeri 12 Samarinda
Ijai, Ijai; Subagiyo, Lambang; Nurlaili, Nurlaili; Usman, Usman (IOSR Journal of Research & Method in Education, 2021-04)Background: Learning media is one important aspect that can affect the quality of student learning at school. Lack of use of media in the learning process can affect student motivation and learning outcomes in schools, ... -
ISOLATION AND CHARACTERIZATION OF STIGMASTEROL AND BETA-SITOSTEROL FROM WOOD BARK EXTRACT OF Baccaurea macrocarpa Miq. Mull. Arg
Erwin, Erwin; Pusparohmana, Widar R.; Safitry, Rizka D.; Marliana, Eva; Usman, Usman; Kusuma, Irawan W. (Rasayan Journal, 2020-12-01)Baccaurea macrocarpa Miq. Mull. Arg. (known locally as Tampoi) is one of edible fruit plants found in the forests of Borneo. The crude extract of wood bark of Tampoi was partitioned with n-hexane and ethyl acetate successively ...