Penelitian ini bertujuan untuk mengetahui perkembangan kemampuan berfikir kritis dan motivasi belajar siswa, serta mengetahui keterlaksanaan pembelajaran discovery learning pada siswa Miftahuddeen School, Nathawee District, Thailand. Penelitian ini merupakan penelitian tindakan kelas. Teknik pengumpulan data yang digunakan adalah observasi, angket, dan tes hasil belajar siswa. Analisis data yang digunakan adalah deskriptif kualitatif. Hasil dari penelitian ini menunjukkan keterlaksanaan pengelolaan pembelajaran dengan menggunakan model discovery learning mengalami peningkatan. Pada siklus I skor rata-rata keseluruhan 3,60 dan pada siklus II skor rata-rata keleuruhan siswa yaitu 3,83 dengan kategori sangat baik. Kemampuan berfikir kritis siswa dengan menggunakan model discovery learning mengalami peningkatan pada siklus I sebesar 74,44% dan siklus II sebesar 82,78%. Pada observasi peningkatan motivasi belajar siswa dapat diketahui pada siklus I ada 6 siswa yang motivasinya dibawah 50%, sedangkan pada siklus II tidak ada siswa yang motivasinya dibawah 50% dan sebanyak 14 siswa yang motivasi belajarnya meningkat.
Oil sludge is a product of petroleum mining activities and causes environmental pollution. However, oil sludge, including hazardous and toxic waste materials (B3), has been less effective in reducing oil sludge pollution. Thus, the researcher solved the issue by using hydrocarbonoclastic. It is necessary to use hydrocarbonoclastic bacteria isolated directly from their habitat (indigenous bacteria) as hydrocarbon degrading agents. Therefore, this study aimed to isolate and identify indigenous thermophilic bacteria from East Kalimantan Oil sludge. This study is an observational study that is analyzed descriptively. Procedure for isolation and identification of thermophilic bacteria from oil sludge grow on Synthetic Mineral Water media (SMW) with and without an autoclave. The Microbact Identification System Kit GNB 24E was used to characterize colonies macroscopically, microscopically, Gram staining, physiological tests (catalase, coagulase, and motility tests), and biochemically. The bacteria that were successfully isolated were later identified with Microbact Software and Bergey's book Manual of Determinative Bacteriology Ninth Edition. The results of the isolation and identification of thermophilic Indigenous bacteria from Oil Sludge Kalimantan Timur found Pseudomonas aeruginosa species with a similarity accuracy of 98.33%. The identified bacterial isolates can later be used as bioremediation agents on soils polluted with oil sludge. Keywords : Indigenous bacteria, Oil Sludge, Pseudomonas aeruginosa.
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