Safitriani, Safitriani
Perhimpunan Biologi Indonesia

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Upaya Meningkatkan Hasil Belajar Matematika Dengan Strategi Pembelajaran Answer Stick Pada Peserta Didik Kelas IV SD Muhammadiyah Mandomai Tahun Pelajaran 2016/2017 Safitriani, Safitriani; Setyawan, Andi
Pedagogik: Jurnal Pendidikan Vol 12 No 2 (2017): Pedagogik: Jurnal Pendidikan
Publisher : ?Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (576.206 KB) | DOI: 10.33084/pedagogik.v12i2.857

Abstract

Penelitian ini bertujuan untuk mendeskripsikan aktivitas danmeningkatkan hasil belajar Matematika dengan menggunakan strategi pembelajaran answer stick. Jenis penelitian yang digunakan adalah Penelitian Tindakan Kelas (PTK). Subjek dalam penelitian ini adalah peserta didik kelas IV SD Muhammadiyah Mandomai. Teknik pengumpulan data yang digunakan adalah observasi dan tes sertaanalisis data adalahnilai rata-rata kelas dan persentase ketuntasan belajar klasikal. Hasil penelitian  menunjukan bahwa penerapan strategi pembelajaran answer stick dapat meningkatkan hasil belajar Matematikadengannilaiketuntasanklasikalyaitu 94 %.
Pertumbuhan Optimal Bakteri Laut Pseudomonas aeruginosa LBF-1-0132 dalam Senyawa Piren Safitriani, Safitriani; Thontowi, Ahmad; Yetti, Elvi; Suryani, Suryani; Yopi, Yopi
JURNAL BIOLOGI INDONESIA Vol 13, No 1 (2017): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (796.628 KB) | DOI: 10.14203/jbi.v13i1.3100

Abstract

ABSTRACTPyrene is a high molecular weight chemical compound belongs to polycyclic aromatic hydrocarbon (PAHs) group that are difficult to degrade by environment. Biodegradation techniques using indigenous marine bacteria are used to be as an effort to reduce pollutants that are carsinogenic. The objectives of this research are to screen of 18 marine bacteria isolates qualitatively by sublimation method and quantitatively by growth test and to optimize degradation activity of marine bacteria isolates by pyrene concentration and cell concentration. Identification by 16S rDNA and phylogenetic tree analysis were conducted to determine the molecular basis of bacterial identity. The result of sublimation showed that 15 isolates were positive result for pyrene degradation and classified to 3 groups. The first group consisted of 5 isolates that can produce clear zone, while the second group are 5 isolates with isolate color changes. The third group have both of activities. Growth test showed that isolate LBF-1-0132 has high potency to degrade pyrene compound. Isolate LBF-1-0132 is capable of degrading pyrene compounds optimally at concentration of 600 ppm and optimum cell concentration of 20. Based on 16S rDNA gene analysis, isolate LBF-1-0132 is Pseudomonas aeruginosa with 98% identity.Keywords :pyrene, marine bacteria, optimization, 16S rDNA identification