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All Journal HAYATI Journal of Biosciences Jurnal Online Mahasiswa (JOM) Bidang Keguruan dan Ilmu Pendidikan
Tatik Lestari, Tatik
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education

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PENERAPAN STRATEGI THINK TALK WRITE DALAM MODEL PEMBELAJARAN KOOPERATIF UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS X.4 SMA NEGERI 7 PEKANBARU Lestari, Tatik
Jurnal Online Mahasiswa (JOM) Bidang Keguruan dan Ilmu Pendidikan Vol 3, No 1 (2016): Wisuda Februari 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Keguruan dan Ilmu Pendidikan

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Abstract

Abstract: The purpose of this research is to improve mathematics achievement by applying think talk write strategy in the cooperative learning. The research is classroom action research. The subject of this research is students of class X.4 SMAN 7 Pekanbaru in the second semester academic years 2014/2015, there are 32 students in the class, consist of 12 boys and 20 girls. This research is exercised in two cycles, and at the end of every cycle carried out mathematics achievement test. Data collecting through observation and written test. The observation was doing for the observation of learning activity of teacher and student. Base on the resultof analysis, the amount of students that reaching KKM interest improves from 40,6% at early score and become 50,0% at the first cycle and become 65,6% at the second cycle. The result of research conclude that applying think talk write strategy in the cooperative learning can improves mathematics achievement X.4 SMAN 7 Pekanbaru in the second semester academic years 2014/2015.Key Word : Mathematics learning outcome, Think talk write strategy in the cooperative learning, Classroom Action Research.
Chemical Components of Essential Oils from Woods of Cinnamomum burmanii (Ness) BL, Santalum album Linn., and Cryptocarya massoia (Oken) Kosterm and Their Application as Antibacterial Additives in Transparent Herbal Soaps Ariani, Sri Retno Dwi; Lestari, Tatik
HAYATI Journal of Biosciences Vol. 32 No. 3 (2025): May 2025
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.32.3.632-641

Abstract

This study aimed to isolate and identify the chemical components of essential oils from woods of cinnamon (Cinnamomum burmanii (Ness) BL), sandalwood (Santalum album Linn.), and massoia (Cryptocarya massoia (Oken) Kosterm) and to determine their effect as additives for transparent herbal soap in terms of their antibacterial activity against Staphylococcus aureus ATTC 25923 and the soap quality. The results showed that cinnamon, sandalwood, and massoia essential oils contained, respectively, 14, 20, and 9 chemical components, all of which had been identified. The chemical components with the highest percentage contained in the essential oils of cinnamon, sandalwood, and massoia were cinnamaldehyde (91.71%), β-bisabolen (37.79%), and massoia lactone (77.56%), respectively. The soaps’ antibacterial activity against S. aureus ATTC 25923 increased from moderate (with an inhibitory power of 9.67 mm) to strong. The addition of 3% massoia essential oil got the highest inhibitory power of 16.47 mm (strong), followed by that of 3% cinnamon essential oil and 3% sandalwood essential oil, getting 15.37 mm and 12.19 mm, respectively, both of which were considered strong as well. The results of the organoleptic description test showed that each soap had a distinctive color and aroma depending on the type of essential oil added. The quality test results, including transparency, pH, foam stability, water content, and saponification number, indicated that the formulation had good quality.
Co-Authors Sri Retno Dwi Ariani