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Effects of Nitrate and Salinity on Fatty Acid Composition of Marine Tetraselmis sp.: Potential as Biodiesel Noriko, Nita; Prayitno, Joko; Anggraini, Bunga
Makara Journal of Science Vol. 19, No. 1
Publisher : UI Scholars Hub

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Abstract

Identifying sources of renewable energy is extremely important. The potential of Tetraselmis sp. in biodiesel production was investigated using a completely randomized design with four treatments. Tetraselmis sp. was cultured on media containing different concentrations of nitrate there are 2 mM and 15 Mm and s 25 ‰ and 35 ‰ salinity. The treatments namely are (N2S25), (N2S35), N15S25) and (N15S35). Analysis of the fatty acid content using gas chromatography-mass spectrometry (GC-MS). The results showed that the highest growth occurred in culture that contained 15 mM of nitrate and 35 ‰ salinity. The lowest growth occurred in culture containing 2 mM of nitrate and 25‰ of salinity. The highest lipid content was found in cultures containing 2 mM of nitrate and 25‰ salinity, it is 34.83%. Seven fatty acids were detected in culture containing 2 mM of nitrate and 25‰ salinity namely myristic acid (4.02%), palmitic acid (40.59%), palmitoleic acid (29.06%), stearic acid (0.95%), oleic acid (12.52%), gamma-linolenic acid (2.56%), and arachidonic acid (9.38%). Four fatty acids palmitoleic acid (8.99%), palmitic acid (37.34%), oleic acid(44.89%), and stearic acid (8.78%) were detected in 2 mM of nitrate with 35‰ salinity. The fatty acids have potential to be used as raw material for biodiesel production.
PENERAPAN PEMBELAJARAN DARING BERBASIS GOOGLE MEET TERHADAP PEMAHAMAN KONSEP SISWA PADA MATERI GERAK LURUS KELAS X SMA YAPIM TARUNA STABAT Zahara, Syarifa Rita; Anggraini, Bunga; Syafrizal, Syafrizal
Relativitas: Jurnal Riset Inovasi Pembelajaran Fisika Vol. 7 No. 1 (2024): Jurnal Riset Inovasi Pembelajaran Fisika
Publisher : Department of Physics Education, Faculty of Teacher Training and Education, UNIVERSITAS MA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/relativitas.v7i1.5666

Abstract

Penelitian ini bertujuan untuk mengetahui penerapan pembelajaran daring berbasis google meet terhadap pemahaman konsep siswa pada materi gerak lurus kelas X SMA Yapim Taruna Stabat. Penelitian ini merupakan penelitian quasi eksperimental design. Penelitian ini dilakukan pada bulan agustus tahun 2021. Teknik pengambilan sampel yaitu dengan teknik purposive sampling dimana siswa kelas X MIA 1 sebagai kelas kontrol dengan jumlah siswa 20 orang dan siswa kelas X MIA 2 sebagai kelas eksperimen dengan jumlah siswa 20 orang. Kelas kontrol dengan perlakuan menggunakan google classroom dan group whatsapp sedangkan kelas eksperimen menggunakan google meet dan group whatsapp pada saat proses pembelajaran. Desain yang digunakan dalam penelitian ini adalah nonequivalent control group desains. Instrumen pengumpulan data menggunakan soal pilihan ganda. Data yang diperoleh dianalisis menggunakan SPSS versi 20. Untuk menguji hipotesis menggunakan uji Mann-Whitney test. Analisis data dilakukan secara deskriptif kuantitatif. Berdasarkan hasil penelitian menunjukkan bahwa nilai  rata-rata  post-test eksperimen yaitu 79,25 dan nilai rata-rata post-test kontrol yaitu 66. Besar uji non parametrik diperoleh hasil 0,000 < 0.05 sehingga dapat disimpulkan penerapan pembelajaran berbasis google meet dapat meningkatkan pemahaman konsep siswa.
PENTAHELIX-BASED MSME DEVELOPMENT STRATEGY TO REDUCE THE UNEMPLOYMENT RATE IN TEBING TINGGI CITY Anggraini, Bunga; Syahbudi, Muhammad; Yanti, Nursantri
Jurnal Pamator : Jurnal Ilmiah Universitas Trunojoyo Vol 18, No 4: October - December 2025
Publisher : LPPM Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/pamator.v18i4.32062

Abstract

This study aims to formulate a development strategy for Micro, Small, and Medium Enterprises (MSMEs) based on the Pentahelix approach to reduce unemployment in Tebing Tinggi City. The Pentahelix approach involves five main elements: academics, businesses, communities, government, and mentors, who collaborate in the local economic development process. The methodology is a qualitative one, including statistical data, questionnaires, in-depth interviews, document analysis, and observation as data collecting methods. The strategy is analyzed using the SOAR (Strengths, Opportunities, Aspirations, Results) framework and the Triple Bottom Line (TBL) principle, which includes social (people), environmental (planet), and economic (profit) aspects. The analysis results show that the combination strategy of Opportunities + Aspirations (OA) is the most optimal approach, with the highest score in the IFAS and EFAS analyses. The OA strategy is considered capable of utilizing external opportunities such as technological innovation, strategic partnerships, community collaboration, and policy support, to realize the aspirations of sustainable community economic empowerment. These findings demonstrate the importance of cross-sector collaboration in encouraging MSME growth as a strategic solution to reduce unemployment in the region.Keywords: MSMEs, Pentahelix, Unemployment, SOAR