Sterculia tragacantha Lindl. plants are endemic plants existing in Papua and have the potential of secondary metabolite compounds. This research aimed to determine the antioxidant activity and fatty acid composition of S. tragacantha Lindl. leaf extract. The extract was obtained by maceration using methanol and n-hexane solvents. The antioxidant activity testing was carried out using DPPH (1,1-diphenyl 2-picrylhydrazyl) free radicals while the identification of fatty acid compounds was done using Gas Chromatography-Mass Spectrometry (GCMS). The results showed that the methanol and n-hexane extracts of S. tragacantha Lindl. leaves had a strong antioxidant activity of 2.25 ±0,09 ppm and 27,24 ± 1,25 ppm respectively. Meanwhile, the fatty acid main contents of the methanol and n-hexane extracts of S. tragacantha Lindl. leaves were Methyl palmitate, Methyl linolenate, Linolelaidic acid methyl ester, trans-9-elaidic acid methyl ester, and Methyl palmitoleate.
Tujuan studi ini adalah untuk monitoring kualitas air yang di tambak udang vaname. Metode studi yang digunakan adalah deskriptif dengan analisis deskriptif kuantitatif. Metode deksriptif yang dilakukan dengan mengambil sampel dan observasi secara langsung di lokasi penelitian. Hasil pengamatan salinitas pada tambak petak 3, Petak 4 dan Petak 5 mengalami penuruan selama masa pemeliharan karena adanya penambahan air tawar di tambak. Monitoring konsentrasi TOM, alkalinitas dan pH selama masa pemeliharaan di petak tersebut masih dalam kadar optimum untuk pertumbuhan udang vaname. Pengukuran bakteri vibrio hijau dan kuning yakni sekitar 102-103. Jenis plankton yang paling banyak Nannokloropsis sp, Tetraselmis sp, Chlorella sp, Chetocero sp., Coscinodiscus sp, Oscilatoria sp, dan Isochrysis. Plankton tersebut termasuk yang disukai udang.
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