Judul: Optimasi Pemanfaatan Sumberdaya Perikanan Tangkap dan Budidaya Kerang Mutiara (Studi Kasus: Teluk Semangka Kabupaten Tanggamus)
Abstrak: The aim of this research are to study the optimum of fishery resource, economic value of spat cultivation and policy optimal allocation the use of resource for fishing and aquaculture. The sampling method used snowball method and purposive sampling for fishermen and for the spat cultivators is a census method. Types of data collected in this study consisted of two sources of data are primary data and secondary data. Semangka Bay resource of Tanggamus District has not been optimally utilized. Actual economic value of fishing in this bay is Rp6.660,200,000.00. The optimal value fishery with a dynamic approach is Rp370,814,200,000.00 in which Sardinella (Sardinella spp.) production could be increased up to 80.01 percent, 12.16 percent Teleosts (Leiognathidae spp.), Anchovies (Stolephorus spp.) 12.16 percent and 5.32 percent Cuvier (Rastrelliger spp.). Actual economic value of spat cultivation based on number of cage units are as follows (1) Rp1,432,379,615,561.00 for 12,340 units (2) Rp1,708,633,661,842.00 for 9,255 units (3) Rp 1,984,887,708,123.00 for 6,170 units and (4) Rp2,208,756,465,239.00 for 3,670 units. Results of policy analysis and optimum utilization of fisheries in the Bay of Semangka cultivation is the cultivation of exploiting the potential of 25 percent or 109.15 ha.
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Judul: Kajian Ekonomi Pemanfaatan Sumberdaya Perikanan Tangkap di Kabupaten Agam, Provinsi Sumatera Barat.
Abstrak: Tujuan penelitian ini adalah ingin mengkaji alokasi optimum pemanfaatan sumberdaya ikan Teri, Tongkol dan Tuna/Cakalang di Perairan Tanjung Mutiara Kabupaten Agam, Provinsi Sumatera Barat. Nilai optimum yang dihitung adalah tingkat produksi, jumlah upaya (effort) dan nilai manfaat atau rente sumberdaya ikan tersebut dengan masing-masing unit alat tangkap bagan, payang dan tonda, yang dominan digunakan oleh nelayan setempat. Fungsi pertumbuhan surplus produksi digunakan sebagai pendekatan penilaian alokasi optimum. Model ini menggunakan komponen harga dan biaya riil yang didekati dengan indeks harga konsumen (IHK). Parameter biologi r, q, dan K diestimasi dengan menggunakan model CYP (1992). Pemecahan analitik dengan menggunakan program MAPLE 9.5 terhadap sumberdaya ikan Teri, Tongkol dan Tuna/Cakalang dengan tingkat discount rate 29% diperoleh nilai optimal, untuk ikan teri optimal biomass (x*) sebesar 1.921,515 ton, optimal yield (h*) sebesar 1.563,95 ton, dan optimal effort (E*) sebanyak 2.709 trip dengan rente sumberdaya sebesar Rp2.886.878.358, rente overtime sebesar Rp9.920.544.186. Ikan tongkol optimal biomas (x*) sebesar 1.494,31 ton, optimal yield (h*) sebesar 537,43 ton, optimal effort (E*) sebanyak 3.495 trip dengan rente sumberdaya mencapai Rp1.300.705.855, rente overtime mencapai Rp4.469.779.570. Ikan tuna/cakalang, optimal biomass (x*) sebesar 838,65 ton, optimal yield (h*) sebesar 963,92 ton, optimal effort (E*) sebanyak 485 trip dengan rente sumberdaya sebesar Rp3.469.438.448 dan rente overtime mencapai Rp11.922.468.890. Hasil perhitungan alokasi optimum sumberdaya perikanan tangkap bagan, payang dan tonda ini menghasilkan banyaknya tangkapan optimal per trip yang boleh ditangkap dengan jumlah alat tangkap yang optimal yaitu sebanyak 21 unit alat tangkap bagan, 49 unit alat tangkap payang dan 19 unit alat tangkap tonda.
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Judul: Prenilasi Senyawa β-Diketon sebagai Prekursor 3-Prenilflavon
Abstrak: One group of flavonoids that has not been commonly synthesized is 3- prenylflavone. The main objective of this experiment was to synthesize precursor of 3-prenylflavone. Firstly, β-diketone was synthesized via 4 steps from phenol as starting compound with total yield of 24%. Prenylation of β-diketone with prenyl bromide and K2CO3 base produced 4 fractions which were separated by using preparative thin layer chromatography (PTLC) with n-hexane:EtOAc (8:2) as the eluent. Fraction with Rf = 0.80 was further separated by using preparative PTLC with n-hexane:EtOAc (99:1) as the eluent. Two fractions were obtained with Rf = 0.38 and 0.42. The first fraction has been characterized as diprenylated β-diketone with 49% yield. Application of protecting group on the phenolic OH group in β- diketone are needed to obtain monoprenylated β-diketone which can be further cyclized into 3-prenylflavone
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