Judul: Karakteristik genotipe hibrida hasil persilangan 3 strain ikan nila Oreochromis niloticus dengan metode Random Amplified Polymorphic DNA (RAPD)
Abstrak: Objectives of this study were to observe the genetic variability and relationship among hybrids of three strains (BEST, Nirwana, and Red NIFI) using Random Amplified Polymorphic DNA (RAPD). The results showed that hybridization enabled to increase genetic variability respectedly on progeny between male Nirwana with female BEST (27.93%) as well as between male Nirwana with female Red NIFI (27.23%). Based on relationship analysis there were indication that Nirwana and Red NIFI were closer to the hybrid groups, compared to BEST one. The greatest genetic distance was the hybrids of Nirwana x BEST (0.6).
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Judul: Keragaan Hibrida Hasil Persilangan Intraspesifik Empat Populasi Ikan Nila Oreochromis niloticus Di Karamba Jaring Apung, Danau Lido, Bogor
Abstrak: Objectives of the study was to understand the performance of four strains (Red NIFI, Nirwana, Merah Lido, and BEST) nile tilapine hybrids based on the number of larvae produced, survival and growth rate, heterosis, morphometric character, and color inheritance aspect. Fry of 25 days old were reared in fine floating net cages sized 2x2x1 m for 8 weeks (56 days) with density of 50 fry per m3. Feed was given three times a day at 10% of total biomass. The results showed that the average production of larvae had the highest number from the hybrids or female Nirwana crossed with different male from other strains. For growth rate, hybrids showed better performance than the parent one (p<0,05), the best growth rate was between male Red NIFI x female BEST (6,44±0,07%). Survival rate had the best performance on male Merah lido x female BEST (77,00±2,78%). The best heterosis value was found 5,82% for spesific growth rate on the hybrids of male Nirwana x female BEST. Phenotypic similarity indicated that Red NIFI was separate a part from the others. Crossing between light (red color) and dark (black) background showed that light color gene was dominance over dark color one.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4