Judul: Dinamika Komunitas Plankton di Kolam Pendederan Ikan Tengadak (Barbonymus schwanenfeldii)
Abstrak: Plankton both phytoplankton and zooplankton is one of essential factor to establishing the success of aquaculture. Artificial feeding in aquaculture may affects the condition of plankton. The plankton can give positive or negative impact to the survival of fish like Tengadak (Barbonymus schwanenfeldii). Plankton observations are expected to provide information about the dynamics of plankton during the fish maintenance. The results of this study indicate that the phytoplankton was dominated by class of Chlorophyceae and the zooplankton was dominated by Rotifera. The value of diversity index tend to moderate, with the value of eveness index tend to high and value of dominance index tend to low for both phytoplankton and zooplankton. Statistical test results by SPSS program showed that the effect of feeding treatment did not affect the composition and abundance of plankton class. In this study, harmful plankton was not found, and was not affected the survival of Tengadak (B. schwanenfeldii).
Keyword: Tengadak (Barbonymus schwanenfeldiii), Plankton, Artificial feed

Judul: Dinamika Kualitas Air Pada Kolam Pemeliharaan Ikan Tengadak (Barbonymus schwanenfeldii Bleeker, 1854)
Abstrak: Tinfoil barb is a freshwater species, which population has been declining because of catch and environmental pollution. An attempt to keep this population is by aquaculture or cultivation. Good water quality was strongly influenced by the optimization of cultivation. This research was aimed to determine the dynamics of water quality and pollution level during cultivation. The research was conducted on nine ponds consisting of three treatments (feeding of 3%, 6%, and 9% of total biomass) with each of three replicates. During the research, the temperature ranged between 22,8 to 26,3 °C; transparancy between 16 to 46 cm; the colours was green to brown; pH between 6,46 to 7,74; DO between 0,7 to 5,29 mg/L; alcalinity between 31,85 to 104,7 mg/L; nitrite between 0 to 0,393mg/L; nitrate between 0,14 to 0,637 mg/L; ammonia between 0,0006 to 0,01 mg/L; ortophosphate between 0 to 0,343 mg/L. Ciapus River water used as an input for the culture had a good pollution level and moderate pollution level. The best water quality was found in feeding of 3% and the best growth rate was found in feeding of 9%.
Keyword: pollution, water quality, tinfoil barb

Judul: Pembuatan Isoeugenol dari Eugenol Menggunakan Pemanasan Gelombang Mikro
Abstrak: Indonesia merupakan salah satu penghasil minyak cengkeh terbesar di dunia. Pasokan minyak cengkeh Indonesia ke pasar dunia mencapai 60% kebutuhan dunia. Pada tahun 2000, dari 2,080 ton minyak cengkeh yang dipasarkan, Indonesia memasok 1,317 ton (Deptan, 2005). Di negara-negara industri seperti Amerika Serikat, Perancis, Jerman, Italia, dan Inggris, minyak cengkeh digunakan sebagai bahan baku untuk membuat isolat eugenol dan derivatnya seperti isoeugenol dengan nilai tambah yang lebih tinggi. Harga eugenol sebesar Rp 75 000/kg, harga isoeugenol sebesar Rp 95 000/kg (Indesso, 2006) sedangkan harga minyak daun cengkeh Indonesia di pasar Internasional sekitar Rp 25 000/kg (Deptan, 2005). Isoeugenol merupakan senyawa yang banyak digunakan sebagai campuran dalam fragrances dan dalam produk-produk konsumsi harian seperti parfum, produk perawatan kulit, deodoran, sabun, shampo, deterjen serta sebagai bahan intermediet dalam produksi vanilin sintetik. Isoeugenol dihasilkan dari reaksi isomerisasi eugenol. Reaksi isomerisasi eugenol umumnya dilakukan dengan cara mereaksikan eugenol dalam larutan basa KOH atau NaOH pada suhu tinggi selama 5 – 7 jam (Cerveny et al., 1987). Lamanya waktu pemanasan konvensional ini diduga dapat dipersingkat dengan menggunakan pemanasan gelombang mikro. Aplikasi katalis basa yang membutuhkan jumlah yang berlebih dalam reaksi isomerisasi juga dapat digantikan dengan menggunakan katalis RhCl3.3H2O dalam jumlah yang lebih rendah (Chalk, 1977).
Keyword: