Judul: Pengaruh Kejutan Salinitas dan Perendaman Larva dalam Larutan Tiroksin Terhadap Kinerja Calon Benih Ikan Patin Siam Pangasius hypophthalmus
Abstrak: There are some obstacles in Asian catfish juvenile production, especially outside the spawning season (May to September). It causes low quality of fish fry. Some manipulations are needed in order to improve the quality of juvenile. One of manipulation that can be done is hormone manipulation using thyroxin hormone and salinity shock. It was expected that thyroxin immersion and salinity shock will accelerate the larvae growth and development and also increase survival. Hormones were taken from thyrax tablet. The larvae that was used is newly hatched. The study consisted of 4 treatments and 3 replications using complete randomized design. Treatments consisted of a control, a dose of 0.05 ppm (P1), a dose of 0.1 ppm (P2), and a dose of 0.2 ppm (P3) for 1 hour immersion. Before larvae were immersed in hormone solution, a salinity shock of 20 ppt for 2 minutes were applied. Larvae was cultured in aquarium with density 40 larvae/l. The experiment was terminated at 12 days later. The result showed that larvae immersion in thyroxin solution and salinity shock 20 ppt promote the development, growth, and survival of Asian catfish larval, where dose of 0.05 ppm (P1) is the optimum level when viewed from efficiency and the economical perspective.
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Judul: Pengaruh hormon tiroksin (T4) dan hormon pertumbuhan rekombinan (rGH) terhadap pertumbuhan dan kelangsungan hidup larva Ikan Patin Siam ( Pangasianodon hypophthalmus)
Abstrak: Penelitian ini dilakukan untuk menguji perendaman larva dengan hormon tiroksin (T4) dan hormon rGH terhadap perkembangan larva, pertumbuhan, dan kelangsungan hidup ikan patin siam. Rancangan penelitian yang digunakan adalah rancangan acak lengkap dengan 4 perlakuan dan 5 kali ulangan. Perlakuan yang diterapkan yaitu perendaman larva pada kontrol, hormon tiroksin, hormon rGH, dan hormon tiroksin + rGH. Waktu perendaman yang diujikan yaitu selama 1 jam dengan dosis tiroksin 0,1 mg/L dan dosis rGH 5 mg/L. Data yang diamati meliputi perkembangan, pertumbuhan dan kelangsungan hidup larva, yang dipelihara selama 12 hari. Hasil menunjukkan bahwa pertumbuhan ikan perlakuan perendaman hormon tiroksin, rGH, tiroksin + rGH, dan kontrol berurut adalah 25,12 mm, 24,76 mm, 24,56 mm dan 20,62 mm (p<0,05) kelangsungan hidup 76,67%, 79,50%, 87,33%, dan 81,25% (p>0,05), untuk keragaman panjang total adalah 5%, 2,54%, 3,7%, dan 5,6%. Penggunaan hormon tiroksin, rGH, tiroksin + rGH berpengaruh terhadap pertumbuhan panjang dibandingkan dengan kontrol, tetapi tidak berpengaruh antar perlakuan hormon. Penggunaan hormon tidak berpengaruh terhadap kelangsungan hidup. Penggunaan hormon rGH memberikan keseragaman ukuran benih ikan patin siam ukuran 1 inci yang lebih tinggi dibanding perlakuan lain.
Keyword: Catfish, Thyroxine, rGH, Larval development, Growth in total length, Survival, Uniformity

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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