Judul: Perendaman Benih Ikan Lele dalam Larutan Hormon Pertumbuhan Rekombinan Ikan Kerapu Kertang dengan Kepadatan Tinggi.
Abstrak: Teknologi perendaman hormon pertumbuhan rekombinan pada ikan lele untuk memacu pertumbuhan belum banyak dilakukan. Penelitian ini bertujuan untuk mengevaluasi pertumbuhan dan kelangsungan hidup ikan lele melalui teknologi perendaman hormon pertumbuhan dari ikan kerapu kertang (rElGH) dengan dosis 2 mg/L pada padat perendaman tinggi, yakni 300 ekor/100 ml. Benih ikan lele yang berumur 5 hari pascamenetas direndam dalam air mengandung rElGH selama 2 jam, dan kemudian dipelihara selama 5 minggu. Data yang dihasilkan diolah menggunakan Microsoft Excel 2007 dan dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa bobot rataan ikan lele perlakuan rElGH lebih besar 20,40% dari kontrol, biomassa sebesar 51,27% dan kelangsungan hidup perlakuan (67,33%) menunjukkan lebih besar 14,5% daripada kontrol (52,83%). Konversi pakan alami berupa cacing tubifex sebesar 2,31 sedangkan kontrol sebesar 2,33 dan konversi pakan komersial untuk perlakuan sebesar 0,97 dan kontrol sebesar 1,13. Dengan demikian perendaman hormon pertumbuhan rekombinan dengan kepadatan tinggi 300 ekor/100 ml dapat meningkatkan pertumbuhan dan kelangsungan hidup ikan lele, serta dapat meningkatkan efisiensi perendaman rElGH terhadap larva ikan lele.
Keyword: hormon pertumbuhan rekombinan, ikan lele, padat perendaman tinggi, pertumbuhan

Judul: Penentuan Dosis Hormon Pertumbuhan Rekombinan Ikan Kerapu Kertang Pada Larva Ikan Lele Sangkuriang Melalui Perendaman
Abstrak: Growth and survival rate are the main factor determining the productivity of aquaculture. This research was conducted to obtain the dose of recombinant giant grouper growth hormone (rElGH) that generates highest growth and survival rate of Sangkuriang catfish at larval stage through immersion. The research used a completely randomized design and consisted of four treatments with three replications. The dose of rElGH used was 0 (control), 0.2 mg/L, 2.0 mg/L and 20.0 mg/L. rElGH was dissolved in 100 mL water containing 9 g/L salt solution and 100 mg/L bovine serum albumin. A total of 100 larvae at 5 days after hatching were hiperosmotic treated on 35 g/L salt solution for 2 minutes, and then immersed into 100 mL of rElGH solution for 1 hour. Fish were reared for 21 days and fed on blood worm ad libitum. The results showed that biomass and survival rate of 2 mg/L rElGH treated fish was 49.60% and 47.67% higher than control, respectively. Thus, the biomass of Sangkuriang catfish seed can be improved by immersing in water containing 2 mg/L rElGH, and it is potentially high to be used in order to increase aquaculture production.
Keyword: immersion., recombinant growth hormone, larval catfish

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology