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: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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