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: Pertumbuhan dan Kelangsungan Hidup Benih Ikan Lele Sangkuriang Diberi Hormon Pertumbuhan Rekombinan dengan Lama Perendaman Berbeda
Abstrak: Enhanced growth can highly contribute to the increased farming production. This research was conducted to compare the growth and survival of African catfish juvenile after immersion in water containing 2 mg/L recombinant giant grouper hormone (rElGH) for 2 and 4 hours. This research consisted of four treatments and three replications. A total of 100 catfish larvae at 5-day-old after hatching were hiperosmotic treated on 35 g/L salt solution for 2 minutes, and then bath immersed in a plastic packing containing 9 g/L salt solution, rElGH, and 100 mg/L bovine serum albumin (BSA). Control was created for each treatments and immersed in water containing 100 mg/L BSA. Fish were further maintained for 21 days in the aquarium, and fed on blood worm, ad libitum. The result showed that fish biomass of 4 hours treatment was approximately 25.12% higher compared to the control and 12.24% compared to 2 hours treatment. Fish survival in 4 hours treatment (60.0±8.3%) was higher than the 2 hours treatment (56.0±10.7%). Thus, the growth of Sangkuriang catfish seed can be improved by immersing in water containing rElGH during 4 hours, and this technology can be useful to improve African catfish farming.
Keyword: recombinant growth hormone., larval catfish, immersion

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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