Judul: Penggunaan Albumin Serum Sapi dalam Perendaman Hormon Pertumbuhan Rekombinan pada Benih Ikan Gurami
Abstrak: Immersion of recombinant growth hormone can improve the growth of giant gourami juvenile. This research was conducted to examine the effectiveness of 0,12 mg/L recombinant Ephinepelus lanceolatus growth hormone (rElGH) immersion with and without bovine serum albumin (BSA). This study used a randomized complete design with 3 replicates and the treatment are 0,12 mg/L rElGH and BSA 100 mg/L (P1) compare with 0,12 mg/L rElGH without BSA (P2) and without rElGH without BSA (K) as control. Immersion was done for 1 hour, fish was then reared for 6 weeks and fed with tubifex with ad libitum. The result showed that rElGH treatment without BSA was not significantly affected body weight, biomass, and spesific growth rate (P>0,05) while the immersion of rElGH with BSA could increased 113.12% biomass compared to the rElGH immersion without BSA. Immersion of recombinant growth hormone to improve growth of giant gourami juvenile without BSA is not effective.
Keyword: giant gourami., immersion, BSA, recombinant growth hormone, rElGH

Judul: Kinerja Pertumbuhan Benih Ikan Gurame yang Diberi Perendaman Hormon Pertumbuhan Rekombinan dengan Masa Pemeliharaan Berbeda di Akuarium.
Abstrak: Slow growth of giant gourami became the main problem in cultivation of this commodity. Long rearing period surely would increase the risk and cost of production. Therefore, a technology is required to enhance growth rate of giant gourami. The aims of this experiment were to analyse growth performance of giant gourami to the recombinant giant gourami growth hormone (rOgGH) immersion at a dose of 120 mg/L for 60 minutes at juvenile stage and to evaluate the proper aquarium-rearing period. After immersed, fish were reared in aquarium for 2 weeks, 3 weeks and 4 weeks before moved to fish pond (aquarium-rearing period became the second factor on this experiment, in term to design a proper method to apply this technology). There were 3 replications for every treatment. RT-PCR analysis showed that IGF-I mRNA expression level increased just after rOgGH immersion about 208,3% compared with control. However, lipase analysis showed no differences between treated fish and control fish that is 0,055 unit/minute.g body weight and 0,053 unit/minute.g body weight for each group. Furthermore, treatment of rOgGH also altered the utilization of dietary and stored lipid, protein and carbohydrates. The results showed significant differences (P<0,05) for nutrient retention between treated fish and control fish. Fish that immersed by rOgGH had higher fat retention (15,92±0,37%) if compared with the control BSA fish (6,52±0,38%). Immersion treatment with rOgGH also had a higher protein retention that was 23,58±2,33% compared with BSA control fish 19,75±1,00%. Immersion treatment with rOgGH had a lower carbohydrate retention that was 2,86±0,21% if compared with BSA control 10,63±0,92%. Observation to feed efficiency value showed that immersion in rOgGH had no statistically significant affect (P>0,05) compared with BSA control for 3 types of feed. For tubifex worms, the feed efficiency value that reached was 14,8±5,6% (rOgGH) and 12,7±5,0% (BSA). So that crumble feed, 51,6±17,8% (rOgGH) and 41,9±13,6% (BSA), for small feed (2mm) 66,8±9,0% (rOgGH) and 54,8±10,0% (BSA). Treatment that gave a significant affect was aquarium-rearing period, it showed that fish which reared in aquarium for 2 weeks had a higher feed efficiency value for tubivex worm and crumble feed that were ,7±2,8% and 60,5±7% if compared with fish which reared in aquarium for 3 and 4 weeks with efficiency value for each were 15,6±2,1% and 7,9±4,4% for tubifex worms and 30,7±5,0% and 49,0±16,5% for crumble feed. Growth acceleration were expected in this immersion treatment, but results showed that there were no differences between rOgGH treated fish and BSA control fish (8,7±0,3% and 8,4±0,3%). Aquarium-rearing period seemed to be the effecting-factor which gave significant affect (P<0,05) to fish growth, it showed that fish that reared in aquarium for 2 weeks had a faster growth that was 8,7±0,2% if compared with fish that reared in aquarium for 3 and 4 weeks (8,3±0,1% and 8,6±0,5% for each group). Results also showed that immersion in rOgGH had no significant affect (P>0,05) if compared with BSA control for survival rate (58,9±17,9% and 57,9±14,6% for each group). Aquarium-rearing period seemed to have significant affect (P<0,05) for survival rate which fish that reared in aquarium for 2 weeks had a higher survival
Keyword: recombinant growth hormone, immersion, rearing period, growth, metabolic pathways, giant gourami

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
Keyword: