Judul: Penentuan Dosis Perendaman Hormon Pertumbuhan Rekombinan Ikan Kerapu Kertang pada Pascalarva Udang Galah
Abstrak: This research was conducted to determine the immersion dose of recombinant giant grouper growth hormone (rElGH) that generates high growth performance in giant freshwater prawn. The study was consisted of 5 treatments with three replications. Those were immersion dose of 0.15 mg/L, 1.5 mg/L and 15 mg/L. As control post larval-35 (PL-35) was without treatment (control-1) and PL-35 was immersed in water containing 100 mg/L bovine serum albumin (BSA) without rElGH (control-2). In amount of 30 PL-35 for each treatment were bath immersed for 1 hour in a plastic packing containing 200 mL of water and 100 mg/L BSA. PL were further maintained for 12 weeks in the 30-L glass aquarium and fed flake form of commercial diet 3 times daily, at satiation. The results showed that the highest of biomass (58.77±1.98 gram), specific growth (6.85±0.01 % per day), average body weight (1.09±0.01 gram) and average total body length (5.09±1.01 cm) were obtained in 15 mg/L dose of treatment (p<0.05). Biomass of the prawn in 15 mg/L immersion dose was approximately 79.9% higher than control-1 (32.67±1.45 gram). Survival of prawn in all treatment and controls were similar (p>0.05). The prawn immersed with rElGH at a dose of 15 mg/L had 9.55% lower protein content, while lipid content was 6.33% higher than control. Thus, the immersion of PL in 15 mg/L rElGH could increase the growth of giant freshwater prawn, and can be useful to increase the aquaculture production.
Keyword: biomass, giant freshwater prawn pascalarvae, immersion dose, recombinant growth hormone

Judul: Respons benih ikan sidat terhadap hormon pertumbuhan rekombinan ikan kerapu kertang melalui perendaman dan oral
Abstrak: This study was aimed to determine an appropriate administration method and observe the response of eel fingerling on recombinant giant grouper growth hormone (rElGH). First study aimed to determine the immersion dose of rElGH to increase growth of eel juvenile (glass eel). After shock salinity treatment (NaCl 3% for 2 min), glass eel were immersed in water containing 0.9% NaCl, 0.01% bovine serum albumin, and different of dose of rElGH (0, 0.12, 1.2, 12 and 120 mg/L). The results showed that higher in growth body weight was obtained in treatment 12 mg/L (101.2±0.8), by increment of about 37.4% higher compared to that of control (72.93±1.8). Second study was aimed to determine the dose of rElGH mixed in artificial diet to increase growth of eel elver. HP55-coated rElGH was mixed to diet at different doses (0, 0.3, 3, and 30 mg/kg). Elver was fed on diet containing rElGH twice daily, 6% fish biomass. The result showed that higher in growth body weight was obtained in treatment 30 mg/kg (60.18±1.38), by increment of about 65.7% compared to control (36.32±0.97). Third study was aimed to compared of three administration method, namely immersion, oral, and combination of immersion and oral. The dosage of rElGH by immersion (12 mg/L) and oral administration (30 mg/kg feed) was obtained in previous study. Fish were maintained in 23-L glass aquaria for 120 days, at density of 45 fish per aquarium. The results showed that higher (P<0.05) biomass of harvest (73.68±2.07 g) was obtained in immersion and oral combination treatment, by increment of about 102.9% compared to control (36.32±0.97 g). Administration of rElGH also improved protein and lipid retentions by 142.5%, and 720% compared to that of control, respectively (P<0.05). In addition, rElGH treatment increased appetite, while artificial feed conversion ratio (4.75) was lower (P<0.05) by 55.15% compared to that of control (7.37). Combination of rElGH immersion and oral administrations also increased hepatosomatic index, reduced ammonia excretion and increased insuline-like growth factor-1/IGF-1 gene expression. Thus, rElGH administration via immersion and oral was a proper method to improve performance of eel fingerling, and application of rElGH can be useful to increase aquaculture production.
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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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