Judul: Pemberian Ekstrak Batang Pisang Ambon (Musa paradisiaca) pada Media Pemeliharaan untuk Meningkatkan Kelangsungan Hidup Larva Ikan Gurame (Osphronemus goramy)
Abstrak: Larva phase is a critical period in the life cycle of the fish so that mortality is very high in this phase. The sap of stem banana contains tannins, saponins and flavonoids that used as antiseptic. The purpose of this study was to determine the dose of extract stem of banana (Musa paradisiaca) to increase survival rate fry of Giant Gouramy (Osphronemus gouramy) in rearing media. Seven-day old larvae Giant Gouramy (0.75+0.05 cm length) were reared in an aquarium 50 x 30 x 25 cm with density 5 fry/l. The doses of extract 0; 0.04; 0.08 and 0.12 g/l treatment were reared for 29 days. Dose of 0,12 g/l showed the highest survival of 93.3%, it was significantly higher (p<0,05) than the other doses (0; 0.04 and 0.08 g/l doses were 17.8%, 21.9% and 24.4%, respectively). During the maintenance, gaint gouramy were acquired disease caused by the fungi Aphanomyces sp. In the extract stem of banana with dose 0.12 g/l could increase survival of Giant Gouramy fry.
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Judul: Efektivitas Perendaman Benih Ikan Gurame Osphronemus goramy dengan Ekstrak Pelepah Pisang Ambon Putih Musa paradisiaca untuk Pengendalian Infeksi Bakteri Aeromonas hydrophila
Abstrak: The purpose of this research was to determine the effectivity of immersion treatment on Giant Gouramy fry Osphronemus goramy with white banana stem Musa paradisiaca extract in controlling infection of Aeromonas hydrophila. Effectivity test of banana stem extract against the infection of A. hydrophila was performed through two different tests, in vitro and in vivo. In vitro test consisted of inhibition zone test with treatment dosages of 5%, 10%, 20%, 25% and 50%. Diameter size of each treatments were not significantly different (P>0.05). In vivo test consisted of 4 treatments, negative control, positive control, preventive, and curative. For preventive and curative treatments, immersion with banana stem extract was also performed with dosages of 5% and 10%. The results that banana stem extract significantly (P<0.05) showed the survival rate as much as 48.12% in the preventive treatment. However, the effects of banana stem immersion are not significantly different in curative treatment because it was only able to increase the survival rate as much as 37.04%. Preventive treatment was effective to control the infection of A. hydrophila
Keyword: goramy, banana stem extract, Aeromonas hydrophila

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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