Judul: Masculinization of Betta Fish (Betta splendens) throught larval Immersion Method Using Forest Honey
Abstrak: Betta fish is freshwater fish with characteristic of being happy to compete. The beauty of the color, shape and pattern of fish is special attraction so that it has high selling value, especially in males. Reversal sex through masculinization techniques, is able to produce higher study ratio. This study aims to test effectiveness of immersion betta fish (B. splendens) larval stage in honey solution and study its effect on fish survival. This study used complete randomized design (RAL) method with one factor in the form of immersion time. There were five lengths of immersion as treatment, 0 hours (Control), 24 hours (P1), 28 hours (P2), 32 hours (P3) and 36 hours (P4) with 3 tests each. Larvae used are aged 3 days after hatching. The results showed that length of soaking had a significant (P<0.05) on survival rates in all treatments. The percentage of male sex observed in the K treatment was 21,66±4,81%, P1 was 50,85±2,92%, P2 was 50,58±4,59%, P3 was 52,46±3,90% and P4 was 0%. The effective soaking time treatment is for 24 hours. The effect of natural honey on the masculinization of betta fish was effective in P1 treatment of 50,85±2,92% and survival rate of 94,95±1,37%., Ikan cupang adalah ikan air tawar dengan karakteristik senang berlaga dengan sesama jenisnya. Keindahan warna, bentuk dan corak ikan menjadi daya tarik tersendiri sehingga mempunyai nilai jual tinggi terutama pada jantan. Seks reversal melalui teknik maskulinisasi, mampu menghasilkan rasio pejantan menjadi lebih tinggi. Penelitian ini bertujuan menguji efektivitas waktu perendaman ikan cupang (B. splendens) stadia larva didalam larutan madu serta mempelajari pengaruhnya terhadap kelangsungan hidup ikan. Penelitian ini menggunakan metode rancangan acak lengkap (RAL) dengan satu faktor berupa lama waktu perendaman. Terdapat lima lama perendaman sebagai perlakuan yaitu 0 jam (K), 24 jam (P1), 28 jam (P2), 32 jam (P3), 36 jam (P4) dengan masing-masing 3 ulangan. Larva yang digunakan berumur 3 hari setelah menetas. Hasil penelitian menunjukan bahwa lama perendaman berpengaruh nyata (P<0,05) terhadap tingkat kelangsungan hidup pada semua perlakuan. Persentase kelamin jantan yang teramati pada perlakuan K sebesar 21,66±4,81%, P1 sebesar 50,85±2,92%, P2 sebesar 50,58±4,59%, P3 sebesar 52,46±3,90% dan P4 sebesar 0%. Perlakuan waktu perendaman yang efektif yaitu selama 24 jam. Pengaruh madu pada maskulinisasi ikan cupang efektif pada perlakuan P1 sebesar 50,85±2,92% dan tingkat kelangsungan hidup sebesar 94,95±1,37%.
Keyword: daya tarik, efektivitas, seks reversal, waktu perendaman

Judul: Maskulinisasi Ikan Cupang (Betta splendens) Melalui Perendaman Embrio dalam Ekstrak Purwoceng (Pimpinella alpina)
Abstrak: This study aimed to know the effect of extract of P. alpina for masculinization of Betta splendens. This research used the Completely Randomized Design with 3 treatments that were distinguished by doses of extract of P. alpina, those are 10, 20, and 30 μL/L, and 0 μL/L as control. The treatments are given to 35 embryos by immersion in extract of Pimpinella alpina when eye spots phase or about 28th hour after fertilization. The immersion process was done for 8 hours. The result showed that 20 μL/L dose of P. alpina’s extract produced male fish percentage 62,66%, it’s higher than control (45,91%), and hatching rate was 85,71%. At the higher dose (30 μL/L), male fish population and hatching rate went down with each value 39,72% and 68,57%.
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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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