Judul: Komposisi Proksimat, Asam Lemak, dan Perkembangan Jaringan Daging Baby Fish Ikan Nila (Oreochromis niloticus) pada Berbagai Umur Panen
Abstrak: Baby fish tilapias are mostly consumed by people of West Java in so many food process; however, there is only few information about chemistry composition of fresh baby fish tilapia. The purposes of this research are to determine proximate, fatty acid and to analyze fresh baby fish nila’s tissue at the harvesting time of two, three, and four weeks. The method that’s used to analyze proximate based on SNI, fatty acid based on GC, and tissue analysis using fixation, dehydration, clearing, impregnation, embedding, blocking, trimming, cutting, and staining method. Harvesting time of two, three, and four weeks has a significant effect (P<0.05) of morphometric, chemical composition, and fatty acids content. Weight, total length, and height increased significantly (P<0.05) at ranged of 2-4 weeks. Moisture, protein and lipid contents decreased significantly (P<0.05). Ash and carbohydrate contents increased significantly (P<0.05) at ranged of 2-4 weeks. Baby fish tilapias consist total fatty acids at harvesting time of 2 weeks 99.13%, 3 weeks 75.36%, and 4 weeks 56.51%. Total fatty acids decreased significantly (P<0.05) during 2-4 weeks.
Keyword: tissue, proximate, harvesting time, fatty acid, Baby fish tilapias

Judul: Profil Asam Amino dan Jaringan Baby Fish Nila (Orechromis niloticus) pada Umur Panen yang Berbeda
Abstrak: Baby tilapia is easily obtained fish and be the current trend as food source. The purpose of this research was to determine the chemical and amino acid contents, and to observe the tissue in fresh baby tilapia fish at the range of 2-4 weeks age. The method of amino acid analysis used HPLC and tissue analysis used parafin. Chemical content of each age tend identical, ash and carbohydrate content increased significantly during 2-4 weeks. Glutamic acid composition was the highest of non esential amino acid in baby tilapia fish (7.75%; 7.17%; 6.7%). The highest esential amino acid was leusin (3.97%; 3.65%; 3.42%). Baby tilapia tissue showed that the muscle structure consists of ephitel, myomere, notochord, and myoseptum. Myomere in 2 week relatively small and less than 3 weeks and 4 weeks. Villi and mucus cells at 2 weeks developed, but has not appeared on the enterocyte cell.
Keyword: tissue,., proximate, baby tilapia, amino acid, age

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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