Judul: Penentuan pH Optimum untuk Pertumbuhan Kepiting Bakau Scylla serrata dalam Wadah Terkontrol
Abstrak: One of the abiotic factors that affects the growth and the survival of crabs is pH. The optimum pH media will give maximum impact on mangrove crabs because it is related with the osmoregulation process. This study aimed to examine the effect of pH on the survival rate (SR) and spesific growth rate (SGR) of Mangrove Crab (Scylla serrata) through the reaction of physiological condition. This study consisted of the treatments with the pH medium 5, pH medium 6, pH medium 7, and pH medium 8. The crab’smaintenance in different pH gave a significant effect (p < 0.05) on the survival rate of the crabs. The pH treatments also gave a significant effect (p < 0.05) on the Spesific Growth Rate (SGR) of the crabs. The low level of crab’s stress at pH 7 was described by the total value of high hemocyte and the high osmotic load so that the pH 7 was the optimum condition for the crabs.
Keyword: pH., specific growth rate, mangrove crabs, survival rate

Judul: Penentuan Suhu Optimum untuk Meningkatkan Kelangsungan Hidup dan Pertumbuhan Benih Kepiting Bakau Scylla serrata (Forskal) pada Media dengan Sistem Resirkulasi
Abstrak: Supply of mud crab depand on nature stock because crab culture activities and cultivation technology is still limited, so that the exploitation of natural crab was in uncontrolled. In addition, the high mortality due to cannibalism is still the dominant factor affecting the maintenance of mud crab production, both in the larvae and post-larvae stage. A research aimed to examine the effect of temperature on the survival rate and growth rate of mud crab. The research had been done on April 2014 in the Laboratory of Aquatic Animal Physiology, Faculty of Fisheries and Marine Science, Bogor Agricultural University. The treatments consisted of the temperature medium 25±0,21oC (A), 27±0,15oC (B), 29±0,21oC (C), and 31±0,21oC (D). The mud crabs measuring of 90±2,02 g/fish were reared in an container with circulation system with a density of 8 fish/container during 28 days. The results showed that the mud crab were reared on different temperatures had a significant effect (p <0.05) on the survival rate and growth rate of mud crab. The temperature of 29±0,21oC was the optimum temperature for mud crab.
Keyword: Bogor Agricultural University (IPB), Mud crab., Growth rate, Survival rate, Temperature

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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