Judul: Pertumbuhan dan Kelangsungan Hidup Benih Ikan Lele Sangkuriang Diberi Hormon Pertumbuhan Rekombinan dengan Lama Perendaman Berbeda
Abstrak: Enhanced growth can highly contribute to the increased farming production. This research was conducted to compare the growth and survival of African catfish juvenile after immersion in water containing 2 mg/L recombinant giant grouper hormone (rElGH) for 2 and 4 hours. This research consisted of four treatments and three replications. A total of 100 catfish larvae at 5-day-old after hatching were hiperosmotic treated on 35 g/L salt solution for 2 minutes, and then bath immersed in a plastic packing containing 9 g/L salt solution, rElGH, and 100 mg/L bovine serum albumin (BSA). Control was created for each treatments and immersed in water containing 100 mg/L BSA. Fish were further maintained for 21 days in the aquarium, and fed on blood worm, ad libitum. The result showed that fish biomass of 4 hours treatment was approximately 25.12% higher compared to the control and 12.24% compared to 2 hours treatment. Fish survival in 4 hours treatment (60.0±8.3%) was higher than the 2 hours treatment (56.0±10.7%). Thus, the growth of Sangkuriang catfish seed can be improved by immersing in water containing rElGH during 4 hours, and this technology can be useful to improve African catfish farming.
Keyword: recombinant growth hormone., larval catfish, immersion

Judul: Pertumbuhan dan Kelangsungan Hidup Ikan Betok yang Direndam Hormon Pertumbuhan Ikan Kerapu Kertang Rekombinan dengan Dosis Berbeda pada Umur 12 Hari.
Abstrak: The study was conducted to determine the effectiveness of recombinant giant grouper growth hormone (rElGH) applied to 12-day-old climbing perch by immersion at different doses. The effectiveness test based on growth and survival rates were performed by four different rElGH doses; 0, 3, 6, and 12 mg/L in triplicates. Before immersion process was conducted, the fish were shocked in 3% saline solution for 2 minutes. Then immersion was conducted for 2 hours in rElGH solution. That solution was made by mixing the BSA 0.01% and rElGH in 0.5% saline water. The result showed that immersed juvenile fish in 12 mg/L rElGH dose increased 4% of biomass than controls.
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Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa