Judul: The growth performance and viability enhancement of humpback grouper (Cromileptes altivelis) fed on selenium supplementation
Abstrak: This study was conducted to evaluate the effects of different levels and sources of selenium (Se) on the growth performance and viability of juvenile humpback grouper (Cromileptes altivelis). The experiments were arranged and conducted in four stages. The first experiment was conducted to compare the digestibility of dietary Se from sodium selenite and selenometionin. Two groups of grouper were given the experimental diets for 14 days. The result of this experiment showed that selenometionin was more digestible (68,68%) than sodium selenite (60,36%). In experiment 2, two different sources of Se at varying concentrations were added to the basal diet (sodium selenite at 0,5; 1; 2; and 4 mg Se/kg diet, and selenometionin at 1; 2; and 4 mg Se/kg diet, respectively). Another treatment was unsupplemented Se. Of the treatments, selenometionin supplementation with dose of 4 mg Se/kg diet showed a better performance than other diets. The addition of sodium selenite with dose of 0,5 mg Se/kg diet showed a toxic effects. In experiment 3, pelleted diets with 0; 0,025; 0,05; 0,1; 0,2; and 0,4 mg Se/kg diet from sodium selenite were used to fed triplicate groups of fish twice a day at satiation (mean initial length and weight: 5,83+0,28 cm and 3,47+0,43 g, respectively) in a 90x40x35 cm aquaria. The experimental fish were reared for 42 days at a density of 15 ind./aquarium. At the end of the experiment, fish were dipped in fresh water for 10 minutes and no aeration was added. The addition of sodium selenite with dose of 0,05 mg Se/kg diet enhanced growth performance and viability of juvenile humpback grouper. The last experiment was conducted to evaluate the effects of different levels of selenometionin on the growth and viability of juvenile humpback grouper. In this experiment, pelleted diets with 0; 4; and 16 mg Se/kg diet from selenometionin were used to fed triplicate groups of fish twice a day at satiation. The experimental fish were reared for 42 days at a density of 15 ind./aquarium. At the end of the rearing period, fish were transported for 13 hours and then reared again for 20 days. At the second week of the continued rearing period, fish were dipped in fresh water for 10 minutes and no aeration was added. The studies showed that the addition of selenometionin at a concentration of 4 mg Se/kg diet enhanced growth performance and viability of juvenile humpback grouper.
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Judul: Growth Response, Biochemical Composition and Innate Immunity of the Juvenile Humpback Grouper after Treatment with Recombinant Growth Hormone.
Abstrak: Ikan kerapu bebek Cromileptes altivelis (Valenciennes, 1828) adalah salah satu jenis ikan laut bernilai ekonomi tinggi untuk ekspor ikan hidup yang dibudidayakan di Indonesia. Problem utama budidaya ikan kerapu bebek adalah pertumbuhannya yang lambat, sehingga perlu upaya mempercepat pertumbuhannya untuk efisiensi ongkos produksi dan menekan risiko kegagalan. Seiring dengan berkembangnya bioteknologi modern, pertumbuhan dapat dipercepat dengan memanfaatkan hormon pertumbuhan rekombinan. Penelitian ini bertujuan untuk menguji respons pertumbuhan, komposisi biokimia dan imunitas bawaan benih ikan kerapu bebek setelah perlakuan hormon pertumbuhan rekombinan ikan kerapu kertang Epinephelus lanceolatus (rElGH)., The humpback grouper Cromileptes altivelis (Valenciennes, 1828) is one of the most expensive marine fish cultured in Indonesia. The main problem encountered in the culture of this species is its low growth rate, therefore effort to fastening growth rate was needed for making aquaculture more efficient in terms of minimizing cost production and risk. With the development of modern biotechnology, growth has been improved through the use of various preparations of exogenous homologous or heterologous growth hormone (GH). In the present study, we investigated the growth response, biochemical composition and innate immunity of the juvenile humpback grouper after treatment with recombinant Epinephelus lanceolatus growth hormone (rElGH).
Keyword: growth, rElGH, IGF-1, nGH, stop and go, experiment, humpback grouper

Judul: Kerusakan bantalan rel kereta api di wilaya inspeksi 2 jalan dan bangunan perusahaan jawatan kereta api (pjka),cirebon
Abstrak: Kereta api merupakan salah satu sarana angkutan yang murah, cepat dan aman serta dapat mengangkut barang dalam jumlah besar. Kelancaran operasi sarana angkutan tersebut banyak ditentukan oleh kondisi jalan rel, termasuk kondisi bantalannya. Dalam hal ini bantalan rel kereta api dapat dibuat dari kayu, logam, atau beton. Namun demikian kayu merupakan bahan yang paling banyak digunakan sebagai pembuat bantalan rel kereta api di berbagai negara. Kenyataan menunjukkan bahwa kayu yang digunakan sebagai bantalan rel kereta api sering mengalami berbagai macam kerusakan yang menyebabkan bantalan tidak berfungsi lagi atau menurun fungsinya. Di Indonesia, informasi mengenai jenis dan tingkat kerusakan bantalan kayu masih sangat kurang, pada- hal informasi tersebut sangat penting sebagai dasar pertimbangan dalam rangka pemeliharaan jalan kereta api, agar umur pakainya (service life) lebih lama.
Keyword: bantalan rel