Judul: Induksi Maturasi Ikan Sidat (Anguilla bicolor) dengan Menggunakan Kombinasi Hormon Berbeda
Abstrak: Production of Indonesian eel (Anguilla bicolor) juvenile through the hatchery can not be done yet. In this research, induction of Indonesian eel gonadm aturation was performed by hormonal with a combination of pregnant mare serum gonadotropin (PMSG), human chorionic gonadotropin (HCG) antidopamin and recombinant growth hormone (rGH). This research consisted of five treatments namely: control(NaCl 0,9%), PMSG 20 IU/kg, PMSG 20 IU/kg + antidopamin 10 ppm/kg, PMSG 20 IU/kg + antidopamin 10 ppm/kg + rGH 10 μg/kg dan PMSG 20 IU/kg + HCG 10 IU/kg. Each treatment contained 10 fishes. Hormonal induction was conducted by intramuscular injections, as much as five times at intervals of seven days. Furthermore observations on gonadal development were performed after injection for 21 days.The results showed that the treatment generated pregnancy level of 100%, while control was 0%. The best treatment is PMSG 20 IU/kg + antidopamin 10 ppm/kg+ rGH 10 μg/kg, seen from a more mature phase of the gametes, spermatocytes in male and oocytes with perinukleolar phase in female fish. Eel fish at body weight 120.4 to 207.8 g and 40.9 to 43.1 cm of body lenght was male, body weight of 274.8 g and length 47 cm was the intersexual phase eels, while at body weight 323.4 g and length 53 cm was female.
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Judul: Induksi Maturasi Ikan Sidat (Anguilla bicolor) dengan Menggunakan Premiks Hormon
Abstrak: Eel culture was still relying on elver from nature, but the silver and yellow eel have difficulties to mature gonad in culture condition. Hormone manipulation is one of method to manipulate gonadal maturation so that this study used combination of hormones and chemicals. Hormones were used is human chorionic gonadotropin (hCG), recombinant growth hormone (rGH), pregnant mare serum gonadotropin (PMSG), and chemicals such as antidopamin. The combination were induced intramuscular every 7 days for 5 weeks and there are 8 fish per treatment Treatment in this study is PA. Control; PB. hCG 20 IU/kg eel + antidopamine 10 mg/kg; PC. hCG 20 IU/kg eel + antidopamine 10 mg/kg + rGH 10 mg/kg eel; PD. hCG 20 IU/kg eel; PE. hCG 20 IU/kg eel + PMSG 20 IU/kg eel. PC gave effect in spermatocyte formation on 6th and 8th based on histology. Eel pregnancy reached 87.5% per treatment, but control did not pregnancy. Gonad development in PC has reached testicular tubule formation stage, pre-spermatogenic phase, and early spermatogenic. Sexual status of Anguilla bicolor (117-199 g ; 37-45 cm) was male.
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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