Judul: Efektivitas Spawnprim pada proses ovulasi dan pemijahan ikan komet Carassius auratus auratus
Abstrak: Artificial propagation is required in particular for fish that difficult to spawn naturally in the captivity. Spawning by hormonal manipulation is one of the techniques that is often done in the hatchery fish. The most common hormone used this technique is Ovaprim (20 μg/mℓ sGnRH-a + 10 mg/mℓ anti-dopamine, AD). Recently, it was also found other materials that can stimulate spawning namely aromatase inhibitor (AI). The addition of AI in hormonal compound is expected to stimulate spawning fish more effectively and efficiently. This study aimed to test the effectiveness of Spawnprim (LHRH-a + anti-dopamine + AI) in stimulating spawning in female comet-fish as a model fish. Spawnprim was designed into four different treatment combinations (A, B, C, and D) using 0- 15μg/mℓ LHRH-a. Ovaprim was used as a positive control whereas physiological solution without any hormone was used as a negative control. Six female of comet fish were injected with each hormonal treatment with a dose of 0.5mℓ/kg body weigth. The results showed that Spawnprim A, B, C and D could stimulate ovulation with the same success rate as the Ovaprim which was 100% in the latent period of 6 hours post-injection, whereas control negative showed no ovulation. Spawnprim C and D did not show a significant difference in ovulation rate with Ovaprim (p>0,05). Spawnprim A, B, C and D give the same results with Ovaprim for egg diameter, fertilization level, hatching level, and survival rate of larvae at the age of 4 days (p>0,05). AI may replace the role of LHRH in stimulating final maturation process of gonads. Spawnprim C and D can be as effective as Ovaprim in the final maturation of the gonads, and yet more economical.
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Judul: Penggunaan “spwanprim” untuk merangsang Ovulasi pada ikan patin (pangasionodon Hypothalmus)
Abstrak: Aquaculture is an activity culture for fish that have a good prospect. In all many kind of fishes that be cultured, Pangasionodon hypothalamus is a one of the fish which have good prospect in hatchery industry. However, the breeding of catfish (Pangasionodon hypothalmus) can only be done by artificial spawning with hormonal stimulation. Aromatase inhibitor (AI) have been known to accelarate the process of gonadal maturation in fish. The combination of aromatase inhibitor (AI), antidopamine (AD) and LHRHa has been used to accelerate the final maturation and also as a substitute LHRHa. In this study, various doses of LHRHa 0, 5,10, 15 μg/ml combined with AI and AD, which later named Spawnprim A, B, C, and D, then injected the fish with a dose of 0,7 ml/kg fish. Ovaprim has been used as a positive control and physilogical solution as a negative control. Fish injected with HCG at a dose of 0,3 ml/kg fish 24 hours before injection with spawnprim or ovaprim. Ovulation has been observed by artificially spawning by stripping. The result showed that fish injected with spawnprim been able to ovulate with good quality eggs at 14 hours after the time of injection or 2 hours late compared with ovaprim. Spawnprim can be used as an alternative in the artificial spawning with hormonal stimulating with hormonal stimulation with a more economical price.
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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