Judul: Pemberian berbagai jenis madu dengan rasio pengenceran berbeda setelah masa penyimpanan terhadap kualitas sperma ikan patin siam (Pangasius hypopthalmus).
Abstrak: Good seed can be produced by a good broodstock, to produce a good broodstock would takes a long time and high cost. A problem that usually occurs in catfish hatchery industry was time ovulation of catish eggs for 9-15 hours after injection. So it takes time for the sperm waiting for 6 hours for the whole egg can be fertilized well. The purpose of this study was to determine the effect of various types of honey (longan honey, lychee honey, and cottonwoods honey) on sperm quality Siamese catfish (Pangasius hypopthalmus) with different dilution ratios after the storage period which includes scores motility, percentage motility, viability and morphology of sperm, fertilization rate, and hatching rate. The best treatment was obtained on the aplication of longan honey as a sperm diluent 1:50 dilution ratio. Size of sperm head reached 4,29±0,51μm and a long tail 27,22±1,54μm. Sperm motility scores obtained 5,00±0,00aA, sperm motility 87,67±0,58aC%, sperm viability 96,33±0,58aB%, the fertilization rate 97,10±0,70cC% and hatching rate 93,44±2,39cC%. In addition, the ratio of fresh sperm fertilization 1mL and the number of eggs reaches 1:125000.
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Judul: Evaluation of the Effectivity of Patin Brain Extract to Induce Spawning of Sangkuriang Catfish, Clarias sp.
Abstrak: The availability of fish juvenile with high quality and quantity is a key factor in aquaculture. Important development in fish breeding has been developed. Patin, Pangasianodon hypopthalmus brain extract has been known to contain GnRH that could stimulate the pituitary gland to secrete gonadotropin hormone. The aim of this research is to evaluate the effectivity of Patin brain extract to induce Sangkuriang catfish, Clarias sp. Spawning. This research showed that the dose of Patin brain extract with 200 mg/kg of brood catfish was the lowest dose to give the best result of Sangkuriang catfish, Clarias sp. spawning with the degree of spawning of 66,66%, spawning latency time of 9,25 ± 1,06 hour, egg diameter of 1,51± 0,09 mm, spawning fecundity of 11,38 ± 0,87%, fertility rate of 90,63 ± 9,50 and hatching rate of 76,3 ± 6,14%. The degree of spawning had the highest value (P<0,05) which was 100% when female brood catfish was injected with synthetic hormon (ovaprim as much as 0,3 ml/kg) and the hypofisis extract of Pangasius compared to other treatments.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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