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: Rekayasa rematurasi ikan patin siam Pangasianodon hypophthalmus dengan penyuntikan hormon PMSG dan HCG serta penambahan vitamin mix 300 mg/kg pada pakan
Abstrak: The research was carried out from April to June, 2010 at Babakan Field LaboratoryPonds, Darmaga. The research aimed to increase the rematuration process rate on striped catfish Pangasianodon hypophthalmusthrough a combination of Pregnant Mare Serum Gonadotropin(PMSG)and Human Chorionic Gonadotropin (HCG) hormone injection with 5 and 2,5 IU; 10 and 5 IU;also 20 and 10 IU/kgof spawner body weight dosage combinedwith vitamin mixaddition to fish feed. Sixteen femalestriped catfish spawner were used, consisting of twelve PMSG-treatedspawner and 4 control spawner.This researchused one way single ANOVA with 4treatments and 3 replications. Statistic analysis of observed variables showed unsignificant differences among the three treatments in rematuration parameters. It was resulted that rematuration rate was increased in treatedspawners indicated by a 100% pregnancy. Spawners treated with 10 IU PMSG and 5 IU HCG/kg of spawner body weight along with 20 IU PMSG and 10 IU HCG/kg of spawner body weight dosage was able to reach maturity and spawned with the larval survival rate on the fourth day at 98,63% and 84,81% respectively, thus making 10 IU PMSG and 5 IU HCG/kg of spawner body weight as the best dosage.
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik.
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik