Judul: Pemberian kappa-karaginan untuk meningkatkan respon imun non-spesifik dan resistensi penyakit pada ikan lele dumbo Clarias sp.
Abstrak: Penyakit Motile Septicaemia (MAS) yang disebabkan oleh bakteri Aeromonas hydrophila, merupakan masalah utama dalam pembudidayaan ikan air tawar, termasuk ikan lele dumbo Clarias sp. Penelitian ini dilakukan untuk meningkatkan respon imun non-spesifik ikan lele terhadap infeksi bakteri A. hydrophila, menggunakan imunostimulan kappa-karaginan (k-carragenan) yang diekstrak dari rumput laut E. cottonii.
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Judul: Pemberian Kappa-Karagenan secara Oral pada Ikan Lele Dumbo Clarias sp. untuk Meningkatkan Respons Imun Non-Spesifik dan Resistensi terhadap Aeromonas hydrophila
Abstrak: A study to evaluate the role of k-carageenan in varying dose to prevent A. hydrophilla infection was conducted. Experiment comprised by two stages. The first stage which to obtain the best dose, had performed by suplementation the k-carageenan at rate 5 g/kg, 10 g/kg, 20 g/kg of fish feed, and control. After four weeks rearing all fish except in negative group was chalenged by A. hydrophilla with consentration 108 cfu/fish that performed by means intramusculary injection. The best dose then determined according to survival and hematology assay of fish. The second stages studied about efficacy of duration administration at daily, seven days, 14 days, and 21 days of the best outcoming dose, where the efficacy determined through the growth rate and survival rate of fish during14 days post-infection. The results showed that fish in group 10g kg-1 had better performance compared to other chalenged group. The value of suvival rate, total haemoglobin, hematocrite, eritrocyte count, leucocyte count, and phagocytic activity were 95,83%; 10,40±1,25 g%; 33,47±1,47%; 2,19±0,06 (106 cell/mm3); 14,47 ± 0,96 (105 sel/mm3); and 16,35 ±1,10% respectively. Moreover, even not support survival rate of fish at best (only 71%, lower than 80% at 21 days treatment), application at 14 days had considered as the best duration administration due to it’s support to the growth rate of fish at best (28g) when compared to others. Then, it was conclude that administration at rate 10 g/kg in combination with 14 days application, had better effect to elevate the immune system of catfish.
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Judul: Struktur Kristal Film BaxSr1-xTiO3 dengan Variasi Fraksi Mol (x = 0,5 ; 0,6 ; 0,7 ; 0,8)
Abstrak: BaxSr1-xTiO (BST) film has been successfully made by growing BST on substrate surface Si (100) p-type with chemical solution deposition methode and spin coating technique at 3000 rpmrotational speed for 30 seconds. BST film made with mole fraction variation (x = 0,5 ; 0,6 ; 0,7 ; 0,8) and annealing process at a temperature of 850 °C for 22 hours. Characterization of BST samples obtained using X-ray diffractometer. The results of X-ray diffractometer characterization showed that the best crystal structure resulting in x = 0,5 mole fraction with the highest diffraction intensity and 25,55 nm crystal size, while the lowest diffraction intensity is owned by BST films with x = 0,8 mole fraction and the crystal size of 41,86 nm.
Keyword: Bogor Agricultural University (IPB), XRD., chemical solution depositon, BST, Annealing