Judul: Pengaruh Pemberian Probiotik Lactobacillus brevis dan Prebiotik Oligosakarida terhadap Respon Imun dan Resistensi Benih Patin Siam (Pangasionodon hypophthalmus) Yang Diinfeksi Aeromonas hydrophila
Abstrak: Thai catfish (Pangasianodon hypophthalmus) is one of the important economic and cultivated fish species in Indonesia. while diseases caused by Aeromonas hydrophila often breakout and spread in catfish farming and sometimes cause large economic losses. Aeromonas hydrophila is a causative agent of motile aeromonad septicemia (MAS). The wide and frequent use of antibiotics in aquaculture for this diseases, has resulted in the development and spread of antibiotic resistance. The other alternative for this case were probiotics, prebiotics, and combined of probiotics and prebiotics (synbiotics). Probiotics are live microbial supplements that beneficially affect the host animal by improving its microbial balance. These strains commonly used as probiotics were Lactobacillus. Prebiotics are non-digestible food ingredients that stimulate the growth with selective of intestinal microbial like bifidogenic and lactic acidbacteria in the gastro-intestinal tract. Typically, the prebiotics consist of oligosaccharides, like fructooligosaccharide (FOS), dan galactooligosaccharide (GOS).The aim of this study was to evaluate of probiotic Lactobacillus brevis, prebiotic Oligosaccharides and synbiotics upon the population bacteria in the intestine, immune response, survival (SR), and growth rate (SGR) of Thai Catfish seeds (Pangasionodon hypophthalmus) which was infected by Aeromonas hydrophila. The study was carried out at the Fish Health Laboratory, Aquaculture Department of the Faculty of Fisheries and Marine Science Bogor Agricultural University; College of Fisheries university Extension Programe; and Main Centre of Freshwater Aquaculture Development, on October – December 2012. The parameters were total number of Lactobacillus sp. in the gut, total number of erythrocyte, hemoglobin, hematocrit, leucocyte, differntial leucocyte, and phagocytic activity, survival rate, growth rate, FCR (feed convertion ratio), and water quality. For in vivo test 5 (five) treatments and three replicated utilized, i.e. positive control (K(+)), negative control (K(-)), probiotic (Pro), prebiotics Oligosaccharides (Pre) and sinbiotics (Sin). One-way ANOVA was used to determine differences among the treatments. When a significant (p<0.05) difference was detected, the means were compared by use of Duncan’s multiple range test, and analysed by Xl-stat programe The results of the characteristics test showed that the species of probiotic and pathogen were Lactobacillus brevis and Aeromonas hydrophila respectively. In vivo test was carried out in 5 (five) treatments, i.e. positive control (K(+)), negative control (K(-)), probiotic (Pro), prebiotic (Pre) and synbiotic (Sin). The results showed that the total number of Lactobacillus sp. in the gut were between vi 101-106 (CFU/gr) and the total number of erythrocyte, hemoglobin, hematocrit, leucocyte, differntial leucocyte, and phagocytic activity have shown significant different (p<0.05) with control at the some times. The treatments of Sin, Pre, Pro and K(-) were at 100% in survival rate (SR), while K(+) was (43.33 ± 11.55)%. The growth rate showed significant different (p<0.05), with the highest value was on Sin treatment (3,37 ± 0.14)%. The FCR of Pro, Pre, and Sin were 1,414±0,13; 1,431±0,08 and 1,305±0,08. This fact suggested that Sin was better than the other treatments in immune respon at total erythrocyte, hemoglobin, hematocrit, and total leucocyte.
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Judul: Sintasan, Pertumbuhan dan Respons Imun Benih Ikan Patin Pangasianodon hypophthalmus yang Diberi Prebiotik Mannanoligosakarida (MOS) dan Diinfeksi Aeromonas hydrophila.
Abstrak: Pemeliharaan benih patin Pangasianodon hypophthalmus secara intensif menimbulkan penyakit Motile Aeromonad Septicaemia (MAS) yang disebabkan oleh infeksi bakteri Aeromonas hydrophila. Salah satu alternatif untuk menanggulangi penyakit tersebut adalah dengan penggunaan prebiotik mannanoligosakarida (MOS). Penelitian ini bertujuan untuk menguji efektivitas penggunaan prebiotik MOS melalui pakan terhadap sintasan, kinerja pertumbuhan dan respons imun pada benih ikan patin yang diinfeksi A. hydrophila. Larva diberi pakan Artemia sp. dan pakan komersial yang telah diperkaya dengan prebiotik. Penelitian ini terdiri dari lima perlakuan yakni kontrol (tanpa prebiotik), pemberian prebiotik melalui Artemia sp. dan pakan buatan masing-masing sebanyak, (A) 6 mg/L dan 0.15%; (B) 9 mg/L dan 0.3%; (C) 12 mg/L dan 0.45%; (D) 12 mg/L dan 0.6%. Larva ikan patin yang digunakan memiliki bobot rata-rata 1.53 mg dan panjang rata-rata 0.44 cm, dipelihara dengan kepadatan awal 15 ekor/L (150 ekor per akuarium). Setelah 28 hari pemeliharaan ikan uji diinfeksi bakteri A. hydrophila dengan dosis 107 CFU m/L. Hasil penelitian ini menunjukkan bahwa perlakuan prebiotik mannanoligosakarida sebelum uji tantang menghasilkan sintasan, pertumbuhan dan rasio konversi pakan yang lebih baik dibandingkan kontrol (P<0.05). Setelah ikan di uji tantang, perlakuan prebiotik memiliki sintasan dan respons imun lebih tinggi dibandingkan kontrol (P<0.05) dengan hasil terbaik diperoleh pada pemberian prebiotik dengan konsentrasi 12 mg/L pada Artemia sp. dan 0.45% pada buatan.
Keyword: Aeromonas hydrophila, mannanoligosakarida (MOS), Pangasianodon hypophthalmus, prebiotik

Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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