Judul: Kappa-Karagenan Sebagai Imunostimulan untuk Pengendalian Penyakit Infectious Myonecrosis (IMN) pada Udang Vaname, Litopenaeus vanname
Abstrak: The modulation on nonspesific immune response, growth and disease resistance of Litopenaeus vannamei against IMNV was aimed on this studied. Briefly, the experiment had comprised two stages. The first stage studied dose of k-carrageenan administration at rate 5, 10, and 15 g kg-1 feed for 4 weeks rearing, while the later studied about frequency of administration of the best outcoming dose including daily, 7 days interval, and 14 days interval administration for 5 weeks rearing. Both of stages had positive and negative control, and done in complete randomized design where the performance based on dynamic of immunity and shrimp growth were measured during rearing, while survival rate, clinical signs and histophatology were observed after challenged. Shrimp were fed three times a day at feeding rate of 4-5% of body weight day-1. Challenge test was performed by mean feeding the shrimp with IMNV via oral route at rate 10% of body weight during 3 consecutive days, than observed for 14 days. The results showed that shrimp which administered with k-carrageenan at rate of 15 g kg-1 feed had best performance than other aplications. The shrimp’s hemocyte count, phagocytic activity, phenoloxidase activity, and relative growth were 12±0,72 x 106 cell ml-1; 34,67±0,58%; 0,511±0,10 and 86.15% respectively. After challenged, the survival rate was 85±7.07%. Moreover, in the next stage work, aplication in 14 days interval gave 88.57% in relative growth and 93±5,8% in survival rate, higher than other aplications. They were confirmed by visual gross sign and histopathology that appeared as well as PCR test. Then, it was concluded that, the administration of k-carrageenan at rate 15 g kg-1 and present in 14 days interval had better immunostimulatory effect to enhance nonspesific immune response and elevate disease resistance of whiteleg shrimp juveniles against IMNV.
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Judul: Aplikasi Probiotik dengan Dosis Berbeda untuk Pencegahan Infeksi IMNV (Infectious Myonecrosis Virus) pada Udang Vaname Litopenaeus vannamei
Abstrak: Aplikasi probiotik pada budidaya udang vaname telah terbukti mampu meningkatkan sintasan dan respon imun terhadap infeksi patogen. Penelitian ini bertujuan untuk mengevaluasi kinerja bakteri probiotik Bacillus NP5 terhadap sintasan dan respon imun udang vaname setelah diinfeksi IMNV (Infectious Myonecrosis Virus). Sebanyak 10 ekor udang vaname dengan bobot rata-rata 2,41±0,07 g.ekor-1 dipelihara masing-masing di dalam akuarium dengan volume air laut 20 L selama 30 hari. Pemberian probiotik pada pakan sebanyak 1 mL per 100 g pakan (1% v/w). Perlakuan yang diberikan yaitu kontrol negatif dan kontrol positif (KN dan KP; tanpa pemberian probiotik), A (probiotik 104 CFU.mL-1), B (106 CFU.mL-1), dan C (108 CFU.mL-1). Semua perlakuan diulang sebanyak 3 kali. Hari ke-31, perlakuan KP, A, B, dan C diinjeksi dengan IMNV sedangkan KN diinjeksi dengan larutan fisiologis kemudian dipelihara sampai 14 hari pasca injeksi. Udang vaname pada perlakuan C menunjukkan hasil terbaik dengan nilai sintasan 76,67%, laju pertumbuhan harian 5,39% hari-1, rasio konversi pakan 1,56 dan respon imun yang berbeda nyata dengan kontrol.
Keyword: Probiotik, Bacillus NP5, udang vaname, dosis, respon imun

Judul: Kriteria Osilasi Untuk Pertidaksamaan Diferensial Taklinear Orde Dua
Abstrak: dimana pertidaksamaan dibatasi pada suatu selang [T,oo) dengan T?:O, aCt) kontinu pada selang [0,00) dan j(u) mempunyai turunan pertarna yang kontinu pada selang (-00,00) dengan uj(u) >0 untuk u;"O. Dengan menggunakan Asumsi A dan Asurnsi B, diperoleh beberapa teorerna ten tang kriteria osilasi untuk pertidaksamaan diferensial taklinear orde dua.
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