Judul: Antibody Responses against Newcastle Disease and Evaluation of Infectious Bronchitis Maternal Derived Antibody on Vaccinated Layers.
Abstrak: Information of maternal derived antibody (MDA) and onset of immunity after vaccination is important to determine appropriate vaccination programme of chickens. The aim of this study was to evaluate duration of Infectious Bronchitis (IB) MDA and evaluate onset of immunity Newcastle Disease (ND) vaccination among layers. All layers were vaccinated using live ND and Infectious Bursal Disease (IBD) at one day old age, and received Avian Rhinotracheitis (AR) vaccine at 4 day old age. Serum samples were collected at various ages: 7, 10, 14, 20, 22, 24, 29 and 35 day old. The presence of ND antibodies was measured by the hemagglutination inhibition (HI) test, whilst the presence of IB antibodies was measured by enzyme-linked immunosorbent assay (ELISA). Our study showed that ND antibodies were at positive level until 24 day old age, and reached protective level ≥ 25 only at 7 day old age, whilst IB MDA were positive up to 17 day old age. This result indicating the needs of ND booster vaccination at least at 24 day old and IB vaccination at 17 day old age.
Keyword: antibody, Infectious Bronchitis, layers, Newcastle Disease, vaccination

Judul: Studi kemampuan vaksin aktif ND-IB: pembentuk kekebalan dan perlindungan terhadap paparan virus ib pada ayam pedaging
Abstrak: Objective of the study is to measure the antibody titer, clinical sign, and post mortal lesion of broilers vaccinated with Newcastle Disease-Infectious Bronchitis (ND-IB) live vaccine (LaSota H-120) and challenge with Infectious Bronchitis virus (IBV) field isolates. As much as 100 DOCs were use in this study. The maternal antibody derivates were taken from 20 broilers on the 1st day of experiment. The rest of the broilers divided into 4 groups (K1, K2, K3, and K4). Each group consisted 20 broilers. Group K1 and K2 were unvaccinated. Group K3 and K4 were vaccinated on the 2nd day according to the manufacturer procedure. Blood samples from unvaccinated and vaccinated group were taken on 7th, 14th, and 22nd day. Antibody titer was measured by using enzyme linked immunosorbent assay (ELISA). Challenge was carried out on 14th day (12th day post vaccination) to group K2 and K4. The result showed that chickens have high maternal antibody titer. The combination of intranasal and oral vaccination was not able to produced protective antibody against IB. Vaccination was able to reduced lethargy sign and cloudy airsacs. The clinical signs and post mortal lesions were more severe on K2 group than K4 group.
Keyword: broiler, ELISA, Infectious Bronchitis, LaSota H-120, vaccine

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology