Judul: Perhitungan Modus Vibrasi Molekul H2O
Abstrak: Pemodelan gugus fungsi molekul H2O dapat digunakan untuk mendapatkan parameter vibrasi dan bilangan gelombang serapan vibrasi molekul H2O. Perhitungan ini merupakan perhitungan teoritik gugus O – H pada molekul H2O dengan menggunakan model osilator harmonik. Parameter vibrasi dari model ini dioptimasi dengan menggunakan metode Particle Swarm Optimization (PSO). Hasil dari optimasi PSO didapatkan parameter vibrasi yaitu panjang ikatan (r0) sebesar 9.7561 × 1011 m, sudut ikatan (θ) sebesar 105.11°, konstanta pegas O–H (kOH) sebesar 775.92 N·m1, konstanta pegas H–H (kHH) sebesar 70.291 N·m1 dan frekuensi vibrasional harmonik (ω) masing-masing 3.0076 × 1014 rad·s1 untuk vibrasi tekuk, 7.0798 × 1014 rad·s1 untuk vibrasi regang antisimetris dan 6.9746 × 1014 rad·s1 untuk vibrasi regang simetris. Tiga frekuensi hasil optimasi PSO bersesuaian dengan bilangan gelombang 1595.6 cm–1, 3755.9 cm–1, dan 3700.2 cm–1. Ketepatan bilangan gelombang serapan pada penelitian ini adalah 98.783%.
Keyword: gugus fungsi, konstanta pegas, vibrasi

Judul: Perhitungan Energi Disosiasi Ca-O dan C-O pada Gugus Fungsi Hidroksiapatit Menggunakan PemodelanSpektroskopi Inframerah
Abstrak: Modeling the functional groups of hydroxyapatite can be used to obtain absorption wave numbers and the spring constant. Analysis of energy release is done by calculating the functional group dissociation energy. This study is a theoretical calculation of the hydroxyl group (OH-), phosphate (PO43-), and carbonate (CO32-) using spring models. Modeling OH- group obtained wavenumber absorption 3417.4316 cm-1, 3430.6485 cm-1, and 3437.4887 cm-1. Modelling group PO43- absorption wave numbers obtained 1059.3734 cm-1, 1085.2559 cm-1, and 1070.2309 cm-1. CO32- modeling group obtained wavenumber absorption 1187.5995 cm-1, 1167.7597 cm-1, and 1120.2595 cm-1. Bond dissociation energy of CO on the hydroxyl group is 572.3579 kJ/mol. Bond dissociation energy of Ca-O in the carbonate group is 586.9238 kJ/mol, whereas the carbonate group is 677.4847 kJ/mol. Theoretical absorption wave numbers OH- and PO43- consistent with the hypothesis while CO32- group is smaller than the hypothesized value.
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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