Judul: IPB (Bogor Agricultural University)
Abstrak: Penelitian ini bertujuan untuk mencari informasi peran bursa Fabricius dalam produksi antibodi terhadap antigen vaksin NDV pada ayam kampung dan White Leghorn sebagai pembanding, dengan cara meneliti pertumbuhan bursa Fabricius, respons imun hmmral dah pengaruh bursektani pada respons imun humoral terhadap suntikan antigen pada stadia pertmhuhan bursa, serta meneliti aspek serologis dan hematologis sebagai respons terhadap suntikan antigen pada anak ayam yang dibursektomi pada umur 3 hari dan masa embrio.
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Judul: IPB (Bogor Agricultural University)
Abstrak: Semenjak ditemukan di Indonesia pada tahun 1988, penyakit Gumboro atau Infectious Bursa/ Disease (IBD) masih menjadi problem bagi petemak, sebab dapat menimbulkan kerugian ekonomi antara lain angka kesakitan yang tinggi, penurunan produksi, biaya pengelolaan yang tinggi serta bersifat imunosupresif. Pencegahan dengan jalan vaksinasi merupakan salah satu pemecahan masalah yang dapat dilakukan hingga saat ini. Penelitian ini dilakukan dengan melaksanakan program vaksinasi menggunakan intermediate strain (Winterfield 2512) terhadap ayam Specific Pathogen Free (SPF). Kelompok pertama diberikan vaksin intermediate strain sedangkan kelompok kedua adalah kelompok tanpa perlakukan atau kontrol. Aplikasi vaksin intermediate strain memberikan pengaruh yang tidak permanen terhadap organ pertahanan primer. Analisis dari indeks bursa secara keseluruhan berada di atas 0, 7, sedangkan bursa score lesion / skor lesio pada bursa secara keseluruhan menunjukkan nilai ≥ 2, sementara kelompok kontrol tidak mengalami perubahan. Selama tujuh minggu pasca vaksinasi semua ayam menunjukkan titer antibodi ≥800 x (nilai standar minimum) dengan uji serum neutralization (SN), sedangkan kelompok kontrol mempunyai nilai : S ≤8,0. Titer antibodi mengalami kenaikan secara signifikan sampai minggu ketiga dan keempat, kemudian menurun pada minggu ketujuh. Hasil uji SN≥ 800 x sebagai standar minimum atau diantara 15 - 75 Enzyme Linked Immunosorbent Assay unit (ELISA unit) sebagai nilai positif dengan uji ELISA. Pelaksanaan vaksinasi IBD yang telah dilakukan terhadap ayam SPF menggunakan intermediate strain menunjukkan tingkat keamanan dan bersifat protektif, walau secara klinis terjadi gangguan pertumbuhan.
Keyword: Gumboro, Infectious Bursa/ Disease (IBD), intermediate strain, ELISA, Vaksinasi IBD

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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