Judul: Gambaran Mikroskopis dan Luas Permukaan Vili Usus Halus Ayam Broiler Setelah Pemberian Probiotik dan Bioinsektisida Bacillus thuringiensis dan Beauveria bassiana Peroral
Abstrak: Penelitian ini dilaksanakan untuk mengetahui pengaruh pemberian probiotik yang ditambah dengan bioinsektisida Bacillus thuringiensis dan Beauveria bassiana terhadap gambaran mikroskopis dan luas permukaan vili usus halus ayam broiler
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Judul: Evaluasi Pemberian Probiotik Bacillus coagulans strain D3372 terhadap Densitas, Tinggi, Luas Permukaan Vili dan Profil Darah Ayam Broiler
Abstrak: Probiotik merupakan pakan tambahan (feed additive) dalam bentuk mikroba hidup yang menguntungkan dalam saluran pencernaan. Penelitian ini bertujuan untuk menganalisis pengaruh pemberian probiotik Bacillus coagulans strain D3372 dengan tingkat konsentrasi yang berbeda terhadap densitas, tinggi, luas permukaan vili dan profil darah ayam broiler. Percobaan tersebut menggunakan 600 ekor DOC ayam broiler strain Lohman dan dipelihara sampai umur 35 hari. Ayam secara acak dibagi menjadi empat perlakuan (P0: tanpa probiotik, P1: probiotik 105 cfu g-1, P2: probiotik 106 cfu g-1, dan P3: probiotik 107 cfu g-1) dengan 5 kali ulangan, setiap ulangan terdiri atas 30 ekor ayam. Percobaan menggunakan rancangan acak lengkap dan dianalisis menggunakan analysis of variance (ANOVA), selanjutnya jika terdapat perbedaan yang nyata dilakukan uji lanjut Polinomial Ortogonal. Hasil penelitian menunjukan pemberian probiotik nyata (P<0.05) meningkatkan tinggi, dan luas permukaan vili, serta mempengaruhi persentase limfosit, heterofil, dan rasio H L-1 akan tetapi tidak mempengaruhi densitas vili, jumlah sel darah merah, jumlah sel darah putih, nilai hematokrit, nilai hemoglobin, presentase monosit, eosinofil, dan basofil. Kesimpulan dari penelitian ini adalah pemberian probiotik Bacillus coagulans strain D3372 meningkatkan tinggi dan luas permukaan vili usus serta menurunkan tingkat stres pada ayam. Konsentrasi probiotik yang optimal untuk menghasilkan kondisi vili yang baik yaitu 4.8 x 106 cfu g-1. Konsentrasi optimal untuk menghasilkan rasio H L-1 yang baik yaitu 4.6 x 106 cfu g-1.
Keyword: ayam broiler, probiotik Bacillus coagulans strain D3372, profil darah, rasio H L-1, vili

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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