Judul: Gambaran diferensiasi leukosit pada ayam yang terinfeksi Eimeria spp. secara alami dan telah diberi ekstrak daun johar (Cassia siamea Lamk.)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh pemberian ekstrak daun johar dengan berbagai konsentrasi (dosis 4.09 mg/0.5 ml, dosis 8.18 mg/0.5 ml, dan dosis 16.38 mg/0.5 ml) terhadap jumlah dan jenis leukosit ayam yang terinfeksi Eimeria spp. Penelitian ini menggunakan ayam petelur jantan berumur 2 bulan dan dibagi dalam 6 kelompok yaitu kelompok kontrol negatif (K-), kelompok kontrol positif (K+), kelompok obat (KO), kelompok johar dosis 1 (J1), kelompok johar dosis 2 (J2), dan kelompok johar dosis 3 (J3). Darah diambil dari vena axillaris dan dibuat preparat ulas. Berdasarkan hasil pengamatan dapat disimpulkan bahwa ekstrak daun johar dengan dosis 4.09 mg/0.5 ml dapat mengembalikan persentase jumlah heterofil dan monosit ke nilai normal. Sedangkan jumlah total leukosit dan persentase ratarata limfosit, eosinofil, dan basofil tidak mengalami perubahan.
Keyword: Leucocyte, Eimeria spp, The layer cock, Bogor Agricultural University

Judul: Gambaran eritrosit ayam terinfeksi Eimeria spp. secara alami yang diberi ekstrak daun johar (Cassia siamea Lamk.)
Abstrak: Koksidiosis merupakan satu penyakit yang menyerang ayam terutama pada umur 4-16 minggu yang dapat menimbulkan kerugian ekonomi. Penelitian ini dilakukan untuk mengetahui pengaruh pemberian ekstrak daun johar (Cassia siamea Lamk.) pada ayam terinfeksi alami Eimeria spp. yang mengandung 8,1 x 103-23,6 x 103 ookista terhadap gambaran darah merah yang meliputi jumlah eritrosit, kadar hemoglobin dan nilai hematokrit. Sebanyak 90 ekor ayam dibagi menjadi 6 kelompok yaitu kelompok kontrol negatif K(−), kontrol positif K(+), kontrol obat (KO), johar dosis 4,09 mg/0,5 cc (J1), johar dosis 8,18 mg/0,5 cc (J2) dan johar 16,36 mg/0,5 cc (J3). Pengambilan darah dilakukan sebanyak 8 kali dari semua kelompok ayam untuk memperoleh gambaran jumlah eritrosit, kadar hemoglobin dan nilai hematokrit. Hasil penelitian menunjukkan bahwa jumlah eritrosit ayam terinfeksi 8,1 x 103-23,6 x 103 ookista tidak terpengaruh. Kadar hemoglobin dan nilai hematokrit menunjukkan adanya penurunan pada semua kelompok terinfeksi bila dibandingkan dengan K(−). Kesimpulan dari penelitian ini adalah johar dengan dosis 16,36 mg/0,5 cc (J3) dapat mempertahankan jumlah eritrosit, kadar hemoglobin dan nilai hematokrit pada ayam yang terinfeksi. Jumlah eritrosit, kadar hemoglobin dan nilai hematokrit pada kelompok J3 cenderung lebih tinggi daripada kelompok J1 dan J2.
Keyword: Eimeria spp, Eritrosit, Daun johar, Ayam, Bogor Agricultural University

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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