Judul: Studi morfologi abomasum domba lokal umur dewasa muda (6-12 bulan) dan uji aktivitas ekstrak mukosanya dalam mengkoagulasikan susu
Abstrak: Penelitian ini bertujuan mengetahui kemampuan aktivitas ekstrak mukosa daerah kelenjar fudus dan filorus pada abomasum domba lokal umur dewasa muda (6-12 bulan) dalam mengkoagulasikan susu serta mempelajari distribusi dan frekuensi sel-sel penghasil enzim protease pengkoagulasi susu secara imunohistokimia menggunakan metode avidin-biotin-peroxidase complex (Asu et al 1981). Pada abomasum domba lokal umur dewasa muda yang dianggap sebagai limbah, ternyata ekstrak mukosanya memiliki kemampuan mengkoagulasikan susu, baik ekstrak dari daerah kelenjar fundus maupun filorus.
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Judul: Pengaruh Penyimpanan Beku terhadap Kualitas Rennet yang Diekstrak dari Abomasum Domba Lokal
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh penyimpanan beku terhadap kualitas protein rennet hasil ekstraksi mukosa fundus abomasum domba lokal umur dewasa muda (5-12 bulan). Sampel yang digunakan adalah delapan ekstrak abomasum domba lokal yang dibagi kedalam dua kelompok yaitu kelompok yang tidak disimpan (N = 4) dan kelompok yang disimpan selama sepuluh bulan (N = 4). Ekstraksi dilakukan menggunakan modifikasi dari metode Qadri et al. (1962). Analisa kualitas rennet dilakukan berdasarkan uji koagulasi susu (Scott 1981) dan sodium dodecyl sulphate polyacrilamide gel electrophoresis (SDS-PAGE). Parameter yang diamati adalah bentuk koagulan dan waktu yang dibutuhkan untuk mengkoagulasi susu, serta gambaran pita protein. Hasil uji koagulasi susu menunjukkan bahwa kedua perlakuan mampu mengkoagulasi susu dengan bentuk koagulan (curd) yang padat dan waktu koagulasi dari kedua perlakuan tersebut tidak berbeda nyata (P > 0,05). Hasil SDS-PAGE menunjukkan bahwa pada rennet yang disimpan selama sepuluh bulan terlihat pita-pita yang lebih tebal dan gelap dibandingkan dengan rennet yang tidak disimpan. Kata kunci: rennet, penyimpanan beku, koagulasi susu, SDS-PAGE.
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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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