Judul: Pemindahan Embrio Pada Sapi Dengan Metode Pembedahan Kasus Pertama Di Indonesia
Abstrak: Pemindahan embrio dengan metode pembedahan merupakan salah satu teknologi maju dalam usaha pengembangan popula s ternak, khususnya sapi, dengan tujuan mendapatkan keturunan yang bermutu genetik tinggi. Penerapan teknologi ini untuk pertama kali di Indonesia diprakarsai oleh mentri Koperasi dan dilaksanakan oleh peternakan sapi PT Ber dikari United Livestock di Cicurug, Jawa Barat, di bawah suatu tim yang dibentuk oleh Badan Penelitian dan Pengembangan Koperasi. Pemasukan embrio dilakukan oleh tenaga ahli dari perusahaan Granada International Corporation, Texas, Amerika Serikat. Tahapan pelaksanaan pemindahan embrio meliputi seleksi, fertilisasi dan panen embrio pada sapi donor, kemudian seleksi, sinkronisasi serta pemindahan embrio pada sapi resipien. Embrio yang dipakai adalah dari bangsa sapi FH dan Brahman yang telah ditampung dan dibekukan di Texas, Amerika Serikat, dan dibawa ke Indonesia dalam bentuk beku di dalam bejana berisi N₂ cair. ...
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Judul: Embrio trasfer pada sapi dan hambatan-hambatannya
Abstrak: Embrio transfer merupakan suatu tehnologi baru dalam pengembangan produksi peternakan, khususnya sapi, yang bertujuan untuk meningkatkan populasi dan mutu genetik ternak dalam waktu yang relatif singkat dari suatu betina maupun jantan unggul.. Pelaksanaan pemindahan embrio meliputi : Seleksi donor, seleksi resipien, superovulasi, inseminasi donor, pengumpulan embrio, penyimpanan embrio, sinkronisasi birahi, pemindahan embrio (dengan pembedahan atau tanpa pembedahan). Respon donor yang mempunyai variasi cukup tinggi terhadap pemberian hormon (PMSG/FSH), untuk merangsang terjadinya superovulasi; merupakan salah satu hambatan yang ditemukan, sehingga hasil yang didapatkan tidak sesuai yang diinginkan. Hambatan lain berupa viabilitas embrio yang masih rendah, dimana dari 614 sel telur/embrio yang dikumpulkan hanya 43.3 % yang mempunyai morfologi normal dan dapat dipindahkan ke sapi resipien. Pemindahan embrio tanpa pembedahan sekalipun tehnologi nya sedikit banyak telah dikuasai, namun kegagalannya masih cukup besar dan dapat dianggap hambatan.
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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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