Judul: Morfologi darah ikan mas (Cyprinus carpio), Nila merah (Oreochromis sp.), dan lele dumbo (Clarias gariepinus) dari Sukabumi
Abstrak: Penelitian ini bertujuan untuk mengetahui perbedaan-perbedaan morfologi darah pada ikan mas (Cyprinus carpio), nila merah (Oreochromis sp.) dan lele dumbo (Clarias gariepinus) dari Sukabumi. Penelitian dilakukan di Laboratorium Parasit Fakultas Perikanan IPB di Dramaga dan Balai Budidaya Air Tawar (BBAT) Sukabumi dari tanggal 30 Agustus 1989 sampai dengan 30 Januari 1990. Penelitian ini meliputi pengambilan contoh ikan dari Sukabumi dan pembuatan preparat ulas darah serta pemeriksaan dibawah mikroskop di Laboratorium Parasit. Pengambilan contoh ikan dilakukan tiap bulan sekali sebanyak 30-100 ekor dan 30 ekor untuk pembuatan preparat ulas darah. Pemeriksaan dilakukan terhadap ukuran dan bentuk sel darah, letak inti, afinitas sel terhadap zat warna serta identifikasi parasit. Dari hasil penelitian diketahui jenis sel darah yang terdapat pada ketiga ikan tersebut yaitu proeritrosit, eritrosit, trombosit, limfosit, monosit, neutrofil, dan blast cell. Pengelompokan sel-sel tersebut berdasarkan persamaan morfologi dengan sel darah mamalia. Sel-sel tersebut mempunyai ukuran yang berbeda-beda antara ketiga ikan tersebut, sedangkan untuk bentuk dan kemampuan setiap sel dalam menyerap zat warna antara ketiga ikan tersebut sebagian besar tidak menunjukkan adanya perbedaan kecuali pada sel eritrosit. ...
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Judul: Kerentanan Benih Ikan Mas (Cyprinus carpio),Lele (Clarias batrachus),Gurame (Osphronemus gouramy), Dan Nila Merah (Oreochromis niloticus) Terhadap Infeksi Parasit Myxosporea
Abstrak: Penelitian ini bertujuan untuk mengetahui kerentanan benih ikan mas, lele, gurame dan nila merah terhadap infeksi parasit Myxosporea. Penelitian dilakukan di Laboratorium Fakultas Perikanan IPB di Darmaga dan Balai Budidaya Air Tawar (BBAT) Sukabumi dari tanggal 18 Desember 1988 sampai dengan 15 Juni 1989. Penelitian meliputi 4 tahap kegiatan yaitu: 1. Penyediaan dan pemeliharaan benih dilakukan dari tanggal 18 Desember 1988 sampai 12 Maret 1989 di Lab. Faperikan IPB Darmaga. 2. Penularan ikan uji dilakukan dari tanggal 13 Maret 1989 sampai 28 Maret 1989 di BBAT Sukabumi. 3. Pemeliharaan ikan uji dilakukan di lab. Faperikan IPB Darmaga dari tanggal 28 Maret 1989 sampai 14 Mei 1989. 4. Pemeriksaan ikan uji dan identifikasi parasit Myxosporea dilakukan di Lab. Faperikan IPB dari tanggal 15 Mei 1989 sampai tanggal 15 Juni 1989. ...
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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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