Judul: Pengaruh pemberian resin lebah terhadap gambaran darah maskoki Carassius auratus yang terinfeksi bakteri Aeromonas hydrophila
Abstrak: Resin lebah merupakan salah satu bahan organik yang dapat digunakan untuk merangsang sistem kekebalan tubuh dan memperbesar resisten terhadap infeksi penyakit dalam tubuh sehingga dapat dimanfaatkan sebagai imunostimulan. Selain itu resin lebah juga dapat merangsang pembentukan sel dan jaringan yang mendukung dalam menyembuhkan luka dengan cepat dan mengurangi hekas luka. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh resin lebah terhadap gambaran darah maskoki Carassius auratus yang terinfeksi bakteri Aeromonas hydrophila. Penelitian dilaksanakan pada bulan Juli hingga September 2005 di Laboratorium Kesehatan Ikan, Departemen Budidaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor. Tahapan penelitian ini meliputi persiapan wadah, persiapan ikan uji, pembuatan suspensi bakteri, penentuan LD-50, Penyuntikan ikan, pengambilan darah dan pengamatan gambaran darah ikan yang meliputi, penghitungan kadar hemoglobin dan hematokrit, penghitungan jumlah eritrosit dan leukosit serta diferensial leukosit. Data yang diperoleh di analisa secara deskriptif.
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Judul: Pengaruh penyuntikan bakteri secara intraperitoneal terhadap ikan lele lokal dan ikan lele dumbo
Abstrak: Aeromonas hydrophila penyebab terjadinya wabah. penyakit pada ikan lele Clarias batrachus, di Jawa (Kabata, 1985). Kasus-kasus penyakit ini sampai sekarang masih sering terjadi dalam usaha budidaya ikan lele. Oleh karena itu perlu dilakukan penelitian secara cermat tentang pengaruh bakteri Aeromonas hydrophila terhadap kerentanan ikan lele lokal dan dumbo. Penelitian ini bertujuan untuk melihat kerentanan ikan lele lokal (Clarias batrachus) dan lele dumbo (Clarias sp.) terhadap pengaruh penyuntikan Aeromonas hydrophila secara intraperitoneal. bakteri Penelitian ini dilakukan di kolam Balai Penelitian Perikanan Air Tawar Bogor, selama satu bulan. Ikan uji (lele lokal dan lele dumbo) berukuran ramoan, yaitu 7 10 cm, dengan padat penebaran sebanyak 84 ekor per kolam. Setiap kolam penelitian digunakan satu macam perlakuan. Untuk masing-masing perlakuan digunakan dua spesies ikan lele. Kolam berukuran 2.25 x 0.75 x 0.5 m³ Bakteri yang digunakan adalah bakteri Aeromonas hydrophila. Dosis bakteri yang digunakan adalah A = 1.42 x 103 10 bakteri/ikan, B 1.42 x 104 bakteri/ikan, c = 1.42 x 105 bakteri/ikan, D1.42 x 10° bakteri/ikan, E 1.42 x 107 bakteri/ikan. Perubahan tingkah laku ikan dan kematian ikan diamati setiap hari selama 22 hari. Identifikasi kembali bakteri dan pengamatan kelainan tubuh ikan dilakukan pada pasca penyuntikan hari ke 2, 3, 4, 7 dan 14, dengan pengambilan contoh ikan sebanyak 3 ekor tiap perlakuan. Sebagai data penunjang diukur parameter kualitas air setiap minggu yaitu amonia, pH, oksigen terlarut, alkalinitas, CO2 bebas, nitrit dan kesadahan diukur seminggu sekali. Sedangkan analisa data dilakukan secara deskriptif. ...
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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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