Judul: Masculinization of Freshwater Prawn Macrobrachium rosenbergii in Immersion of Pine Pollen Pinus tabulaeformis
Abstrak: Tantangan utama produksi udang galah Macrobrachium rosenbergii adalah sifat kanibalisme dan variasi ukuran yang terdapat pada udang galah jantan. Produksi monoseks udang galah betina menjadi pilihan untuk menghasilkan ukuran udang yang seragam dan tingkat kelangsungan hidup tinggi. Udang galah jantan fungsional neomale dibutuhkan untuk menghasilkan monoseks udang galah betina melalui perkawinan. Penelitian ini bertujuan mengevaluasi efektivitas penggunaan fitosteroid dari serbuk sari pinus Pinus tabulaeformis melalui perendaman larva untuk maskulinisasi udang galah menjadi jantan fungsional neomale. Empat perlakuan dengan tiga ulangan, terdiri dari ekstrak serbuk sari pinus 0,2 mL L-1; 0,4 mL L-1; 0,6 mL L-1; dan kontrol tanpa perendaman. Perendaman dilakukan selama 24 jam pada postlarva 15 udang galah dengan bobot 0,02 ± 0,001 g dan panjang 12 ± 0,3 mm. Pemeliharaan paska perendaman dilakukan selama 45 hari. Hasil penelitian menunjukkan bahwa perlakuan dosis serbuk sari pinus menghasilkan nisbah kelamin jantan berkisar 35-47% dan tidak berbeda nyata dengan kontrol (P > 0.05) demikian juga dengan tingkat kelangsungan hidupnya. Penggunaan ekstrak serbuk sari pinus Pinus tabulaeformis melalui perendaman larva udang galah Macrobrachium rosenbergii hingga dosis 0,6 mL L-1 tidak efektif terhadap pembentukan udang jantan fungsional neomale.
Keyword: Macrobrachium rosenbergii, Maskulinisasi, Serbuk Sari Pinus

Judul: Efektifitas Ekstrak Teripang Pasir yang Telah Diformulasikan terhadap Maskulinisasi Udang Galah
Abstrak: yang sudah diformulasikan untuk sex reversal juvenil udang galah (Macrobrachium rosenbergii de Man) pada saat sebelum perubahan kelamin. Ekstrak teripang pasir merupakan alternatif hormon alamiah pengganti hormon sintetik dan bahan kimia lainnya dalam sex reversal. Perlakuan pemberian ekstrak teripang dengan metode dipping saat fase juvenil-satu udang galah atau 29 hari setelah menetas pada berbagai dosis dan dikombinasikan dengan tingkatan waktu perendaman yaitu 12, 24, dan 36 jam. Setelah 30 hari juvenil udang galah dipelihara, dilakukan analisis kadar testosteron dalam hemolymph. Pada dosis 10, 15, 25 mg/l dengan waktu perendaman 12, 24 dan 36 jam, secara umum baik ekstrak segar yang telah diformulasi maupun yang telah disimpan selama 30 hari dan juga telah diformulasi, mampu meningkatkan jumlah jantan. Pemberian 25 mg/l ekstrak teripang dengan waktu perendaman 36 jam, menghasilkan jumlah jantan tertinggi (66,66-67,31%). Ekstrak teripang pasir berpengaruh terhadap SR juvenil udang galah.
Keyword: Macrobrachium rosenbergii de Man, Sex reversal, Monosex culture, Echinodermata, Macrobrachium rosenbergii

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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