Judul: Penggunaan Fikoloid Hasil Ekstraksi Rumput Laut sebagai Substitusi Gelatin pada Eskrim
Abstrak: Fikoloid atau yang dikenal dengan hidrokoloid merupakan komponen primer rumput laut. Fikokoloid dapat digunakan sebagai bahan penstabil es krim tetapi selama ini yang sering dan umum digunakan untuk proses es krim adalah gelatin.
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Judul: Akselerasi Ekstraksi Pigmen Fikoeritrin Rumput Laut Kappaphycus alvarezii dengan Metode Gelombang Ultrasonik.
Abstrak: Kappaphycus alvarezii merupakan jenis rumput laut yang banyak dibudidayakan di Indonesia karena dapat dimanfaatkan sebagai bahan baku karagenan. K. alvarezii mengandung fikobiliprotein, terutama pigmen fikoeritrin. Pigmen fikoeritrin merupakan pigmen pemanen cahaya pada alga merah yang dimanfaatkan sebagai pewarna alami. Tujuan penelitian ini adalah menentukan pengaruh waktu ekstraksi dengan gelombang ultrasonik serta adanya presipitasi ammonium sulfat dengan saturasi 60 % terhadap karakteristik fikoeritrin. Absorbansi maksimum terbentuk pada panjang gelombang 498.5, 534, dan 564 nm. Ekstraksi dengan ultrasonik selama 60 menit dan presipitasi ammonium sulfat saturasi 60 % merupakan perlakuan terbaik yang memiliki konsentrasi pigmen, yaitu 2.1554 mg/mL, purity index 1.2445, serta konsentrasi protein 0.5918 mg/mL. Aktivitas antioksidan pigmen fikoeritrin termasuk kategori kuat hingga sangat kuat. Asam aspartat memiliki nilai tertinggi pada profil asam amino pigmen fikoeritrin. Profil protein dengan SDS-Page menunjukkan fikoeritrin memiliki bobot molekul 20 kDa pada subunit α, 21 kDa pada subunit β, dan 30 kDa pada subunit ɣ.
Keyword: fikoeritrin, gelombang ultrasonik, Kappaphycus alvarezii, presipitasi

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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