Judul: Aktivitas Antioksidan dan kompenen bioaktif Ubur-ubur (Aurelia aurita)
Abstrak: Tujuan penelitian ini adalah untuk menentukan aktivitas antioksidan dan komponen bioaktif pada ubur-ubur (Aurelia aurita). Aktivitas antioksidan diuji menggunakan metode DPPH dan komponen bioaktif menggunakan metode Harborne. Ubur-ubur memiliki rendemen payung (59%), tentakel (37%) dan jeroan (4%), yang sangat potensial dan ekonomis untuk dimanfaatkan lebih lanjut. Payung dan tentakel ubur-ubur kering ini mengandung air yang cukup tinggi (payung 68,67% dan tentakel 73,56%), lemak (payung 0,29% dan tentakel 4,55%), protein (payung 11,09% dan tentakel 6,68%), abu yang tinggi (payung 12,81% dan tentakel 14,77%) dan karbohidrat (payung 7,13% dan tentakel 0,42%). Ekstrak nheksan payung dan tentakel ubur-ubur kering memiliki aktivitas antioksidan yang lebih besar dari dua ekstrak yang lainnya, ditandai dengan nilai IC50-nya yang terkecil, yaitu 1.401,03 dan 1.357,25 ppm. Ekstrak kasar payung dan tentakel ubur-ubur kering memiliki aktivitas antioksidan yang sangat lemah jika dibandingkan dengan aktivitas antioksidan asam askorbat. Komponen bioaktif yang terdeteksi pada ekstrak kasar payung ubur-ubur kering adalah saponin dan pada tentakel terdeteksi komponen alkaloid, triterfenoid, dan saponin.
Keyword: ubur-ubur (Aurelia aurita), proksimat, antioksidan, komponen bioaktif

Judul: Kandungan Mineral Makro-Mikro dan Vitamin B12 Ubur-ubur (Aurelia aurita) Segar dan Kering
Abstrak: Aurelia aurita adalah jenis ubur-ubur yang banyak terdapat di pantai utara Cirebon. Ubur-ubur merupakan biota perairan yang diduga memiliki kandung gizi tinggi. Tujuan penelitian ini adalah untuk menentukan kandungan mineral makro dan mikro serta vitamin B 12 pada ubur-ubur (Aurelia aurita) segar dan kering. Kandungan mineral kalsium (Ca, magnesium (Mg), natrium (Na), kalium (K), besi (Fe), tembaga (Cu), seng (Zn), dan iodium (I) turun setelah diolah menjadi payung ubur-ubur kering. Kandungan mineral makro paling tinggi pada ubur-ubur segar dan kering adalah natrium yaitu 180092,1 ppm berat kering (bk) dan 111209,4 ppm (bk), dan yang paling rendah adalah kalsium yaitu 5750,2 ppm (bk) dan 11,1 ppm (bk). Kandungan mineral mikro paling tinggi pada payung ubur-ubur segar dan kering adalah iodium yaitu 8291,5 ppm (bk) dan 1800 ppm (bk), dan yang paling rendah adalah tembaga yaitu 1,1 ppm (bk) dan 0,6 ppm (bk). Kandungan vitamin B 12 payung ubur-ubur segar adalah 396,6 μm/100g (bk) dan turun menjadi 63,5 μm/100g (bk) pada payung ubur-ubur kering.
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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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