Judul: Aktivitas Antioksidan Ekstrak Buah Lindur (Bruguiera gymnorrhiza) dengan Usia Panen Berbeda
Abstrak: Ekstrak buah lindur (Bruguiera gymnorrhiza) memiliki potensi sebagai sumber aktivitas antioksidan alami. Tujuan penelitian ini adalah untuk menentukan kandungan bioaktif, total fenol, dan aktivitas antioksidan pada usia panen berbeda dengan berbagai pengujian secara in vitro. Buah lindur memiliki kadar karbohidrat 29,64±0,50%, kadar air 67,89±0,55%, protein 1,76±0,04%, lemak 0,32±0,10% dan abu 1,30±0,13%. Rendemen buah lindur usia panen 6 bulan lebih tinggi dibandingkan buah usia panen 3 bulan dengan nilai masingmasing 4,91±0,05% dan 4,64±0,24%. Nilai aktivitas antioksidan buah lindur usia panen 3 dan 6 bulan dengan metode 1,1-diphenyl–2–picrylhydrazy (DPPH) yaitu 170,56±3,62 ppm dan 82,38±0,06 ppm, pada metode Cupric ion reducing antioxidant capacity (CUPRAC) 168,2±0,21 mg asam askorbat/L dan 185,9±0,71 mg asam askorbat/L, pada metode 2,2-Azinobis 3-etil benzatiazolin-asam sufat (ABTS) 24,89±0,63 ppm dan 16,11±0,95 ppm, dan pada metode total fenol 667,03±4,41 mg GAE/g dan 722,45±1,90 mg GAE/g.
Keyword: Buah Lindur Bruguiera gymnorrhiza, ekstraksi, komposisi kimia senyawa bioaktif

Judul: Aktivitas Antioksidan Ekstrak Buah Lindur (Bruguiera gymnorrhiza) dengan Cara Pengeringan yang Berbeda
Abstrak: Ekstrak buah lindur (Bruguiera gymnorrhiza) memiliki potensi sebagai sumber antioksidan alami. Kandungan antioksidan memiliki keterkaitan erat dengan kandungan senyawa fenolik pada tumbuhan. Penelitian ini bertujuan untuk menentukan pengaruh cara pengeringan terhadap kadar fenol total dan aktivitas antioksidan buah lindur dengan berbagai metode analisis in-vitro. Cara pengeringan yang digunakan yaitu pengeringan oven suhu 40oC dan matahari. Hasil penelitian menunjukkan bahwa cara pengeringan mempengaruhi rendemen ekstrak, komponen bioaktif, fenol total, dan aktivitas antioksidan ekstrak buah lindur. Cara pengeringan terbaik yang menghasilkan kadar fenol total dan aktivitas antioksidan tertinggi terdapat pada ekstrak buah lindur kering oven suhu 40oC.
Keyword: Antioksidan, Bruguiera gymnorrhiza, fenol total, pengeringan

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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