Judul: Ekstrak Daun Tanaman Lindur (Bruguiera gymnorrhiza) sebagai Antidiare
Abstrak: Bruguiera gymnorrhiza yang dikenal dengan nama lindur merupakan salah satu vegetasi mangrove yang dapat digunakan untuk mengobati diare. Tujuan penelitian ini adalah menentukan rendemen ekstrak kasar, mengidentifikasi komponen aktif dan mengevaluasi aktivitas antibakteri terhadap bakteri penyebab diare pada ekstrak daun lindur hasil ekstraksi tunggal dan ekstraksi bertingkat, serta menentukan kandungan total fenol ekstrak daun lindur hasil ekstraksi tunggal. Rendemen ekstrak etanol daun lindur hasil ekstraksi tunggal sebesar 14,68%. Rendemen ekstrak n-heksana, ekstrak etil asetat dan ekstrak etanol hasil ekstraksi bertingkat masing-masing sebesar 3,56%, 1,93% dan 7,36%. Komponen aktif yang terdapat pada seluruh ekstrak kasar daun lindur adalah steroid dan flavonoid. Ekstrak etanol daun lindur hasil ekstraksi tunggal dan ekstrak etil asetat hasil ekstraksi bertingkat memiliki aktivitas antibakteri yang tertinggi terhadap bakteri Staphylococcus aureus ATCC 6538. Kandungan total fenol ekstrak etanol daun lindur hasil ekstraksi tunggal sebesar 16,59 mgGAE/g ekstrak.
Keyword: antibakteri, B gymnorrhiza, daun, diare, zona bening

Judul: Aktivitas Antioksidan Ekstrak Daun Lindur (Bruguiera gymnorrhiza) dengan Teknik Pengeringan Berbeda.
Abstrak: Daun lindur (Bruguiera gymnorrhiza) memiliki potensi sebagai sumber antioksidan alami. Kandungan aktivitas antioksidan berkaitan dengan kandungan senyawa fenolik. Penelitian bertujuan untuk menentukan kandungan kimia dan pengaruh pengeringan terhadap total fenol dan aktivitas antioksidan daun lindur (B. gymnorrhiza). Metode pengeringan yang digunakan adalah kering matahari dan kering oven 40–60 oC. Hasil penelitian menunjukkan bahwa pengeringan mempengaruhi rendemen ekstrak, total fenol dan aktivitas antioksidan daun lindur (Bruguiera gymnorrhiza). Perlakuan pengeringan terbaik yaitu kering matahari yang menghasilkan total fenol dan aktivitas antioksidan tertinggi. Total fenol daun lindur kering matahari sebesar 1 633.74 mgGAE/g dengan rendemen 10.478%. Aktivitas antioksidan DPPH, ABTS, dan CUPRAC pada ekstrak daun lindur kering matahari masing-masing 50.64 ppm (tergolong kuat); 35.48%; dan 87.59 mg asam askorbat/g ekstrak. Pengeringan dengan oven 40-60 oC dengan suhu stabil dan cenderung mengalami pelemahan aktivitas antioksidan serta kerusakan total fenol.
Keyword: antioksidan, Bruguiera gymnorrhiza, pengeringan, total fenol

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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