Judul: Aktivitas Antioksidan Ekstrak Buah Bakau Api-api Putih (Avicennia marina) dan Aplikasinya pada Susu
Abstrak: Buah mangrove A. marina mengandung senyawa bioaktif sebagai antioksidan alami yang dapat dimanfaatkan dalam produk pangan susu. Penambahan ekstrak buah A. marina meningkatkan zat aktif pada susu. Penelitian ini bertujuan mendapatkan produk pangan yang mengandung antioksidan alami dengan penambahan ekstrak buah A. marina serta mendapatkan perlakuan terbaik. Penelitian ini dilakukan dengan metode ekstraksi maserasi dan perebusan sebanyak 2 ulangan, serta menggunakan Rancangan Acak Lengkap (RAL) dengan faktor konsentrasi ekstrak buah A. marina, dan metode ekstraksi. Hasil ekstrak perebusan (IC50= 59.58 ± 8.62 ppm) mempunyai aktivitas antioksidan lebih tinggi dibandingkan hasil ekstrak maserasi (IC50= 80.09 ± 6.70 ppm). Penambahan ekstrak ke dalam susu menyebabkan rasa susu sedikit pahit dan warna susu menjadi merah muda. Senyawa aktif pada susu ekstrak buah A. marina, yaitu alkaloid, flavonoid, saponin, dan tanin. Komposisi kimia dan cemaran mikroba pada susu ekstrak buah A. marina di bawah batas yang ditentukan dalam SNI 2970:2015. Aktivitas antioksidan dan penerimaan sensori terbaik pada perlakuan susu dengan ekstrak rebus 0.5%.
Keyword: Avicennia marina, aktivitas antioksidan, susu

Judul: Aktivitas Antioksidan, Toksisitas dan Kadar Logam Berat Ekstrak Buah Avicennia marina.
Abstrak: Avicennia marina merupakan salah satu jenis tumbuhan bakau yang banyak tumbuh di perairan Indonesia. Bagian buah A. marina dapat dimanfaatkan menjadi ekstrak dan berpotensi sebagai sumber antioksidan alami yang dapat meredam radikal bebas. Tujuan penelitian ini untuk mendapatkan ekstrak buah A. marina dengan tingkat kepolaran pelarut yang berbeda antara lain metanol, etil asetat dan n-hekasana serta mengevaluasi komponen aktif, aktivitas antioksidan, toksisitas dan kadar logam berat. Senyawa aktif diekstraksi menggunakan metode maserasi dan aktivitas antioksidan menggunakan metode DPPH. Metanol menghasilkan rendemen lebih tinggi dibandingkan pelarut lainnya dengan rendemen ekstrak 5.72±0.73%. Perbedaan ekstrak dipengaruhi oleh aktivitas antioksidan dimana ekstrak metanol memiliki aktivitas antioksidan tertinggi (46.11±5.63 ppm) dengan senyawa fitokimia saponin, flavonoid, tanin dan fenol hidrokuinon. Brine Shrimp Lethal Test semua ekstrak dikategorikan toksik dengan LC50 84.50-158.65 ppm. Kandungan logam berat ekstrak masih di bawah batas standar Persyaratan Kualitas Obat Tradisional oleh BPOM Nomor 12 tahun 2014.
Keyword: Aktivitas antioksidan, Avicennia marina, logam berat, toksisitas

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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