Judul: Identifikasi bakteri asam laktat dari nira lontar serta aplikasinya dalam mereduksi Salmonella Typhimurium dan Aspergillus flavus pada biji kakao
Abstrak: Nira lontar adalah cairan yang dihasilkan dari mayang bunga jantan pohon lontar (Borasus flabellifer. L). Nira mengandung banyak gula, sekitar 13% dan komponen nutrisilain yang sangat potensial untuk pertumbuhan mikroorganisme. Setelah beberapa jam turun sadap, cairan nira mulai mengalami fermentasi spontan yang melibatkan berbagai jenis BAL.
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Judul: Seleksi dan Identifikasi Bakteri Asam Laktat Potensial Asal Fermentasi Kakao (Theobroma cacao).
Abstrak: Fermentasi kakao merupakan proses penting untuk memperoleh cita rasa dan aroma yang khas serta menghilangkan rasa pahit. Organisme yang bertanggung jawab dalam fermentasi salah satunya adalah kelompok bakteri asam laktat (BAL). Produk utama dari fermentasi karbohidrat BAL adalah asam laktat. Kemampuan produksi asam laktat ini pun sangat dipengaruhi oleh kemampuan BAL untuk bertahan dalam berbagai kondisi fermentasi. Penelitian ini bertujuan mengidentifikasi BAL asal fermentasi kakao yang paling resisten terhadap berbagai kondisi fermentasi dan dapat memproduksi kadar asam laktat yang tinggi. BAL yang telah diisolasi dari kakao kemudian diseleksi melalui beberapa tahap. Seleksi tersebut meliputi uji total asam, ketahanan terhadap etanol dan suhu tinggi. Kurva pertumbuhan ditentukan selama 24 jam dan identifikasi molekuler menggunakan 16SrRNA ditentukan pada isolat yang terpilih. Hasil penelitian menunjukan isolat BAL terpilih teridentifikasi sebagai Lactobacillus plantarum dengan produksi total asam mencapai 17,23 mg/mL. Isolat tersebut dapat tumbuh pada media dengan etanol mencapai 10% pada suhu 37ºC dandapat tumbuh pada suhutinggi yakni 45ºC pada medium tanpa cekaman etanol.
Keyword: bakteri asam laktat, fermentasi, resisten etanol, Lactobacillus plantarum

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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