Judul: Potensi lipolitik bakteri asam laktat asal bekasam pada kuning telur puyuh
Abstrak: Telur merupakan sumber pangan dengan kadar lipid yang tinggi. Bakteri asam laktat (BAL) diketahui dapat menghasilkan enzim lipase yang berperan dalam memecah lipid menjadi asam lemak dan gliserol. Penelitian ini bertujuan memperoleh informasi kemampuan BAL asal bekasam mendegradasi lipid pada kuning telur puyuh. Enam dari delapan belas isolat BAL koleksi Desniar yang berhasil diremajakan diidentifikasi ulang dengan pewarnaan Gram, pewarnaan spora, uji motilitas, dan uji katalase. Isolat diuji kemampuan lipolitik pada media deMan Rogosa Sharpe Agar (MRSA) yang mengandung substrat kuning telur puyuh 1% dan indikator rhodamin B lalu diinkubasi anaerob selama 24 jam dan diamati di bawah sinar ultraviolet. Seluruh isolat berpendar oranye menunjukkan adanya potensi lipase. Isolat terpilih untuk tahap berikutnya adalah isolat BP(3). Isolat BP(3) merupakan Pediococcus pentosaceous. Tahap berikutnya adalah penentuan kurva pertumbuhan dan aktivitas unit lipase pada media deMan Rogosa Sharpe Booth (MRSB) mengandung substrat minyak zaitun 1% selama 48 jam. P. pentosaceous mengalami fase eksponensial pertumbuhan hingga jam ke-20 inkubasi. Aktivitas unit lipase P. pentosaceous cenderung stabil sepanjang inkubasi. Penelitian menunjukkan isolat BP(3) (P. pentosaceous) asal bekasam memiliki potensi lipolitik pada kuning telur puyuh.
Keyword: lipase, rhodamine B, lactic acid bacteria, quail egg yolk, Kemampuan BAL, Biological science, Peremajaan isolat bakteri

Judul: Lipase Bakteri Asam Laktat Asal Bekasam Pendegradasi Lipid pada Susu Sapi
Abstrak: Susu sapi full cream memiliki kandungan asam lemak jenuh yang tinggi, jika dikonsumsi berlebih dapat menyebabkan hiperlipidemia. Enzim lipase berperan menghidrolisis lipid menjadi asam lemak dan gliserol. Bakteri asam laktat (BAL) merupakan salah satu bakteri penghasil enzim lipase yang dominan ditemukan pada bekasam. Penelitian ini bertujuan memperoleh isolat BAL asal bekasam yang memiliki potensi sebagai pendegradasi lipid pada substrat susu sapi. Sebanyak 18 isolat BAL koleksi Desniar diremajakan kembali pada media MRSA. Sebanyak 6 isolat terpilih dilakukan uji kemampuan penghasil lipase pendegradasi lipid pada media MRSA yang mengandung susu sapi 1% dan rhodamin B 0.002 %. Staphylococcus aureus digunakan sebagai kontrol positif dan Eschericia coli digunakan sebagai kontrol negatif. Dari keenam isolat yang diuji, isolat Lactobacillus plantarum memberikan hasil pendaran terkuat ketika dideteksi dibawah sinar UV. Berdasarkan hasil aktivitas lipase, diperoleh nilai aktivitas unit lipase sebesar 0.555 unit per mL pada jam ke-16. Hasil penelitian ini diharapkan L. plantarum dapat berperan dalam menjaga kesehatan.
Keyword: bekasam, Lactobacillus plantarum, lipase, rhodamine B

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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