Judul: Karakteristik Kimia dan Mikrobiologi Yoghurt Probiotik Susu Kambing dengan Penambahan Ekstrak Bunga Rosella (Hibiscus sabdariffa L)
Abstrak: Susu kambing mengandung nutrisi yang lebih tinggi dibandingkan susu sapi, akan tetapi memiliki bau prengus sehingga kurang diminati oleh masyarakat. Pengolahan susu kambing menjadi yoghurt dapat menghilangkan bau prengus dan dapat meningkatkan kandungan nutrisi susu. Bunga rosella (Hibiscus sabdariffa L) kaya antioksidan. Penambahan ekstrak bunga rosella pada yoghurt akan memberikan rasa asam yang menyegarkan, aroma yang wangi serta dapat meningkatkan kesehatan manusia. Tujuan penelitian ini adalah mempelajari karakteristik kimia dan mikrobiologi yoghurt probiotik berbahan dasar susu kambing segar dengan penambahan ekstrak bunga rosella. Yoghurt probiotik dengan penambahan ekstrak bunga rosella sebesar 0.5% dan 1% masing-masing diamati karakteristik kimia dan mikrobiologi. Hasil analisis menunjukkan bahwa penambahan ekstrak bunga rosella tidak berpengaruh nyata terhadap karakteristik kimia yoghurt dilihat dari nilai pH, TAT, kadar air, kadar protein, kadar abu, dan kadar lemak, akan tetapi berbeda sangat nyata pada jumlah bakteri asam laktat pada produk (P<0.01).
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Judul: Karakteristik Yoghurt Probiotik Dengan Penambahan Ekstrak Bunga Rosella (Hibiscus Sabdariffa L) Selama Penyimpanan Suhu Dingin.
Abstrak: Yoghurt umumnya dibuat dengan menggunakan dua jenis bakteri asam laktat (BAL) yaitu Lactobacillus bulgaricus dan Streptococcus thermophilus sebagai starter. Namun, kedua bakteri asam laktat (BAL) yang digunakan dalam pembuatan yoghurt ini tidak bisa hidup dalam lingkungan yang keasamannya sangat tinggi. Yoghurt probiotik perlu dikembangkan, dengan menambahkan bakteri asam laktat (BAL) yang bersifat probiotik, misalnya Lactobacillus acidophilus, Lactobacillus casei, dan Bifidobacterium. Bunga rosella (Hibiscus sabdariffa L) kaya antioksidan. Penambahan ekstrak bunga rosella pada yoghurt dapat meningkatkan kesehatan manusia. Ekstrak bunga rosella memiliki pH sebesar 2.238. Tujuan penelitian ini adalah untuk mempelajari pengaruh penyimpanan suhu dingin (2-4°C) terhadap karakteristik fisik, kimia, mikrobiologi dan organoleptik yoghurt probiotik dengan penambahan ekstrak bunga rosella (Hibiscus sabdariffa L) sebanyak 1%. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) Faktorial, kemudian dilakukan uji Tukey dan data non parametrik menggunakan uji Kruskal Wallis. Hasil analisis menunjukkan bahwa terjadi interkasi (P<0.05) antara jenis yoghurt dan lama waktu penyimpanan terhadap nilai pH. Nilai pH terendah dihasilkan dari yoghurt probiotik dengan penambahan ekstrak bunga rosella. Jenis yoghurt dan lama penyimpanan yang berbeda berpengaruh nyata (P<0.05) terhadap viskositas, total bakteri asam laktat (BAL), total asam tertitrasi (TAT), warna dan rasa.
Keyword: bunga rosella, penyimpanan suhu dingin, probiotik, yoghurt

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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