Judul: Karakteristik Fisik dan Antimikroba Selulosa Mikrobial yang Mengandung Ekstrak Kopi Robusta sebagai Pembalut Luka Primer.
Abstrak: Selulosa mikrobial merupakan selulosa yang diperoleh dari biosintesis glukosa Acetobacter xylinum yang besifat nontoksik, tidak menimbulkan alergi, kuat tarik tinggi, biodegradable, biocompatible, mampu menyaring bakteri, mempunyai daya absorbsi yang tinggi, dan mampu mendonasikan cairan. Ekstrak kopi robusta mengandung senyawa polifenol sebagai antioksidan dan mempunyai sifat antibakteri terhadap Staphylococcus aureus. Selulosa mikrobial dan ekstrak kopi robusta dapat dijadikan sebagai bahan pembalut luka primer dengan menjaga suhu dan kelembaban di sekitar luka. Tujuan penelitian ini adalah mengetahui karakteristik fisik dan antimikrobial film selulosa mikrobial yang mengandung ekstrak kopi robusta sebagai pembalut luka primer. Pembalut luka dibuat dengan penyisipan ekstrak kopi robusta non-dekafeinasi dan dekafeinasi dengan konsentrasi (b/v) 22.5%, 45%, dan 90% dalam etanol 75%. Peningkatan konsentrasi ekstrak kopi robusta non-dekafeinasi dan dekafeinasi yang dilarutkan dalam etanol 75% dapat mengakibatkan terjadinya peningkatan kemampuan absorbsi cairan, dan daya hambat bakteri Staphylococcus aureus, serta penurunan kemampuan donasi cairan. Berdasarkan penampakan dan tekstur pembalut luka, serta tinjauan efek kafein dalam penyembuhan luka, pengunaan ekstrak kopi dekafeinasi menunjukkan karakteristik lebih baik sebagai pembalut luka primer.
Keyword: selulosa mikrobial, ekstrak kopi robusta, pembalut luka primer

Judul: Process Design and Physicochemical  Characterics of Arabica Coffee (Coffea arabica) Skin Extract
Abstrak: Kulit kopi memiliki kandungan yang sangat bermanfaat bagi tubuh. Kulit kopi dihasilkan dari pengolahan kopi yang menghasilkan sekitar 50% kulit kopi dari hasil panen cherry kopi. Salah satu kandungan kulit kopi yang sangat bermanfaat adalah asam klorogenat yang dapat berguna sebagai antioksidan. Tujuan penelitian ini adalah merancang desain proses ekstraksi komponen bahan aktif kulit kopi dan mengkarakteristik komposisi fisikokimia ekstrak kulit kopi. Penelitian ini dilakukan dengan tahapan desain keteknikan yang terdiri dari tahap eksplorasi, pendefinisian masalah, ideasi, pengembangan prototipe, dan validasi. Uji proksimat menunjukkan kandungan tertinggi dalam kulit kopi adalah karbohidrat sebesar 25,637% dan serat kasar 39,894%. Kulit kopi kemudian dimaserasi dengan 3 iterasi yakni iterasi 0 tanpa perlakuan, iterasi 1 dengan penggunaan selulase serta iterasi 2 dengan kombinasi penggunaan selulase dan pektinase. Iterasi 2 memberikan hasil ekstrak dengan kadar antioksidan paling baik yakni 1,21µg/ml. Desain proses ekstraksi yang dihasilkan adalah pengecilan kulit kopi, pelarutan menggunakan air, penambahan enzim pektinase dan selulase, maserasi selama 24 jam pada suhu kamar, filtrasi, dan mendapatkan ekstrak kulit kopi., Coffee skin has very beneficial content for the body. Coffee skin was produced from coffee processing which produced about 50-60%% of coffee skin from the coffee cherry harvest. One of the most beneficial contents of coffee skin was chlorogenic acid which could be useful as an antioxidant. The purpose of this research was to design the process of extracting the active ingredient components of coffee skin and characterizing the physicochemical composition of coffee skin extract. This research was conducted with engineering design stages consisting of exploration, problem definition, ideation, prototype development, and validation. Proximate test showed that the highest content in coffee skin was carbohydrate at 25.637% and crude fiber at 39.894%. The coffee skin was then macerated with 3 iterations, iteration 0 without treatment, iteration 1 with the use of cellulase and iteration 2 with a combination of cellulase and pectinase. Iteration 2 gave the extract with the best antioxidant content of 1.21µg/ml. The design of the resulting extraction process was the reduction of coffee skin, dissolving using water, adding pectinase and cellulase enzymes, maceration for 24 hours at room temperature, filtration, and obtaining coffee skin extract.
Keyword: Coffee skin, extraction, enzyme, antioxidant, design engineering

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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