Judul: Profil asam amino kerang bulu (Anadara antiquata)
Abstrak: Kerang bulu (Anadara antiquata) merupakan salah satu biota laut yang sampai saat ini keberadaanya belum termanfaatkan secara optimal. Salah satu upaya yang dapat dilakukan untuk meningkatkan nilai tambah dari kerang bulu adalah dengan melakukan penelitiaan lebih lanjut mengenai kandungan asam amino yang terkandung di dalam kerang bulu. Penelitian ini bertujuan untuk mengetahui jenis dan jumlah asam amino yang terdapat pada daging dan jeroan kerang bulu. Komposisi kimia kerang bulu diuji dengan metode analisis proksimat. Kandungan asam amino daging dan jeroan kerang bulu dapat diuji dengan HPLC (High Performanced Liquid Chromatografy). Komposisi kimia daging kerang bulu terdiri dari kadar air 79,69%, abu 1,57%, lemak 2,29%, protein 12,89% dan karbohidrat 3,56%. Komposisi kimia jeroan kerang bulu terdiri atas kadar air 81,50%, abu 1,99%, lemak 4,60%, protein 10,13%, dan karbohidrat 1,78%. Daging dan jeroan kerang bulu mengandung 15 asam amino yang terdiri atas 9 asam amino esensial dan 6 asam amino non esensial. Kandungan asam amino yang paling tinggi pada daging dan jeroan kerang bulu adalah asam glutamat dengan nilai 1,74% dan 1,22%. Asam amino yang terdapat dalam jumlah paling sedikit pada daging dan jeroan kerang bulu adalah histidin dengan nilai 0,15%. Kata kunci: asam amino esensial, asam amino non esensial, kerang bulu (Anadara antiquata).
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Judul: Karakteristik asam lemak kerang bulu (Anadara antiquata)
Abstrak: Kerang bulu merupakan salah satu biota laut yang banyak dikonsumsi, namun belum banyak informasi mengenai kandungan gizi yang terdapat dalam kerang ini. Penelitian ini bertujuan untuk menentukan karakteristik dan komposisi asam lemak kerang bulu (Anadara antiquata). Komposisi kimia diuji dengan metode oven, soxhlet dan kjeldahl. Kandungan asam lemak daging utuh dan tanpa jeroan diuji menggunakan GC (Gas Chromatography). Komposisi kimia daging utuh terdiri atas kadar air 80,43%; abu 1,90%; lemak 0,85%; protein 9,72%; dan karbohidrat 7,10%, sedangkan daging tanpa jeroan yaitu kadar air 79,69%; abu 1,57%; lemak 2,29%; protein 12,89%; dan karbohidrat 3,56%. Kandungan asam lemak daging utuh dan tanpa jeroan kerang bulu berturut-turut, yaitu asam laurat 0,02% dan 0,02%; miristat 1,75% dan 1,61%; palmitat 5,82% dan 5,67%; palmitoleat 2,42% dan 2,36%; stearat 3,35% dan 3,29%; oleat 1,65% dan 1,51%; linoleat 0,63% dan 0,58%; linolenat 0,13% dan 0,12%; arakhidonat 2,36% dan 1,96%; EPA 5,25% dan 4,06% serta DHA 4,13% dan 3,40%. Kerang bulu memiliki kandungan gizi yang tinggi sehingga perlu ditingkatkan nilai tambahnya. Kata kunci: Anadara antiquata, asam lemak, proksimat
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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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