Judul: Pengaruh Askorbil Fosfat Magnesium Sebagai Sumber Vitamin C Terhadap Perkembangan Ovarium dan Penampilan Larva Ikan Nila (Oreochromis sp.)
Abstrak: Saat ini pola pembenihan ikan air tawar masih dilakukan secara ekstensif dengan mengandaikan lingkungan alami dan pakan yang mutunya masih rendah. Kondisi seperti ini tidak menjamin kemampuan produksi benih yang tinggi, padahal permintaan benih sangat besar untuk memasok budidaya intensif yang sudah rneluas di peraian umum (waduk). Beberapa percobaan telah memperlihatkan bahwa induk ikan yang dicukupi kebutuhan nutrisinya (protein dan lemak) kemampuan reproduksinya akan meningkat. Informasi kebutuhan nutrisi lainnya seperti vitamin untuk reproduksi masih sangat terbatas.
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Judul: Studi Pustaka Suplementasi Magnesium pada Pakan untuk Pertumbuhan Ikan Nila Oreochromis sp.
Abstrak: Mineral merupakan suatu elemen anorganik yang diperlukan hewan untuk mempertahankan berbagai fungsi metabolik. Mineral berperan penting pada fungsi enzim termasuk di dalamnya berperan dalam sistem pencernaan, keseimbangan asam basa, pertukaran gas, dan osmoregulasi. Mg beserta ikatannya banyak terlibat dalam berbagai peran berbeda dalam alur metabolisme protein, lemak, karbohidrat, dan reaksi enzimatis. Studi pustaka ini bertujuan memvalidasi dan menganalisis dosis magnesium terbaik yang ditambahkan pada pakan untuk performa pertumbuhan ikan nila Oreochromis sp., berdasarkan laporan hasil-hasil penelitian yang sudah dilakukan. Sumber pustaka didapatkan dari pustaka nasional dan internasional. Hasil studi pustaka ini menunjukkan suplementasi Mg memberikan dampak positif pada pertumbuhan ikan nila. Kebutuhan Mg pada pakan ikan nila (Oreochromis sp.) dipengaruhi oleh spesies dan ukuran ikan, sumber, serta kandungan mineral pada pakan dan kondisi lingkungan budidaya. Dosis optimum suplementasi Mg pada ikan nila Oreochromis sp. adalah 0,62 g kg-1 berdasarkan hasil analisis regresi kuadratik orde-2 yang berada di rentang 0,5-1,02 g kg-1., Minerals are inorganic elements that animals need to maintain various metabolic functions. Minerals plan an important role in enzyme function, including their role in digestion system, acid-base balance, gas exchange, and osmoregulation. Mg and its mixtures are involved in many different roles in the metabolic pathways of proteins, fats, carbohydrates, and enzymatic reactions. This literature study aims to validate and analyze the best dose of magnesium added to feed for the growth performance of tilapia Oreochromis sp., based on reports of research results that have been carried out. Literature sources were obtained from national and international literatures. The result of this literature study show that Mg supplementation has a positive impact on the growth of tilapia. Mg requirements of tilapia (Oreochromis sp.) is influenced by species and size of the fish, source, and content of the mineral in feed and culture environment. The optimum dose of Mg supplementation for tilapia Oreochromis sp. are 0.62 g kg-1 based on 2nd order quadratic regression analysis which is in the range of 0.5-1.02 g kg-1.
Keyword: dose, growth, magnesium, mineral, tilapia, dosis, magnesium, mineral, nila, pertumbuhan

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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