Judul: Pengaruh Suplementasi Vitamin C dan Multivitamin Mineral Terhadap Status Gizi, Kesehatan, dan Fungsi Ginjal
Abstrak: Saat ini penggunaan suplemen semakin meningkat, dan sepertinya akan terus menerus bertambah (NIH State of the Science Panel 2007). Pada umumnya, konsumen mempercayai bahwa suplemen dapat membuat mereka berada dalam kondisi yang lebih baik, memberikan tambahan energi, meningkatkan kesehatan, serta mencegah dan mengobati penyakit. Menurut beberapa penelitian, masyarakat yang mengkonsumsi suplemen vitamin C dan multivitamin mineral (MVM) cenderung memiliki asupan mikronutrien dari makanan yang lebih tinggi dibandingkan masyarakat yang tidak mengkonsumsi suplemen. Asupan tambahan yang diperoleh dari suplemen kemungkinan dapat melebihi batas maksimum yang diperbolehkan (tolerable upper intake level/UL). Berdasarkan hal tersebut, perlu adanya suatu kajian mengenai keamanan suplemen vitamin C dan MVM agar dalam pelaksanaannya tidak terjadi hal yang membahayakan bagi konsumen suplemen tersebut. Penelitian ini bertujuan untuk: (1) menganalisis konsumsi dan tingkat konsumsi; (2) menganalisis pengaruh suplementasi vitamin C dan MVM terhadap status gizi berdasarkan indeks massa tubuh (IMT); (3) menganalisis pengaruh suplementasi vitamin C dan MVM terhadap status kesehatan berdasarkan keluhan, lama sakit, dan tekanan darah; (4) menganalisis pengaruh suplementasi vitamin C dan MVM terhadap fungsi ginjal berdasarkan urea dan kreatinin serum darah; serta (5) menganalisis perbedaan status gizi, kesehatan, dan fungsi ginjal wanita pekerja antar perlakuan plasebo, suplemen vitamin C dan MVM.
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Judul: Efek Suplementasi Selenium dan Vitamin E Terhadap Status Antioksidan Unggas : Kajian Non Eksperimental
Abstrak: Selenium dan vitamin E merupakan antioksidan yang dapat meningkatkan sistem imun. Penelitian ini bertujuan mengetahui pengaruh dari level pemberian selenium dan vitamin E pada status antioksidan unggas dengan metode analisis regresi dari data penelitian sebelumnya. Data yang digunakan sebanyak 95 titik yang berasal dari 23 studi yang melaporkan suplementasi selenium terhadap status antioksidan unggas serta sebanyak 57 titik data dari 16 studi yang melaporkan suplementasi vitamin E terhadap status antioksidan. Peubah yang digunakan meliputi aktivitas glutation peroksidase (GSH-Px) dan kadar malondialdehid (MDA). Data dianalisis menggunakan analisis regresi linier dan kuadratik dengan perangkat lunak IBM SPSS versi 26. Hasil analisis menujukkan bahwa suplementasi selenium tidak berpengaruh signifikan (P>0,1) pada aktivitas GSHPx, namun cenderung signifikan (0,1�����P>0,05) terhadap penurunan kadar MDA. Suplementasi vitamin E juga tidak berpengaruh signifikan (P>0,1) pada aktivitas GSH-Px, namun cenderung signifikan (0,1�����P>0,05) terhadap penurunan kadar MDA. Dapat disimpulkan bahwa suplementasi selenium dan vitamin E berpengaruh dalam penurunan kadar MDA., Selenium and vitamin E are antioxidants which can improve immune system status on poultry. The aim of this study was to examine the effect of selenium and vitamin E levels on the antioxidant status of poultry using a linear and quadratic regression model on secondary data obtained from Scopus indexed and international reputable journals. The data used were 95 data points from 23 journals which reported different levels of selenium on poultry antioxidant status and 57 data points from 16 journals which reported various levels of vitamin E on poultry antioxidant status. The observed parameters were glutathione peroxidase (GSH-Px) activity and malondialdehyde (MDA) level. Data were analyzed by linear and quadratic regression analysis using IBM SPSS software version 26. The results showed that selenium supplementation had no significant effect (P>0.1) on GSHPx activity, but slightly decrease on MDA (0.1 ����� P>0.05). Vitamin E supplementation had no significant effect (P>0.1) on GSH-Px activity, but slightly significant on MDA (0.1�����P>0.05). It can be concluded that selenium and vitamin E supplementation decreasing MDA level on poultry.
Keyword: antioxidant status, poultry, regression analysis, selenium, vitamin E

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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