Judul: Asupan Vitamin A, Status Vitamin A, dan Status Gizi Anak SD di Kecamatan Leuwiliang, Kabupaten Bogor
Abstrak: Growth in human life is influenced by various factors, one of them is nutrient intake. Nutrient intake still a problem that affects the quality of human resources. The objective of this research was to study the intake of vitamin A, vitamin A status, and nutritional status of primary school children in Leuwiliang Sub-District, Bogor Regency. There were 31 children grade 2 and 3 in SD Angsana I and II Cibeber Village selected by purposive sampling technique. The results showed that more than half of the children had medium sufficient levels of vitamin A (54.8 %) with mean value levels of vitamin A 112.3%. Generally, they had normal nutritional status (93.5%). More than half of children had low vitamin A status (58.1%) with mean value retinol serum is 10.7 μg/dl . The result also found that relationship between the level of adequacy of energy and protein with nutritional status of the children were not significant (p>0.05). The relationship between intake of vitamin A to vitamin A status also showed no significant relationship (p>0.05). It was presumably due to the presence of other factors (reserves of vitamin A in the liver). There was no significant relationship between vitamin A status and nutritional status (p>0.05). It was presumably due to the presence of other factors (food consumption, socio-economic and disease factors) affected nutritinal status.
Keyword: school-age children vitamin A consumption, energy and protein consumption

Judul: Hubungan status antropometri dan vitamin A dengan status imun siswa sekolah usia 7-9 tahun di Cibeber, Leuwiliang kabupaten Bogor
Abstrak: Defisiensi vitamin A merupakan penyebab kebutaan yang paling sering dijumpai pada anak-anak dan membuat 250.000-500.000 orang anak meninggal dunia. Lebih kurang 150 juta anak lain mengalami kematian dalam usia anakanak akibat penyakit infeksi yang antara lain akibat status vitamin A yang tidak memadai (Ahmed dan Darnton 2008). Defisiensi Vitamin A berhubungan dengan penurunan imunitas dan peningkatan infeksi. Defisiensi zat gizi mikro juga dapat menyebabkan kehilangan berat badan, kegagalan tumbuh kembang pada anak dan penyebab penurunan cadangan zat gizi yang berpengaruh terhadap penurunan imunitas (Tomkins dan Watson 1993). Tujuan umum penelitian ini adalah untuk mengetahui hubungan antara status antropometri dan status vitamin A dengan status imun siswa sekolah dasar (usia 7-9 tahun) di Cibeber, Leuwiliang Kabupaten Bogor. Tujuan khusus penelitian ini menganalisis: (1) hubungan status antropometri dengan status vitamin A anak; (2) hubungan status vitamin A dengan status imun anak; (3) hubungan status imun dengan morbiditas anak; serta (4) hubungan morbiditas dengan status gizi berdasarkan antropometri anak.
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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