Judul: Perubahan ukuran antropometri kaitannya dengan status serum vitamin A pada anak pra-sekolah
Abstrak: Masalah kurang energi protein ( KEP) yang ditandai dengan hambatan pada perubahan ukuran antropometri masih merupakan masalah gizi utama di Indonesia. Demikian juga masalah defisiensi Vitamin A masih merupakan masalah gizi utama yang lain. Kedua masalah gizi tersebut merupakan dua masalah yang terpisah-pisah, tetapi mungkin juga merupa- kan suatu kejadian yang saling berkaitan satu dengan yang lainnya. Apabila jelas ada keterkaitan antara kedua masalah gizi tersebut maka penanganan pada satu masalah gizi akan mempunyai dampak ganda sehingga akan menguntungkan dalam program penanganan masalah gizi. Tujuan penelitian ialah untuk mempelajari keterkaitan antara perubahan ukuran antropometri dengan status serum vitamin A pada anak pra-sekolah. Faktor kebiasaan makan sayur/buah yang merupakan sumber pro-vitamin A juga akan dianalisa dalam hubungannya dengan keadaan re- rophthalmia dan perubahan ukuran antropometrinya. Penelitian merupakan pengolahan data dari "Proyek Penanggulangan Kebutaan", Study I di Purwakarta, Jawa Barat. Dari lebih kurang 5000 anak yang diperiksa sebanyak 7 kali ( sehingga jumlah keseluruhan formulir lebih. kurang 35.000 buah ), dipilih sebanyak 1270 anak yang diambil dari anak dengan zerophthalmia, match controle dan secara acak sebanyak 5%. Anak dengan zerophthalmia berjumlah 446 anak ( 35,5% ), anak yang diambil sebagai match controle berjumlah 337 anak ( 26,5%) dan sisanya 487 anak (38,4%) dari yang diambil secara acak.
Keyword: Retinol, Child feeding, Antropometric

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: Bifurkasi Hopf pada siklus bisnis IS-LM tanpa dan dengan waktu tunda
Abstrak: One of business cycle models in dynamical economics is the IS-LM business cycle model with time delay, where the time delay lies in stock capital variables. It is a time delay between the existence of stock capital and the time to get ready to invest. In a model without time delay, changing the parameter of investment rate on income could affect the system stability. On the other hand, in a model with time delay, there exists critical time delay changing the system stability. This shows limit cycle, which can be concluded that Hopf bifurcation occurs
Keyword: Bogor Agricultural University (IPB), time delay, Hopf bifurcation, business cycle model