Judul: Keberadaan Antibodi Antiprotease Escherichia Coli Enteropatogenik Pada Neonatus dan Balita Penderita Diare
Abstrak: Pengambilan serum dilakukan pada 5 orang balita penderita diare dan 30 orang neonatus. Sebagai antigen digunakan protease EPEC K.l.l yang merupakan protein ekstraselular. Antigen diperoleh dengan menumbuhkan bakteri pada media minimaI M, dan isolasi protein dilakukan dengan amonium sulfat 45%. Keberadaan antibodi antiprotease EPFlC pada serum penderita diare dan neonatus dilihat dengan uji Dot Blot. Sebagai kontrol positif, digunakan serum meneit Balb/c yang telah diimunisasi dengan antigen protease EPEC. Produksi serum tersebut dilakukan dengan imunisasi protease EPEC ditambah adjuvant dilakukan sebanyak lima kali, dengan dosis 25 ~g'"per ekor, rute subkutan, interval 8-10 hari. Dari penelitian ini diperoleh hasil pada 40% serum balita penderita diare dan 13,3% serum neonatus terdapat antibodi antiprotease EPEC. Semua serum neonatus dari ibu yang sehat, pada uji Dot Blot menunjukkan hasil negatif. Pada serum neonatus dari ibu yang tidak pernah menderita diare namun pernah menderita penyakit lain, didapatkan tiga sampel positif. Hal ini menunjukkan adanya kemungkinan antigen protease EPEC K. 1.1 dapat bereaksi silang dengan antigen penyebab penyakit lain.
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Judul: Deteksi Keberadaan Antibodi Anti-Escherichia coli di Dalam Serum Sapi Neonatus yang Diberi Kolostrum dengan Metode Enzyme-Linked Immunosorbent Assay (ELISA)
Abstrak: The aim of this research is to study the present of antibody against E. coli in the sera of neonates calf which given colostrum and challenged by enterotoxigenic Escherichia coli (ETEC) K99. Eleven neonates calves were clinically healthy kept since birth until the age of one week.This neonates calves are divided into two groups, first group is colostrums group (8 calves) and the other is non-colostrum group (3 calves). Colostrum group were given colostrum on age 0-72 hours with 12 hours interval, whereas non-colostrum group are given cow milk at the same time. Each group were challenge by ETEC K99 5X1010 CFU emulsion it in alhydrogel peroral at the 12 hours of age. Blood sample were taken from jugularis vein on age 0th, 12th, 24th, 48th, 72th, and 168th hours. The present of antibody in the sera detecting by indirect ELISA (Enzyme-Linked Immunosorbent Assay Method). The result showed of the highest concentration of antibody in the sera at 24 hours of age for colostrums group, whereas no antibody against E. coli were detected for non-colostrums group . Based on the results, we concluded the concentration of antibody in colostrum can detection at 24 hours until one week after given colostrum. The highest concentration of antibody anti- E. coli in 24 hours after given colostrum.
Keyword: colostrum, neonates calf, antibody anti-E. coli, sapi neonatus, Kolostrum,

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