Judul: Radiographic  evaluation  of  biphasic  calcium  phosphate  (bcp)  bone  graft  in  sheep
Abstrak: Penelitian ini dilakukan untuk membandingkan tandur tulang bifasik kalsium fosfat (BKF) secara in vivo. Tandur tulang BKF adalah kombinasi hidroksiapatit (HAp) dan β-trikalsium fosfat (β-TKF). Delapan belas ekor domba dibagi menjadi dua grup. Grup pertama menerima BKF1 (kombinasi HAp 70%:β-TKF 30%)dan grup kedua menerima BKF2 (HAp 60%:β-TKF 40%). Kedua tandur tulang dibuat dalam bentuk pelet dan ditanamkandengan operasi aseptis pada bagian 1/3 proximo medial tulang tibia kanan. Sebagai kontrol pada medial tulang tibia kiri dilubangi tanpa pemberian tandur tulang. Pemeriksaan radiografi tulang tibia domba dilakukan pada hari ke-0 praoperasi, pascaoperasi, hari ke-7, 30, 60, dan 90 pascaoperasi. Parameter yang diamati adalah luas lesio, rasio densitas radiografi, radiopasitas, marginasi, bentuk tandur, dan bentuk kerusakan tulang. Hasil penelitian menunjukkan tandur tulang BKF2 mempunyai biodegradasi yang lebih baik dibandingkan tandur tulang BKF1. Hal ini terlihat dari penurunan rasio densitas radiografi dan luas BKF2 yang lebih besar daripada BKF1 hingga hari ke-90 pascaoperasi. Akan tetapi, persembuhan tulang terjadi lebih cepat pada kontrol daripada BKF1 dan BKF2., The study was conducted to evaluate in vivo bone graft biphasic calcium phosphat (BCP). Bone graft BCP is combination of hydroxyapatite (HAp) and β-tricalcium phospate (β-TCPl. Eighteen domestic sheeps were divided into two groups. Each group recieved different combination of BCP. The first group received BCP1 (HAp 70%:β-TCP 30%) and the second received BCP2 (HAp 60%:β-TCP 40%). Both of the bone grafts were shaped into a pellet form and were implanted under aseptic surgery on the 1/3 proximomedial of right tibia bone. The left tibia bone was drilled without bone graft as control. Bone graft were subjected to radiographic examination before and after surgery. Continously radiographic evaluation also performed at 7 th , 30 th , 60 th , and 90 th day postoperative. The observation parameters were lesion area width, radiographic density ratio, radiopacity, margination, the shape of bone graft, and control under radiographic evaluation. The result shown that BCP2 had better biodegradability properties than BCP1. This was evident from the decreased in the radiographic density ratio a nd area of BCP2 greater than BCP1 until ninetieth days postoperative. However, bone healing occurred more rapidly in controls than BCP1 and BCP2.
Keyword: BKF, densitas radiografi, evaluasi radiografi, tandur tulang

Judul: Dinamika leukosit pada persembuhan tulang dengan implantasi kombinasi bifasik kalsium fosfat
Abstrak: This study was conducted to evaluate the leucocyte dynamics in rabbits which were implanted by biphasic calcium phosphate (BCP) bone graft in the tibia bones. The bone graft was made by combination of 70% hydroxyapatite (HA) : 30% β-tricalcium phosphate (β-TCP), herein after reffered as BCP 1, and 60% HA : 40% β-TCP (BCP 2). Twelve rabbits were used in this experiment and divided into two groups. The first group was implanted with BCP 1 and the second group was implanted with BCP 2. Blood samples were collected from auricularis veins and sampled at pre-surgery (H0) and 7, 30 and 60 days post-surgery. According to the Complete Blood Count (CBC) test, the differential leucocyte dynamics in both treatment groups were in the normal range. Differential leucocyte profile showed that the implant was not rejected by the body and did not cause any excessive inflammatory reaction.
Keyword: β-tricalcium phosphate, hydroxyapatite, differential leucocyte, bone graft, Bogor Agricultural University (IPB)

Judul: Model Input-output dalam Masalah Network Flow
Abstrak: Production process is a process, which is done by industry, to transform input into output. According to the type of output and its activity, industry can be classified into various sectors, which are connected to each other. Therefore, a model to analyze the connection among sections is needed. The model is known as input-output model (IO model). IO model presents an IO table, which shows informations about the transaction between goods and services in each economic sector. Furthermore, the IO model also shows that the amount of all input is the same as the amount of all output. In this paper, the transaction of each economic sector in IO table is analyzed using network flow theory. The formulated network flow problem implies that each sector represents partly as a producer and also as a consumer. This paper also solves a minimum cost circulation problem.
Keyword: