Judul: Studi morfologiperbandingan induksi persembuhan kerusakan tulang oleh bahan implan tulang hidrosiapatit dan beta-trikalsiumfosfat
Abstrak: This study was conducted with aim to investigate the effectiveness implant material of Hidroxyapatite (HA):Beta-tricalcium phosphate (β-TCP) bone implant made from eggshell with ratio of HA:β-TCP 70:30 and 60:40 in inducing bone remodelling process at macroscopic and microscopic levels. Five milimeters thick implant was inserted aseptically in sheep tibia bone using surgical prosedures. Data were collected at days 30, 60 and 90 after implanted. There were no significant difference between HA:β-TCP with ratio 70:30 and 60:40 in bone remodelling process at macroscopic and microscopic observation. Remodelling process in control group was faster than HA:β-TCP implanted bone. There was no sign of rejection against HA:β-TCP implant. HA:β-TCP showed osteoinductive and osteoconductive characteristics although remodelling process was slower than the controls.
Keyword: remodelling., hidroxyapatite, bone implant, Beta-tricalcium phosphate, Beta-tricalcium phosphate, Bogor Agricultural University (IPB)

Judul: Kajian Morfologi Penggunaan Bahan Biomaterial Hidroksiapatit: β-Trikalsium Fosfat pada Kerusakan Segmental Tulang Kelinci
Abstrak: This study was conducted to examine the healing process of rabbit’s bone implanted with mixture of hydroxyapatite-tricalcium phosphate (HA:β-TCP) with mixture ratio of 70:30 and 60:40. Six New Zealand white rabbits were used in this study. Hydroxyapatite β-tricalcium phospate implanted in the medial part of the right tibia using surgical procedures, while the same part of the left tibia served as controls without implants. The samples of tibia were taken on 30 days after implantation. Parameters observed were the shape, the degradation rate of the implant, the implant bonds with the bone, new bone growth into the implant, and the signs of inflammatory reaction around the implant. The results of this study showed that the healing process in control samples was faster than bone treated with implant. There was no macroscopically morphological difference observed between the bones implanted with mixture of 70:30 and those with 60:40. But, there was difference observed microscopically. Osteocytes was observed in the bones implanted with mixture of 60:40 and there was no osteocytes observed in the bones implanted with mixture of 70:30. At day 30, the implant of HA:β-TCP showed potency of biodegradability, bioresorbability, osteoconductivity, and good biocompatibility for body. It is suggested that the next research of this mixture as bone implant is still needed to find the optimal composition
Keyword: Bogor Agricultural University (IPB), rabbit bone, hydroxyapatite, healing process, bone implants, beta-tricalcium phosphate

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf