Judul: Fenomena dan Angkutan Massa  Air di Perairan Barat sumatera pada Bulan Juli 1990 dan Maret 1991
Abstrak: Perairan di barat Sumatera merupakan perairan yang dipengaruhi oleh dua macam arus, yaitu Arus Katulistiwa Utara dan Arus Katulistiwa Selatan. Asus katulistiwa utara adalah arus yang muncul pada bulan Desember - Mei dan bergerak ke arah barat. Arus katulistiwa selatan mesupakan arus dengan edaran tetap di Samudera Hindia. Arus ini menyebas dasi basatdaya Australia dan terjadi sepanjang tahun bergerak ke asah barat mendekati Madagaskar (Wyrtki, 1961). Tujuan dari penelitian ini adalah untuk mengetahui karakteristik massa ais laut dengan membandingkan sebaran suhu, salinitas, oksigen terlarut serta zat hara dan juga menghitung kejelukan dinamik dan volume angkutan di perairan barat Sumatera.
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Judul: Studi Karakteristik Massa Air Asal Samudera Pasifik di Perairan Timur Indonesia Pada Bulan November - Desember 1996.
Abstrak: Secara geografis perairan Indonesia berbatasan langsung dengan dua samudera besar dunia yaitu Samudera Pasifik dan Samudera. Adanya pergerakan massa air tersebut menyebabkan terciptanya kondisi oseanografi yang khas pada tiap wilayah laut di perairan Indonesia, khususnya di perairan timur. Penelitian mengenai karakteristik massa air ini dilakukan di wilayah perairan timur Indonesia yang tercakup dalam wilayah survei ARLINDO 96. Data ARLINDO 96 diperoleh dari pelayaran ARLINDO CIRCULATION 96 di perairan kawasan timur Indonesia yang meliputi perairan Selat Makassar bagian selatan, Laut Flores, Selat Kambing (antara Alor dan Wetar), Laut Banda, Laut Manui (Banda Utara), Selat Sanana, Laut Seram, dan Selat Lifomatola. Analisis data dilakukan terhadap sebaran menegak dan melintang suhu dan salinitas, diagram T-S (suhu-salinitas), diagram T-0 (suhu-oksigen) dan percampuran massa air menggunakan metode perhitungan Mamayev.
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Judul: Synthesis of Chicken Eggshells-Based β-Tricalcium Phosphate Bioceramics and Their Biocompatibility Test as A Tooth Filler
Abstrak: Preservation of alveolar bone following tooth extraction is an important step in dental practices before dental implant placement. This study reported synthesis of β-Tricalcium Phosphate (β-TCP) bioceramics and its biocompatibility test as a tooth filler to maintain the desired alveolar ridge dimension and stimulate the bone healing processes in the area of tooth loss. β-TCP bioceramics was resulted directly from precipitation of calcinated chicken eggshells as calcium source and phosphoric acid. The corresponding β-TCP was mixed with chitosan 2% to get β-TCP pellet for biocompatibility testing. Biocompatibility testing of β-TCP on lower incisor was performed in rabbits and sheep as animal model. In this study, the x-ray diffraction (XRD) profiles showed that 1000 oC calcinated chicken eggshells correspond to calcium oxide (CaO). There was also transformation phase of CaO into Ca(OH)2 observed after more than three months stored. The XRD profiles proved that obtained β-TCP bioceramics by precipitation has the same pattern with that of reference data base and commercial β-TCP. Fourier transform infrared (FTIR) spectra were completely consistent with the result of crystallization processes observed by XRD measurements. Moreover, the purity of the product shown by the atomic absorption spectroscopy (AAS) resulted in Ca/P ratio of 1.48 which was closed to that of standard β-TCP ceramics. The repeatable XRD peaks patterns and FTIR spectra obviously showed the sample reproducibility. Sheep’s alveolar socket that is filled with the corresponding β-TCP demonstrated the expected results. The x-ray radiograph of sheep’s jaw indicated no change on mesio-distal of the edentulous area. Moreover, the histological results were completely consistent with the x-ray radiograph and macroscopic result which is proved by the formation of new bone. In the contrary with sheep’s result, histological results showed no tooth growth on rabbit proved by the presence of lipid and collagen on the extraction site. This result did not correspond to the x-ray radiograph and macroscopic results that demonstrated the tooth growth and erupted tooth. It is clear that the corresponding β-TCP could minimize the bone loss and maintain the dimension of alveolar ridge.
Keyword: β-tricalcium phosphate, chicken eggshells, rabbit, sheep, tooth filler