Judul: Studi Sebaran Suhu PErmukann Laut Dari Citra Satelit NOAA  12 dan In Sit Di Samudera  Hindia Bagian Barat Sumatera (84' BT - 98' BT) Tahun 1998-2000
Abstrak: Suhu permukaan laut (SPL) adalah parameter fisika suatu perairan yang mudah diamati dan merupakan salah satu indikator suatu kondisi perairan. Gejala terjadinya Dipole Mode Everit (DME) di Samudera Hindia dan El Niiio So?rfherri OsciNa~iori (ENSO) di Samudera Pasifik dapat diketahui dengan mengamati penyimpangan SPL yang terjadi. Dengan adanya interaksi timbal balik antara atmosfer dan lautan, maka terjadi telekoneksi antara Samudera Pasifik dengan Samudera Hindia, dimana gejala ENS0 yang tejadi di Pasifik pada tahun 1997 - 1998 dapat mempengaruhi kondisi perairan di Samudera Hindia tropis bagian tenggara yang ditandai dengan terjadinya peningkatan SPL pada bulan Januari - Juni 1998
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Judul: Variabilitas arus, suhu dan angin di Perairan Barat Sumatera dan inter-relasinya dengan Indian Ocean Dipole Mode (IODM) dan El Nino Southern Oscillation (ENSO)
Abstrak: Di Samudera Hindia terbentuk sistem osilasi yang dikenal dengan Indian Ocean Dipole Mode (IODM). IODM merupakan fenomena yang disebabkan karena terbentuknya dua kutub anomali SPL (suhu permukaan laut) di perairan timur Samudera Hindia dan perairan barat Samudera Hindia (Saji et al., 1999). Di Samudera Pasifik juga terbentuk sistem osilasi yang dikenal dengan El Nino Southern Oscillation (ENSO). Adanya kedua fenomena ini mempengaruhi fluktuasi arus, suhu air laut dan angin di perairan barat Sumatera. Penelitian ini bertujuan untuk menganalisis variabilitas arus dan suhu di perairan barat Sumatera pada kedalaman 5, 25, 55, 75, 125, 155, 175, 250, 446, dan 617 meter pada periode Januari 1979 hingga Desember 2007. Menganalisis variabilitas angin permukaan di perairan barat Sumatera pada periode Januari 1979 hingga Desember 2007. Serta mengkaji hubungan antara variabilitas arus, suhu dan angin permukaan di perairan barat Sumatera dengan IODM dan ENSO. Data yang digunakan dalam penelitian ini merupakan data bulanan ratarata dengan jangka waktu antara Januari 1979 hingga Desember 2007. Data arus dan suhu diperoleh dari GFDL-NOAA (http://www.gfdl.noaa.gov). Data angin dari ESRL-NOAA (http://www.esrl.noaa.gov). Data Dipole Mode Index (DMI) diperoleh dari JAMSTEC (www.jamstec.go.jp) dan data Southern Oscillation Index (SOI) dari BOM (http://www.bom.gov.au). Stasiun data arus dan angin terletak pada koordinat 5°LS dan 100°BT, sedangkan data suhu terletak pada koordinat 5,26°LS dan 100,5°BT.
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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