Judul: Analisis sebaran suhu permukaan laut dan kandungan klorofil-a dengan menggunakan data modis di perairan Nusa Tenggara Timur
Abstrak: Penelitian ini dilakukan pada bulan April 2005 sampai bulan Oktober 2005 di Lembaga Penerbangan dan Antariksa Nasional (LAPAN), PEkayon, Jakarta Timur dengan menggunakan citra Terra-MODIS di wilayah perairan sekitar Nusa TEnggara Timur (NTT) pada musim timur dan peralihan II Tahun 2004.
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Judul: Sebaran konsentrasi klorofil-a dan suhu permukaan laut menggunakan citra satelit terra MODIS di perairan natuna
Abstrak: Penelitian tentang Sebaran Konsentrasi Klorofil-a dan Suhu permukaan Laut Menggunakan Citra Satelit Terra MODIS Di Perairan Natuna, dilaksanakan dari bulan Maret 2005 hingga Desember 2005. Yang mana secara umum penelitian ini terdiri dari tiga tahap, yaitu (1) pengumpulan data; (2) pengolahan data; (3) analisis dan interpretasi data. Data lapangan didapatkan dari PPPTMGB LEMIGAS. Data citra satelit Terra MODIS di peroleh dari NASA Goddard Space Flight Center, sedangkan untuk data citra TOPEX-POSEIDON diperoleh dari ccar.colorado.edu. Data citra satelit yang digunakan terdiri dari 14 tanggal perekaman citra. Proses pengolahan data citra satelit menggunakan perangkat lunak SeaDAS version 4.7 yang berbasiskan Linux. Untuk menduga sebaran konsentrasi klorofila menggunakan algoritma OC 4 Version 4, sedangkan untuk menduga sebaran suhu permukaan laut menggunakan algoritma Pathfinder. Terlihat sebaran konsentrasi klorofil-a dari citra satelit Terra MODIS pada musim barat berkisar antara 0,11 mg/m3 – 2,59 mg/m3 dan cenderung lebih rendah dibandingkan musim timur yang berkisar antara 0,10 mg/m3 – 3,68 mg/m3 dengan nilai yang semakin meningkat menuju perairan pantai hingga pesisir. Sebaran suhu permukaan laut dari citra satelit Terra MODIS pada musim barat berkisar antara 24 °C – 29°C dan cenderung lebih rendah dibandingkan musim timur yang berkisar antara 28 °C – 32 °C. Selain itu terlihat nilai suhu yang cenderung meningkat menuju perairan pantai hingga pesisir dan perairan yang semakin mendekati katulistiwa. Berdasarkan persamaan yang didapat antara data lapangan dengan data dari citra konsentrasi klorofil-a dan suhu permukaan laut diperoleh nilai koefisien determinasi (R2 ) masing-masing sebesar 0,2974 dan 0,25. Selain itu, didapatkan hubungan yang negatif antara kelimpahan konsentrasi klorofil-a dan suhu permukaan laut.
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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