Judul: Studi karakteristik dan aliran massa air pada musim barat dan musim timur di perairan selat Lombok
Abstrak: Penelitian ini dilaksanakan pada bulan Januari 2004 dan Juni 2005 yang terdiri dari 9 stasiun. Lokasi pengamatan dibagi menjadi dua transek, yaitu pada aliran masuk dan aliran keluar Selat Lombok.
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Judul: Variabilitas massa air pada lapisan termoklin perairan Selat Lombok dan Ombai periode Januari 2004 - Juni 2005
Abstrak: Tujuan dari penelitian ini adalah untuk mengidentifikasi variabilitas massa air di lapisan termoklin Selat Lombok dan Ombai dengan menganalisis perubahan suhu dan salinitas yang diperoleh dari data hasil rekaman sensor Temperature, Salinity, Pressure (TSP) pada Vector Majoring Current Meter (VMCM) yang terpasang pada mooring buoy di Selat Lombok dan Ombai periode Januari 2004- Juni 2005. Data yang digunakan adalah data suhu dan tekanan dari program INSTANT (International Nusantara Stratification and Transport). Penelitian ini dilakukan pada kedalaman termoklin dan data berada pada kedalaman 200 m, 300 m, 400 m, dan 500 m di Selat Lombok dan kedalaman 300 m dan 400 m di selat Ombai. Pengolahan data menggunakan bahasa pemrograman Matlab ver 7.0.1 dentifikasi massa air dilakukan dengan menggunakan metode diagram TS dari data mooring dan data CTD (Conductivity, Temperature, Depth). Untuk mengetahui periode variabilitas suhu dan salinitas dilakukan analisis deret wakktu dengan mencari spektrum densitas energi dengan merubah data dari ranah waktu ke ranah frekeunsi menggunakan metode Fourier transform (FFT). Hubungan antara Selat Ombai dan Lombok baik itu suhu maupun salinitas dicari dengan korelasi selang dan uji koherensi.
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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