Judul: Potensi Partikel Fe Valensi Nol sebagai Pendegradasi Pestisida Organoklorin dan Surfaktan Alkilbenzenasulfonat
Abstrak: Remediation technology using zero valence Fe particles (Fe0) as an effective environmentally friendly pollutant degradation agent has been concerned by researchers in the last decade. In this research, Fe0 particles have been synthesized by using FeSO4·6H2O and Na2S2O3. The Fe0 particles were then tested for their ability in degrading hexachlorobenzene (HCB), hexachloroethane (HCE), and dodecylbenzenesulfonate (DBS) including their degradation performance and their respective kinetics. The degradation performance assay showed that the Fe0 particles were not able to degrade HCB and HCE optimally. However, DBS was successfully degraded by Fe0 even though it had just reached about 50% from the initial concentration. The best DBS degradation was conducted at pH 4 with optimum time of 40 minutes. DBS degradation reaction followed partial first order with an observed rate constant (k) of 4.0×10-3 min-1 and 8.74×10-3 min-1 for graphic method and substitution method, respectively.
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Judul: Potensi Partikel Fe Valensi Nol sebagai Pendegradasi Pestisida Organoklorin dan Surfaktan Alkilbenzenasulfonat
Abstrak: Remediation technology using zero valence Fe particles (Fe0) as an effective environmentally friendly pollutant degradation agent has been concerned by researchers in the last decade. In this research, Fe0 particles have been synthesized by using FeSO4·6H2O and Na2S2O3. The Fe0 particles were then tested for their ability in degrading hexachlorobenzene (HCB), hexachloroethane (HCE), and dodecylbenzenesulfonate (DBS) including their degradation performance and their respective kinetics. The degradation performance assay showed that the Fe0 particles were not able to degrade HCB and HCE optimally. However, DBS was successfully degraded by Fe0 even though it had just reached about 50% from the initial concentration. The best DBS degradation was conducted at pH 4 with optimum time of 40 minutes. DBS degradation reaction followed partial first order with an observed rate constant (k) of 4.0×10-3 min-1 and 8.74×10-3 min-1 for graphic method and substitution method, respectively.
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Judul: Taksonomi dan variasi morfologi secara geografi pada trachypitkecus auratus (E. Geoffroy, 1812) dan trachypithecus cristatus (Raffles, 1821 (Primates=Cercopithecidae=Colobinae)
Abstrak: Penelitian yang bertujuan untuk mengungkapkan status taksonomi Trachypithecus auratus dan Trachypithecus cristatus dilakukan atas dasar spesimen yang disimpan di dalam koleksi Museum Zoologicum Bogoriense Balitbang Zoologi, LIPI (MZB); Pusat Pengkajian Sumberdaya Alam Sumatra. Jurusan Biologi, Fakultas MIPA, Universitas Andalas (PBC SD dan PBC PT) dan Zoological Reference Collection, National University of Singapore (ZRC). Untuk mengetahui status taksonomi kedua jenis tersebut, materi yang digunakan untuk analisis se-banyak 80 buah spesimen dan dilakukan pengukuran berdasarkan pada 28 variabel tengkorak dan dua variabel tubuh. Menggunakan analisis regresi berganda dapat menerangkan bahwa tujuh macam variabel tengkorak dan dua variabel tubuh tidak dipengaruhi oleh jenis kelamin. Variabel tersebut yaitu panjang dan lebar foramen magnum (FML dan FMW), jarak antara molar 3 (M3-M3), lebar mesopterigoid fosa (MFW), lebar terdekat interorbital (PIW), lebar post orbital (POW), panjang tulang hidung (TH), panjang badan dan panjang ekor. Analisis diskriminan dapat menerangkan bahwa pada populasi Trachypithecus auratus di Jawa dijumpai bentuk variasi klinal yang mengakibatkan di Pulau tersebut hanya dijumpai satu anak jenis yaitu T. auratus auratus. Sebaliknya pada populasi T. cristatus dijumpai ada lima macam bentuk yaitu Thailand, P. Natuna, Bintang, Sumatra-Kalimantan dan Malaya yang merupakan bentuk intermediar antara P. Sumatra-Kalimantan dan Bintang…dst
Keyword: Trachypithecus cristatus, Morphology, Cercopithecidae, Colobinas