Judul: Biodegradasi dispersan tumpahan minyak dengan metode DOC Die-Away dan metode botol tertutup
Abstrak: Oil spill dispersant (OSD) is a mixture of surfactant and solvent designed to break the oil layer into small granules to facilitate its dispersion in natural water. In general, OSD is toxic and naturally non-degradable because it contained aromatic compounds. There are 4 criteria of OSD which should be fulfilled, low toxic toward mammals and water environment, biodegradable, and bioaccumulation. Biodegradability is an important requirement for OSD. Analysis of OSD biodegradation was carried out using DOC die-away and closed bottle method as a reference. The selection of this method was based on the aim for covering the lack of closed bottle method that had high failure factor because of zero dissolved oxygen (DO). Meanwhile, DO in DOC die-away method can be kept by aeration during incubation time. In this work, the degradation percentages of OSD using DOC die-away method were 82.10, 72.00, and 81.38% for 10, 20, and 30 ppm, respectively, over a 28-day period, whereas using closed bottle method were 83.13 and 80.52% for 1 and 2 ppm, respectively. This comparison showed that OSD is easier decomposed by DOC die-away method.
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Judul: Perbandingan Prosedur Operasional Standar Biodegradasi Bahan Metode DOC die-away dengan Metode Botol Tertutup
Abstrak: Tests for biodegradation of chemicals by the Organization for Economic Cooperation and Development (OECD) are divided into two types, which are ready and inherent biodegradations. Dissolved organic carbon (DOC) die-away and the closed bottle are the method in ready biodegradation test. Results from material decomposition by microorganisms in waters can be seen in the concentration of dissolved organic carbon (DOC method of die-away) and dissolved oxygen consumption (closed bottle method) by microorganisms. Analysis on number of colony is performed to determine the existence of microorganisme. In this research, microorganisms analysis was conducted by cup count method. Number of colonies grown on the agar media counted with naked eye and the result was 2.13 × 104 colonies/mL for DOC mud and 2.3 × 106 colonies/mL for the covered bottle mud. Degradation percentage of DOC die-away methods which measures the ratio between DOC concentrations at the appointed time with the initial concentration of DOC obtained better results than the closed bottle method is the ratio between BOD value divided by ThOD (theoretical oxygen demand) or COD. Sodium benzoate as a control showeed ThOD about 1.66 mg O2/mg materials meanwhile the test materials had COD value of 1.83 mg O2/mg materials.
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Judul: Warna bulu kucing ras persia: variasi pola warna dan pewarisannya
Abstrak: Kucing Persia mempakan kucing rasyang paling urnum dijumpai di Indonesia. Kucing Persia memiliki bulu yang panjang dengan variasi wama bulu yang sangat beragam. Perkawinan yang lebih terarah sangat perlu dilakukan untuk meningkatkan kualitas genetik warna dan pola wama bulu kucing. Penelitian ini bertujuan untuk rnempelajari variasi warna dan pola wama bulu kucing Persia yang terdapat di Indonesia, yang dilakukan di kantor pusat Cat Fancy Indonesia mulai bulan Oktober 2000 sampai Januari 2001. Data yang digunakan rnempakan data pedigree kucing Persia yang tercatat di Cat Fancy Indonesia dari tahun 1997 sampai Oktober 2001 yang terdiri dari 187 jantan dan 258 betina, selain itu juga dilakukan pengamatan langsung kepada tiga penyayang dan breeder kucing yang ada di Bandung.
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