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: 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: Warna bulu kucing ras Persia : variasi pola warna dan pewarisannya
Abstrak: Kucing Persia merupakan kucing ras yang paling umum dijumpai di Indonesia. Kucing Persia memiliki bulu yang panjang dengan variasi warna bulu yang sangat beragam. Perkawinan yang lebih terarah sangat perlu dilakukan untuk meningkatkan kualitas genetik warna dan pola warna bulu kucing. Penelitian ini bertujuan untuk mempelajari variasi warna dan pola warna 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 merupakan 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. Secara umum tercatat 104 penyayang dan breeder kucing ras di Indonesia, 74,04% terdapat di Jawa Barat dan sisanya (25%) terdapat di daerah Jakarta. Jumlah kucing Persia yang lahir di Indonesia adalah 387 kucing (87,16%), yang terdiri dari 163 (42,12%) jantan dan 224 (57,88%) betina. Jumlah kucing Persia yang diimpor ke Indonesia adalah sebanyak 57 (12,845%) yang terdiri dari 23 (40,35%) jantan dan 34 (59,65%) betina. Jumlah kucing Persia yang terdapat di Jawa Barat (84,14%) lebih banyak dibanding jumlah kucing Persia yang ada di Jakarta (14,86%). Secara umum warna bulu cream (9,01%) dan pola warna solid (34,01%) memiliki persentase tertinggi. Warna cream merupakan warna dilusi dari warna merah (red) yang dapat dihasilkan dari berbagai macam kombinasi warna bulu yang dimiliki tetua sebelumnya, sebagai contoh dari perkawinan tetua yang memiliki warna bulu cream dengan red smoke. Perkawinan antara tetua yang memiliki warna dan pola warna bulu yang tidak murni dapat menghasilkan turunan yang memiliki warna dan pola warna bulu yang bervariasi.
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