Judul: Penggandaan Kromosom Jati (Tectona grandis L.) dengan Oryzalin dalam Kultur In Vitro dan Pendugaan Tingkat Ploidi
Abstrak: Teak (Tectona grandis L.) is one of the forestry plants that have a high economic value and an important role in carbon absorbing. Chromosome doubling in teak was intended to produce a better plant both morphologically and it’s wood quality. Antimicrotubule, such as oryzalin treatment is one of the chromosome doubling inducing method. This research was conducted to get the most effective concentration and treatment period to induce the chromosome doubling of teak through in vitro culture. It’s effectivity was measured by the changes of chloroplast number in the stomatal guard cell and stomatal density, also supported by the lowest lethal effect that was measured by it’s survival percentation. The most effective oryzalin treatment to induce chromosome doubling of teak from diploids into tetraploids was estimated at 5 μM concentration with 3 days treatment period. The survival at this treatment reached 70% of the treated plants. In which about 60% of the treated plants had a doubled chloroplast number in their guard cells from average 6,0-11,9 into 12,0-23,9 chloroplast per stoma along with the decreased of stomatal density.
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Judul: Chromosome Doubling of White Albizia (Albizia falcataria L. Fosberg) Seeds through Oryzalin Treatment and Identification of Tetraploid Plants
Abstrak: Sengon (Albizia falcataria L. Fosberg) adalah salah satu tanaman kehutanan yang memiliki nilai ekonomi tinggi. Penggandaan kromosom sengon diharapkan akan menghasilkan tanaman sengon yang lebih baik secara morfologi atau kualitas kayunya. Penelitian ini bertujuan untuk mengetahui konsentrasi oryzalin dan periode perlakuan yang efektif dalam menggandakan kromosom sengon melalui perlakuan benih. Selain itu penelitian ini bertujuan mengamati pengaruh perendaman benih sengon dalam oryzalin terhadap pertumbuhan kecambah dan perubahan secara sitologi dan anatomi yang ditimbulkannya, serta untuk identifikasi tanaman sengon tetraploid. Konsentrasi oryzalin 5 μM dengan periode perendaman 6 jam merupakan perlakuan paling efektif dalam menginduksi penggandaan kromosom benih sengon yang menghasilkan 60% tanaman sengon tetraploid dengan tingkat kematian paling rendah dari perlakuan lain yaitu 50%. Pendugaan perubahan tingkat ploidi dari diploid menjadi tetraploid menyebabkan jumlah kloroplas pada sel penjaga stoma semakin tinggi dari rataan 6,5 kloropas per stoma menjadi 12,9 kloroplas per stoma, kerapatan stomata semakin rendah dari rataan 610,0 stomata per mm2 menjadi 342,1 stomata per mm2, dan ditandai dengan penghambatan pertumbuhan tinggi kecambah dari rataan 77,1 cm menjadi 60,6 cm. Peningkatan jumlah kloroplas menjadi sekitar dua kali lipat dapat dijadikan alat penduga efektif dalam peningkatan tingkat ploidi dari diploid menjadi tetraploid pada sengon.
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Judul: Sistem Navigasi pada Robot Pemadam Api Menggunakan Wall Following dan Logika Fuzzy
Abstrak: A robot needs a good navigation to complete its task. One way to provide navigation capabilities on robots is artificial intelligence. Navigation capabilities using artificial intelligence may be associated with the ability to accept input from a range of sensors. However, inputs from the environment are uncertain so that a simple modeling is not sufficiently representative. Fuzzy logic is expected to overcome these uncertainties. This research aims to develop the navigation system on a fire-fighter robot using wall following algorithms and fuzzy logic. The system is simulated on KRPAI 2013 environment where the robot is expected to move by following the wall, extinguishing the fire, and returning to home. It is shown that the robot has successfully completed the mission on KRPAI 2013 with a success rate of 87.5%.
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