Judul: Studi Keragaman Genetik dan Perlindungan Derajat Perkawinan Silang Berdasarkan Analisis Isozim Serta Pengujian Provenansi Jenis Bakau
Abstrak: Tumbuhan R. mucronata Lamk. merupakan salah satu jenis dominan pada hutan mangrove, yang menyebar pada substrat lumpur dalam. Siring dengan terjadinya kerusakan besar pada hutan mangrove Indonesia, populasi ini bertujuan untuk mengetahui keragaman genetik, derajat perkawinan silang, menguji pertumbuhan dan menduga heritabilitas prevonen R. mucronata Lamk. dari Sumatera Utara, dan menduga heritabilitas provenan Cilacap. Isozim yang dianalisis meliputi AAT, ADH, EST, MDH dan PER. Pelaksanaan pengujian provenansi dirancang untuk sekaligus pengujian keturunan.
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Judul: Keragaman Genetik Shore laevis Ridl. di Kalimantan Berdasarkan Penanda Mikrosatelit
Abstrak: Shorea laevis Ridl. is one member of commercial species from Dipterocarpaceae family. This species is also as one of the important trees in tropical rain forest, based on ecological and economic evaluation. In general, S. laevis distributes naturally in Peninsular Myanmar and Thailand, Peninsular Malaysia, Sumatera, Aceh, and Borneo Island. The objective of this study was to cross species amplify microsatellites and to estimate genetic variation within and among populations. This study used nuclear microsatellite analysis based on observed alleles and polymorphic loci. Results showed that S. laevis had moderate value of genetic variation within population (He) = 0,4443. In general, this value of genetic variation was smaller if compared to other Shorea species that also analysed by the same method. The closest genetic relationship (smallest distance) was possessed by S. laevis populations of Bukit Bangkirai and PT. ITCIKU, while the furthermost relationship (largest distance) was possessed populations of Batu Ampar and PT. Sari Bumi Kusuma.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4