Judul: Karakteristik Morfologi dan Anatomi Beberapa Spesies dan Kultivar Begonia Serta Analisis Hubungan Kekerabatannya
Abstrak: The distinctive asymmetric leaf, fleshy jointed stem, and showy flower are several common characters belongs to genus Begonia. Indonesia has more than 200 species Begonia which spread in Java, Sumatera, Kalimantan, Sulawesi, and Papua islands. Morphological and anatomical characters can be used to identify, classify, and determine plants relationship. The aims of this research were to identify morphological and anatomical characters of 11 species and cultivars of Begonia and to determine their relationship. Nine species and cultivars were successfully identified, while two species could not be identified. Seven species were identified as B. acetosa, B. bowerae. B. listada, B. thelmae, B. semperflorens, B. maculata, and B. lepida, while two cultivars could be identified as B. Argenteo-Gutata “Fanfare” and B. “Orpha C. Fox”. Study on morphological characters of 11 species and cultivars obtained six similar characters including simple leaf, alternate leaf arrangement, asymmetric leaf blade base, axillary’s inflorescence, and unisexual flower. Based on paradermal section, there were individual stomata, stomatal cluster, and both individual and stomatal cluster in leaves of Begonia. Begonia listada had the smallest stomatal size (35.0 x 22.9 μm) while B. maculata had the biggest (46.7 x 30.4 μm). Begonia “Orpha C. Fox” had the lowest stomatal density (23.2/mm2), while Begonia sp. 1 had the highest (108.7/mm2). Observation on transversal section showed that B. lepida had the smallest leaf thickness (162.5 μm) while B. listada had the highest (433.3 μm). The results of hierarchical cluster analysis based on morphological, anatomical, or both characters showed different patterns of relationship.
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Judul: Bali and Lombok species of begonia (Begoniaceae)
Abstrak: A taxonomic study of the genus Begonia Blume (Begoniaceae) in Bali and Lombok Islands were conducted based on morphological characters. Three previously known species ( Begonia coriaceae Hassk., B. longifolia Blume and B. tenuifolia Dryander ) five new species ( B. baliensis Girmansyah sp. nov., B. lempuyangensis Girmansyah sp. nov., B. lombokensis Girmansyah sp. nov., B .multibractea Girmansyah sp. nov, B. pseudomuricata Girmansyah sp. nov.,) are proposed. A key to species is included. A phylogenetic analysis was undertaken using PAUP vers. 4. Ob4. Programs Swofford (2000) with Hillebrandia sandwicencis as out group. This analysis be resulted a parsimonious cladogram, which shows that the Begonia divided into three subclade and belong to four section (Sphenanthera, Reichenheimia, Petermannia and Parvibegonia).
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Judul: Pemanasan Sekunder Reaksi Fusi Plasma dengan Menggunakan Radio Frequency
Abstrak: Plasma merupakan bentuk ke-empat dari materi setelah padat, cair dan gas yang terbentuk dari proses ionisasi gas. Plasma dapat digunakan dalam reaksi fusi, yaitu reaksi penggabungan dua inti atom ringan menjadi inti atom yang lebih berat sambil melepaskan energi. Untuk mendapatkan energi dari reaksi fusi, inti yang akan direaksikan harus dipanaskan pada temperatur yang sangat ekstrem tingginya. Salah satu cara agar dapat mencapai kondisi ini adalah memberikan pemanasan tambahan atau pemanasan sekunder kepada plasma dalam reaksi fusi tersebut. Nilai daya serap rata-rata ion Deuterium yang sesuai dengan selang nilai daya dari data ITER adalah daya yang menggunakan frekuensi 50 MHz sampai dengan 60 MHz. Dengan menggunakan frekuensi 60 Hz diperoleh nilai daya rata-rata yang diserap sebesar 1,235.10-12 W.
Keyword: gelombang radio, pemanasan sekunder, plasma, reaksi fusi