Judul: The relationship among three populations of climbing perch fish (Anabas testudineus) based on analysis of Random Amplified Polymorphic DNA (RAPD) and morphometric characters.
Abstrak: Penelitian ini bertujuan untuk mengevaluasi hubungan 3 populasi ikan betok (Anabas testudineus) yang berasal dari Jawa, Sumatera, dan Kalimantan dengan metode RAPD (Random Amplified Polymorphic DNA) dan karakter morfometrik. Hasil penelitian menunjukkan bahwa tingkat heterozigositas populasi ikan betok berkisar antara 0,088-0,109, sedangkan polimorfisme genetik populasi ikan betok Kalimantan merupakan yang tertinggi (25,93%) dibandingkan dengan populasi dari Sumatera (22,22%) dan Jawa (18,52%). Hubungan kekerabatan ketiga populasi menunjukkan jarak genetik antara populasi ikan betok Jawa dan Sumatera (0,279) lebih dekat dibandingkan dengan Kalimantan terhadap Jawa (0,398) dan Sumatera (0,551). Berdasarkan analisis dendrogram UPGMA mengelompokkan populasi Jawa dan Sumatera terpisah dari populasi Kalimantan. Dalam hal ini, 3 karakter morfometrik menunjukkan perbedaan populasi dan 18 karakter kemiripan, serta terdapat indeks kemiripan antara Sumatera dan Jawa sebesar 10%
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Judul: Karakterisik Fenotip Morfometrik dan Genotip RAPD (Random Amplified Polymorphic DNA) Ikan Betok Anabas testudineus (Bloch, 1792)
Abstrak: The identification of phenotype and genotype is needed for mapping the population structure geographically of a fish species in the waters territory. The purpose of this research was to analyze the genetic variability based on the morphometric phenotype characteristics and RAPD genotypes of climbing perch fish population of Kalimantan, Java and Sumatera. Characterization of phenotypes were conducted using a method of morphometric truss and typing of genotype by using three primers of RAPD (OPA-07, OPA-02, and OPC 05). The polymorphism level and heterozygosity of climbing perch fish population of Kalimantan was higher than the population of Java and Sumatera, wich reached 39,29% and 0,16. The genetic distance between climbing perch fish population of Kalimantan, Java and Sumatera ranged from 0,17 to 0,39. The population of Kalimantan showed the similarity of morphometric truss with Sumatera population about 49,97%, while with the population of Java was 24,96%.
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition