Judul: Genetic diversity of microsatellite and cytochrome oxidase subunit I (COI) gene in Indonesian Buffalo
Abstrak: This study aims to determine genetic diversity in Indonesian buffaloes using microsatellite markers and cytochrome oxidase subunit I gene. The sample used in this study were 211 samples of buffaloes (30 samples of swamp buffaloes from Aceh, North Sumatra, Banten, Central Java, West Nusa Tenggara, South Sulawesi, and 19 samples from Riau) and 12 samples of river buffaloes from North Sumatra. Microsatellite markers used were CSSM66, ILSTS61, and ILSTS17 loci. Microsatellite data in term of observed number of alleles (na); effective number of alleles (ne); Observed heterozygosity (Ho); Expected heterozygosity (He); and polymorphism information content (PIC) were analyzed by GenAlEx 6.41 and Cervus 3.1. COI gene sequences were analyzed using MEGA 5.1 software with the Neighbor-joining method and kimura 2 parameter substitution models. This study showed that CSSM66 loci had two alleles and two genotypes. ILSTS61 loci had five alleles and 14 genotypes. ILSTS17 loci had two alleles and three genotypes. Microsatellite genetic distance between populations could separate Indonesian swamp buffalo. The reconstructed phylogeny tree based on COI gene sequences were able to distinguish Subspecies of swamp buffalo and river buffalo. COI gene sequences showed four haplotypes for Indonesian swamp buffalo, namely H1, H2, H3 and H4.
Keyword: genetic diversity, microsatellite, COI, Indonesian buffalo

Judul: Karakteristik Fenotipik Kerbau Rawa (Swamp Buffalo) Di Kabupaten Bogor
Abstrak: The objectives of the present study were to estimate variation of phenotypic characteristic, population structure and rearing management system of swamp buffalo from four sub-districts of Cibungbulang, Pamijahan, Nanggung and Sukajaya in Bogor district, West Java. A total of 238 swamp buffalo (101 males and 137 females) were used in this study buffalo were consisted of 54 heads swamp buffaloes from Cibungbulang (27 males and 27 females), 40 heads swamp buffaloes from Pamijahan (23 males and 17 females), 79 heads swamp buffaloes from Nanggung (29 males and 50 females) and 65 heads swamp buffaloes from Sukajaya (22 males and 43 females). Body dimension studied were wither height, hip height, hip width, body length, chest circumference, chest depth and chest width. Data obtained were analyzed by t test analysis with minitab package program version 14.0, while qualitative data were analyzed by descriptive analysis. The result showed that the body measurement of buffaloes which have age from 0-1 years almost the some in all districts observed. However, at the age 1 to 3 years in male observed in Pamijahan higher than Cibungbulang, Nanggung and Sukajaya (P<0,05). At the age up to 3 years in female observed in Cibungbulang higher than in Pamijahan, Sukajaya and Nanggung (P<0,05). The coat color of buffalo in Bogor district dominantly by dark gray (70,8%) followed light gray (27,4%) and albino (1,8%). Feet coat color dominantly by white color (76,2%) followed by gray color (13,7%) and black color (10,1%). The whorls almost found in head (86,3%), hip (79,2%), chest (72,1%) and under stomach (44,6%). Keywords : swamp buffaloes, quantitative characteristic, qualitative characteristic
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Judul: Nanokristalin Pirit (FeS2) sebagai Material Semikonduktor Fotovoltaik.
Abstrak: Teknologi fotovoltaik adalah suatu proses yang dapat mengubah sinar matahari menjadi energi listrik dengan media semikonduktor. Penggunaan sel surya untuk fotovoltaik hanya dapat mengonversi radiasi matahari menjadi energi listrik kurang dari 20%. Efisiensi akan meningkat ketika material semikonduktor untuk fotovoltaik dibuat menjadi ukuran nano. Pirit merupakan salah satu material semikonduktor fotovoltaik yang memiliki energi pita celah (Eg) dalam kisaran 0.8–0.95 eV. Energi pita celah tersebut terbukti meningkat ketika disintesis dengan metode hidrotermal menggunakan beragam molar [S]:[Fe] pada suhu 200 °C dalam 24 jam. Nilai energi pita celah yang dihasilkan adalah 1.58–2.073 eV. Ukuran nanokristalin pirit yang dihasilkan berada pada kisaran 21.04–58.77 nm menurut data Particle Size Analyzer. Besarnya ukuran nanokristal pirit yang tumbuh kurang dari 50 nm merupakan poin penting untuk aplikasi fotovoltaik.
Keyword: Hidrotermal, fotovoltaik, nanokristal, pirit