Judul: Analisis Parameter Genetik dan Deteksi Segregan Transgresif pada Dua Populasi F2 Persilangan Kacang Tanah (Arachis hypogaea L.)
Abstrak: This study was aimed to estimate genetic parameters in two groundnut segregating populations and to detect trasgressive segregate candidates of the best cross. The segregating populations were developed from cross between GWS 18 A1 with GWS 79 A1 and GWS 18 A1 with Zebra. The field experiment was conducted from December 2013 - March 2014 at the Cikarawang experimental-field, Bogor, West Java (± 250 meters above sea level). The genetic parameters estimated were variance components and broad sense heritability. Besides, the gene action were estimated using skewness and kurtosis analysis of F2 distribution. The results showed that there were different of genetic variability and heritability among the segregating populations. Based on the total-pods, GWS 18 A1 x GWS 79 A1 was a potential segregating population to obtain high yielding cultivars. Estimation of gene action for plant height, total number of pods, and seed weight per plant in segregating population showed different results among the two populations. There were characters controlled by many genes or few genes with additive gene action, dominance, and epistasis effects (duplicates or complementary). In population of GWS 18 A1 x GWS 79 A1 cross, from all F2 plants harvested, there were seven plants expected to be trangressive segregates which had total pod number more than the range of the best parent.
Keyword: transgressive segregates, skewness, kurtosis, gene action, genetic parameters

Judul: Analisis Parameter Genetik Dan Deteksi Segregan Transgresif Pada Populasi F2 Kacang Tanah (Arachis Hypogaea L.).
Abstrak: Penelitian ini bertujuan untuk menduga paramaneter genetik, menduga pengendalian genetik karakter-karakter yang dipelajari dan mendeteksi individu terduga segregan transgresif pada populasi F2 dalam upaya memperbaiki potensi genetik pada turunan kacang tanah. Penelitian ini dilaksanakan di Kebun Percobaan IPB Leuwikopo, Dramaga, Kabupaten Bogor Jawa Barat, mulai bulan November 2014 hingga Februari 2015. Bahan genetik tanaman yang digunakan adalah dua populasi zuriat Zebra x GWS 18 A1 dan resiprokalnya (GWS 18 A1 x Zebra) yang terdiri dari populasi P1, P2, dan F2. Parameter genetik yang diduga yaitu komponen ragam, heritabilitas arti luas dan pendugaan aksi gen menggunakan analisis keruncingan dan kemenjuluran kurva sebaran F2. Karakter - karakter pada dua populasi F2 persilangan kacang tanah sebagian besar memiliki nilai duga heritabilitas dan koefisien keragaman genetik yang tergolong rendah. Terdapat 2 individu terduga segregan transgresif berdasarkan karakter jumlah polong pada populasi persilangan Zebra x GWS 18 A1 dan 1 individu pada populasi persilangan GWS 18 A1 x Zebra.
Keyword: heritabilitas, keragaman genetik, aksi gen, keruncingan, kemenjuluran

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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