Judul: Heterosis dan Daya Gabung pada Persilangan HalfDiallel Cabai Besar dan Cabai Keriting (Capsicum annuum L.)
Abstrak: The aim of this research was to study estimation the heterosis and heterobeltiosis of fifteen hybrids, the general combining ability (GCA), and the specific combining ability (SCA) of six chili inbred lines of hybridization between big and curly pepper (Capsicum annuum L.). This research was conducted at Genetic and Plant Breeding Laboratory and IPB Experimental Field, Leuwikopo, Dramaga, Bogor, from September 2012 to March 2013. The experimental design used was randomized complete block design (RCBD) single factor with three replication. Plant materials were six chili inbred lines, fifteen hybrids from hybridization half diallel crosses, and two commercial hybrids. Genotype IPB C159 x IPB C120, IPB C159 x IPB C111, IPB C159 x IPB C5, IPB C120 x IPB C5, IPB C111 x IPBC2, IPB C19 x IPB C5, and IPB C5 x IPB C2 had positive heterosis, heterobeltiosis, and SCA values for some variables observed. All these genotypes had advantages that were better than the comparison of varieties TM 999 and Gada on some characters observed
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Judul: Pendugaan Daya Gabung dan Nilai Heterosis Hasil Persilangan Half Diallel Cabai Rawit (Capsicum annuum L.).
Abstrak: The aim of this research was to study estimation general combining ability (GCA) and specific combining ability (SCA) of six bird pepper inbred lines (Capsicum annuum L.), heterosis and heterobeltiosis of fifteen bird pepper hybrids in half diallel crosses. The experiment were conducted from November 2013 to April 2014 using a randomized complete block design (RCBD) with three replications at Leuwikopo University Farm, IPB. Analysis of GCA and SCA were based on the Griffing’s model of diallel design method II. Heterosis values were predicted based on the average values of their parents and heterobeltiosis were predicted based on the average values of the highest parents. Genotype IPB C10 x IPB C174, IPB C160 x IPB C291, IPB C174 x IPB C291, dan IPB C291 x IPB C293 had positive SCA, heterosis, and heterobeltiosis values for some variable observed. Genotype IPB C10 x IPB C174 dan IPB C160 x IPB C291 had higher yield for each plant than the commercial varieties which were Sonar and Nirmala
Keyword: heterosis, half diallel, combining ability, bird pepper

Judul: Pemurnian Trinatrium Fosfat Hasil Samping Pengolahan Monasit dengan Metode Rekristalisasi dan Adsorpsi.
Abstrak: Proses pengolahan monasit menjadi rare earth element (REE) dengan metode basa menghasilkan produk samping berupa garam trinatrium fosfat (Na3PO4). Garam tersebut masih mengandung pengotor yang bersifat radioaktif, yaitu 125.25 ppm uranium (U) dan 702 ppm torium (Th). Tujuan penelitian ini adalah memurnikan Na3PO4 dengan metode rekristalisasi dan adsorpsi. Kondisi optimum rekristalisasi yang didapatkan ialah konsentrasi awal larutan Na3PO4 77.34 g/100 mL dengan waktu pengadukan 30 menit. Rasio adsorben optimum yang didapatkan adalah 10% dengan campuran adsorben karbon aktif dan bentonit (7:3). Rendemen Na3PO4 hasil rekristalisasi mencapai 90% dengan kemurnian fosfat 97%. Kadar uranium pada kristal menurun dari 125.25 hingga 54.41 ppm dan kadar Th tidak terdeteksi. Analisa termogravimetrik (TGA) kristal hasil rekristalisasi membuktikan terdapat 12 molekul H2O pada kisi kristal. Spektra fourier transform infrared (FTIR) Na3PO4 menunjukkan vibrasi ulur PO43- pada bilangan gelombang 993 cm-1, vibrasi asimetri dan simetri H2O pada bilangan gelombang 3585 cm-1 dan 2910−3585 cm-1, dan vibrasi tekuk H2O pada bilangan gelombang 1651 cm-1. Titik leleh kristal yang didapatkan memiliki rentang yang sempit sesuai dengan standar, yaitu 73−78.3 °C.
Keyword: adsorpsi, monasit, rekristalisasi, trinatrium fosfat