Judul: Pengaruh Plant Growth Promoting Rhizobacteria terhadap Biologi dan Statistik Demografi Aphis glycines Matsumura (Hemiptera: Aphididae) pada Tanaman Kedelai
Abstrak: On various plants, Plant Growth Promoting Rhizobacteria (PGPR) application known can suppress the development of plant pest population. This research aimed at PGPR effects against biology and statistic demographic of Aphis glycines Matsumura (Hemiptera: Aphididae) on soybean plant. This research conducted in the Department of Plant Protection, Faculty of Agriculture, Bogor Agricultural University. PGPR application, which consists of Bacillus polymyxa and Pseudomonas fluorescens can extend second instar nymphs stadia and life cycle of A. glycines. PGPR application also can effect to statistic demographic of Aphis glycines. The gross reproduction rate, net reproduction rate, and intrinsic growth rate of A. glicines on PGPR application plant is lower than non PGPR application plant. Moreover, PGPR application plant can extend long generation and doubling time of A. glycines. The use of PGPR can inhibits the development of A. glycines population on soybean plant.
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Judul: Dampak Aplikasi Pgpr Pada Kacang Panjang Terhadap Biologi Dan Statistik Demografi Aphis Craccivora Koch (Hemiptera: Aphididae).
Abstrak: Plant growth promoting rhizobacteria (PGPR) merupakan bakteri yang hidup dan berkembang disekitar perakaran tanaman yang dapat meningkatkan pertumbuhan tanaman dan sebagai agen antagonis. Penelitian ini bertujuan mengetahui pengaruh PGPR pada kacang panjang terhadap biologi dan statistik demografi A. craccivora Koch. Penelitian ini dilakukan di Laboratorium WiSH, Dramaga, Bogor dimulai dari bulan Oktober 2014 sampai Januari 2015. Penggunaan PGPR terdiri dari Rhizobium, Bacillus polymyxa, dan Pseudomonas fluorescens. Penggunaan PGPR berpengaruh terhadap biologi A. craccivora yaitu dapat memperpanjang stadia nimfa instar 2, siklus hidup, dan menurunkan keperidian. Penggunaan PGPR juga berpengaruh terhadap statistik demografi A. craccivora. Tanaman yang diaplikasikan PGPR mempunyai laju reproduksi kotor (GRR), laju reproduksi bersih (Ro), dan laju pertambahan intrinsik (r) A. craccivora yang lebih rendah daripada kontrol. PGPR dapat menghambat waktu berlipat ganda (DT) A. craccivora menjadi lebih lama daripada kontrol. PGPR dapat meningkatkan pertumbuhan tanaman, seperti adanya peningkatan panjang dan jumlah akar, jumlah bintil akar, tinggi tanaman, jumlah daun, panjang dan kerapatan trikoma.
Keyword: Aphis craccivora, biologi, kacang panjang, plant growth promoting rhizobacteria, statistik demografi

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4