Judul: Keanekaragaman Fungi Ektomikoriza di Hutan Penelitian Meranti Gunung Dahu Leuwiliang, Kabupaten Bogor
Abstrak: Shorea merupakan salah satu marga suku Dipterocarpaceae yang mampu berasosiasi dengan fungi ektomikoriza. Tujuan penelitian ini adalah mengidentifikasi dan menduga keanekaragaman fungi ektomikoriza di Hutan Penelitian Meranti Gunung Dahu. Pengambilan fungi ektomikoriza dilakukan dengan metode eksplorasi pada tegakan Shorea leprosula dan Shorea selanica dengan jarak tanam 2 m x 2 m, 3 m x 3 m dan 4 m x 4 m. Hasil penelitian menunjukkan bahwa telah ditemukan 9 jenis dari 5 suku fungi ektomikoriza yaitu Amanita sp. (Amanitaceae), Boletus sp1, Boletus sp2, Boletus sp3 (Boletaceae), Laccaria sp. (Hydnangiaceae), Russula sp1, Russula sp2, Russula sp3 (Russulaceae), dan Scleroderma sp. (Sclerodermataceae). Semakin lebar jarak tanam maka jumlah individu fungi ektomikoriza yang ditemukan semakin banyak. Jenis fungi ektomikoriza yang hanya ditemukan pada tegakan S. leprosula adalah Scleroderma sp., sedangkan jenis fungi ektomikoriza yang hanya ditemukan pada tegakan S. selanica adalah Amanita sp., Laccaria sp. and Boletus sp2. Indeks keanekaragaman jenis fungi ektomikoriza tergolong sedang, sedangkan indeks kekayaan dan indeks kemerataan jenis fungi ektomikoriza tergolong rendah. Berdasarkan indeks kesamaan komunitas fungi ektomikoriza menunjukkan bahwa terdapat tiga kelompok besar habitat fungi ektomikoriza.
Keyword: ektomikoriza, keanekaragaman, Shorea leprosula, Shorea selanica

Judul: Ektomikoriza pada Shorea spp. di Kawasan Hutan Haurbentes Jasinga Bogor
Abstrak: Shorea spp. are member of Dipterocarpaceae family. They are tropical rainforest plant which have high economic value due to high quality of their timber and non-timber products. Ectomycorrhizal fungi had been used as biofertilizer for Shorea spp. This research aimed to study the ectomycorrhizal root morphotypes, isolation and identification of ectomycorrhizal fungi associated with Shorea spp. Sixty ectomycorrhyzal root tip samples were taken from Shorea saminis (plot 1), Shorea palembanica (plot 2), and Shorea stenoptera (plot 3). The results showed that all plants associated with ectomycorrhiza, with percentage of roots colonization around 60%. The highest abundance of associated root was found at plot 2, followed by plot 3, and the lowest was found at plot 1. Data of root morphotype analysis indicated that there were 5 major of root tip morphotypes. There were brown irregular pinnate, black irregular pinnate, silver irregular pinnate, brown monopodial pinnate, and black monopodial pinnate. Brown irregular pinnate was the dominant root tips morphotypes with the frequency was 60.9%. A total of 15 different isolates were isolated from 3 ectomycorrhizal root tips morphotypes, e.g. brown irregular pinnate, black irregular pinnate, and brown monopodial pinnate. All of the isolates were mycelia sterilia. Some of the fungi had special mycelial characteristics by producing hyphal anastomosis and produce intensive branching mycelium.
Keyword: mycelia sterilia, Shorea., intensive branching mycelium, ectomycorrhyzal root tip morphotype, Anastomosis

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