Judul: Keanekaragaman dan Kelimpahan Spesies Staphylinid (Coleoptera) di Habitat Persawahan Sekitar Bogor
Abstrak: Staphylinid beetles (order Coleoptera) are characterized by elongated and slender body shape, short elytra that covered some segments of the abdomen, and body usually shiny black, brown, or yellow-brown. In the paddy field ecosystem, these beetles are known as predator. This research aimed to measure the diversity and abundance of staphylinid beetles in the paddy field at some areas in Bogor. The research also studied the hemolymph structure of Paederus fuscipes. Collections of beetle were done by using road sampling method in some paddy fields. Observations of hemolymph structure were done by making a blood smear. Staphylinid beetles found in six paddy fields in Bogor were Paederus fuscipes (subfamily Paederinae), Stenus sp. (subfamily Steninae), Hypostenus arachnoides (subfamily Steninae), and Astenus lombokianus (subfamily Paederinae). Diversity of staphylinid species in paddy fields is low. The most dominant species staphylinid at the paddy fields was P. fuscipes. Hemocytes type found in the hemolymph of P. fuscipes beetles were prohemocyte, plasmatocyte, adipohemocyte, and cystocyte.
Keyword: Bogor Agricultural University (IPB), staphylinid., paddy fields, hemocyte, diversity, Dominance

Judul: Komunitas Staphylinidae (Coleoptera) di Persawahan Sekitar Bogor dan Struktur Histologi Paederus fuscipes Curt.
Abstrak: The insect is an important component in the rice field ecosystem. One of the groups of insects in rice field ecosystems is family Staphylinidae. Staphylinids are charactarized by short elytra, so it does not cover the all abdominal segments. This research aimed to study community of staphylinids in some rice field in Bogor. Histological structures of Paederus fuscipes were studied. Collections of the beetles were done by road sampling method. The weathers, i.e temperature, humidity, and light intensity were measured during collections of staphylinids. Histological structure of P. fuscipes were observed based on paraffin method. Staphylinids collected in the three locations of rice field were Paederus fuscipes, Cryptobium abdominale, and Stenus sp. Staphylinids dominant in rice fields was P. fuscipes. An histological structure of P. fuscipes identified were the stomach, Malpighian tubule, rectum and anus.
Keyword: Staphylinid, diversity, Paederus fuscipes, histological structure

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