Judul: Keanekaragaman Parasitoid di Hutan dan Lahan Pertanian di Desa Naena Muktipura, Kabupaten Mimika, Papua
Abstrak: Parasitoids are potential and effective to regulate insect pest. The objective of this research is to analize the diversity of parasitoids in forest and agricultural land of Naena Muktipura village, Mimika Regency, Papua. Insects were collected with malaise trap and yellow-pan trap which were set in Forest Health Monitoring cluster. Diversity is analyzed with Margalef Richness Indicies (R2), Shannon- Wiener Diversity Indicies (H’) and Pielou Eveness Indicies (E1). The result shows that value of R2, H’ and E1 in forest are higher (11.36, 3.53 and 0.79) than agricultural land (8.93, 2.81 and 0.62). Parasitoids in forest are dominated by Tachinids (Diptera) and Scelionids (Hymenoptera) while agricultural land are dominated by Phorids (Diptera) and Diapriids (Hymenoptera). Forest around agricultural land is potential to be conservation patch of parasitoid.
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Judul: Keanekaragaman dan Parasitisasi Parasitoid pada Pertanaman Sayuran di Bogor
Abstrak: In an agricultural area, agroecosystem could influence diversity and parasitism of parasitoids as natural enemies of insect pests. A survey to learn diversity and rate of parasitism of insect pests by parasitoids had been conducted in several agricultural fields with different criteria, such as farming practice (organic and convensional), species richness of vegetable crops (5-8 sp. and 9-15 sp.) and different crop ages (3, 4 and 5 months), in Bogor from August to October 2012. By making a 50 steps line transect for every field, eggs, larvae and pupa of insect pests were collected monthly, reared in laboratory and incidence of parasitism were calculated. The results showed that there were no significant differences on diversity and rate of parasitism based on three criterias used. However, based on the diversity of vegetable plant species around, the rate of parasitism in field with less plant species diversity (5-8 sp.) was higher than the field with more vegetable plant species diversity (9-15 sp.). These results might be caused by the limited number of samplings conducted and other potential factors such as surrounding habitat, seasonal fluctuation, and complex interactions between species in agroecosystem.
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Judul: Analisis Sifat Kristal Dan Sifat Optik Pada Keramik SrTiO3 Didadah RuO2
Abstrak: Sintesis keramik Stronsium Titanat (SrTiO3) didadah Rutenium Oksida (RuO2) metode reaksi padatan (solid state) telah berhasil dilakukan. Keramik di annealing dengan suhu 850C. Karakterisasi keramik Stronsium Titanat (SrTiO3) didadah Rutenium Oksida (RuO2) dengan variasi konsentrasi pendadah (0%; 0,5%; 1%) dilakukan untuk mengetahui pengaruh konsentrasi pendadah Rutenium Oksida (RuO2) terhadap sifat kristal dan sifat optik pada keramik Stronsium Titanat (SrTiO3). Struktur kristal keramik berbentuk kubus dengan ukuran parameter kisi a=b=c berturut-turut senilai 3,905 Å; 3,905 Å; dan 3,903 Å. Sifat optik keramik ditunjukkan dengan optik longitudinal dan transversal yang berada pada bilangan gelombang 261-937 cm-1 dan nilai energi celah pita sebesar 3,48 eV-3,56 eV., The synthesis of Strontium Titanate (SrTiO3) ceramic doped with Ruthenium Oxide (RuO2) using the solid-state reaction method has been successfully conducted. The ceramics were annealed at a temperature of 850°C. Characterization of Strontium Titanate (SrTiO3) ceramic doped with Ruthenium Oxide (RuO2) with varying dopant concentrations (0%; 0.5%; 1%) was performed to understand the influence of Ruthenium Oxide (RuO2) dopant concentration on the crystal properties and optical properties of Strontium Titanate (SrTiO3) ceramics. The ceramic's crystal structure is cubic with lattice parameter sizes of a=b=c, respectively, measuring 3.905 Å; 3.905 Å; and 3.903 Å. The optical properties of the ceramic are indicated by longitudinal and transverse optics in the wavenumber range of 261-937 cm-1 and a bandgap energy value ranging from 3.48 eV to 3.56 eV.
Keyword: ceramic, crystal properties, optical properties