Judul: Populasi Nematoda Parasit Pada Kumbang Elaedobius kamerunicus Faust.
Abstrak: Parasitism is a close interaction between two organisms that are detrimental to either party. Weevil Elaedobius kamerunicus is a pollinator of oil palm (Elaeis guineensis Jacq.). One of the parasite of the weevil is nematode. The aims of the research was to study population of parasitic nematode in E. kamerunicus at Cikidang, Sukabumi, and Cimulang, Bogor plantations of PTPN VIII. The research was conducted in June 2010-January 2011. Weevils were collected from male flower of oil palms. Samples of nematode were identified and counted. Parasitic nematode species found in the E. kamerunicus was Elaeonchus partenonema. Populations of E. partenonema were highest in wet season, that were in October (Cikidang, Sukabumi) and November (Cimulang, Bogor). Rainfall has a highest impact on nematode parasite population among parameters measured.
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Judul: Populasi kumbang Elaeidobius kamerunicus Faust pada tanaman kelapa sawit Elaeis guneensis Jacq di PTPN VIII Cimulang, Bogor
Abstrak: Elaeidobius kamerunicus (Coleoptera : Curculionidae) is a weevil pollinator of oil palm which used in Indonesia since 1983. The aim of the research were to study the population of weevil and the environmental factors that affected the population of weevil. Weevil populations were observed in male flower of oil palm by stratified random sampling in July, October, and November. Relationship between environmental factors and weevil population were analyzed by Pearson’s correlation using SigmaPlot software version 11.0. Results showed that population of the weevil in November was higher than that in July and October. The population of weevil was affected by number of spikelet per bunch and rain fall.
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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