Judul: Dinamika Populasi Parasitoid Telur Penggerek Batang Padi Kuning Scirpophaga incertulas (Walker) (Lepidoptera: Pyralidae) pada Pertanaman Padi di Kabupaten Klaten
Abstrak: Yellow Rice Stem Borers (Scirpophaga incertulas) is an important pest of rice in Indonesia. Currently, most farmers depend on use of insecticides to control the pest and mostly by propalactic and indiscriminate ways. The practices can disrupt the environment and the activities of natural enemies. This study is to observe the dynamic off egg parasitoid of Yellow Rice stem Borers in three subdistrict (Juwiring, Cawas, and Trucuk) in Klaten, Central Java. Egg clusters were collected and reared to note parasitization every other weeks. This study during Februari-October 2012. The most dominant of egg parasitoid at Juwiring, Cawas, and Trucuk was Tetrastichus schoenobii with percentage 67%, 96%, and 43%. Egg parasitoids were found at Juwiring T. schoenobii, Telenomus rowani, Trichogramma japonicum and Telenomus sp., a hyperparasitoid also discovered at Juwiring is Trichomalopsis sp., at Cawas T. schoenobii and T. rowani were found, and at Trucuk T. schoenobii, T. rowani, and T. japonicum were found. Parasite of egg clusters at rice crops on 0-4 weeks after transplanting was T. schoenobii, and parasite of egg clusters at rice crops on 6 and 8 weeks after transplanting was T. rowani.
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Judul: Perkembangan Parasitoid Telur Penggerek Batang Padi Kuning Scirpophaga incertulas Walker (Lepidoptera: Pyralidae) pada Pertanaman Padi Organik dan Konvensional di Ngawi, Jawa Timur
Abstrak: Penggerek batang padi kuning (PBPK) Scirpophaga incertulas (Walker) (Lepidoptera: Pyralidae) merupakan hama utama tanaman padi. Parasitoid telur sangat berpotensi dalam mengendalikan populasi PBPK. Kepadatan populasi parasitoid antara lahan dengan sistem budidaya organik berbeda dengan sistem konvensional. Penelitian ini bertujuan untuk membandingkan kelimpahan populasi parasitoid telur PBPK. Penelitian ini menggunakan dua metode dalam mengumpulkan kelompok telur PBPK. Metode pertama yaitu metode U dan metode kedua yaitu dengan membagi petak pengamatan menjadi 5 plot. Jumlah kelompok telur yang diperoleh antara lahan organik dan konvensional tidak berbeda nyata. Jumlah parasitoid telur PBPK pada lahan organik lebih banyak, dibandingkan lahan konvensional tetapi persentase parasitisasinya tidak berbeda nyata. Parasitoid yang ditemukan pada pengamatan, yaitu Trichogramma japonicum, Telenomus rowanii dan Tetrastichus schoenobii. Parasitoid T. rowani merupakan parasitoid yang dominan ditemukan pada minggu ke-8 dan 10 MST. T. schoenobii merupakan parasitoid yang dominan ditemukan dominan pada minggu ke-12 MST. Tingkat parasitisasi tertinggi seluruh parasitoid pada minggu ke-8 dan ke-10 MST masing-masing 70,74% dan 64,02% pada lahan sistem organik serta 66,48% dan 53,8% pada lahan sistem konvensional.
Keyword: Scirpophaga incertulas, parasitoid telur, padi organik, lahan sistem konvensional, lahan sistem organik

Judul: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
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