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: Sintesis dan Pencirian Membran Komposit Polistirena Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: This study focused on synthesis and characterization of sulfonated polystyrene (SPS)-zeolit composite membrane as a proton exchange membrane for direct methanol fuel cell (DMFC). Sulfonation of polistyrene was done by using SO3 gas from oleum at 60 oC. The composite membrane was then synthesized with zeolite composition variation of 3%, 5%, and 7%. The success of the sulfonation process was indicated by the highest degree of sulfonation of PSS membrane with 15% concentration of polystyrene, that was 99.93%. The PSS Fourier transform infrared spectra of the composite membranes showed sulfonate group (-SO3) at 910.44 cm-1 and O-Si-O at 1091 cm-1. Topography study by using atomatic force microscope showed that the sulfonate groups of PSS were covered by the zeolite. The highest water uptake, proton conductivity, and potential difference were showed by the composite membrane with 5% of zeolite, that were 10.17%, 2.0339 10-6 S/cm, dan 15 mV respectively, showing that the PSS membrane can be applied in DMFC system.
Keyword: zeolite, sulfonation, polystyrene, DMFC, composite