Judul: Siklus hidup dan statistik demografi penggerek padi kuning (Scirpophaga incertulas) Walker (Lepidoptera: Pyralidae)
Abstrak: Penelitian bertujuan untuk mengetahui siklus hidup dan statistik demografi penggerek padi kuning Scirpophaga incertulas di rumah kaca. Penelitian dilaksanakan di rumah kaca, Jurusan. Hama dan. Penyakit Tumbuhan, Fakultas Pertanian, Institut Pertanian Bogor dan dimulai pada awal bulan Agustus sampai akhir Oktober 1989. Penelitian dilakukan dengan mengamati 20 kelompok telur yang masing-masing diletakkan dalam tabung plastik. Pengamatan stadium larva hingga imago dilakukan dengan menginfestasi 4 larva yang baru menetas ke tanaman padi yang berumur 3 minggu setelah tanam. Tanaman padi yang digunakan sebanyak 20 pot dan pengamatan dilakukan setiap hari hingga semua imago mati. Hasil pengamatan menunjukkan rata-rata lama stadium telur, larva, prapupa dan pupa, imago jantan dan betina masing-masing 7.00 hari, 22.19 hari, 13.98 hari, 5.74 ha- ri dan 5.50 hari. Laju reproduksi bersih (Ro) 24.9064, lama generasi (T) 44.2553 hari, laju pertumbuhan intrinsik (r) 0.0726, potensi berbiak (入) 1.0753, rata-rata laju kelahiran (B) 0.0946, laju kelahiran sesaat (b) 0.0913 dan kematian sesaat (d) adalah 0.0186.
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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: 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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