Judul: Biologi Reproduksi Brachymeria lasus Walker (Hymenoptera: Chalcididae) pada Ulat Penggulung Daun Pisang Erionota thrax (Lepidoptera: Hesperiidae)
Abstrak: Penelitian ini bertujuan untuk mendapatkan informasi tentang lama hidup, karakteristik reproduksi imago B. lasus termasuk jumlah keturunan dan umur pupa inang yang ideal untuk perkembangan parasitoid. Penelitian dilakukan di Laboratorium Pengendalian Hayati, Departemen Proteksi Tanaman, Fakultas Pertanian, Institut Pertanian Bogor. Parasitoid diperoleh dengan mengambil pupa Erionota thrax yang terparasit oleh B. lasus dari lapangan, kemudian dimasukkan ke dalam wadah-wadah plastik. Imago parasitoid B. lasus yang muncul diperbanyak dengan dipelihara dalam tabung yang terdapat pupa E. thrax. Untuk mengetahui lama hidup imago, imago dipelihara dan diberi perlakuan tanpa pakan, pakan air, pakan madu 10% memarasit dan tanpa memarasit inang. Untuk mengamati pengaruh umur dan ukuran pupa terhadap tingkat parasitisasi, inang prapupa, pupa umur 1, 2, 3, 4, 5, 6 hari, pupa ukuran kecil, sedang, dan besar ditempatkan di dalam tabung reaksi bersama parasitoid selama sehari. Untuk mengamati jumlah keturunan, imago yang telah kopulasi dibiarkan memarasit setiap hari sampai parasitoid mati. Imago B. lasus dapat hidup sampai 3 hari tanpa pakan atau hanya tersedia air, 12-17 hari dengan pakan madu 10% tanpa memarasit, serta 10-13 hari dan memarasit. Keturunan yang dihasilkan oleh imago B. lasus selama hidupnya berkisar antara 71 126 ekor dengan rataan 98.2. Pupa E. thrax paling ideal dijadikan inang adalah pupa umur 13 hari. Inang yang masih stadia prapupa dan pupa umur diatas 5 hari dapat diparasit oleh B. lasus tetapi tidak muncul imago. Ukuran pupa berpengaruh positif terhadap parasitoid yang dihasilkan. Pupa berukuran kecil berpengaruh terhadap nisbah kelamin B. lasus. Kata kunci: Brachymeria lasus, Erionota thrax, Biologi reproduksi
Keyword: Brachymeria lasus, Erionota thrax, Reproduction biology

Judul: Biologi Parasitoid Brachymeria lasus Walker (Hymenoptera: Chalcididae) pada Ulat Penggulung Daun Pisang Erionota thrax Linnaeus (Lepidoptera: Hesperiidae)
Abstrak: This research was conducted to study some biological aspects of parasitoid, Brachymeria lasus , such as the life cycle, morphology , and the behavior. Research was carried out in The Laboratory of Parasitoid and Predator Biology, Department of Plant Protection, Bogor Agricultural University. Pupae of Erionota thrax parasitized by B. lasus were collected from the field and then were maintained in plastic containers until the emergence of parasitoid adults. Mated females of B. lasus were kept in a test tube (20 cm long, 3 cm in diameter), and then were provided with 1-day-old pupae of E. thrax to be parasitized. Parasitized pupae of E. thrax then were moved to another test tube and were used for observation of the parasitoid biology. The morphological features of the parasitoid larvae and pupae were observed by dissecting parasitized pupae every day starting on the second day after parasitization. To observe the life cycle of the parasitoid, parasitized pupae of E. thrax were maintained in test tubes until the eclosion of parasitoid adults. In general, adults of B. lasus (females and males) were black in color with the body size was less than 6 mm, and were characterized with the large femur of the hind legs. B. lasus have hymenopteriform eggs, hymenopteriform larvae, and exarate type pupae. The life cycle of B. lasus ranged 13-14 days. Adults of B. lasus mostly emerged in the morning within 07:00 - 11:00 hours
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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