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 Reproduksi Brachymeria Lasus Walker (Hymenoptera: Chalcididae) pada Ulat Penggulung Daun Pisang Erionota Thrax Linnaeus (Lepidoptera:Hesperiidae)
Abstrak: The objective of this research was to obtain information on the life span and some reproduction characteristics of Brachymeria lasus adults, including number of offsprings produced by a single parasitoid, sex ratio, and the most suitable host pupal age for parasitoid development. The research was carried out in The Laboratory of Biological Control, Department of Plant Protection, Bogor Agricultural University. Parasitoids B. lasus were obtained by collecting pupae of Erionota thrax parasitized by B. lasus from the field, and then were kept in plastic containers in the laboratory. Rearing of B. lasus was conducted by putting a copulated female of parasitoid in a test tube provided with fresh pupae of E. thrax to be parasitized, and fed with 10% honey solution. Effect of food and host (no food no host, with water no host, with 10% honey no host, and with 10% honey with host) on the life span of parasitoid adults was observed. To observe the total number of offsprings, a copulated female was provided with fresh host pupae (one pupa or two daily as needed) every day until the parasitoid died. To find the suitable host pupal ages for parasitoid development, a different age of host i. e. prepupae, 1, 2, 3, 4, 5, and 6 day-old pupae, each was exposed to a different copulated parasitoid female for 18 hours. Effect of three different sizes of host pupae (small, medium, and large) on the parasitoid offspring production was also observed. Females of B. lasus provided with 10% honey solution as food with or without pupae as host could live longer (12-17 days and 10-13 days, respectively) compared to those without food or fed with water only which could live for only 3 days. Number of offsprings produced by a female of B. lasus ranged 71-126, with the average of 98.2. Parasitoid B. lasus could develop successfully in 1-3 day-old host pupae. The parasitoid could parasitize prepupae and pupae older than 5 days but the parasitoids could not complete their develpoment. The host pupal size affected the number and the sex ratio of parasitoids emerging from a single host pupae.
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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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