Judul: Biologi Sycanus annulicornis (Hemiptera: Reduviidae) pada tiga spesies mangsa
Abstrak: Serangga predator merupakan salah satu musuh alami yang dapat mengendalikan serangga hama. Salah satu jenis predator adalah Sycanus annulicornis (Hemiptera:Reduviidae). Penelitian ini dilaksanakan dari bulan Maret-Juni 2003 di Laboratorium Ekologi Serangga, Fakultas Pertan\an, Institut Pertanian Bogor. Penelitian ini bertujuan untuk mengetahui .... ' pengaruh biologi Sycanus annulicornis Hemiptera:Reduviidae) terhadap tiga serangga mangsa. Mangsa terdiri dari tiga jenis yaitu Spodoptera litura, CroCidolqmia pavonana, dan Corcyra cephalonica yang diambil dari lapang, Pengamatan~ dilakukan sejak nimfa menetas hingga menjadi menjadi imago dan meletakkan telur. Pada stadia nimfa ukuran terpanjang pada instar II terdapat pada nimfa yang di beri mangsa C. cephalonica, dan pada instar IV sampai instar V ukuran terpanjang terdapat pada nirnfa yang diberi mangsa S. litura. Pada instar III sampai imago, mangsa tidak berpengaruh nyata pada ukuran panjang Sycanus annulicornis. Jenis mangsa tidak berpengaruh pada lama stadium instar I sampai instar IV, sedangkan pada instar V, nimfa yang diberi mangsa C. cephalonica mengalami lama stadium yang lebih pendek. Jenis mangsa berpengaruh terhadap kematian nimfa. Salah satu penyebab kematian adalah karena terjadinya pemangsaan tehadap nimfa oleh mangsa.
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Judul: Pengaruh Tiga Jenis Mangsa terhadap Biologi Kepik Predator Sycanus annulicornis Dohrn. (Hemiptera: Reduviidae)
Abstrak: The objective of the research was to study the effects of (1) three different spesies of preys on the biology of predator S. annulicornis, (2) ratio of female to male on the fecundity and fertility of the predator, and (3) prey status on the predator behaviors. The research was held at Ecology Laboratory, Departemen Proteksi Tanaman, Fakultas Pertanian, IPB, since July 2005 until June, 2006. Predator S. annulicornis was collected from agricultural field of Kebun Percobaan IPB Sawah Baru and Situ Gede, Darmaga Bogor. Preys used were Corcyra cephalonica Stainton (Lepidoptera: Pyralidae), Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae), and Spodoptera litura Fabricius (Lepidoptera: Noctuidae), both as dead and alive larvae. Larvae and adult of C. cephalonica was collected from rice warehouse at Cianjur and surroundings, larvae T. molitor from local market at Bogor, while larvae S. litura from soybean fields at Kampus IPB Darmaga. Those preys then were reared in the laboratory. The study revealed that C. cephalonica was the most suitable prey for S. annulicornis. It resulted in the lower mortality rate (17,5%), shorter nymphal period (51,42 days), longer longevity (30,25 days), higher adult weight (0,12 g) and higher ECI value (33,46%). On the other hand, S. litura was unsuitable prey for S. annulicornis. It resulted in higher mortality rate (70%), longer nymphal period (58,31 days), shorter longevity (18,50 days), lower adult weight (0,07 g), and lower ECI value (8,32%). The sex ratio of 1:2 was the most suitable for mass rearing of the predator in laboratory, because it generated highest fecundity (74,14 eggs) and highest fertility (65,14 eggs). Prey given as dead larvae did not affect the predatory behavior of the offsprings.
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Judul: Implementasi Jaringan Peer-to-Peer Tak Terstruktur Menggunakan Protokol JXTA
Abstrak: Internet is useful for communication, exchanging information, and businesses. Most internet network is based on client-server system, which is a centralized network. The server acts as the center of network and has the ability to transfer data as requested by the client. In a client-server system, the network will be down if the server is busy or interrupted. This disadvantage can be solved by Peer-to-Peer (P2P) network. In P2P network, client or “peer” can communicate with other peers without relying on the server. One of the P2P network protocols is JXTA protocol, an open source protocol that can connect mobile devices or computers to P2P network. The objective of this research was to implement the unstructured P2P application by using JXTA protocol and additional peer group. In this research, the features of investigated P2P application were chatting within peer group, searching for files, and downloading files. It was found that these features can only be performed by peers that were directly connected to other peers in the same subnet. Furthermore, this research showed that the highest percentage of overhead file was 10.13% and the percentage of overhead protocol did not exceed 0.5%
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