Judul: Resistensi Relatif Beras Pecah Kulit dan Beras Sosoh Lima Varietas Padi asal Banyumas terhadap Serangan Sitophilus oryzae
Abstrak: The purpose of this study was to examine the resistance level of five different variety of brown rice and milled rice from Sitophilus oryzae attack during storage. Five varieties of rice that examined were Pandanwangi, Inpari 13, IR-64, Situ Bagendit, and Srikandi which all were planted in Banyumas region. This research was conducted in two experiments. The first experiment is done to measure the growth of Sitophilus oryzae during storage, while the second experiment is done to measure the rate of loss during storage. In the first experiment, 200 seeds of rice was infested by 5 couples of Sitophilus oryzae aged 7-15 days and kept for 7 days. The insects were then removed and the rice was observed every day for 14 days for emergence of the first generation (F1) of insects. The progenies were counted every day until there were no emergence for five consecutive days. The experiments were conducted in three replications. From this experiment, the parameters were number of progenies (Nt), development period (D), development index (ID), intrinsic rate of increase (Rm), and weekly multiplication capacity (λ). In second experiment, 100 g of rice infested by 25 insects and stored for 6 weeks. After 6 weeks, insects were removed and the storage loss were determined. In this second experiment, the parameters observed were percentage increase of water fraction, the loss of dry matter loss, and percentage of frass. Those two experiments were conducted in three replication. According to this experiment, Srikandi rice has the highest resistance towards Sitophilus oryzae attack among other varieties.
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Judul: Kajian Resistensi Lima Jenis Beras Varietas Lokal Terhadap Serangan Sitophilus zeamais Motsch.
Abstrak: The present study was conducted to evaluate resistance of local rice varieties i.e. Batutegi, Silugonggo, Ciherang, Mamberamo and Indragiri from the attack of post harvest pest Sitophilus zeamais Motsch. The research was divided into two stages, the preparation and the experiments. In the preparation, S. zeamais culture was cultured to get adult S. zeamais aged 7-14 days. In the first experiment, 10 adult insects aged 7-14 days were infested for 7 days. The adults were then removed and discarded. The infested grains were incubated to allow the emergence of progenies. The emerged progenies were counted daily till there was no emergence for 5 days consecutively. From this experiment, the parameters were number of progenies (Nt), development period (D), development index (ID), intrinsic rate of increase (Rm) and weekly multiplication capacity (λ). In the second experiment, 100 gram of rice was infested with 25 adults of S. zeamais for 5 weeks. From this experiment, the parameters used were percentage of weight loss and percentage of holed grain. Based on number of progenies (Nt), development index (ID), intrinsic rate of increase (Rm), weekly multiplication capacity (λ), percentage of weight loss and percentage of holed grain, showed that Silugonggo variety was the most resistance among other tested rice varieties. The values are 57, 12.5239, 0.3781, 1.4596, 10.94%, and 12.45% respectively.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular