Judul: Resistensi Relatif Beras Sosoh Lima Varietas Padi Asal Kabupaten Pati Terhadap Serangan Sitophilus Zeamais
Abstrak: Sithopilus zeamais merupakan hama gudang yang sering menyerang komoditas serealia terutama jagung dan beras di daerah tropis, seperti Indonesia. Tingkat kerusakan dipengaruhi oleh seberapa rentan beras terhadap serangan serangga. Penelitian ini bertujuan untuk mengetahui tingkat ketahanan varietas beras lokal di wilayah Indonesia terhadap serangga Sitophilus zeamais. Penelitian ini menggunakan 5 varietas beras, yaitu C4, IR64, Mentikwangi, Pandanwangi dan Rojolele sebagai varietas lokal yang banyak dibudidayakan di wilayah Pati. Sebanyak 200 gram sampel dari setiap varietas diinfestasi dengan 50 ekor serangga dewasa Sitophilus zeamais kemudian diinkubasi selama 3 bulan pada kondisi ruang. Parameter yang diamati pada akhir penelitian adalah populasi serangga, persen biji berlubang, persen fraksi bubuk (frass), persen kenaikan fraksi air, persen susut bobot kering, dan persen kehilangan bobot. Berdasarkan hasil penelitian varietas beras yang paling resisten terhadap serangan Sitophilus zeamais adalah IR64, sedangkan varietas yang paling rentan adalah Mentikwangi. Hasil uji korelasi menunjukkan adanya hubungan antara populasi serangga dalam beras dengan persen biji berlubang, persen fraksi bubuk (frass), persen kenaikan fraksi air, persen susut bobot kering dan persen kehilangan bobot.
Keyword: beras sosoh, penyimpanan, resistensi relatif, Sitophilus zeamais, varietas padi

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: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology