Judul: Kandungan Asam Fitat dan Kualitas  Dedak Padi yang Disimpan dalam Keadaan Anaerob.
Abstrak: The aim of this research was to study the physical characteristics, dry matter digestibility (DMD), organic matter digestibility (OMD) , and the occurance of the fungi as well as the content of phytic acid in rice bran stored in the anaerobic condition. The experiment was carried out using a Factorial randomized completely design with 2 factors and 3 replication. Factor A consisted of P1 = Rice bran without treatment (control), P2 = Silage of rice bran without additive, P3 = Silage of rice bran with additive and P4 = Silage of rice bran dried. Factor B consisted of time of storage i.e : 0 weeks, 6 weeks and 12 weeks. The variables observed in this experiment were the organoleptic characteristics (the physical characteristics of rice bran), the phytic acid, DMD, OMD, and the occurance of insects. The data were analyzed using analysis of variance (ANOVA) and differences among treatments were tested by orthogonal contrast test (Steel and Torrie, 1993). The results showed that the treatments of fermentation and time of storage were significantly (P<0.01) decreased the phytic acid from 6.7% until 2.07% and increased the DMD and OMD value. There were interaction between time of storage and the treatmens on the content of phytic acid and DMD, but it was not happened in the DMO value. The phytic acid content was the lowest in the treatment P2 stored during 12 weeks. The DMD value in P2 and P3 were higher (P<0.01) than those of P1 and P4 (P<0.01). It is concluded that the quality withstanded phytic acid decreased and digestibility increased when rice bran was stored under anaerobic condition.
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Judul: Effect of storage time, packaging type, and antioxidant addition of physical and chemical quality of rice bran
Abstrak: Lama penyimpanan cenderung meningkatkan kadar air bahan yang akan menunjang pertumbuhan jamur. Penelitian ini bertujuan mengevaluasi kualitas fisik dan kimia dedak padi dengan penambahan antioksidan pada lama penyimpanan dan jenis kemasan berbeda. Rancangan penelitian yang digunakan adalah rancangan acak lengkap faktorial 3x4 dengan 4 ulangan. Faktor W yaitu lama penyimpanan (W0: 0 minggu, W4: 4 minggu, dan W8: 8 minggu) dan faktor P yaitu jenis kemasan (P1: karung goni + 0 ppm antioksidan, P2: karung goni + 125 ppm antioksidan, P3: hermetik + 0 ppm antioksidan, dan P4: hermetik + 125 ppm antioksidan). Hasil penelitian didapatkan bahwa lama penyimpanan dan jenis kemasan dapat mempengaruhi populasi serangga, kadar air, dan kadar protein kasar dedak padi. Hasil penelitian juga didapatkan bahwa lama penyimpanan dan jenis kemasan berpengaruh nyata (P<0,05) terhadap kerapatan tumpukan, kerapatan pemadatan tumpukan, dan berat jenis dedak padi. Dapat disimpulkan bahwa jenis kemasan hermetik dapat mempertahankan kualitas fisik dan kimia dedak padi hingga penyimpanan 8 minggu. Penambahan 125 ppm antioksidan belum efektif dalam mempertahankan kualitas fisik dan kimia dedak padi., Long storage tends to increase moisture content of the material which will support the growth of mold. This research was conducted to evaluate physical and chemical quality of rice bran with antioxidant addition at different storage time and packaging type. The experiment using completely randomized design factorial 3x4 with 4 replications. Factor W was storage time (W0: 0 week, W4: 4 weeks, and W8: 8 weeks) and factor P was packaging type (P1: jute sac + 0 ppm antioxidant, P2: jute sac + 125 ppm antioxidant, P3: hermetic + 0 ppm antioxidant, and P4: hermetic + 125 ppm antioxidant). The result found that storage time and packaging type can affected insect population, moisture content, and crude protein. The result also found that storage time and packaging type significantly (P<0.05) affected bulk density, tapped density, and true density. Based on result can be concluded that hermetic packaging can maintaining physical and chemical quality of rice bran for up to 8 weeks of storage. 125 ppm antioxidant addition have not been effective in mainting physical and chemical quality of rice bran.
Keyword: antioxidant, hermetic, jute sac, rice bran, storage

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