Judul: The Effect of soybean pre-treatment on the quality of soymilk
Abstrak: Three factors, namely hulling, cooking time, and the fermentation time were investigated for their effect on the quality of soymilk. Analysis of variance showed no significant differences between hulled and unhulled treatment on the water soluble protein, pH of soymilk after processing, and general acceptability of soymilk formulated with 20 ppm vanilla. However, total protein content, amino acid nitrogen, viscosity, pH of soymilk before processing, and general acceptability of soymilk formulated with 20% fresh milk are significantly affected. Treatment of unhulled soybean shows higher values than hulled soybean. There is relationship between cooking time and total nitrogen content, water soluble protein, and viscosity. Regression analyses showed that the total protein content, water soluble protein and viscosity decreased and reached the minimum value when soybean was cooked between 10 to 20 minutes, but increased again as heating continued to 30 minutes....
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Judul: Pengaruh Penambahan Susu Full cream terhadap Mutu Soygurt
Abstrak: Soygurt is the fermented product of lactic acid bacteria on soybean extract. Soygurt are generally has an unpleasant odor typically preferred as soy beans. Soygurt has a high nutrient content which is proximately same as yogurt. One attempt of the addition of full cream milk is to improve taste. This research was conducted to see the effect of full cream milk addition to the acceptance rate of set soygurt. Soygurt on the research is using the bacteria Streptococcus thermophilus and Lactobacillus bulgaricus. The addition of full cream milk is done by four different concentrations (0%, 3%, 5%, and 7%). The making of soybean extract is using modified Illinois method. Soybean extract added sugars as much as 6% and then pasteurized. After that, the extract of soy is cooled down to temperatures of 450C and innoculated starter culture as much as 5%. Incubation is done for 16 to 18 hours at a temperature of 370C. The results can be concluded that the addition of full cream milk on soygurt’s characteristics against influential include pH, total of lactic acid, viscosity, and organoleptic (appearance, texture, aroma, flavor, and overalls. The treatment with the addition of full cream milk by as much as 5% and 7% did not different. Product with the addition of full cream milk as much as 7% was chosen as the best because it has the highest organoleptic score compared to the three.
Keyword: full cream milk., lactic acid fermentation, soygurt

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf