Judul: Efek Zat Antibakteri Daun Torbangun (Coleus amboinicus Lour) terhadap Bakteri yang Berasal dari Makanan Basi
Abstrak: Penggunaan komponen tumbuhan sebagai tujuan farmaseutikal meningkat dalam beberapa studi terakhir. Produk-produk tumbuhan mempunyai sifat antibakteri karena adanya komponen aktif yang dapat disintesis didalamnya. Daun Torbangun diyakini memiliki khasiat sebagai penawar racun (antibakteri) dan obat untuk menyembuhkan penyakit seperti sariawan dan batuk. Penelitian ini bertujuan untuk mengetahui efek zat antibakteri daun Torbangun terhadap bakteri yang berasal dari makanan basi serta mengetahui efek dari zat antibakteri daun Torbangun sebagai bahan obat herbal. Penelitian memiliki beberapa tahapan yaitu Pemilihan sampel pada 30 orang mahasiswa IPB, Isolasi dan identifikasi bakteri, Uji Perlakuan daun Torbangun, dan Uji aktivitas antibakteri. Terdapat perbedaan nyata (p<0.05) aktivitas zat antibakteri perlakuan ekstrak terhadap perlakuan lainnya (daun yang dikeringkan, direbus, dan ditumbuk). Setelah dilakukan uji regresi linear, tidak terdapat perbedaan nyata antara jenis perlakuan terhadap luas hambatan diameter zona hambat terhadap bakteri gram positif maupun gram negatif (p>0.05).
Keyword: aktivitas antibakteri, bakteri, daun Torbangun (Coleus amboinicus Lour), perlakuan

Judul: Evaluasi Kandungan Nutrisi Daun Torbangun (Coleus amboinicus Lour) terhadap Daya Hidup Mikroba Rumen dan Kecernaan In vitro
Abstrak: This research was conducted to examine the effect of torbangun (Coleus amboinicus Lour) in the diet on the viability of rumen microbes (bacteria and protozoa populations) and in vitro digestibility, using randomized block design with rumen liquid collecting time as a group with 5 treatments and 3 replicates. The treatments were: R0 (kontrol): 60% H + 40% K, R1: RO + 2.5% T, R2: RO + 5% T, R3: RO + 7.5% T, R4: RO + 10% T. Data were analyzed by Analysis of Variance. Further tested Contrast Ortogonal and Polynomial, if there was significant differences. Parameters that measured include: viability rumen of microorganisms (bacteria and protozoa populations), fermentability (the concentration of TVFA and N-NH3), and digestibility (dry and organic matter) in the rumen. The experiment showed that treatments significantly (P<0.05) affected dry matter digestibility and VFA concentration on additional treatment torbangun leaves as much as 2.5% in the ration (R1).
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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