Judul: Pengaruh Proses Pelleting Terhadap Kelarutan dan Aktivitas Anti Bakteri Daun Torbangun (Coleus amboinicus Lour)
Abstrak: Torbangun (Coleus amboinicus Lour) is a herb that can be used as feed supplement. Processing torbangun into pellets is one of the way to keep the nutritional content to not easily damaged, improve efficiency and can be saved. The purpose of this research was to study the effect of processing plants into pellets with different water content on the solubility and antibacterial activity of torbangun (Coleus amboinicus Lour). The experimental design of this study used a Completely Randomized Design (CRD) of 3 treatments, which were P1 (12%), P2 (13.5%), and P3 (15%) with 3 replications. The variables measured were solubility and anti-bacterial Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Salmonella typhimurium. The results showed that the pelleting process lowered the value of the solubility and antibacterial activity in torbangun. Different levels of water content had no effect on the solubility, while the antibacterial activity showed different result depending on the type of bacteria because each bacteria react differently.
Keyword: torbangun., test the inhibition of bacterial, solubility test

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: 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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