Judul: Isolasi, Identifikasi, dan Aktivitas Antibakteri Minyak Asiri  Daun dan Rimpang Temu Mangga (Curcuma mangga)
Abstrak: Minyak asiri temu mangga yang berasal dari Kebun BALITTRO Cibinong belum pernah diteliti. Penelitian ini bertujuan mengisolasi, mengidentifikasi kandungan senyawa kimia, dan menganalisis aktivitas antibakteri minyak asiri daun dan rimpang temu mangga. Minyak asiri diisolasi menggunakan metode distilasi uap. Kandungan senyawa kimia dalam minyak asiri diidentifikasi menggunakan kromatografi gas–spektrometri massa. Aktivitas antibakteri diuji dengan metode difusi cakram terhadap Escherichia coli dan Salmonella typhi. Rendemen minyak asiri daun temu mangga adalah 0,051% berdasarkan bobot kering sampel, sedangkan pada minyak asiri rimpang diperoleh 0,17% berdasarkan bobot basah sampel. Kesamaan senyawa kimia dalam kedua minyak asiri tersebut ialah humulena, 3,7,11-trimetil-2,6,10-dodekatriena-1-ol, isoaromadendrena epoksida, dan (E,E)-3,7-dimetil-10-(1-metiletiliden)-3,7- siklodekadiena-1-on. Minyak asiri daun dan rimpang temu mangga tidak menunjukkan aktivitas antibakteri pada konsentrasi (500.000; 10.000; 5000; 2500) µg/mL terhadap E. coli dan S. typhi. Kata kunci: antibakteri, GC-MS, minyak asiri, temu mangga, Mango turmeric essential oils from BALITTRO Garden Cibinong have never been studied. This study aims to isolate and identify chemical compounds and analyze the antibacterial activity of mango turmeric leaves and rhizomes essential oils. Essential oils are isolated using the steam distillation method. The chemical compounds in essential oils were identified using gas chromatography- mass spectrometry. The disc diffusion method determined the antibacterial activity against Escherichia coli and Salmonella typhi. The yield of mango turmeric leaves essential oils was 0,051% based on the dry weight of the sample, while the rhizomes essential oil was 0,17% based on the wet weight of the sample. The chemical compounds that are the same in both essential oils are humulene, 3,7,11-trimethyl-2,6,10-dodecatriene-1-ol, isoaromadendrene epoxide, and (E,E)- 3,7-dimethyl-10-(1-methylethylidene)-3,7-cyclodecadiene-1-one. Mango turmeric leaves and rhizomes essential oils did not show antibacterial activity at concentrations (500.000; 10.000; 5000; 2500) µg/mL against E. coli and S. typhi. Keywords: antibacterial, essential oils, GC-MS, mango turmeric
Keyword: Antibakteri, GC-MS, Minyak Asiri, Temu Mangga

Judul: Fraksi Distilat pada Distilasi Rebus Minyak Atsiri Rimpang Temu Hitam (Curcuma aeruginosa) dan Aktivitas Antibakterinya
Abstrak: Minyak atsiri rimpang temu hitam memiliki potensi sebagai antibakteri. Penelitian ini bertujuan menentukan waktu distilasi rebus yang optimum untuk menghasilkan minyak atsiri rimpang temu hitam dengan aktivitas antibakteri terbaik. Senyawa yang terdapat di dalam minyak atsiri rimpang temu hitam diidentifikasi menggunakan gas chromatography-mass spectrometry (GC-MS). Kandungan senyawa dominan tertinggi dari semua waktu distilasi pada minyak atsiri rimpang temu hitam adalah epikurzerenon (45%), eukaliptol (70,14%), dan kamfor (15,27%). Aktivitas antibakteri minyak astiri rimpang temu hitam ditentukan dengan metode difusi cakram terhadap bakteri Streptococcus mutans, Escherichia coli, dan Staphylococcus aureus. Potensi antibakteri terbaik didapatkan pada lama waktu distilasi 30 menit pertama untuk bakteri S. mutans, 30 menit kedua untuk bakteri E. coli, dan 30 menit kelima untuk bakteri S. aureus., Temu hitam’s rhizome essential oil has potential as an antibacterial. This study aims to determine the optimum length of boiled distillation time to produce temu hitam’s rhizome essential oil with the best antibacterial activity. Compounds contained in the essential oil of temu hitam’s rhizome were identified using gas chromatography-mass spectrometry (GC-MS). The highest content of the dominant compounds from all times of distillation in temu hitam’s rhizome essential oil was epicurzerenone (45%), eucalyptol (70.14%), and camphor (15.27%). Antibacterial activity of temu hitam’s rhizome essential oil was determined by disc diffusion method against Streptococcus mutans, Escherichia coli, and Staphylococcus aureus. The best antibacterial potential was obtained in the first 30 minutes of distillation for S. mutans bacteria, the second 30 minutes for E. coli bacteria, and the fifth 30 minutes for S. aureus bacteria.
Keyword: Antibakteri, Distilasi Rebus, GC-MS, Minyak Atsiri

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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