Judul: Fraksinasi Ekstrak Biji Bengkuang (Pachyrrhizus Erozus) Yang Berpotensi Sebagai Antifiakteri
Abstrak: SETIAWATI dan DEDEN SAPRUDIN. Bengkuang (Pachyrrhizus erozus) merupakan tanaman yang banyak dibudidayakan, umbinya digunakan untuk makanan dan kosmetika, sedangkan bijinya digunakan untuk insektisida dan cbat kulit. Pada penelitian inl dianalisis aktivitas ekstrak biji bengkuang temadap bakteri Staphylococcus aureus dan &cherichia coli. S. aureus merupakan bakteri yang paling banyak terdapat di kulit, sedangkan E. coli merupakan bakteri Gram negatifyang memiliki lingkungan habitat yang luas. Biji bengkuang diekstraksi menggunakan tiga jenis pelarut, yaitu heksana, aseton, dan air. Ekstrak dari ketiga pelarut diuji aktivitas antibakterinya. Alctlvitas antibakteri clapat ditunjukkan oleh daerah zona bening di sekitar kertas saring yang telah ruberi ekstrak biji bengkuang. Ekstrak yang memiliki aktivitas sebagai antibalcterl tertinggi difraksinasi menggunakan kromatografi lapis tipis preparatif. HasH fraksinasi diuji aktivitas antibakterinya, fraksi yang memiliki aktivitas tertinggi dianalisis menggtmakan spektrofotometer inframerah untuk mengetahui gugus ftmgsi yang terdapat pada senyawa aktiftersebut. Ekstrak yang memiliki
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Judul: Fraksinasi komponen aktif antibakteri ekstrak kulit batang tanaman berenuk (Crescentia cujete L)
Abstrak: The objectives of this research are to determine the most antibacterial active fraction of berenuk stem bark extracts, to determine minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), and to identify phytochemical constituents of the fraction. Preliminary screening of crude methanol extract and all fractionated extracts (n-hexane, ethyl acetate, and aqueous fraction) against Staphylococcus aureus (Gram positive) and Escherichia coli (Gram negative) were tested by disc-diffusion assay. The results showed that only methanol extract and its n-hexane and ethyl acetate fractions that could inhibit growth of all tested bacteria, and the most active fraction among all fractionated extract was n-hexane fraction. Fractionation of n-hexane extract using silica gel column chromatography (gradient elution) produced 10 fractions. All of the fractions showed antibacterial activities, and the most active was fraction II with percentage towards S. aureus was 35.86% and E. coli was 63.01%. The MIC towards S. aureus and E. coli were 0.2 and 0.1 mg/mL, and the MBC for both of bacteria were 10 and 5 mg/mL, respectively. Phytochemical screening showed that steroid and alkaloid were the active constituents of the fraction II. This result concludes that steroids and alkaloids from berenuk stem bark are potential as antibacterial agents.
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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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