Judul: Evaluasi Perubahan Metabolit pada Temulawak dengan Waktu Tanam Berbeda
Abstrak: Curcuma is an indigenous plant of Indonesia which processes biological activity as an antioxidants. Metabolites which play a role in the antioxidant activity of curcuma are curcuminoids the concentration of which are influenced by planting time. FTIR spectroscopy is a qualitative method of used to distinguish the changes in metabolites of curcuma at different planting time. The aims of this research is to correlate levels of curcuminoids and xanthorrizol with the antioxidants capacity and to evaluate and distinguish metabolite changes in rhizomes of curcuma at different planting time using FTIR. The antioxidant activity determined by three methods which is DPPH, FRAP and CUPRAC. The content of curcuminoids and xanthorrizol determined by HPLC method. The results showed that the age of nine months of curcuma has the highest concentration of curcuminoids and xanthorrizol. Based on correlation analysis it was found that the antioxidant capacity of DPPH method has a positive correlation (0.757 r 0.996) with curcuminoids or xanthorrizol, like that on the method of FRAP (0.522 r 0.976). In CUPRAC method a high correlations indicated by total yield (r = 0.986). FTIR spectral analysis gave absorption for functional group of OH (3389-3371 cm-1), carbonyl group (1628 cm-1), vibration stretching C-H by 2855-2962 cm-1 and 1053 cm-1. FTIR spectroscopy can be used to analyze changes in metabolites in different planting time.
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Judul: Variation of Antioxidant Activity and Total Flavonoid Content of The Rhizome  of Curcuma xanthorrhiza Roxb. with Three Different Cultivation Locations
Abstrak: Temulawak (Curcuma xanthorrhiza Roxb.) dapat menghasilkan metabolit sekunder dan memiliki peran sebagai sumber antioksidan. Temulawak dapat menghasilkan variasi akumulasi metabolit sekunder jika ditanam pada lokasi dengan kondisi lingkungan yang berbeda-beda. Penelitian ini bertujuan memperoleh pola interaksi genotipe temulawak dengan lingkungan penanaman multilokasi (Bogor, Cianjur, dan Sukabumi) serta memperoleh hasil evaluasi stabilitas dari setiap genotipe. Kadar total flavonoid temulawak tertinggi diperoleh dari penanaman di Sukabumi dengan nilai 21,3791 mg QE/g bobot kering. Genotipe dengan kadar total flavonoid tertinggi adalah G6 dengan nilai 23,2428 mg QE/g bobot kering. Aktivitas antioksidan tertinggi berdasarkan lokasi diperoleh dari penanaman di Sukabumi dengan nilai 9,6371 μmol TE/g bobot kering dan berdasarkan genotipe yakni G3 dengan nilai 9,1943 μmol TE/g bobot kering. Keragaman ulangan berpengaruh nyata pada parameter kadar total flavonoid dan tidak ditemukan interaksi genotipe dan lingkungan pada kedua parameter. Genotipe yang stabil pada ketiga lokasi (Bogor, Cianjur, Sukabumi) adalah G5 untuk kadar total flavonoid dan G3 dan G4 untuk aktivitas antioksidan. Genotipe G5 memiliki potensi stabil pada lokasi penanaman di Bogor dengan parameter aktivitas antioksidan.
Keyword: antioxidant, flavonoids, multilocation, temulawak

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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