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Issam Smaali,Souhir Jazzar,Asma Soussi,Murielle Muzard,Nathalie Aubry,M. Nejib Marzouki 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.2
Aqueous extracts from date by-products of the sucrose-rich variety “Deglet Nour” were used as a starting substrate to achieve the enzymatic synthesis of fructooligosaccharides (FOS) commonly used as prebiotics. A crude β-fructofuranosidase (Ffase) preparation from Aspergillus awamori NBRC4033 was immobilized on chitosan by covalent binding through glutaraldehyde linkages (Yi =88%, Ya = 54%), and used for this purpose. The effect of water-extraction volume on the FOS synthesis by transfructosylation was studied. It was found that 150 mL/100g of date by-products gave the best FOS concentration and productivity (123 g/L and 18.5 g/h/100 g respectively),related to an optimal sucrose conversion of 53.26%. The main FOS product was purified via a biogel-P2 gel filtration column. Its structure was determined as 1-kestose: α-Dglucopyranosyl-(1→2)-β-D-fructofuranosyl-(2→1)-β-Dfructofuranoside by combination of 1H, 13C and 2D-NMR techniques. Our results provide new insights into the enzymatic synthesis of FOS from an alternative source of sucrose, namely date by-products.
New class of liquid crystalline epoxy resins: Synthesis and properties
Issam Ahmed Mohammed,Mohd Fadhley Ali,Wan Rosli Wan Daud 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
A new class of liquid crystalline epoxy resins has been developed by reacting the diglycidyl ether of bisphenol A (DGEBA) with two new mesogenic diols, 3,30-dimethoxy-4,40-di(hydroxyhexoxy)-Nbenzylidene-o-tolidine and 4,40-di(6-hydroxyhexoxy)-N-benzylidene-o-tolidine, containing azomethine groups. Fourier transformed infra-red (FT-IR), nuclear magnetic resonance (NMR) spectroscopy and CHN elemental analysis were used to confirm the chemical structures of these azomethine mesogenic diols. Cure reaction between DGEBA and the mesogenic diols were carried out with different ratios 1:1, 1:2 and 2:1. The mesogenic phase transitions for azomethine mesogenic diols and cured polymers were examined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Thermal,mechanical and adhesion properties were then investigated for the cured polymers based on new azomethine mesogenic diols. The cured polymers were found to exhibit high thermal stability, flexibility and good adhesion properties compared to conventional resins.
A SELF SCALING MULTI-STEP RANK ONE PATTERN SEARCH ALGORITHM
ISSAM A.R. MOGHRABI 한국산업응용수학회 2011 Journal of the Korean Society for Industrial and A Vol.15 No.4
This paper proposes a new quickly convergent pattern search quasi-Newton algorithm that employs the multi-step version of the Symmetric Rank One (SRI). The new algorithm works on the factorizations of the inverse Hessian approximations to make available a sequence of convergent positive bases required by the pattern search process. The algorithm, in principle, resembles that developed in [1] with multi-step methods dominating the derivation and with numerical improvements incurred, as shown by the numerical results presented herein.
3-Hom-Lie superbialgebras and 3-Hom-Lie classical Yang-Baxter equations
Issam Bartouli,Imed Basdouri,Gaith Chaabane,Mohamed Fadous,Jean Lerbet 대한수학회 2024 대한수학회논문집 Vol.39 No.1
3-Lie algebras are in close relationships with many fields. In this paper we are concerned with the study of 3-Hom-Lie super algebras, the concepts of 3-Hom-Lie coalgebras and how they make a 3-Hom-Lie superbialgebras, we study the structures of such categories of algebras and the relationships between each others. We study a super twisted 3-ary version of the Yang-Baxter equation, called the super 3-Lie classical Hom-Yang-Baxter equation (3-Lie CHYBE), which is a general form of 3-Lie classical Yang-Baxter equation and prove that the superbialgebras induced by the solutions of the super 3-Lie CHYBE induce the coboundary local cocycle 3-Hom-Lie superbialgebras.