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    ABSTRACT: The crystal structure of the title compound, CHBrO·CHCl, prepared in six steps from diosgenin, confirmed that the configurations of the stereogenic centers, positions 20 and 25, remain unchanged during the reaction. The six-membered , and rings have chair conformations. The five-membered ring has an envelope conformation (with the methyl-substituted C atom fused to ring as the flap) and the six-membered dihydro-pyran ring adopts a twist-boat conformation. In the crystal, mol-ecules are linked C-H⋯O and C-H⋯Cl hydrogen bonds, the latter involving the dichloro-methane solvent mol-ecule, forming a three-dimensional supra-molecular network.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3260-1.
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    ABSTRACT: Pectin lyases cleave the internal glycosidic bonds of pectin by β-elimination, producing non-saturated galacturonic oligomers. Genetic improvement of pectin lyase-overproducing strains is still necessary to improve industrial processes based on this enzyme. In the present study hybrids were obtained by protoplast fusion between mutant pectinolytic Aspergillus flavipes and Aspergillus niveus CH-Y-1043 strains. Prototrophic segregants showed different isoenzymatic profiles and produced increased levels of pectin lyase in cultures containing lemon peel as a sole carbon source. Hybrid HZ showed an increase of 450% and 1300% in pectin lyase production compared with that of A. niveus CH-Y-1043 and A. flavipes, respectively. Pectin lyase produced by the hybrid HZ was partially purified and used for the hydrolysis of orange peel. Pectin lyase was able to hydrolyze 56% of orange peel biomass. However, addition of 2 RFU and 20 U of endo- and exo-polygalacturonase, respectively, induced the hydrolysis of 92% of orange peel solids. In conclusion HZ is a pectin lyase-overproducing hybrid with potential applications in the pectin industry.
    Enzyme and Microbial Technology. 01/2009;
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    ABSTRACT: In the last decade, numerous investigations over chaos theory applied had been published. Many areas are covered by these documents including communications, control, and theory of circuits amongst others. A wide range of applications have been proposed and each day there are more specialists in this matter. In this way, this document expects to be a summary of some of the most relevant characteristics of chaos generators which could be applied accordingly with the necessities of different areas. Through numerical analysis and simulations is showed a simple method for manipulations for this kind of systems and brings some relevant differences between three dissimilar chaotic systems for potential applications and it is the first of a group of three documents on chaos theory applied in communications.
    Electronics, Robotics and Automotive Mechanics Conference, 2007. CERMA 2007; 10/2007


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    Mérida, Mexico
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African journal of agricultural research 01/2013; 8(12):1050-1058.
Fungal Genetics and Biology 04/2013;

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