Sung-sook Yoon

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The enzyme AHAS (acetohydroxy acid synthase), which is involved in the biosynthesis of valine, leucine and isoleucine, is the target of several classes of herbicides. A model of tobacco AHAS was generated based on the X-ray structure of yeast AHAS. Well conserved residues at the herbicide-binding site were identified, and the roles of three of these(More)
The enzymes phosphoglucomutase (PGM) and phosphomannomutase (PMM) play an important role in the synthesis of extracellular polysaccharide. By colony hybridization of the fosmid library of Sphingomonas chungbukensis DJ77, an open reading frame (ORF-1) of 1,626 nucleotides, whose predicted product is highly homologous with other PGM proteins from several(More)
With the rapid changes taking place in the network operation environment, ISPs today face a challenge. Networks are becoming more complex with the inclusion of diverse types of devices. New services such as IPTV and VoIP make the jobs of network administrators more difficult, by requiring new equipment, with new protocols and new technologies. As well, ISPs(More)
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