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Cyclic Peptide Facial Amphiphile Preprogrammed to Self-Assemble into Bioactive Peptide Capsules
Chung, Eun Kyung,Lee, Eunji,Lim, Yong-beom,Lee, Myongsoo WILEY-VCH Verlag 2010 Chemistry Vol.16 No.18
<B>Graphic Abstract</B> <P>Programmed assembly: A unique supramolecular building block, a cyclic peptide facial amphiphile, predestined to self-assemble into a nanocapsule structure, has been developed (see figure). This general strategy will allow the easy construction of a variety of bioactive nanocapsules. <img src='wiley_img_2010/09476539-2010-16-18-CHEM200903145-content.gif' alt='wiley_img_2010/09476539-2010-16-18-CHEM200903145-content'> </P>
Ahn, Jungoh,Chung, Bevan K S,Lee, Dong-Yup,Park, Myongsoo,Karimi, Iftekhar A,Jung, Joon-Ki,Lee, Hongweon Published by Elsevier/North Holland on behalf of t 2011 FEMS microbiology letters Vol.324 No.1
<P>We explored the physiological and metabolic effects of different carbon sources (glucose, fructose, and glucose/fructose mixture) in phosphoglucose isomerase (pgi) knockout Escherichia coli mutant producing shikimic acid (SA). It was observed that the pgi(-) mutant grown on glucose exhibited significantly lower cell growth compared with the pgi(+) strain and its mixed glucose/fructose fermentation grew well. Interestingly, when fructose was used as a carbon source, the pgi(-) mutant showed the enhanced SA production compared with the pgi(+) strain. In silico analysis of a genome-scale E. coli model was then conducted to characterize the cellular metabolism and quantify NAPDH regeneration, which allowed us to understand such experimentally observed attenuated cell growth and enhanced SA production in glucose- and fructose-consuming pgi(-) mutant, respectively with respect to cofactor regeneration.</P>
Park, Myoung-Hwan,Ryu, Ja-Hyoung,Lee, Eunji,Han, Kyung-Hee,Chung, Yeon-Wook,Cho, Byoung-Ki,Lee, Myongsoo Hu@thig & Wepf 2006 Macromolecular Rapid Communications Vol.27 No.19
<P>Summary: We have prepared hexa-p-phenylene based rod-coil molecules with identical coil volume fractions, but different poly(propylene oxide) (PPO) coil architectures (linear versus dibranched), and investigated their self-assembling behavior in the solid state by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) techniques. Rod-coil molecules with a linear PPO coil showed a honeycomb-like lamellar assembly of rod segments with hexagonally arrayed PPO coil perforations. In contrast, the rod-coil molecules with dibranched PPO coils self-organized into rod bundles with a body centered tetragonal symmetry surrounded by a PPO coil matrix. These results demonstrate that the steric hindrance at the rod/coil interface arising from coil architectural variation is a dominant parameter governing supramolecular rod assembly in the rod-coil system.</P><P> <img src='wiley_img/10221336-2006-27-19-MARC200600445-gra001.gif' alt='wiley_img/10221336-2006-27-19-MARC200600445-gra001'> Graphic TEM images and schematic illustrations of the self-assembled structures of rod-coil molecules with linear (left) and dibranched (right) PPO coils, respectively. </P>
You-Young Jin,Kyung Ju Ku,Jiyong Park,Jonghyun Park,Myongsoo Chung,Kisung Kwon,Kyungsook Chung,Misun Won,Kyung Bin Song 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.4
Enterobacter sakazakii, Salmonella typhimurium, and Bacillus cereus were evaluated on inoculated infant formula by gamma irradiation treatment as a method to provide microbial safety. The infant formula inoculated with the major pathogenic bacteria was treated at irradiation dose of 0, 3, 5, and 10 kGy, respectively. After treatment, the samples were individually packaged and stored at 20℃. Microbiological data during storage represented that the populations of E. sakazakii, S. typhimurium, and B. cereus were reduced with the increase of irradiation dose by 4 to 5 log reductions. In particular, E. sakazakii, S. typhimurium, and B. cereus were eliminated at 10, 5, and 3 kGy, respectively. E. sakazakii was the most radiation-resistant, while B. cereus was the least. Our results represent that gamma irradiation below 10 kGy should eliminate the growth of the major pathogenic bacteria in infant formula during storage.
Disinfection of Iceberg Lettuce by Titanium Dioxide-UV Photocatalytic Reaction
KIM, YOUNGBONG,CHOI, YOONJUNG,KIM, SOOHYUN,PARK, JONGHYUN,CHUNG, MYONGSOO,SONG, KYUNG BIN,HWANG, INGYUN,KWON, KISUNG,PARK, JIYONG International Association for Food Protection 2009 Journal of food protection Vol.72 No.9
<P>Securing the physical quality and microbial safety of fresh foods has been a major focus in the food industry. To improve quality and increase the shelf life of fresh produce, disinfection methods have been developed. Titanium dioxide (TiO2) photocatalytic reactions under UV radiation produce hydroxyl radicals that can be used for disinfection of foodborne pathogenic bacteria. We investigated the effects of TiO2-UV photocatalytic disinfection on the shelf life of iceberg lettuce. Counts of natural microflora (total aerobic bacteria, coliforms, psychrotrophic bacteria, and yeasts and molds) and inoculated pathogenic bacteria (Escherichia coli, Listeria monocytogenes, Staphylococcus aureus, and Salmonella Typhimurium) on iceberg lettuce were determined after 20-min treatments with TiO2-UV, UV radiation, a sodium hypochlorite (NaOCl) solution, and tap water. TiO2-UV treatment reduced the number of microorganisms by 1.8 to 2.8 log CFU/g compared with reductions of 0.9 to 1.4 and 0.7 to 1.1 log CFU/g obtained with UV radiation and NaOCl treatments, respectively. Treatment with tap water was used as a control and resulted in no reductions. Counts of microflora for iceberg lettuce at 4 and 25°C were determined during a 9-day period. TiO2-UV treatment resulted in 1.2- and 4.3-log increases in the counts of total aerobic bacteria at 4 and 25°C, respectively, compared with 1.3- to 1.6-log and 4.4- to 4.8-log increases due to UV radiation and NaOCl treatments.</P>