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The Visible Human Projects in Korea and China with improved images and diverse applications.
Dai, Jing-Xing,Chung, Min Suk,Qu, Rong-Mei,Yuan, Lin,Liu, Shu-Wei,Shin, Dong Sun Springer International 2012 Surgical and radiologic anatomy Vol.34 No.6
<P>The Visible Human Projects, which were launched in the United States, have also been developed in Korea and China during the past decade. This article includes the new trials to promote a variety of their applications.</P>
( Jing Yi ),( Bin Dong ),( Yong Gang Xue ),( Ning Li ),( Peng Gao ),( Yu Xin Zhao ),( Ling Ling Dai ),( Xiao Hu Dai ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.2
Microbial community shifts, associated with performance data, were investigated in an anaerobic batch digester treating high-solid food waste under mesophilic conditions using, a combination of molecular techniques and chemical analysis methods. The batch process was successfully operated with an organic removal efficiency of 44.5% associated with a biogas yield of 0.82 L/g VSremoval. Microbial community structures were examined by denaturing gel gradient electrophoresis. Clostridium and Symbiobacterium organisms were suggested to be mainly responsible for the organic matter catabolism in hydrolysis and acidogenesis reactions. The dynamics of archaeal and methanogenic populations were monitored using real-time PCR targeting 16S rRNA genes. Methanosarcina was the predominant methanogen, suggesting that the methanogenesis took place mainly via an aceticlastic pathway. Hydrogenotrophic methanogens were also supported in high-solid anaerobic digestion of food waste through syntrophism with syntrophic bacterium. Microbial community shifts showed good agreement with the performance parameters in anaerobic digestion, implying the possibility of diagnosing a high-solid anaerobic digestion process by monitoring microbial community shifts. On the other hand, the batch results could be relevant to the start-up period of a continuous system and could also provide useful information to set up a continuous operation.
Preparation and stability of fucoxanthin-loaded microemulsions
Jing Dai,김상무,신일식,김종대,이현용,신원철,김진철 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Oil-in-water microemulsions (MEs) containing fucoxanthin were prepared. The stability of MEs stored at 4℃ was investigated for 4 weeks in terms of droplet size change and phase separation. The ME having the oil content of 2% was stable throughout the experiment. As the oil content increased to 3% and 4%, the sizes increased with time for the last 3 weeks. Further increase to 5% led to the phase separation at the 4th week. About 95% of fucoxanthin was maintained for 4 weeks once no phase separation took place soon after the preparation.
Charting Microbial Phenotypes in Multiplex Nanoliter Batch Bioreactors
Dai, Jing,Yoon, Sung Ho,Sim, Hye Young,Yang, Yoon Sun,Oh, Tae Kwang,Kim, Jihyun F.,Hong, Jong Wook American Chemical Society 2013 ANALYTICAL CHEMISTRY - Vol.85 No.12
<P>High-throughput growth phenotyping is receiving great attention for establishing the genotype–phenotype map of sequenced organisms owing to the ready availability of complete genome sequences. To date, microbial growth phenotypes have been investigated mostly by the conventional method of batch cultivation using test tubes, Erlenmeyer flasks, or the recently available microwell plates. However, the current batch cultivation methods are time- and labor-intensive and often fail to consider sophisticated environmental changes. The implementation of batch cultures at the nanoliter scale has been difficult because of the quick evaporation of the culture medium inside the reactors. Here, we report a microfluidic system that allows independent cell cultures in evaporation-free multiplex nanoliter reactors under different culture conditions to assess the behavior of cells. The design allows three experimental replicates for each of eight culture environments in a single run. We demonstrate the versatility of the device by performing growth curve experiments with <I>Escherichia coli</I> and microbiological assays of antibiotics against the opportunistic pathogen <I>Pseudomonas aeruginosa</I>. Our study highlights that the microfluidic system can effectively replace the traditional batch culture methods with nanoliter volumes of bacterial cultivations, and it may be therefore promising for high-throughput growth phenotyping as well as for single-cell analyses.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2013/ancham.2013.85.issue-12/ac400648z/production/images/medium/ac-2013-00648z_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac400648z'>ACS Electronic Supporting Info</A></P>
Analysis of Signal Integrity for High Precision Digital-to-Analog Conversion Circuit
Jing Dai,Yanmei Wang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5
In order to improve the accuracy of the digital to analog conversion (DAC), the reflection and crosstalk problems of the signal transmission process were studied in this paper. The Hyperlynx software was used for the simulation study of reflection and crosstalk problems of the master clock signal in the DAC circuit. Source end cascading termination resistor and remote end termination resistor and capacitor (RC) methods were adopted to weaken the reflected signal. The problem of signal crosstalk was solved by the remote end cascading termination resistor method. The experiments results showed that the reflection peak could be eliminated when the value of the source end cascading termination resistor was 100Ω. The reflection peak could be eliminated when the value of remote end termination resistors was 100Ω and the capacitance was 300pF. Terminating 100Ω resistor, shortening the length of the transmission line and decreasing the distance of the adjacent network could weaken crosstalk phenomenon. In high precision digital to analog conversion circuit, the source end cascading termination resistor and the remote RC termination were adopted to solve the problems of signal reflection. The methods of optimizing wiring and the cascading termination resistor weakened the signal crosstalk phenomenon. They also improved signal integrity and ADC accuracy of the signal during transmission.
Effect of photo-dimerization of coumarins on their interaction with polymeric β-cyclodextrin
Jing Dai,Jin Chul Kim 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.3
Coumarin and 7-hydroxycoumarin (7HC) were photo-dimerized in an aqueous solution of polymeric β-cyclodextrin (PβCD) to investigate the effect of the photo-dimerization on the viscosity of PβCD solution. PβCD was prepared by cross-linking β-cyclodextrin (βCD) using epichlorohydrin. The content of βCD residues in PβCD, determined by a colorimetric method using phenolphthalein as an indicator, was 28.8 wt%. The solubility of coumarin increased with increasing concentration of PβCD, because the benzene ring of coumarin was included in the hydrophobic cavity of βCD residue. PβCD also increased the solubility of 7HC, but the solubilizing effect on 7HC was much less than that on coumarin, possibly because the hydroxy group on the benzene ring was likely to suppress the inclusion in the cavity of βCD. And, the photo-dimerization degree of 7HC in an aqueous solution of PβCD was about half than that of coumarin, possibly because the vinyl ether of pyrone group of 7HC could be concealed in the cavity of βCD. The photo-dimerization of coumarin in an aqueous solution of PβCD could significantly increase the viscosity of the solution. One coumarin dimer would hydrophobically interact with two βCD residues so it can act as a cross-linker for PβCD.
In vivo anti-obesity efficacy of fucoxanthin-loaded emulsions stabilized with phospholipid
Jing Dai,김진철 한국약제학회 2016 Journal of Pharmaceutical Investigation Vol.46 No.7
Fucoxanthin-loaded oil-in-water emulsions (FLEs) were prepared using medium chain triglyceride as an oil phase and L-a-phosphatidylcholine as an emulsifier. The stability of FLEs stored under dark condition at 25 C was investigated for 15 days in terms of droplet size change and fucoxanthin deterioration. The size of oil droplets on optical microscopic photos was about 3 lm immediately after preparation. And it increased to about 16 lm 15 days after preparation. The fucoxanthin content in FLEs was almost 90 % of its initial content soon after preparation, and it decreased to 75 % 15 days after preparation. The in vivo antiobesity efficacy of FLEs was investigated by applying the emulsion daily on the back of rat for 30 days and measuring the body weight, the liver weight and the leptin concentration in the blood of the rats. FLEs—treated rats showed lower body weight and liver weight 30 days after the application than FLEs—untreated rats did. And the leptin concentration in the blood markedly decreased upon the application of FLEs.