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Phenol biosensor based on hydrogel microarrays entrapping tyrosinase and quantum dots
Jang, Eunji,Son, Kyung Jin,Kim, Bumsang,Koh, Won-Gun Royal Society of Chemistry 2010 The Analyst Vol.135 No.11
<P>This paper describes the use of microarray-based biosensor system for the determination of phenol. Microarrays based on poly(ethylene glycol)(PEG) hydrogel were prepared by photopatterning of a solution containing PEG diacrylate (PEG-DA), photoinitiator, tyrosinase, and CdSe/ZnS quantum dots (QDs). During photo-induced crosslinking, tyrosinase and QDs were entrapped within the hydrogel microarrays, making the hydrogel microarray fluorescent and responsive to phenol. The entrapped tyrosinase could carry out enzyme-catalyzed oxidation of phenol to produce quinones, which subsequently quenched the fluorescence of QDs within hydrogel microarray. The fluorescence intensity of the hydrogel microarrays decreased linearly according to phenol concentration and the detection limit of this system was found to be 1.0 μM. The microarray system presented in this study could be combined with a microfluidic device as an initial step to create a phenol-detecting “micro-total-analysis-system (μ-TAS)”.</P> <P>Graphic Abstract</P><P>Detection of phenol using PEG hydrogel microarrays entrapping quantum dots (QDs) and tyrosinase based on the mechanism that QD fluorescence intensity is quenched by quinone intermediates produced from the tyrosinase-catalyzed oxidation of phenolic compounds. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0an00353k'> </P>
Time Resolved Infrared Spectroscopy of Electro-optic Switching of 5CB
Jang, Won-Gun The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.1
Time resolved infrared IR absorption spectroscopy is carried out to investigate the dynamics of electric field induced reorientation of the biphenyl molecular core and alkyl tail sub-fragments of the nematic liquid crystal 5CB (4-pentyl-4-cyano-biphenyl). The planar to homeotropic transition for high pre-tilt planar aligned cells, is studied for switching times ranging from 200 ${\mu}sec$ down to 80 ${\mu}sec$, the latter a factor of 1000 times faster than any previous nematic IR study. The reorientation rates of the core and tail are found to be the same to within experimental error and scale inversely with applied field squared, as expected for the balance of field and viscous torques. Thus any molecular conformation change during switching must relax on a shorter time scale. A simple model shows that no substantial differences exist between the reorientational dynamics of the tails and cores on the time scales longer than on the order of 10 ${\mu}s$.
Water Saving by Shallow Intermittent Irrigation and Growth of Rice
Gun Won, Jong,Soo Choi, Jang,Phil Lee, Seung,Ho Son, Seung,Ok Chung, Sang The Crop Science Society of Japan 2005 Plant production science Vol.8 No.4
<P>To reduce water requirement and improve water productivity (the grain yield per unit volume of water irrigated) by water-saving irrigation techniques, we examined the effects of very shallow intermittent irrigation (VSII, 2cm), shallow intermittent irrigation (SII, 4cm) and traditional deep water irrigation (DWI, 10cm) on rice growth and yield in the field for two years. The amount of water irrigation during the rice-growing period (average of two years) was 318, 391 and 469 mm in VSII, SII and DWI, respectively. Rice growth and grain yield were not significantly influenced by the treatments. As the irrigation water input decreased, the water productivity increased. The water productivity increased by 46 % in VSII and 20 % in SII on the average as compared with DWI. The shallower the irrigation depth, the lower the breaking weight and the higher the lodging resistance, and the deeper the roots in the paddy soil. In DWI, the percentage of head rice was lower and the protein content was higher, suggesting deterioration in the palatability of cooked rice due to the increase of chalky rice. The water-saving rate was 32.9 % in VSII and 17.2 % in SII as compared with typical deep water irrigation in Korea.</P>
Morphological Difference of Rice Seedling Grown under Different Dissolved Oxygen Conditions
Won Jong Gun,Choi Jang Soo,Ahn Deck Jong,Lee Seung Phil,Lee Sang Chul,Yoshida Tomohiko The Korean Society of Crop Science 2004 Korean journal of crop science Vol.49 No.4
The response of dissolved oxygen (DO) concentrations caused significant change in root number, root length, coleoptile length, shoot length and leaf age of seedlings. The genotypic difference in the effect of DO also highly significant (P<0.01) for all of the seedling traits. The number and length of root were extremely inhibited at the condition of $0.39\pm0.09$ DO concentration. While the coleoptile elongated markedly in the lowest DO concentrations, the shoot did not develop. The root growth was improved slightly at the $1.39\pm0.27mg L^{-1}$, however, there were no difference among genotypes at these two low DO concentrations. As the DO concentration become higher, the growth of root and shoot was improved remarkably. Root number, root length and shoot length was significantly different between $20\;and\;30^{\circ}C$ in DO rich and normal conditions, the development of those traits were apparently accelerated in high water temperature, however those traits of seedlings in DO deficiency were not different between the two temperatures except for shoot length. On the other hand the coleoptile length was not affected by the stagnant water temperature; it was stimulated by the low DO concentration. The competition of DO was greater as the seedling density was increased in the stagnant water, therefore the seedlings grown under high density have long and white coleoptiles, and the growth of roots and shoots was retarded severely.
( Gun Woo Koo ),( Sung Jun Chung ),( Joo Hee Kwak ),( Chang Kyo Oh ),( Dong Won Park ),( Hyeon Jung Kwak ),( Ji Yong Moon ),( Sang Heon Kim ),( Jang Won Sohn ),( Ho Joo Yoon ),( Dong Ho Shin ),( Sung 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Desmoid tumors are rare soft tissue tumors considered to have locally infiltrative features without distant metastasis until now. Although they are most commonly intraabdominal, very few cases have extra-abdominal locations. The origin of intrathoracic desmoid tumors is predominantly the chest wall with occasional involvement of pleura. True intrathoracic primary desmoid tumors with no involvement of the chest wall or pleura are extremely rare. We recently experienced a case of true intrathoracic desmoid tumor presenting as multiple lung nodules at 13 years after resection of a previous intraabdominal desmoid tumor.
Infrared Spectroscopic Study of Molecular Hydrogen Bonding in Chiral Smetic Liquid Crystal
Jang, Won-Gun The Korean Infomation Display Society 2001 Journal of information display Vol.2 No.3
We utilize Fourier transform infrared (IR) spectroscopy to probe intramolecular hydrogen bonding in $smectic-C^{\ast}$ liquid crystal phases. Infrared spectra of aligned smectic liquid crystal materials vs. temperature and of isotropic liquid crystal mixtures vs. concentration were measured in homologs, both with and without hydrogen bonding. Hydrogen bonding significantly changes the direction and magnitude of the vibrational dipole transition moments, causing marked changes in the IR dichroic absorbance profiles of hydrogen bonded molecular subfragments. A GAUSSIAN94 computation of the directions, magnitudes, and frequencies of the vibrational dipole moments of molecular subfragments shows good agreement with the experimental data. The results show that IR dichroism can be an effective probe of hydrogen bonding in liquid crystal phases.
The Applicability of Cathode Ray Tube Recycling for Aggregates of Cement and Clay Bricks
( Jang-soo Lee ),( Heung-min Yoo ),( Won-seok Yang ),( Se-won Park ),( Sang-yeop Lee ),( Eun-song Lee ),( Gun-ho Han ),( Yong-chil Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Consumer spending on electronic products is changing with economic growth and technological advances. Until the early 2000s, most of the monitors contained Cathode ray tube(CRT). However, in the 2010s, the CRT monitor was no longer used, as the display unit changed to LED and OLED lights. Therefore, it is expected that CRT monitors will continue to emit large quantities in a short period of time. The existing method of recycling CRT glass is closed roof, which is a method of recycling CRT glass back into CRT glass, but now it has no meaning to produce CRT monitors, the open roof method, which is a method that uses CRT glass as a material for other products. CRT glass consists of panel and funnel, the front and the back are different. Therefore, Different recycling methods should be considered. In this study, the possibility of recycling was assessed based on flexural strength, compressive strength, absorption rate, and dimensions by using concrete aggregates and clay bricks, which are methods for recycling the panel of CRT glass for high volume and stability. Concrete blocks can be replaced by 20 to 30 percent, and clay bricks can be replaced with about 2 percent of raw materials.
Won-Sik Oh,Daeyoun Cho,Kyu-Min Cho,Gun-Woo Moon,Byungchoon Yang,Taeseok Jang IEEE 2009 Journal of display technology Vol.5 No.1
<P>In this paper, a novel two-dimensional (2-D) adaptive dimming technique with X-Y channels for light-emitting diode (LED) backlight system in LCD TVs is proposed. The proposed LED backlight has matrix-structured LED modules with row and column switches to control the brightness of individual division block. It shows local dimming effects such as reduced power consumption and high dynamic contrast ratio even with much less number of LED drivers than that of the conventional 2-D local dimming method. Therefore, low cost and compact design of LED drivers can be achieved. This paper also contains a new adaptive dimming algorithm and image manipulation technique for the proposed LED backlight system. The proposed dimming technique is verified by simulation and experimental results based on a RGB-LED backlight of a 32-in LCD TV.</P>
( Won Ku Lee ),( Kyoungjune Pak ),( Seong Jang Kim ),( Junhee Han ),( Jeong Min Kim ),( Gun Wook Kim ),( Margaret Song ),( Hoon Soo Kim ),( Hyun Chang Ko ),( Moon Bum Kim ),( Byung Soo Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2
Background: There is increasing awareness that psoriasis is a systemic, immune-mediated inflammatory disease including skin and joint. Objectives: To detect and quantify systemic and vascular inflammation in patients with moderate to severe psoriasis using [18F]-fluorodeoxyglucose positron emission tomography- computed tomography (18FDG PET/CT). Furthermore, to investigate the relationship between PASI score and FDG uptake in the liver, spleen and aorta. Methods: Case series with a nested case-control study was done. Twenty seven patients with moderate to severe psoriasis and twenty five controls age and sex matched underwent 18FDG PET/CT. FDG uptakes in the liver, spleen and 5 segments of aorta were evaluated by calculating the maximum standardized uptake value (SUVmax). Results: 18FDG PET/CT of patients with moderate to severe psoriasis demonstrated increased FDG uptakes in the liver and spleen compared with the controls. There were increased FDG uptakes in the liver, spleen and all segments of aorta with psoriasis group of high PASI score compared to the group with low PASI score. Conclusion: This study shows that systemic inflammation is increased in psoriasis patients compared to the controls, and there is correlation between psoriasis severity and systemic and vascular inflammation. We also suggest that 18FDG PET/CT can be used to identify systemic and vascular inflammation in psoriasis patients.