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Lee, Chul-Soon,Dai, Zhengfei,Kim, Do Hong,Li, Hua-Yao,Jo, Young-Moo,Kim, Bo-Young,Byun, Hyung-Gi,Hwang, Insung,Lee, Jong-Heun Elsevier 2018 Sensors and actuators. B Chemical Vol.273 No.-
<P><B>Abstract</B></P> <P>The lack of gas selectivity in oxide semiconductor chemiresistors has long been an obstacle to realizing discriminative detection of indoor volatile organic compounds (VOCs) with different health impacts. A simple and reliable algorithm to discriminate between critically harmful aromatic VOCs (benzene, xylene, and toluene) and less harmful ethanol is suggested by the simple combination of sensor signals from pure In<SUB>2</SUB>O<SUB>3</SUB> and Au-loaded In<SUB>2</SUB>O<SUB>3</SUB> 2D inverse opal (IO) thin films prepared by heat-treating the precursor-dipped self-assembled polystyrene templates and Au deposition. The Au-loaded In<SUB>2</SUB>O<SUB>3</SUB> IO sensor showed unprecedentedly high responses to 5 ppm ethanol (resistance ratio = 1640.2) and comparably high responses to 5 ppm benzene, <I>p-</I>xylene, and toluene (resistance ratio range of 674.5–1012.9). Such high gas responses were attributed to the periodically porous and thus highly gas-accessible structures, while the clear discrimination between aromatic VOCs and ethanol was achieved by tuning gas selectivity through systematic control of the size, morphology, and loading concentration of Au nano-catalysts. The results of this study can be used for reliable and precise monitoring of indoor air pollutants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Discriminative detection of indoor pollutant gases using Au-In<SUB>2</SUB>O<SUB>3</SUB> 2D Inverse Opals. </LI> <LI> Selective and sensitive detection of ethanol using In<SUB>2</SUB>O<SUB>3</SUB> 2D Inverse Opals. </LI> <LI> Ultrahigh response (resistance ratio = ∼1000) of Au-In<SUB>2</SUB>O<SUB>3</SUB> sensor to 5 ppm <I>p</I>-xylene. </LI> <LI> A simple and reliable algorithm for gas selectivity using two-sensor array. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Visible light assisted NO<sub>2</sub> sensing at room temperature by CdS nanoflake array
Li, Hua-Yao,Yoon, Ji-Won,Lee, Chul-Soon,Lim, Kyeorei,Yoon, Ji-Wook,Lee, Jong-Heun Elsevier 2018 Sensors and actuators. B, Chemical Vol.255 No.3
<P><B>Abstract</B></P> <P>A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO<SUB>2</SUB>) under green LED illumination (wavelength 500–540nm, irradiance 21W/m<SUP>2</SUP>) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdS NO<SUB>2</SUB> gas sensor operated under both fluorescent lamp and natural solar light. </LI> <LI> 2D nanoflake array CdS films for enhanced light absorption and charge transport. </LI> <LI> CdS gas sensor with high response to NO<SUB>2</SUB>, little influence by humidity. </LI> <LI> Elucidation of visible-light-enhanced NO<SUB>2</SUB> sensing mechanism. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Chul-Soon,Li, Hua-Yao,Kim, Bo-Young,Jo, Young-Moo,Byun, Hyung-Gi,Hwang, In-Sung,Abdel-Hady, Faissal,Wazzan, Abdulaziz A.,Lee, Jong-Heun Elsevier 2019 Sensors and actuators. B Chemical Vol.285 No.-
<P><B>Abstract</B></P> <P>Representative indoor volatile organic compounds (VOCs) such as benzene, xylene, toluene, formaldehyde, and ethanol need to be detected in a highly sensitive and discriminative manner because of their different impact on human health. In this study, pure and 0.05, 0.1, 0.3, and 0.5 at% Fe-doped In<SUB>2</SUB>O<SUB>3</SUB> nanofibers were prepared by electrospinning and their gas sensing characteristics toward the aforementioned VOCs were investigated. The doping of In<SUB>2</SUB>O<SUB>3</SUB> nanofiber sensor with 0.05 and 0.1 at% Fe shifted the temperature to show the maximum responses to benzene, xylene, and toluene, and reduced responses to ethanol and formaldehyde, thus demonstrating changed gas selectivity. The gas sensing characteristics of 0.5 at% Fe-doped In<SUB>2</SUB>O<SUB>3</SUB> nanofiber sensor were substantially different from those of the other sensors. Significantly different gas sensing patterns of pure and Fe-doped In<SUB>2</SUB>O<SUB>3</SUB> sensors could be used to discriminate between the five different VOCs at 375 °C and to distinguish between the aromatic and non-aromatic gases at all sensing temperatures. The mechanism underlying the Fe-induced change in gas sensing characteristics has been discussed in relation to the variation of catalytic activity, morphology, oxygen adsorption, and charge carrier concentration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of a sensor array using pure and Fe-doped In<SUB>2</SUB>O<SUB>3</SUB> nanofibers. </LI> <LI> Discriminative detection of benzene, xylene, toluene, ethanol, and formaldehyde. </LI> <LI> Distinction between aromatic and non-aromatic indoor pollutants using sensor array. </LI> <LI> Gas sensing mechanism underlying Fe-induced change in response and selectivity. </LI> </UL> </P>
Li, Hua-Yao,Lee, Chul-Soon,Kim, Do Hong,Lee, Jong-Heun American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.33
<P>Ammonia (NH<SUB>3</SUB>) is an irritant gas with a unique pungent odor; sub-parts per million-level breath ammonia is a medical biomarker for kidney disorders and <I>Helicobacter pylori</I> bacteria-induced stomach infections. The humidity varies in both ambient environment and exhaled breath, and thus humidity dependence of gas-sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room-temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nanoscale moisture-blocking CeO<SUB>2</SUB> overlayer by electron-beam evaporation. CuBr sensors coated with a 100 nm-thick CeO<SUB>2</SUB> overlayer exhibits an ultrahigh response (resistance ratio) of 68 toward 5 ppm ammonia with excellent gas selectivity, rapid response, reversibility, and humidity-independent sensing characteristics at room temperature. In addition, the sensing performance remains stable after repetitive bending and long-term operation. Moreover, the sensors exhibit significant response to the simulated exhaled breath of patients with <I>H. pylori</I> infection; the simulated breath contains 50 ppb NH<SUB>3</SUB>. The sensors thus show promising potential in detecting sub-parts per million-level NH<SUB>3</SUB>, regardless of humidity fluctuations, which can open up new applications in wearable devices for in situ medical diagnosis and indoor/outdoor environment monitoring.</P> [FIG OMISSION]</BR>
A New Abietane Diterpenoid from Isodon inflexus
Lee, Chul,Hong, Seong-Su,Han, Xiang Hua,Jin, Qinghao,Li, Dayu,Kim, Tae-Ook,Kim, Hyun-Kyu,Lee, Jeong-Rai,Kwon, Suk-Hyung,Kim, Yun-Bae,Lee, Mi-Kyeong,Hwang, Bang-Yeon 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
A new ent-abietane diterpenoid, $3{\alpha}$, $6{\beta}$-dihydroxy-7,17-dioxo-ent-abieta-15(16)-ene (1), and three known ent-kaurane diterpenids, kamebacetal A (2), kamebakaurin (3), and excisanin A (4), and a known triter-penoid, ursolic acid (5), were isolated from the aerial parts of Isodon inflexus. Their chemical structures were determined by extensive analysis of spectroscopic data including 1D- and 2D-NMR experiments. All isolates (1-5) were evaluated for their potential to inhibit LPS-induced nitric oxide production in RAW264.7 cells. Of these, compounds 1-4 inhibited the production of NO with $IC_{50}$ values ranging from 1.0 to $26.5{\mu}M$.
Citricoccus alkalitolerans sp. nov., a novel actinobacterium isolated from a desert soil in Egypt
Li, Wen-Jun,Chen, Hua-Hong,Zhang, Yu-Qin,Kim, Chang-Jin,Park, Dong-Jin,Lee, Jae-Chan,Xu, Li-Hua,Jiang, Cheng-Lin Microbiology Society 2005 International journal of systematic and evolutiona Vol.55 No.1
<P>An actinobacterium, strain YIM 70010<SUP>T</SUP>, which was isolated from a desert soil sample collected in Egypt, was subjected to a polyphasic taxonomy study. The organism was alkalitolerant and its optimum growth occurred at pH 8·0-9·0. The isolate contained chemotaxonomic markers that were characteristic of the genus <I>Citricoccus</I>, i.e. the peptidoglycan type Lys-Gly-Glu (variation A4<I>α</I>), the predominant menaquinone MK-9(H2) and a polar lipid profile consisting of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unknown glycolipids. The major fatty acids were anteiso-C15 : 0 and iso-C15 : 0. The G+C content of the genomic DNA was 63·8 mol%. Strain YIM 70010<SUP>T</SUP> exhibited a 16S rRNA gene sequence similarity of 99·6 % and DNA-DNA relatedness value of 56 % with <I>Citricoccus muralis</I> DSM 14442<SUP>T</SUP>. The phenotypic characteristics and DNA-DNA relatedness data indicate that strain YIM 70010<SUP>T</SUP> can be distinguished from <I>C. muralis</I> (DSM 14442<SUP>T</SUP>). Therefore, on the basis of the polyphasic taxonomic data presented, a novel species of the genus <I>Citricoccus</I>, <I>Citricoccus alkalitolerans</I> sp. nov. (type strain, YIM 70010<SUP>T</SUP>=CCTCC AA 203008<SUP>T</SUP>=DSM 15665<SUP>T</SUP>=KCTC 19012<SUP>T</SUP>) is proposed.</P>
Li, Wen-Jun,Kroppenstedt, Reiner M.,Wang, Dong,Tang, Shu-Kun,Lee, Jae-Chan,Park, Dong-Jin,Kim, Chang-Jin,Xu, Li-Hua,Jiang, Cheng-Lin Microbiology Society 2006 International journal of systematic and evolutiona Vol.56 No.5
<P>Five novel Nocardiopsis strains isolated from hypersaline soils in China were subjected to a polyphasic analysis to determine their taxonomic position. All of the novel isolates could grow on agar plates at NaCl concentrations of up to 18 % (w/v), with optimum growth at 5-8 %. The DNA G+C contents of the novel strains ranged from 67.9 to 73.2 mol%. The morphological and chemotaxonomic characteristics of the isolates matched those described for members of the genus Nocardiopsis. Based on their 16S rRNA gene sequence analysis, DNA-DNA hybridization values and phenotypic characteristics, including the composition of cell-wall amino acids and sugars, menaquinones, polar lipids and cellular fatty acids, the isolates are proposed as representing five novel species of the genus Nocardiopsis. The novel species are proposed as Nocardiopsis gilva sp. nov. [type strain YIM 90087T (=KCTC 19006T=CCTCC AA 2040012T=DSM 44841T)], Nocardiopsis rosea sp. nov. [type strain YIM 90094T (=KCTC 19007T=CCTCC AA 2040013T=DSM 44842T), Nocardiopsis rhodophaea sp. nov. [type strain YIM 90096T (=KCTC 19049T=CCTCC AA 2040014T=DSM 44843T), Nocardiopsis chromatogenes sp. nov. [type strain YIM 90109T (=KCTC 19008T=CCTCC AA 2040015T=DSM 44844T) and Nocardiopsis baichengensis sp. nov. [type strain YIM 90130T (=KCTC 19009T=CCTCC AA 2040016T=DSM 44845T). On the basis of the chemotaxonomic data, the description of the recently described species Nocardiopsis salina Li et al. 2004 is emended.</P>