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Benchmark Dose Modeling of In Vitro Genotoxicity Data
Xiaoqing Guo,Nan Mei 한국독성학회 2018 Toxicological Research Vol.34 No.4
The methods of applied genetic toxicology are changing from qualitative hazard identification to quantitative risk assessment. Recently, quantitative analysis with point of departure (PoD) metrics and benchmark dose (BMD) modeling have been applied to in vitro genotoxicity data. Two software packages are commonly used for BMD analysis. In previous studies, we performed quantitative dose-response analysis by using the PROAST software to quantitatively evaluate the mutagenicity of four piperidine nitroxides with various substituent groups on the 4-position of the piperidine ring and six cigarette whole smoke solutions (WSSs) prepared by bubbling machinegenerated whole smoke. In the present study, we reanalyzed the obtained genotoxicity data by using the EPA’s BMD software (BMDS) to evaluate the inter-platform quantitative agreement of the estimates of genotoxic potency. We calculated the BMDs for 10%, 50%, and 100% (i.e., a two-fold increase), and 200% increases over the concurrent vehicle controls to achieve better discrimination of the dose-responses, along with their BMDLs (the lower 95% confidence interval of the BMD) and BMDUs (the upper 95% confidence interval of the BMD). The BMD values and rankings estimated in this study by using the EPA’s BMDS were reasonably similar to those calculated in our previous studies by using PROAST. These results indicated that both software packages were suitable for dose-response analysis using the mouse lymphoma assay and that the BMD modeling results from these software packages produced comparable rank orders of the mutagenic potency.
Guo-Liang Wang,Shaohong Qu,Zhengjie Yuan,Yu Zhang,Guojuan Xu,Dongling Bi,Haiyan Qu,Xiaowei Zou,Xiaoqing Gao,Haihe Yang,Haiyan He,Xuli Wang,Jiandong Bao,Shimin Zuo,Xuebiao Pan,Bo Zhou 한국식물학회 2018 Journal of Plant Biology Vol.61 No.3
Rice sheath blight (SB), caused by Rhizoctoniasolani (R. solani), is a major threat to rice productionworldwide. The molecular mechanisms of the SB resistancein rice are poorly understood. The transcriptomes of the SBresistantrice cultivar YSBR1 and the susceptible cultivarLemont were analyzed after R. solani infection. A total of7624 differentially expressed genes (DEGs) were identifiedat one or more timepoints in a cultivar. 5526 and 5618 DEGswere differentially expressed in Lemont and YSBR1,respectively. YSBR1 exhibited stronger and earlier transcriptionalresponse to R. solani than Lemont. Gene ontology enrichmentanalysis revealed that genes that encode cell wall-modifyingand glycosyl-degrading enzymes or anti-microbial proteinswere specifically induced in YSBR1 at 6 hpi. MapMananalysis revealed that more DEGs related with cell wall, β-glucanses, respiratory burst, phenylpropanoids and ligninwere highly induced by R. solani in YSBR1 than in Lemont. The results also showed that receptor-like kinases and jasmonicacid signaling may play important roles in host resistance toR. solani. This study highlights potential candidate genes andsignaling pathways involved in rice sheath resistance and canhelp to further clarify the mechanistic events underlyingresistance and susceptibility to R. solani.
Xiaoqing Lu,Yang Shao,Ke Li,Zigang Zhao,Shuxian Wei,Wenyue Guo 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.5
The intrinsic optoelectronic properties of heteroleptic bipyridyl Cu(I)complexes bearing functionalized acceptor subunits have beeninvestigated by density functional theory and time-dependent DFT. TheCu(I) complexes exhibit distorted trigonal-pyramidal geometries andtypical metal-to-ligand electron transfer characteristics at the longwavelength region. Replacing carboxylic acid with cyanoacrylic acid inacceptor subunits stabilizes the LUMO levels, thus lowering the HOMOLUMOenergy gaps and facilitating favorable donor-to-acceptorintramolecular electron transfer and charge separation. Introduction ofheteroaromatic groups and cyanoacrylic acid significantly improves thelight-harvesting capability of the complexes. Our results highlight theeffect of functionalized acceptors on the optoelectronic properties ofbipyridyl Cu(I) complexes and provide a fresh perspective on screeningof efficient sensitizers for dye-sensitized solar cells.
Wang Xiaoqing,Xiang Yang,Guo Zhiyong,Xia Xuebao,Shi Yuxiao,Xue Peng,Wu Shaowei 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
An experimental method of measuring acoustic surface radiation resistance is developed. The principle of the method is based on obtainingsource velocity and field pressure generated by the source. To measure surface radiation resistance, measuring probe was developedand measuring system was set up. Then, major factors that affect measurement accuracy is discussed and great improvements aregot. After that, experiments of measuring baffled circular piston were conducted to analyze its applicable frequency range. To verifyactual application effect, experiments of measuring the tube and cylinder heads of a diesel engine were performed. The results show thatthis measuring system can obtain resistance values in the frequency range from 460 to 1900 Hz with high precision. The measuring systemhas features of simple operation, convenient use, and high accuracy. Therefore, it can be used to determine surface resistance matrixof various structures.
Peng Guo,Zhaojie Wang,Hongyu Chen,Shaohui Ge,Chen Chen,Haowei Wang,Jinbao Zhang,Minglei Hua,Shuxian Wei,Xiaoqing Lu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01
The increasing energy crisis promotes the study on novel electrode materials with high performance for supercapacitive storage and energy conversion. Transition metal phosphates have been reported as a potential candidate due to the unique coordination and corresponding electronic structure. Herein, we adopted a facile method for preparing NaCoPO4@C derived from a metal organic framework (MOF) as a bifunctional electrode. ZIF-67 was synthesized before a refluxing process with Na2HPO4 to form a precursor, which is transformed into the final product via calcination in different atmospheres. Specifically, the resultant NaCoPO4@C exhibits a high specific capacitance of 1178.7 F g -1 at a current density of 1 A g -1 for a supercapacitor. An asymmetric supercapacitor (ASC) assembled with active carbon displays a high capacitance of 163.7 F g -1 at 1 A g -1. In addition, as an oxygen evolution reaction (OER) catalyst, the NaCoPO4@C electrode requires only 299 mV to drive a current density of 10 mA cm -2. These results suggest that the rational design of MOF-derived NaCoPO4@C provides a variety of practical applications in electrochemical energy conversion and storage.
Caihong Qin,Hui Guo,Pin Liu,Wenwen Bai,Jiayu Huang,Xuemin Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
Toluene abatement through adsorption and then plasma oxidation using ZSM-5, ZSM-5-γ-Al2O3 (Z-Al), ZSM-5-TiO2 (Z-Ti), ZSM-5-BaTiO3 (Z-Ba), and AgMn/ZSM-5-BaTiO3 (AgMn/Z-Ba) as adsorbents/catalysts was investigated. The efficiency of toluene removal reached ∼100% for all the tested adsorbents/catalysts. ZSM-5 had the lowest mineralization rate (MR) of ∼43%, while Z-Ba had the highest MR (88%) with an SCO2 of ∼80%. After loading AgMn onto Z-Ba, both the breakthrough capacity of toluene and SCO2 was increased, while the production of byproduct O3 and MR was decreased. The mixed materials created a higher amount of active species capable of deeply oxidizing adsorbed toluene.
Caihong Qin,Mengke Guo,Yang Zheng,Rui Yu,Jiayu Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Two-component zeolite-alumina packed dielectric barrier discharge plasma was developed to deeplymineralize toluene. Compared with packing ZSM-5 and g-Al2O3 separately in layers, uniform mixing ofZSM-5 and g-Al2O3 was more conducive to the mineralization of adsorbed toluene in nonthermal plasma. When the mixing ratio of ZSM-5 to g-Al2O3 was 1:2, the mineralization rate reached 80% afterdischarging for 120 min. Ag supported on the catalyst surface significantly improved the selectivity ofCO2. Increased relative humidity had little effect on the mineralization of adsorbed toluene, butsignificantly reduced the byproducts O3 and N2O. The adsorption and plasma mineralizationperformance of Ag/ZSM-5-g-Al2O3 duringfive cycles of toluene adsorption was stable with only thepeak concentration of CO showing a slight upward trend. GC–MS, TG, and XPS characterization of freshand used catalysts revealed deactivation of Ag/ZSM-5-g-Al2O3 in terms of CO oxidation due tointermediate organic residues and decreased amounts of Ag+ and lattice oxygen on the support ZSM-5instead of g-Al2O3.
Huie Chen,Haotian Guo,Xiaoqing Yuan,Yating Chen,Chao Sun 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.9
The strength characteristics of unsaturated silty clay after the cooling and single freeze-thawcycle were studied by using Global Digital Systems Ltd. (GDS) triaxial test system aftercontrolling initial matric suction. The results demonstrate that, the initial matrix suction andfreezing process can strengthen the shear strength of the soil, which makes the stress-straincurve of the soil show certain strain hardening characteristics at different temperatures. whenthe temperature is negative (including 0°C), the curve has a flat transition section whosestrength does not change with deformation, and the flat transition section becomes shorter asthe temperature and confining pressure decrease. The strength of the soil at negativetemperature and the speed at which it reaches its peak value are much greater than those ofthe soil after positive temperature and single freeze-thaw cycle, and the contribution ofconfining pressure to the strength decreases with the decrease of temperature. The effect oftemperature change (15oC to -15oC) on soil strength is mainly reflected in the total cohesion,and the effect of freeze-thaw on the effective internal friction angle is more significant. Thestrength and deformation characteristics of soil under the freezing process and freeze-thawcycle are determined by the initial matric suction, the form of connection between soilparticles, the migration of unfrozen water, and the degree of water-ice phase transformation.