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RISS 인기검색어
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- 저자 : Haiying Yu (검색결과 3 건)
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A Comparison of Eu-Doped -Fe2O3 Nanotubes and Nanowires for Acetone Sensing
Yali Cheng,Yifang Wang,Jinbao Zhang,Haiying Li,Li Liu,Yu Lina,Liting Du,Haojie Duan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
Pure and Eu-doped (1.0, 3.0, 5.0 wt.%) α-Fe2O3 (PFO and EFO) nanotubes and nanowires have been successfully synthesized through the combination of electrospinning and calcination techniques. The structures, morphologies and chemical compositions of the as-obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential scanning calorimetry (TG-DSC) and energy dispersive spectrum (EDS), respectively. To demonstrate the superior gas sensing performance of the doped nanotubes, a contrastive gas sensing study between PFO (EFO) nanotubes and nanowires was performed. It turned out that Eu doping could magnify the impact of morphology on gas sensitivity. Specifically, at the optimum operating temperature of 240 ℃, the response value of PFO nanotubes to 100 ppm acetone is slightly higher than that of nanowires (3.59/2.20). EFO (3.0 wt.%) nanotubes have a response of 84.05, which is almost 2.7 times as high as that of nanowires (31.54). Moreover, they possess more rapid response/recovery time (11 s and 36 s, respectively) than nanowires (17 s and 40 s, respectively). The lowest detection limit for acetone is 0.1 ppm and its response is 2.15. In addition, both of EFO nanotubes and nanowires sensors have a good linearity (0.1–500 ppm) and favorable selectivity in acetone detection.
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Lei Zhang,Linlin Wang,Faqinwei Li,Fei Xiao,Haiye Yu 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.2
Artemisia princeps (Ganghwa wormwood) is a medicinal plant that produces two major fl avonoids, eupatilin and jaceosidin, which are used in the treatment of gastritis and peptic ulcers. A. princeps is primarily fi eld cultivated, which has some drawbacks, including only one cultivation period per year and variations in fl avonoid production due to environmental changes. The objective of this study was to analyze the eff ects of seasonal light variation and artifi cial light treatments on the growth and fl avonoid production of A. princeps grown in greenhouses for year-round production. The plants were cultivated and harvested nine times in one year under natural seasonal light conditions in greenhouses. During the winter growth period (when natural light is substantially lower), four artifi cial light treatments were applied during two cultivation periods, from September 2016 to January 2017: supplemental light, night interruption, low light, and low light with night interruption. The plants grown under the natural light condition in greenhouses were used as a control. After harvest, the growth of the plants was measured, and the contents of eupatilin and jaceosidin were determined. The plants had the highest biomass when the accumulated radiation and duration were highest. The growth and fl avonoid production were signifi cantly associated with accumulated radiation and light duration. The supplemental light and night interruption treatments resulted in signifi cantly higher biomass and fl avonoid production, with the night interruption treatment requiring less energy input than the supplemental light treatment. Therefore, for consistent biomass and fl avonoid production of A. princeps , a night interruption treatment is suggested in greenhouse cultivation during low irradiation and short days (less than 13 h).
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Characterization of Newcastle disease virus obtained from toco toucan
Jiaxin Li,Mengmeng Ling,Yixue Sun,Haiyang Di,Yulin Cong,Haiying Yu,Yanlong Cong 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.2
Given that the current Newcastle disease virus (NDV) infection in wild birds poses the threat to poultry, surveillance of Newcastle disease in captive wild birds was carried out in Jilin, China in 2018. Here, an NDV strain obtained from toco toucan was firstly characterized. The results showed that the F gene of the NDV isolate Toucan/China/3/2018 is classified as genotype II in class II. Sequence analysis of the F0 cleavage site was 113RQGR/L117, which supports the result of the intracerebral pathogenicity index assay indicating classification of the isolate as low-pathogenicity. Experimental infection demonstrated that Toucan/China/3/2018 can effectively replicate and transmit among chickens. To our knowledge, this is the first report on genetically and pathogenically characterizing NDV strain isolated from toucan, which enriches the epidemiological information of NDV in wild birds.
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