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- 저자 : Xiaonan Guo (검색결과 5 건)
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GROWTH AND MICROSTRUCTURES OF ULTRATHIN Bi 2 Te 3 NANOPLATES BY MODIFIED HOT WALL EPITAXY
JIANHUA GUO,HUIYONG DENG,YUCONG LIU,GUJIN HU,XIAONAN LI,GUOLIN YU,NING DAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Ultrathin Bi 2 Te 3 nanoplates have been grown on an oxidized silicon substrate by a modi¯ed hotwall epitaxy (HWE) method, in which a quartz plate with holes was employed. The micro-structures and optical properties of Bi 2 Te 3 nanoplates were investigated by X-ray di®raction(XRD), scanning electron microscopy (SEM), atomic force microscope (AFM) and micro-Ramanspectroscopy. The results show that ultrathin Bi 2 Te 3 nanoplates with the thickness of about sixquintuple layers (QLs) are obtained, which is di±cult for the traditional HWE technique. TheRaman vibration mode A11gfrom the nanoplates exhibits an obviously red shift with decreasingthickness. The thickness variation of one nanoplate was obtained by the Raman map derivedfrom the vibration frequency of A11gmode and is in good agreement with the AFM result, whichindicates that Raman map is an e®ective method to characterize the thickness di®erence ofultrathin Bi 2 Te 3 nanoplates.
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Yang Zhao,Liang Zhao,Xiaonan Zheng,Tianjiao Fu,Huiyuan Guo,Fazheng Ren 한국미생물학회 2013 The journal of microbiology Vol.51 No.2
In this study, we utilized the nematode Caenorhabditis elegans to assess potential life-expanding effect of Lactobacillus salivarius strain FDB89 (FDB89) isolated from feces of centenarians in Bama County (Guangxi, China). This study showed that feeding FDB89 extended the mean life span in C. elegans by up to 11.9% compared to that of control nematodes. The reduced reproductive capacities, pharyngeal pumping rate, growth, and increased superoxide dismutase (SOD)activity and XTT reduction capacity were also observed in FDB89 feeding worms. To probe the anti-aging mechanism further, we incorporated a food gradient feeding assay and assayed the life span of eat-2 mutant. The results demonstrated that the maximal life span of C. elegans fed on FDB89was achieved at the concentration of 1.0 mg bacterial cells/plate, which was 10-fold greater than that of C. elegans fed on E. coli OP50 (0.1 mg bacterial cells/plate). However, feeding FDB89 could not further extend the life span of eat-2mutant. These results indicated that FDB89 modulated the longevity of C. elegans in a dietary restriction-dependent manner and expanded the understanding of anti-aging effect of probiotics.
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Yongan Yang,Yuangang Wei,Xiaonan Guo,Pengfei Qi,Hailiang Zhu,Wenjian Tang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
Glycyrrhetic acid monoglucuronide (GAM) isobtained from the natural sweetener glycyrrhizin throughenzymolysis. Its sweetness concentration–response (C–R)behavior in room-temperature in water was determinedusing two-alternative forced choice discrimination tests. The C–R equation of resultant hyperbolic curve relatingsucrose equivalent (SE, %) to GAM concentration([GAM], mg/L) was SE = 19.6 9 [GAM]/(194.8 ? [GAM]). From the C–R function, Pw (2) ofGAM, relative to a 2% (w/v) sucrose reference, is morethan 900, which has much higher potency than its precursorglycyrrhizin. Molecular modeling showed that GAM isfinely bound into protein 1EWK through conventionalhydrogen bonds, p-Alkyl interactions and Van der Waalsbonds, which exhibited better protein inclusion than Glycyrrhizin. Thus, GAM could be developed
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Cross-Technology Localization: Leveraging Commodity WiFi to Localize Non-WiFi Device
( Dian Zhang ),( Rujun Zhang ),( Haizhou Guo ),( Peng Xiang ),( Xiaonan Guo ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.11
Radio Frequency (RF)-based indoor localization technologies play significant roles in various Internet of Things (IoT) services (e.g., location-based service). Most such technologies require that all the devices comply with a specified technology (e.g., WiFi, ZigBee, and Bluetooth). However, this requirement limits its application scenarios in today's IoT context where multiple devices complied with different standards coexist in a shared environment. To bridge the gap, in this paper, we propose a cross-technology localization approach, which is able to localize target nodes using a different type of devices. Specifically, the proposed framework reuses the existing WiFi infrastructure without introducing additional cost to localize Non-WiFi device (i.e., ZigBee). The key idea is to leverage the interference between devices that share the same operating frequency (e.g., 2.4GHz). Such interference exhibits unique patterns that depend on the target device's location, thus it can be leveraged for cross-technology localization. The proposed framework uses Principal Components Analysis (PCA) to extract salient features of the received WiFi signals, and leverages Dynamic Time Warping (DTW), Gradient Boosting Regression Tree (GBRT) to improve the robustness of our system. We conduct experiments in real scenario and investigate the impact of different factors. Experimental results show that the average localization accuracy of our prototype can reach 1.54m, which demonstrates a promising direction of building cross-technology technologies to fulfill the needs of modern IoT context.
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He, Bangxiang,Hou, Lulu,Zhang, Feng,Cong, Xiaomei,Wang, Zhendong,Guo, Yalin,Shi, Jiawei,Jiang, Ming,Zhang, Xuecheng,Zang, Xiaonan The Korean Society of Phycology 2020 ALGAE Vol.35 No.3
Haematococcus pluvialis is a commercial microalga that can produce high quantities of astaxanthin. Under induced conditions, some important changes in the subcellular structures related to astaxanthin accumulation were observable. For example, a large number of astaxanthin granules, oil structures and starch granules appeared in the thick-walled cells; Astaxanthin granules gradually dissolved into the oil structures and spread throughout the entire cell with the fusion and diffusion process of oil structures during the middle and late stages of induction; The plastoglobules were closed to the newly formed structures, and some plastoglobules would abnormally increase in size under stress. Based on observations of cell damage, the degradation of membrane structures, such as chloroplasts, was found to be the primary form of damage during the early stage of induction. During the middle stage of induction, some transparent holes were exposed in the dissolving astaxanthin granules in the cytoplasm. In thick-walled cells, these transparent holes were covered by oil substances dissolving astaxanthin, thereby avoiding further damage to cells. Given the relatively few oil structures, in non-thick-walled cells, the transparent holes expanded to form multiple transparent areas, eventually resulting in the rupture and death of cells. These results suggested that the high level of synthesis and the wide range diffusion of oil explained the expansion of astaxanthin in H. pluvialis.
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