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167 results on '"Pan, Fengjuan"'

29. Shifts of bacterial community structure and function in long-term soybean monoculture.

Author

Pan, Fengjuan, Han, Xiaozeng, Zou, Wenxiu, Wang, Congli, Zhang, Zhiming, Liu, Hang, and Xu, Yanli

Subjects
*BACTERIAL communities, *MONOCULTURE agriculture, *NUCLEOTIDE sequencing, *AMMONIA-oxidizing bacteria, *BACTERIAL metabolism, *DENITRIFICATION
Abstract

Crop monoculture affects soil microbial community structure and diversity, but it is unclear which differences occur in microbial functions after the alteration of the bacterial community during crop monoculture. We investigated the diversity, functional groups and metabolic functions of bacteria under soybean rotation (RS), 2-year (SS) and 27-year (CS) soybean monoculture systems using high-throughput sequencing and functional prediction based on FAPROTAX and the Kyoto Encyclopedia of Genes and Genomes (KEGG). Original soil sample (OS) was taken as a reference point. Our results showed that CS had a lower abundance of the bacterial amoA gene than either RS or SS. Bacterial community differed more in OS than that in RS, SS and CS, and SS and CS had similar bacterial community and that they differed from RS. CS showed a lower relative abundance of predicted functional groups in terms of aerobic chemoheterotrophy, nitrate reduction and photoheterotrophy. KEGG annotation showed greater negative effects on the bacterial functional metabolism than positive effects in CS compared to RS. Redundancy analysis indicated that the predicted functional groups might be related to organic carbon and total nitrogen concentration, and that KEGG pathways were mainly affected by soil pH and available nitrogen. Abbreviations RS: soybean rotation; SS: two-year soybean monoculture; CS: long-term soybean monoculture; AOB: ammonia-oxidizing bacteria; qPCR: quantitative real-time PCR; OTUs: operational taxonomic units; SOC: soil organic carbon; TN: total nitrogen; AN: available nitrogen; TP: total phosphorus; AP: available phosphorus; AK: available potassium; PCoA: Principal coordinate analysis; KEGG: the Kyoto Encyclopedia of Genes and Genomes; RDA: redundancy analysis. [ABSTRACT FROM AUTHOR]

Published
2021
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39. Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Author

Zhang, Xuejie, primary, Fang, Mu-Huai, additional, Tsai, Yi-Ting, additional, Lazarowska, Agata, additional, Mahlik, Sebastian, additional, Lesniewski, Tadeusz, additional, Grinberg, Marek, additional, Pang, Wei Kong, additional, Pan, Fengjuan, additional, Liang, Chaolun, additional, Zhou, Wuzong, additional, Wang, Jing, additional, Lee, Jyh-Fu, additional, Cheng, Bing-Ming, additional, Hung, Tsu-Lien, additional, Chen, Yang-Yuan, additional, and Liu, Ru-Shi, additional

Published
2017
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40. Assessing the effects of water extract of Narcissus tazetta bulb on hatching, mortality, chemotaxis and reproduction of the soybean cyst nematode, Heterodera glycines.

Author

Hu, Yanfeng, You, Jia, Li, Chunjie, Pan, Fengjuan, and Wang, Congli

Subjects
SOYBEAN cyst nematode, SOIL amendments, REPRODUCTION, NEMATOCIDES, EXTRACTS, MORTALITY
Abstract

Summary: The aim of this study was to examine the impact of water extracts of Narcissus tazetta bulb on hatching, behaviour and mortality of second-stage juveniles (J2) and reproduction of the soybean cyst nematode (SCN; Heterodera glycines) in laboratory and glasshouse assays. Results demonstrated that N. tazetta bulb extracts did not affect hatching but significantly reduced J2 motility and nematode attraction to the soybean root tip, and resulted in considerable nematode mortality relative to the control. J2 exposure to different concentrations of bulb extracts caused 59-93% reduction in nematode reproduction on soybean roots. Compared with the monoculture control, soybean- N. tazetta intercropping in a pot trial reduced SCN reproduction by 37%. In addition, N. tazetta bulb powder as a soil amendment is effective in controlling SCN reproduction. Thus, the results suggest that N. tazetta bulb extract or derived active compounds may be considered as potential natural nematicides against SCN. [ABSTRACT FROM AUTHOR]

Published
2020
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50. Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr9Mg1.5−xKx(PO4)7:Eu2+ phosphors.

Author

Yu, Liping, Yan, Huifang, Fan, Yanting, Zhang, Jinhui, Ma, Zhongyun, Zhou, Wenli, Chen, Yan, Pan, Fengjuan, and Lian, Shixun

Abstract

Many approaches have contributed to improving the luminescence properties of phosphors, including surface coating, direct reduction and charge compensation, which are involved in reducing the inner or surface defects of luminescent particles. In this study, we propose a cation vacancy repair strategy to successfully improve the orange-yellow luminescence properties of the Sr9Mg1.5(PO4)7:Eu2+ phosphor. The main idea of the strategy is that introducing K+ repairs the vacancy at the Mg(1) site according to the formula UGRAPHIC DISPLAY="INLINE" ID="UGT1" SRC="UGT1"/. The preferred substitution of the large Mg(1) site by K+ is supported by theoretical calculations. As a result, the luminescence of the repaired phosphate phosphor was enhanced by 2.5 times, and the internal and external quantum efficiency significantly increased by 50.5% and 55.4%, respectively. Additionally, the thermal stability was also a little improved. The enhancement mechanisms for luminescence are discussed in detail based on investigations of the microstructure, luminescence spectra, decay curves and concentration using various analysis techniques. We find that low luminescence efficiency is due to the existence of vacancy defects in the phosphor. Through using the repaired Sr9MgK(PO4)7:Eu2+ phosphor, a white LED package demonstrated a low correlated color temperature (∼2900 K), high color rendering index (∼90) and R9 ＞ 91. We expect that the strategy proposed herein would improve luminescence for other phosphors with vacancy defects. [ABSTRACT FROM AUTHOR]

Published
2018
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