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Zou Y, Yan XL, Flores RM, Zhang LY, Yang SP, Fan LY, Deng T, Deng XJ, Ye DQ. Source apportionment and ozone formation mechanism of VOCs considering photochemical loss in Guangzhou, China. Sci Total Environ 2023; 903:166191. [PMID: 37567293 DOI: 10.1016/j.scitotenv.2023.166191] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 08/13/2023]
Abstract
Understanding the sources and impact of volatile organic compounds (VOCs) on ozone formation is challenging when the traditional method does not account for their photochemical loss. In this study, online monitoring of 56 VOCs was carried out in summer and autumn during high ozone pollution episodes. The photochemical age method was used to evaluate the atmospheric chemical loss of VOCs and to analyze the effects on characteristics, sources, and ozone formation of VOC components. The initial concentrations during daytime were 5.12 ppbv and 4.49 ppbv higher than the observed concentrations in the summer and autumn, respectively. The positive matrix factorization (PMF) model identified 5 major emission sources. However, the omission of the chemical loss of VOCs led to underestimating the contributions of sources associated with highly reactive VOC components, such as those produced by biogenic emissions and solvent usage. Conversely it resulted in overestimating the contributions from VOC components with lower chemical activity such as liquefied petroleum gas (LPG) usage, vehicle emissions, and gasoline evaporation. Furthermore, the estimation of ozone formation may be underestimated when the atmospheric photochemical loss is not taken into account. The ozone formation potential (OFP) method and propylene-equivalent concentration method both underestimated ozone formation by 53.24 ppbv and 47.25 ppbc, respectively, in the summer, and by 40.34 ppbv and 26.37 ppbc, respectively, in the autumn. The determination of the ozone formation regime based on VOC chemical loss was more acceptable. In the summer, the ozone formation regime changed from the VOC-limited regime to the VOC-NOx transition regime, while in the autumn, the ozone formation regime changed from the strong VOC-limited regime to the weak VOC-limited regime. To obtain more thorough and precise conclusions, further monitoring and analysis studies will be conducted in the near future on a wider variety of VOC species such as oxygenated VOCs (OVOCs).
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Affiliation(s)
- Y Zou
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou 510640, China
| | - X L Yan
- State Key Laboratory of Severe Weather & Institute of Tibetan Plateau Meteorology, Chinese Academy of Meteorological Sciences, Beijing, China
| | - R M Flores
- Marmara University, Department of Environmental Engineering, Istanbul, Turkey
| | - L Y Zhang
- Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou 510640, China
| | - S P Yang
- Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou 510640, China
| | - L Y Fan
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - T Deng
- Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou 510640, China
| | - X J Deng
- Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou 510640, China
| | - D Q Ye
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
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Ji XY, Deng XJ, Shi HY, Wang JP, Liu N. Effect of Sunflower Kernel Peptides Produced by Dual-Degradation on the Growth Performance, Nutrient Digestibility, and Health Status of Broilers. Braz J Poult Sci 2023. [DOI: 10.1590/1806-9061-2022-1743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Liu X, Deng XJ, Li CY, Xiao YK, Zhao K, Guo J, Yang XR, Zhang HS, Chen CP, Luo YT, Tang YL, Yang B, Sun CH, Wang PR. Mutation of Protoporphyrinogen IX Oxidase Gene Causes Spotted and Rolled Leaf and Its Overexpression Generates Herbicide Resistance in Rice. Int J Mol Sci 2022; 23:ijms23105781. [PMID: 35628595 PMCID: PMC9146718 DOI: 10.3390/ijms23105781] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 05/19/2022] [Indexed: 02/04/2023] Open
Abstract
Protoporphyrinogen IX (Protogen IX) oxidase (PPO) catalyzes the oxidation of Protogen IX to Proto IX. PPO is also the target site for diphenyl ether-type herbicides. In plants, there are two PPO encoding genes, PPO1 and PPO2. To date, no PPO gene or mutant has been characterized in monocotyledonous plants. In this study, we isolated a spotted and rolled leaf (sprl1) mutant in rice (Oryza sativa). The spotted leaf phenotype was sensitive to high light intensity and low temperature, but the rolled leaf phenotype was insensitive. We confirmed that the sprl1 phenotypes were caused by a single nucleotide substitution in the OsPPO1 (LOC_Os01g18320) gene. This gene is constitutively expressed, and its encoded product is localized to the chloroplast. The sprl1 mutant accumulated excess Proto(gen) IX and reactive oxygen species (ROS), resulting in necrotic lesions. The expressions of 26 genes associated with tetrapyrrole biosynthesis, photosynthesis, ROS accumulation, and rolled leaf were significantly altered in sprl1, demonstrating that these expression changes were coincident with the mutant phenotypes. Importantly, OsPPO1-overexpression transgenic plants were resistant to the herbicides oxyfluorfen and acifluorfen under field conditions, while having no distinct influence on plant growth and grain yield. These finding indicate that the OsPPO1 gene has the potential to engineer herbicide resistance in rice.
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Affiliation(s)
- Xin Liu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (X.L.); (C.-H.S.)
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Xiao-Jian Deng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (X.L.); (C.-H.S.)
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
- Correspondence: (X.-J.D.); (P.-R.W.)
| | - Chun-Yan Li
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Yong-Kang Xiao
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Ke Zhao
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Jia Guo
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Xiao-Rong Yang
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Hong-Shan Zhang
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Cong-Ping Chen
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Ya-Ting Luo
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Yu-Lin Tang
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Bin Yang
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Chang-Hui Sun
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (X.L.); (C.-H.S.)
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
| | - Ping-Rong Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; (X.L.); (C.-H.S.)
- Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China; (C.-Y.L.); (Y.-K.X.); (K.Z.); (J.G.); (X.-R.Y.); (H.-S.Z.); (C.-P.C.); (Y.-T.L.); (Y.-L.T.); (B.Y.)
- Correspondence: (X.-J.D.); (P.-R.W.)
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Huang KS, He DX, Huang DJ, Tao QL, Deng XJ, Zhang B, Mai G, Guha-Sapir D. Changes in ischemic heart disease mortality at the global level and their associations with natural disasters: A 28-year ecological trend study in 193 countries. PLoS One 2021; 16:e0254459. [PMID: 34242366 PMCID: PMC8270471 DOI: 10.1371/journal.pone.0254459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 06/26/2021] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Natural disasters are believed to be associated with cardiovascular disease. This study aimed to explore the changes in mortality due to ischemic heart disease (IHD) and their associations with natural disasters at the global level. METHODS Country-specific data on the impact of natural disasters, rates of mortality due to IHD and years of life lost (YLL) and socioeconomic variables were obtained for 193 countries for the period from 1990 to 2017. An ecological trend study was conducted to estimate the changes in the IHD mortality and YLL rates and their associations with natural disasters (occurrence, casualties and total damage). Correlation analyses and multivariate linear regression were used. RESULTS Significant changes were found in the IHD mortality and YLL rates and the occurrence of disasters between the two equal periods (1990 to 2003 and 2004 to 2017) (p<0.001). The bivariate Pearson correlation test revealed that the trend in the occurrence of natural disasters was positively correlated with trends in the IHD mortality and YLL rates among females and all individuals (p<0.05) and was marginally correlated among males. Multiple linear regression revealed an independent association between the occurrence of natural disasters and the IHD mortality rate among males, females and all individuals (standardized coefficients = 0.163, 0.357 and 0.241, p<0.05), and similar associations were found for the YLL rate (standardized coefficients = 0.194, 0.233 and 0.189, p<0.05). CONCLUSIONS Our study demonstrated significant changes in the IHD mortality and YLL rates at the global level and their independent associations with natural disasters. Both males and females were vulnerable to natural disasters. These results provide evidence that can be used to support policy making and resource allocation when responding to disasters and developing strategies to reduce the burden of IHD.
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Affiliation(s)
- Kai-Sen Huang
- Department of Cardiology, People’s Hospital of Deyang City, Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Deyang, Sichuan, China
- Department of Cardiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China
| | - Ding-Xiu He
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China
- Department of Emergency, People’s Hospital of Deyang City, Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Deyang, Sichuan, China
| | - De-Jia Huang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Qian-Lan Tao
- Department of Cardiology, Chengdu Medical College, Chengdu, China
| | - Xiao-Jian Deng
- Department of Cardiology, People’s Hospital of Deyang City, Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Deyang, Sichuan, China
| | - Biao Zhang
- Department of Neurology, People’s Hospital of Deyang City, Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Deyang, Sichuan, China
| | - Gang Mai
- Department of General Surgery, People’s Hospital of Deyang City, Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Deyang, Sichuan, China
| | - Debarati Guha-Sapir
- Centre for Research on the Epidemiology of Disasters, Institute of Health and Society, University of Louvain, Brussels, Belgium
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Deng XJ, Zheng HL, Ke XQ, Deng M, Ma ZZ, Zhu Y, Cui YY. Hsa-miR-34a-5p reverses multidrug resistance in gastric cancer cells by targeting the 3'-UTR of SIRT1 and inhibiting its expression. Cell Signal 2021; 84:110016. [PMID: 33894312 DOI: 10.1016/j.cellsig.2021.110016] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 04/06/2021] [Accepted: 04/19/2021] [Indexed: 12/24/2022]
Abstract
Multidrug resistance (MDR) is a major obstacle to chemotherapy, which leads to ineffective chemotherapy, an important treatment strategy for gastric cancer (GC). The abnormality of microRNAs (miRNAs) is critical to the occurrence and progression of MDR in various tumors. In this study, hsa-miR-34a-5p was found to be decreased in multidrug resistant GC cells SGC-7901/5-Fluorouracil (SGC-7901/5-Fu) compared to the parental SGC-7901 cells. Overexpression of hsa-miR-34a-5p in SGC-7901/5-Fu cells promoted apoptosis and decreased migration and invasiveness after chemotherapy. In addition, overexpression of hsa-miR-34a-5p suppressed the growth of drug-resistant tumor in vivo. The mechanism of the effects of hsa-miR-34a-5p could include the regulation of the expression of Sirtuin 1 (SIRT1), P-glycoprotein (P-gp) or Multidrug resistance-related protein 1 (MRP1) through direct binding to the 3'-untranslated region (UTR) of SIRT1. Functional gain-and-loss experiments indicated that hsa-miR-34a-5p enhances the chemotherapy sensitivity of MDR GC cells by inhibiting SIRT1, P-gp and MRP1. In conclusion, hsa-miR-34a-5p can reverse the MDR of GC cells by inhibiting the expression of SIRT1, P-gp or MRP1.
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Affiliation(s)
- X J Deng
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China; Department of Gastroenterology, The First Affiliated Hospital of Jinan University, China.
| | - H L Zheng
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
| | - X Q Ke
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
| | - M Deng
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
| | - Z Z Ma
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
| | - Y Zhu
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
| | - Y Y Cui
- Department of Gastroenterology, The First Affiliated Hospital of Bengbu Medical College, China
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Yin CQ, Solmon F, Deng XJ, Zou Y, Deng T, Wang N, Li F, Mai BR, Liu L. Geographical distribution of ozone seasonality over China. Sci Total Environ 2019; 689:625-633. [PMID: 31279208 DOI: 10.1016/j.scitotenv.2019.06.460] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 06/25/2019] [Accepted: 06/27/2019] [Indexed: 06/09/2023]
Abstract
Up to now, a nation-wide scale study of surface ozone (O3) concentrations in China was limited due to scarce observation. Thanks to the establishment of national air quality monitoring network in 2013, surface O3 data from 1402 stations during 2014-2017 were collected to investigate O3 seasonality. Our analysis reveals that the variations of monthly O3 averaged from daily mean concentration during a year show different temporal profiles depending on latitude. A unimodal structure (UMS) is generally found for latitudes over 35°N, whereas a bimodal structure (BMS) is in most of the cases identified south of 35°N. The peak of UMS is found in the period of May to July, whereas the first and second peaks of BMS are found from April to June, and from July to October, respectively. In addition, the seasonality of O3 presents a strong dependence on pseudo-equivalent potential temperature and monsoonal clouds. The onset and retreat of warm and wet air are correlated to the summer minimum in BMS cases and to the sharp decrease of UMS in July. As far as the relationships between O3 and carbon monoxide are concerned, the effects of clean maritime air masses on the summer trough of O3 are not significant for inland sites. Overall, summer monsoon bringing warm and moist air and subsequent clouds leads to the suppression of photochemical production, thereby contributing directly to the geographical distribution of O3 seasonality.
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Affiliation(s)
- C Q Yin
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China.
| | - F Solmon
- Laboratoire d'Aérologie, Centre National de la Recherche Scientifique, Toulouse, France
| | - X J Deng
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - Y Zou
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - T Deng
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - N Wang
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - F Li
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - B R Mai
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
| | - L Liu
- Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
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Song S, Xu YP, Wu ZF, Deng XJ, Wang Q. The relative impact of urbanization and precipitation on long-term water level variations in the Yangtze River Delta. Sci Total Environ 2019; 648:460-471. [PMID: 30121045 DOI: 10.1016/j.scitotenv.2018.07.433] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 07/19/2018] [Accepted: 07/30/2018] [Indexed: 06/08/2023]
Abstract
The combined and individual hydrological impacts of climate variation and urbanization have been extensively discussed over the past few decades, yet little is known about the relative impact of each. In this paper we took one of the most developed regions worldwide, Yangtze River Delta, as an example to analyse the long-term relative impacts of precipitation and urbanization change on water level alterations, based on precipitation, water level series, and annual impervious area data from 1960 to 2015. Abrupt changes detection in the water level series divided the data into the pre-impact period (1960-1988) and impacted period (1989-2015), and relative impacts of precipitation and urbanization on the water level increase from pre-impacted to impacted period, as well as their spatial and seasonal variations were estimated with the elasticity method. The results indicated that the urbanization change showed no distinct influence on the water level rise in the pre-impact period, while the precipitation played distinct roles only during summer months in the impacted period; the precipitation dominated two thirds of the water level rise in flood season, and in non-flood season the urbanization controlled the two thirds of the water level rise; spatially, the water level variations in old and new urban area were dominated by precipitation and urbanization process respectively; compared with precipitation amount, the water level correlated more strongly to the contribution ratio of precipitation. The results would provide a good reference for flood control and water resource management in the river basin, especially in the economically developed areas.
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Affiliation(s)
- S Song
- School of Geographical Sciences, Guangzhou University, Guangzhou, China; School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China.
| | - Y P Xu
- School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China
| | - Z F Wu
- School of Geographical Sciences, Guangzhou University, Guangzhou, China
| | - X J Deng
- School of Economics, Zhejiang University of Finance & Economics, Hangzhou, China
| | - Q Wang
- School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China
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Li TY, Deng XJ, Li Y, Song YS, Li LY, Tan HB, Wang CL. Transport paths and vertical exchange characteristics of haze pollution in Southern China. Sci Total Environ 2018; 625:1074-1087. [PMID: 29996404 DOI: 10.1016/j.scitotenv.2017.12.235] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 12/03/2017] [Accepted: 12/20/2017] [Indexed: 06/08/2023]
Abstract
Transport paths and vertical exchange characteristics are important factors for understanding the long-term transport, dispersion capability for haze prediction. Many previous studies revealed that the Pearl River Delta (PRD) region, one of the major polluted areas in China, is largely affected by the long-range pollution transport. However, mostly of these studies focused on the source apportionment or horizontal transport path of pollutants by using short-term data, and the vertical exchange characteristics had been rarely analyzed. In this study, using HYSPLIT model, the transport paths and the vertical exchange characteristics of haze episodes over four sub-region of Guangdong (GD) Province in southern China of dry season and wet season were analyzed by using 10years data from 2005 to 2014. Three major transport paths can be statistically summarized based on the long-term data. The haze episodes in PRD and North-GD were distinguished by the characteristics of high frequency and long duration, while the West-GD and East-GD are relatively clean. The haze over North-GD and PRD were mainly influenced by the airflows from northern path, which could bring the pollution from Jiangxi, Anhui, and also influenced by the airflows from coastal path, which could bring the pollution of eastern coastal from Zhejiang and Fujian to Guangdong, while regional transport contributions from Guangdong province and adjacent areas can also be clearly observed. The haze pollution from the identified two major transport paths were mainly transported within the mixing layer (>80% trajectories, <500m), whereas the probability of haze trajectories across mixing layer was relatively low and generally associated with much longer transport distance and higher terrain height over Western China. Combing the vertical exchange analysis, results also show that Wuyi Mountains and Nanling Mountains played a role as barrier to obstruct the haze airflows from other regions of China to the Guangdong province.
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Affiliation(s)
- T Y Li
- Guangdong Ecological Meteorological Center, Guangzhou, China
| | - X J Deng
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China.
| | - Y Li
- Ocean Department of Science and Engineering, Southern University of Science and Technology, Shenzhen, China.
| | - Y S Song
- Ocean Department of Science and Engineering, Southern University of Science and Technology, Shenzhen, China
| | - L Y Li
- Panyu Meteorological Service, Guangzhou, China
| | - H B Tan
- Guangdong Ecological Meteorological Center, Guangzhou, China
| | - C L Wang
- Guangzhou Climate and Agrometeorology Center, Guangzhou, China
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Wang N, Lyu XP, Deng XJ, Guo H, Deng T, Li Y, Yin CQ, Li F, Wang SQ. Assessment of regional air quality resulting from emission control in the Pearl River Delta region, southern China. Sci Total Environ 2016; 573:1554-1565. [PMID: 27642074 DOI: 10.1016/j.scitotenv.2016.09.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 08/31/2016] [Accepted: 09/02/2016] [Indexed: 05/21/2023]
Abstract
To evaluate the impact of emission control measures on the air quality in the Pearl River Delta (PRD) region of South China, statistic data including atmospheric observations, emissions and energy consumptions during 2006-2014 were analyzed, and a Weather Research and Forecasting - Community Multi-scale Air Quality (WRF-CMAQ) model was used for various scenario simulations. Although energy consumption doubled from 2004 to 2014 and vehicle number significantly increased from 2006 to 2014, ambient SO2, NO2 and PM10 were reduced by 66%, 20% and 24%, respectively, mainly due to emissions control efforts. In contrast, O3 increased by 19%. Model simulations of three emission control scenarios, including a baseline (a case in 2010), a CAP (a case in 2020 assuming control strength followed past control tendency) and a REF (a case in 2020 referring to the strict control measures based on recent policy/plans) were conducted to investigate the variations of air pollutants to the changes in NOx, VOCs and NH3 emissions. Although the area mean concentrations of NOx, nitrate and PM2.5 decreased under both NOx CAP (reduced by 1.8%, 0.7% and 0.2%, respectively) and NOx REF (reduced by 7.2%, 1.8% and 0.3%, respectively), a rising of PM2.5 was found in certain areas as reducing NOx emissions elevated the atmospheric oxidizability. Furthermore, scenarios with NH3 emission reductions showed that nitrate was sensitive to NH3 emissions, with decreasing percentages of 0-10.6% and 0-48% under CAP and REF, respectively. Controlling emissions of VOCs reduced PM2.5 in the southwestern PRD where severe photochemical pollution frequently occurred. It was also found that O3 formation in PRD was generally VOCs-limited while turned to be NOx-limited in the afternoon (13:00-17:00), suggesting that cutting VOCs emissions would reduce the overall O3 concentrations while mitigating NOx emissions in the afternoon could reduce the peak O3 levels.
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Affiliation(s)
- N Wang
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China.
| | - X P Lyu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - X J Deng
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China.
| | - H Guo
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - T Deng
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China
| | - Y Li
- Division of Environment, Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - C Q Yin
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China
| | - F Li
- Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China
| | - S Q Wang
- Zhuhai Meteorological Bureau, Zuhai, China
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10
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Zhang FT, Fang J, Sun CH, Li RB, Luo XD, Xie JK, Deng XJ, Chu CC. Characterisation of a rice dwarf and twist leaf 1 (dtl1) mutant and fine mapping of DTL1 gene. Hereditas (Beijing) 2012; 34:79-86. [DOI: 10.3724/sp.j.1005.2012.00079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Huang YB, Dai JJ, Deng XJ, Qu YC, Guo QX, Fu Y. Ruthenium-catalyzed conversion of levulinic acid to pyrrolidines by reductive amination. ChemSusChem 2011; 4:1578-1581. [PMID: 21922683 DOI: 10.1002/cssc.201100344] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Yao-Bing Huang
- Anhui Province Key Laboratory of Biomass Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei, PR China
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12
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Huang YB, Yang CT, Yi J, Deng XJ, Fu Y, Liu L. Cu-Catalyzed Carbon-Heteroatom Coupling Reactions under Mild Conditions Promoted by Resin-Bound Organic Ionic Bases. J Org Chem 2010; 76:800-10. [DOI: 10.1021/jo101917x] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Yao-Bing Huang
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China, Hefei 230026
| | - Chu-Ting Yang
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China, Hefei 230026
| | - Jun Yi
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China, Hefei 230026
| | - Xiao-Jian Deng
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China, Hefei 230026
| | - Yao Fu
- Department of Chemistry, Joint Laboratory of Green Synthetic Chemistry, University of Science and Technology of China, Hefei 230026
| | - Lei Liu
- Department of Chemistry, Tsinghua University, Beijing 100084, China
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Abstract
In higher plant, flowering transition represents a crucial transition from the vegetative stage to the reproductive stage in life cycle. This process is controlled by both endogenous and environmental factors. In Arabidopsis thaliana, four pathways, photoperiod pathway, vernalization pathway, autonomous pathway, and GA pathway were involved in flowering control. These flowering transition pathways are shown to be highly conserved in Arabidopsis and other higher plants including rice (Oryza sativa L.). This review summarizes recent progresses on flowering time control.
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Affiliation(s)
- Chang-Hui Sun
- Institute of Rice Research, Sichuan Agricultural University, Chengdu 611130, China.
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Wang PR, Deng XJ, Gao XL, Chen J, Wan J, Jiang H, Xu ZJ. [Progress in the study on DREB transcription factor]. Yi Chuan 2006; 28:369-74. [PMID: 16551608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
DREB transcription factor is a dehydration responsive element (DRE) binding protein. It can specifically interact with the dehydration-responsive element/C-repeat (DRE/CRT) cis-acting element contained in the promoter region of many stress-inducible genes, and can therefore control the expression of many stress-inducible genes in plant and increase strong tolerance to drought, low temperature and high salt. In this paper we described the relation between DREB transcription factor and DRE/CRT cis-acting element, the functional and structural character, and expression and regulation of DREB. We also briefly introduced the progress of research on DREB gene cloning and identification. DREB transcription factor plays an important role in the expression of many stress-inducible genes in plant, so it thus shows a very broad application future in aspect of increasing strong tolerance to stress. At the same time, we described the DREB complexity in signal transduction and the mechanism for action and expression of gene.
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Affiliation(s)
- Ping-Rong Wang
- Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China.
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15
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Sun YY, Lü Y, Dong CL, Wang PR, Huang XQ, Deng XJ. [Progress in regulation of rice Wx gene expression]. Yi Chuan 2005; 27:1013-9. [PMID: 16378955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The granule-bound starch synthase(GBSS) is encoded by the rice Wx gene, which is the major gene for control of amylase synthesis of. This paper briefly introduced the progress in regulation of rice Wx gene expression at transcriptional level and post-transcriptional level. At the same time the influence of transgene, genetic background and temperature condition on Wx gene expression in rice was discussed. Finally some urgent questions were suggested for the further study on regulation of rice Wx gene expression.
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Affiliation(s)
- Ye-Ying Sun
- Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China.
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16
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Liu FX, Tan ZB, Zhu JQ, Deng XJ. [Arabidopsis CBF1 in plant tolerance to low temperature and drought stresses]. Yi Chuan 2004; 26:394-8. [PMID: 15640027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Since it was established that the alteration in gene expression occur during cold acclimation, a major goal in cold acclimation research has been to identify cold-responsive genes and to determine whether they play roles in freezing tolerance. Many cold-regulated genes (COR) were isolated and characterized in Arabidopsis and other cold tolerant plant species. Studies on regulation of COR in Arabidopsis have resulted in the discovery of a family of transcriptional activators, of which, CBF1, a member of the gene family, controls expression of a battery of COR in Arabidopsis and other cold tolerant plant species. During recent years, CBF-like genes were found in the genomes of chilling-sensitive plant species such as tomato and maize. Over-expression of Arabidopsis CBF1 confers elevated tolerance to chilling and drought stresses in transgenic tomato. These results promote our effort to identify and characterize CBF-like genes to improve tolerance of chilling-sensitive plant species to chilling and drought stresses.
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Affiliation(s)
- Fen-Xia Liu
- Beijing Agro-biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100 089, China
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17
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Deng XJ, Zhou KD, Li RD, Li P, Huang GS, Chun Z. [Genetic analysis of dominant earliness of rice genic male sterile line 6442S-7]. Yi Chuan Xue Bao 2001; 28:628-34. [PMID: 11480174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
F1 progenies of a genic male sterile and early maturing indica line 6442S-7 crossed with sixteen medium or late maturing varieties, such as Minghui 63, shared the same heading date as 6442S-7 under long day and short day, suggesting that 6442S-7 has completely dominant earliness. Segregation of heading dates of the F2 and B1F1 populations indicated that the earliness of 6442S-7 is mainly controlled by two dominant major genes. Whereas, heading dates of F1 progenies of 6442S-7 crossed with other four late maturing varieties, i.e. IR68, Xianguo, 9311, and BG1639, closed to the mid-parent value under long day. In F2 populations of 6442S-7 crossed with each of the four late maturing varieties, F1 from three-way crosses between 6442S-7 and each F1 of Minghui 63 crossed with each of the four late maturing varieties, and F1 from three-way crosses between 6442S-7 and each F1 of crosses between each two of the four late maturing varieties, segregation of heading dates showed that an incompletely diminant allelic suppressor for the dominant earliness of 6442S-7 existed in the late maturing varieties, IR68, Xianguo, 9311, and BG1639. It is considered that dominant earliness genes harbored in 6442S-7 have splendid future in rice improvement.
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Affiliation(s)
- X J Deng
- Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China
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18
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Abstract
Graded porous titanium coatings have been deposited on titanium substrates for dental implants by plasma spraying in an argon atmosphere. X-ray diffraction (XRD), scanning electron microscopy (SEM), surface roughness measurement, and tensile strength tests were performed on graded porous coatings. The results showed that Ti(3)O(5) was formed in the outermost surface of the porous coatings due to oxidation. The graded porous coatings consisted of three layers. The outer layer was full of macropores with a surface roughness of approximately 100 microm. The diameter of many macropores reached and even surpassed 150 microm, which could be beneficial for tissue to grow into the coating. The middle layer consisted of a mixture of micropores and macropores. The inner layer was a very dense and tight interface layer that included mechanical, physical, and metallurgical bonding. In tensile strength tests, testing bars peeled off the coatings, because the adhesive agent fractured, but the coatings remained intact.
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Affiliation(s)
- Y Z Yang
- Beijing Fine Ceramics Laboratory, Key State Laboratory of New Ceramics and Fine Processing, Institute of Nuclear Energy Technology, Tsinghua University, Beijing, 100084, P.R. China.
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Abstract
Histochemical characteristics and the distribution of gastric intramucosal cysts were studied in 50 cancerous and 51 benign gastrectomy specimens. The frequency of such cysts was significantly higher in stomachs with carcinoma (70%) than in stomachs with peptic ulcer (43%) (P less than 0.01). Intramucosal cysts were classified into gastric type, small intestinal type, colonic type and non-mucous type. There were significant differences in the constituent ratios of the four types of cyst between gastric carcinoma and gastric ulcer (P less than 0.01), as well as between intestinal type and diffuse type cancer (P less than 0.001). The present results reveal a close relationship between intramucosal cysts and gastric carcinoma. Cysts of small intestinal, colonic and non-mucous types were associated with intestinal type cancer while cysts of gastric type were related to diffuse type cancer of the stomach.
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Qian ZC, Cheng YZ, Xu GY, Tan HN, Deng XJ. [Establishment and experimental study of a transplantable hepatocellular carcinoma model in 615-strain mice (H 615)]. Zhonghua Zhong Liu Za Zhi 1987; 9:187-9,12. [PMID: 3447859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
H 615, the first transplantable mouse liver carcinoma model established in China, was derived from a spontaneous hepatocellular carcinoma of an inbred 615 mouse and has been successfully propagated for 52 generations during the past 7 years and more. Its biologic and pathologic features are relatively stable. H 615 was a syngenic transplantable tumor model of 615-strain mice with a successful transplantation rate of 85.6% without spontaneous regression. The course of tumor growth after subcutaneous inoculation was divided into 4 stages: latent, slowly growing, rapidly growing and terminal stages. Cancer metastasis was rare. The tumor-bearing host would die of cachexia finally. The mean survival time was 62.2 +/- 11.0 days regardless of sex or age. Histologically and ultrastructurally, H 615 was a well-differentiated hepatocellular carcinoma, rather resembling human liver carcinoma. The short-term primary passage culture of H 615 showed that, in vitro, tumor tissue could easily grow into monolayer, the majority of which appeared as epithelioid cells in cytomorphology. Therapeutic tests of 15 anticancer drugs showed that H 615 was sensitive, in varying degrees, to 5 drugs, i. e. MMC, Thio-Tepa, 5FU, CPT and DACT. The inhibition rate of MMC and Thio-Tepa could be as high as 100%. These experimental results are similar to those of the human liver cancer chemotherapy. Hence, the authors believe that H 615 may be a useful model in experimental study of the liver cancer and screening of anticancer drugs.
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Deng XJ, Wu DL. [Video-cholangiographic study of the effect of the Chinese medicinal herb prescription--Li dan pai shi decoction--on biliary dynamics]. Zhong Xi Yi Jie He Za Zhi 1985; 5:338-40, 323. [PMID: 3161648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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22
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Liu YH, Deng XJ. [A case of malignant mesothelioma of the pericardium (author's transl)]. Zhonghua Zhong Liu Za Zhi 1981; 3:74-6. [PMID: 7307885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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