25 results on '"Xu, Rongrong"'
Search Results
2. Volatile organic components detection with SPME/GC-MS technology in various ripening banana peels
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Zhou, Chuanyue, Meng, Luli, Xu, Rongrong, Chen, Tong, Zhang, Dingyu, Cheng, Qianwei, Hu, Bo, and Sun, Tingguang
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To distinguish banana ripening stages based on their volatile organic compounds (VOCs) and aroma properties, banana samples with different ripening processes were divided into five stages (green ripe, yellow ripe, browning stage 1, browning stage 2, and browning stage 3) based on digital images and the K-means clustering algorithm, and their VOCs were determined. A total of 35 VOCs were identified using solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS), including aldehydes, alcohols, esters, ketones, terpenoids, and other alkanes. Ten VOCs belonging to 7 aroma categories (pineapple, banana, fruity, apple, grass, sweet, and green aromas) were distinguished according to the radar fingerprint chart. Principal component analysis (PCA) and linear discriminant analysis (LDA) were used separately to analyze the differences and establish classification models based on the relative content of banana peel VOCs. For bananas at different ripening stages, PCA and LDA provided good discrimination accuracy based on the dataset. Therefore, banana peel VOCs and their aroma characteristics can serve as effective indices for evaluating the banana ripening stage.
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- 2023
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3. Nanoplastics promote the dissemination of antibiotic resistance through conjugative gene transfer: implications from oxidative stress and gene expressionElectronic supplementary information (ESI) available: ESI-test 1. Detection of bacterial intracellular ROS. ESI-text 2. Determination of cell membrane permeability. ESI-text 3. Scanning electron microscopy. ESI-text 4. Detailed operation procedures for qPCR and the calculation of mRNA expression. Fig S1. Images of scanning electron microscope (SEM) for polystyrene nanoplastics with a diameter of 80 nm (a) and 800 nm (b), respectively. Fig. S2. Optimization of the conjugative transfer microcosms. Table S1. Annealing temperature of 16S rRNA and 16 ARGs and other information. See DOI: https://doi.org/10.1039/d2en01036d
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Liu, Xiaowei, Xu, Rongrong, Wu, Heyang, Xu, Kaiwen, Zhang, Wenjing, Wang, Zongyu, and Gong, Wenwen
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Antibiotic resistance is a growing challenge and a major public health concern worldwide. Nanoplastics, which are ubiquitous in aquatic ecosystems, may cause a potential risk to the dissemination of antibiotic resistance genes (ARGs) in bacteria. However, the extent to which nanoplastics can cause an increase in antibiotic resistance by the regulation of the conjugative transfer of ARGs within bacteria remains unknown. In this study, polystyrene nanoplastics (PSNPs) with small sizes (S-PSNPs) and large sizes (L-PSNPs) were applied at a wide concentration range of 0.1–200 mg L−1to investigate their effects on plasmid-mediated conjugative transfer of ARGs between E. colistrains. The results revealed that S-PSNPs significantly enhanced the conjugative transfer frequency of the RP4 plasmid up to 1.51 fold at the 10 mg L−1exposure level compared with untreated cells; however, L-PSNPs generally caused no significant effect. We also employed multiple approaches to reveal the mechanisms, which demonstrated that PSNPs facilitated the conjugative transfer of ARGs by inducing excessive reactive oxygen species and oxidative stress, increasing cell membrane permeability, up-regulating the expression of mating pair formation genes (trbBpand traF) and DNA transfer and replication genes (trfApand traJ), and down-regulating the global regulatory gene expression (korA, korB, and trbA). These findings provide insights regarding the contributions and the underlying mechanisms of nanoplastics to the dissemination of ARGs, and are helpful for the evaluation of the public health and environmental and ecological risks caused by nanoplastics.
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- 2023
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4. Stronger winds increase the sand-dust storm risk in northern ChinaElectronic supplementary information (ESI) available: Document S1. ESI Fig. S1–S3. See https://doi.org/10.1039/d2ea00058j
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Liu, Yi, Xu, Rongrong, Ziegler, Alan D., and Zeng, Zhenzhong
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The biggest sand-dust storm from Mongolia in the past decade swept across northern China on March 15, 2021. Before this sudden outbreak, the number of sand-dust storms in northern China had been decreasing for 50 years. Wind and sand resources are the two key elements for sand-dust storms to occur. With an abrupt shift to a drier and hotter climate in the past 20 years over inner East Asia providing more sand resources and an increasing wind speed trend, the sand-dust storm in 2021 may herald the beginning of an era with more sand-dust storms. To answer whether increasing wind speed will significantly influence the sand-dust storm frequency, this study analyzed the relationship between the annual average wind speed and sand-dust storm days in northern China and Mongolia, finding that they have a high correlation (R= 0.94) in northern China and a moderate correlation (R= 0.41) in Mongolia. We further found that the wind speed during sand-dust storms also decreased, which further supports that the decrease of sand-dust storm frequency is mainly reasoned from the decrease of wind speed. Therefore, as the wind speed increases, the sandstorm frequency can increase as well, which has been seen clearly in Mongolia but may be just beginning in China.
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- 2022
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5. Geographically constrained resource potential of integrating floating photovoltaics in global existing offshore wind farms
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Jin, Yubin, Zeng, Zhenzhong, Chen, Yuntian, Xu, Rongrong, Ziegler, Alan D., Chen, Wenchuang, Ye, Bin, and Zhang, Dongxiao
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•Floating photovoltaics around turbines increase wind farm production by 7 times.•Floating photovoltaics cover 17 % area, doubling wind farm annual output.•Floating photovoltaics cover 11 % area, boosting 76 % power with the same investment.•Offshore wind and solar complement on monthly scales, especially in high latitudes.
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- 2024
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6. Precise Laser-Modulated Anion Exchange on Ultraflexible Perovskite Films for Multicolor Patterns
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Yin, Qianxi, Xu, Rongrong, Wang, Xiaoting, Li, Mulin, Huang, Xianliang, Chen, Ziyi, Ma, Teng, Xie, An, Chen, Jun, and Zeng, Haibo
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Lead halide perovskite anion exchange reactions tend to be spontaneous and rapid. To achieve precise control of anion exchange and modulate the bandgaps of perovskites to meet the demands in full-color displays, a laser-induced liquid-phase anion exchange method is developed in this paper. CsPbBr3perovskites embedded in a polymer matrix are converted to CsPb(BrxCl1–x)3and CsPb(BrxI1–x)3perovskites, realizing the shift from green fluorescence to blue and red fluorescence. By changing the laser parameters, the anion exchange extent and luminescence wavelength are precisely tuned, with the maximum tuning wavelength range of 431–696 nm. Due to the focusing properties of the laser, the spatial position of anion exchange can be precisely controlled, which is significant for realizing fast and accurate patterning without masks. Based on this method, blue patterns with different light-emitting wavelengths are fabricated. RGB three-color patterns on a single perovskite composite film are successfully prepared by further replacement of halogen ions. More importantly, the polymer matrix provides ultraflexibility and good stability for the films; even if the composite films are arbitrarily folded or repeatedly bent, they can still maintain good luminous intensity. This method will show great potential in the field of flexible, full-color displays.
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- 2024
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7. Effect of process parameters on the densification of SLM-produced Mg–Y–Sm–Zn–Zr alloy
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Zhao, Di, Wang, Wenli, Wang, Kongkong, Xu, Rongrong, Li, Haoyang, and Dong, Guowen
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In this study, Mg–Y–Sm–Zn–Zr samples were prepared using the selective laser melting technique. The influence of process parameters on the densification and mechanical properties of samples was systematically studied from a single-melt track to double melt tracks to block, and the formation mechanism of defects was analysed. Research results show that the appropriate laser power and scanning speed resulted in excellent single-melt path formability. When the scanning spacing was 80 μm, adjacent trajectories were closely connected without spheroidised particles and porosity defects. The densest samples were obtained at an energy density of 125 J/mm3with maximum microhardness (86.8 ± 1.5 HV), and the compressive yield strength and ultimate strength reached 301.8 ± 5 MPa and 467.9 ± 5 MPa.
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- 2024
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8. Effect of acute PM2.5 exposure on PTGS2 and RNA m6A modification.
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Li, Zhigang, Su, Qiaoqiao, Xu, Rongrong, Peng, Jianhao, Wang, Zhanshan, Zhu, Xiaojing, and Wei, Yongjie
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RNA modification & restriction ,PARTICULATE matter ,RNA methylation ,MONONUCLEAR leukocytes ,DISEASE risk factors - Abstract
Particulate matter 2.5 (PM 2.5) is a prevalent risk factor in many diseases, but its molecular mechanism remains ambiguous and may be diverse. RNA m
6 A is an important epigenetic modification that regulates gene expression at the post-transcriptional level. Some previous animal exposure studies found that PM 2.5 exposure up-regulated m6 A RNA methylation in the lung, but there is no research on m6 A RNA methylation in humans from PM 2.5 exposure now. Here, in the present experiment, we performed a panel study of 65 students at the Chinese research academy of environmental sciences (CRAES) with 3 rounds of follow-up visits from August 2021 to January 2022. We examined m6 A RNA modification profiles of peripheral blood mononuclear cells (PBMCs) from subjects after low and high concentrations of ambient PM 2.5 exposure. We applied a linear mixed-effect (LME) model to investigate the association between PM 2.5 exposure and global m6 A RNA methylation and PTGS2 level in peripheral blood. We found that increased levels of global m6A RNA methylation and PTGS2 level were associated with higher PM 2.5 exposure. Among the methylated mRNAs, PTGS2 was hyper-methylated after high concentrations of PM 2.5 exposure, which coincided with the increased expression of PTGS2 mRNA. In the present study, we determined that PM 2.5 exposure promoted RNA m6A modification, and PTGS2 in peripheral blood could serve as a novel regulatory factor of inflammation induced by PM 2.5 exposure. Furthermore, RNA m6 A modification may contribute to the altered expression of PTGS2 induced by PM 2.5 exposure. Our finding provided a new perspective for the prevention and treatment of PM 2.5 exposure-induced adverse health effects. [Display omitted] • Elevated levels of m6 A RNA methylation were associated with higher PM 2.5 exposure. • Increased levels of PTGS2 level were associated with higher PM 2.5 exposure. • RNA m6 A contribute to the altered expression of PTGS2 induced by PM 2.5 exposure. [ABSTRACT FROM AUTHOR]- Published
- 2023
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9. Long noncoding RNA MST1P2 promotes cervical cancer progression by sponging with microRNA miR-133b
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Xu, Rongrong, Zhang, Xiaoyue, Xu, Yan, Wang, Junqin, Li, Zhihui, and Cui, Xiaoming
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ABSTRACTLong noncoding RNA (lnc RNA) is aberrant expressed in many kinds of tumors and may be concerned with the occurrence and progression of tumors. Lnc RNA MST1P2 is increased in cervical cancer (CC), but its mechanism in CC has not been clarified. In this study, RT-qPCR was employed to analyze Lnc MST1P2 and miR-133b expression. CCK8 and cell apoptosis assay detect the proliferation optical density (OD) value and apoptosis rate. Cell metastasis was evaluated by Wound-healing assay and Transwell assay. Dual-Luciferase assay analyzed the relationship between Lnc MST1P2 and miR-133b. In vivo experiment was performed by establishing xenograft animal model. We found that Lnc MST1P2 is obviously overexpression in CC tissues and cells. Si-Lnc MST1P2 obviously repressed cell growth, cell migration, and cell invasion in Hela and SIHA cells. Moreover, Si-Lnc MST1P2 suppressed CC tumorigenesis in vivo. Dual-Luciferase assay and RT-qPCR assay further proved that Lnc MST1P2 has a negative regulation to miR-133b. miR-133b up-regulation inhibited cell viability and metastasis of Hela and SIHA cells. miR-133b inhibition notably decreased the anti-cancer effect of si-Lnc MST1P2. LncRNA MST1P2 serves as a Cervical Cancer oncogene by sponging with miR-133b.
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- 2021
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10. A Case of Critically Ill Infant of Coronavirus Disease 2019 With Persistent Reduction of T Lymphocytes
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Qiu, Liru, Jiao, Rong, Zhang, Aiming, Chen, Xi, Ning, Qin, Fang, Feng, Zeng, Fang, Tian, Niannian, Zhang, Yi, Huang, Yafei, Sun, Ziyan, Dhuromsingh, Menaka, Li, Hao, Li, Yang, Xu, Rongrong, Chen, Yu, and Luo, Xiaoping
- Abstract
Supplemental Digital Content is available in the text.
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- 2020
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11. Apelin-36 alleviates LPS-induced trophoblast cell injury by inhibiting GRP78/ASK1/JNK signaling.
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Xu, Rongrong, Liu, Yali, Hao, Man, and Cao, Gui
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TROPHOBLAST ,REVERSE transcriptase polymerase chain reaction ,PROTEOMICS ,PEPTIDES ,APELIN - Abstract
Pre-eclampsia (PE) is a type of hypertensive disorder of pregnancy that poses a serious threat to the health of both mother and fetus. Inhibition of the inflammatory environment on trophoblast cells is of great significance to improve PE. Apelin-36 is an endogenous active peptide with strong anti-inflammatory activity. Therefore, this study aims to investigate the effects of Apelin-36 on lipopolysaccharide (LPS)-induced trophoblast cells and its potential mechanism. The levels of inflammatory factors (TNF-α, IL-8, IL-6 and MCP-1) were detected by reverse transcription-quantitative PCR (RT-qPCR). The proliferation, apoptosis, migration and invasion capacities in trophoblast cells were detected by CCK-8, TUNEL staining, wound healing and Transwell assays, respectively. GRP78 was overexpressed by cell transfection. Western blot was applied for the identification of protein levels. Apelin concentration-dependently decreased the expression of inflammatory cytokines and p-p65 protein level in trophoblast cells induced by LPS. Apelin treatment reduced LPS-induced apoptosis and improved the proliferation, invasion and migration capacities of LPS-mediated trophoblast cells. Additionally, Apelin down-regulated GRP78, p-ASK1 and p-JNK protein levels. The inhibition on LPS-induced trophoblast cell apoptosis and the promotion on invasion and migration by Apelin-36 was counteracted by GRP78 overexpression. To sum up, Apelin-36 could alleviate LPS-induced cell inflammation and apoptosis and improve the invasion and migration of trophoblasts by inhibiting the GRP78/ASK1/JNK signaling. • Apelin-36 reduces LPS-induced trophoblastic inflammation and apoptosis and improved invasion. • Apelin-36 attenuates LPS-induced trophoblast cell injury by inhibiting GRP78/p-ASK1/p-JNK signaling. • Apelin-36 may be a potential target for attenuating Pre-eclampsia. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Allele-defined genome of the autopolyploid sugarcane Saccharum spontaneumL.
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Zhang, Jisen, Zhang, Xingtan, Tang, Haibao, Zhang, Qing, Hua, Xiuting, Ma, Xiaokai, Zhu, Fan, Jones, Tyler, Zhu, Xinguang, Bowers, John, Wai, Ching Man, Zheng, Chunfang, Shi, Yan, Chen, Shuai, Xu, Xiuming, Yue, Jingjing, Nelson, David R., Huang, Lixian, Li, Zhen, Xu, Huimin, Zhou, Dong, Wang, Yongjun, Hu, Weichang, Lin, Jishan, Deng, Youjin, Pandey, Neha, Mancini, Melina, Zerpa, Dessireé, Nguyen, Julie K., Wang, Liming, Yu, Liang, Xin, Yinghui, Ge, Liangfa, Arro, Jie, Han, Jennifer O., Chakrabarty, Setu, Pushko, Marija, Zhang, Wenping, Ma, Yanhong, Ma, Panpan, Lv, Mingju, Chen, Faming, Zheng, Guangyong, Xu, Jingsheng, Yang, Zhenhui, Deng, Fang, Chen, Xuequn, Liao, Zhenyang, Zhang, Xunxiao, Lin, Zhicong, Lin, Hai, Yan, Hansong, Kuang, Zheng, Zhong, Weimin, Liang, Pingping, Wang, Guofeng, Yuan, Yuan, Shi, Jiaxian, Hou, Jinxiang, Lin, Jingxian, Jin, Jingjing, Cao, Peijian, Shen, Qiaochu, Jiang, Qing, Zhou, Ping, Ma, Yaying, Zhang, Xiaodan, Xu, Rongrong, Liu, Juan, Zhou, Yongmei, Jia, Haifeng, Ma, Qing, Qi, Rui, Zhang, Zhiliang, Fang, Jingping, Fang, Hongkun, Song, Jinjin, Wang, Mengjuan, Dong, Guangrui, Wang, Gang, Chen, Zheng, Ma, Teng, Liu, Hong, Dhungana, Singha R., Huss, Sarah E., Yang, Xiping, Sharma, Anupma, Trujillo, Jhon H., Martinez, Maria C., Hudson, Matthew, Riascos, John J., Schuler, Mary, Chen, Li-Qing, Braun, David M., Li, Lei, Yu, Qingyi, Wang, Jianping, Wang, Kai, Schatz, Michael C., Heckerman, David, Van Sluys, Marie-Anne, Souza, Glaucia Mendes, Moore, Paul H., Sankoff, David, VanBuren, Robert, Paterson, Andrew H., Nagai, Chifumi, and Ming, Ray
- Abstract
Modern sugarcanes are polyploid interspecific hybrids, combining high sugar content from Saccharum officinarumwith hardiness, disease resistance and ratooning of Saccharum spontaneum. Sequencing of a haploid S. spontaneum, AP85-441, facilitated the assembly of 32 pseudo-chromosomes comprising 8 homologous groups of 4 members each, bearing 35,525 genes with alleles defined. The reduction of basic chromosome number from 10 to 8 in S. spontaneumwas caused by fissions of 2 ancestral chromosomes followed by translocations to 4 chromosomes. Surprisingly, 80% of nucleotide binding site-encoding genes associated with disease resistance are located in 4 rearranged chromosomes and 51% of those in rearranged regions. Resequencing of 64 S. spontaneumgenomes identified balancing selection in rearranged regions, maintaining their diversity. Introgressed S. spontaneumchromosomes in modern sugarcanes are randomly distributed in AP85-441 genome, indicating random recombination among homologs in different S. spontaneumaccessions. The allele-defined Saccharumgenome offers new knowledge and resources to accelerate sugarcane improvement.
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- 2018
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13. Probabilistic Degenerate Fubini Polynomials Associated with Random Variables
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Xu, Rongrong, Kim, Taekyun, Kim, Dae San, and Ma, Yuankui
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Let Ybe a random variable such that the moment generating function of Yexists in a neighborhood of the origin. The aim of this paper is to study probabilistic versions of the degenerate Fubini polynomials and the degenerate Fubini polynomials of order r, namely the probabilisitc degenerate Fubini polynomials associated with Yand the probabilistic degenerate Fubini polynomials of order rassociated with Y. We derive some properties, explicit expressions, certain identities and recurrence relations for those polynomials. As special cases of Y, we treat the gamma random variable with parameters α,β>0, the Poisson random variable with parameter α>0, and the Bernoulli random variable with probability of success p.
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- 2024
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14. Acute effects of exposure to fine particulate matter and ozone on lung function, inflammation and oxidative stress in healthy adults.
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Xu, Rongrong, Li, Zhigang, Zhu, Xiaojing, Guo, Chen, Su, Qiaoqiao, Peng, Jianhao, Wang, Zhanshan, Qian, Yan, Li, Xiaoqian, Xu, Qiujin, and Wei, Yongjie
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LUNGS ,AIR pollutants ,PARTICULATE matter ,OXIDATIVE stress ,AIR quality monitoring stations ,OZONE ,YOUNG adults - Abstract
Both fine particulate matter (PM 2.5) and ozone (O 3) may have adverse effects on human health. However, previous studies on the effects of air pollutants mainly have focused on susceptible population, and evidence on healthy young adults is limited. We aimed to examine the associations of the two main air pollutants (PM 2.5 and O 3) with lung function, inflammation and oxidative stress in healthy young adults. We recruited 30 healthy young adults for a longitudinal panel study in Beijing and implemented health examination seven times, including lung function (FEV 1 and PEF) and biomarkers of inflammation and oxidative stress (i.e. C-reactive protein, CRP; interleukin-6, IL-6; malondialdehyde, MDA) from December 2019 to May 2021. Hourly ambient air pollutants data were obtained from the closest air quality monitoring station. Linear mixed-effect model was applied to explore the associations between air pollutants and lung function, inflammation and oxidative stress. We observed higher PM 2.5 exposure was associated with decrement in lung function and increment in CRP and MDA. Each 10 μg/m
3 increase in PM 2.5 (lag 2 day) is associated with a 17.06 ml (95% CI: −31.53, −2.58) decrease in FEV 1 , 46.34 ml/s (95% CI: −76.41, −16.27) decrease in PEF and increments of 2.86% (95% CI: 1.47%, 4.27%) in CRP, 1.63% (95% CI: 0.14%, 3.14%) in MDA respectively. However, there is no significant association between ozone exposure and health indicators. The study suggested that short-term exposure to PM 2.5 may decrease lung function and induce inflammation and oxidative stress in healthy adults, but there is no association between O 3 and each outcome. • PM 2.5 exposure decreased lung function in young healthy adults. • PM 2.5 exposure was associated with evaluated inflammation and oxidative stress. • Ambient ozone may have less harmful effects on healthy adults working indoors. [ABSTRACT FROM AUTHOR]- Published
- 2022
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15. Berberine inhibited the formation of metastasis by intervening the secondary homing of colorectal cancer cells in the blood circulation to the lung and liver through HEY2.
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Ni, Lulu, Sun, Ping, Ai, Min, Kong, Lingzhong, Xu, Rongrong, and Li, Jiangan
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Background: Metastasis is the leading cause of death in patients with colorectal cancer (CRC). The 5-year survival rate of CRC patients in whom the cancer has spread to distant sites is 13.5%. The most common sites of CRC metastasis are liver and lung. The principal therapies for CRC metastatic disease are surgery, but its benefits are limited.Purpose: This study aimed to reveal the regulatory mechanism of berberine on secondary homing of CRC cells to form metastatic focus. This was more valuable than the previous direct study of the migration and metastasis characteristics of CRC cells.Methods: In this study, we used the functional enrichment analysis of differentially expressed genes after berberine treatment and investigated co-expression modules related with CRC metastasis by WGCNA. PPI and survival analyses of significant modules were also conducted. The biological functions of berberine in CRC lung and liver metastasis were investigated by a series of in vitro and in vivo experiments: MTT, colony formation and mouse tail vein injection. And we scanned through the entire extracellular domain of HEY2 protein for autodocking analysis with berberine.Results: We found the differentially expressed genes (DEGs) after berberine treatment were related with cancer progression and metastasis related pathways. Through WGCNA analysis, four cancer progression and metastasis related modules were detected. After PPI and survival analysis, we identified and validated HEY2 as a hub gene, high expression and poor survival at the metastatic stage. Functionally, berberine inhibited the survival, invasion and migration of CRC cells in vitro and in vivo. Mechanistically, berberine treatment down-regulated the expression of HEY2, metastasis related protein E-cadherin, β-catenin and Cyclin D1 during Mesenchymal epithelial transformation (MET). Berberine and HEY2 showed a significant interaction, and berberine binded to HEY2 protein at the residue HIS-99 interface with a hydrogen-bond distance of 1.9A.Conclusions: We revealed that berberine could significantly inhibit the expression of hub gene HEY2 and metastasis related proteins E-cadherin and β-catenin and Cyclin D1 during MET in CRC lung and liver metastases. In total, HEY2 was a promising candidate biomarker for prognosis and molecular characteristics in CRC metastasis. [ABSTRACT FROM AUTHOR]- Published
- 2022
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16. Effect of chloride ion introduction on structural and 1.5?μm emission properties in Er^3+-doped fluorophosphate glass
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Tian, Ying, Xu, Rongrong, Hu, Lili, and Zhang, Junjie
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Effects of chloride ion introduction on structural and 1.5?μm emission properties in Er^3+-doped fluorophosphate have been investigated. The structural changes revealed by the measured Raman spectra indicate that the chloride ions have an important influence on the phonon density of host glasses. With increasing chloride content, the phonon density of fluorophosphate glasses decreases. The chloride modified fluorophosphate glasses possessing higher thermal stability are suitable for broadband amplifier fiber fabrication. Desirable thermal resistance properties and spectroscopic characteristics of Er^3+-doped chloride fluorophosphate glass indicate that it is a promising material for 1.5?μm lasers.
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- 2011
17. Diffraction characteristics of spatial and temporal Gaussian-shaped femtosecond laser pulse by rectangle reflection grating
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Liu, Guohua, Xu, Rongrong, Yu, Wenbing, and Wu, Hanping
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The exact intensity distribution expression for the spatial and temporal Gaussian-shaped femtosecond laser pulse diffracted by a rectangle reflection grating is derived. The spatial and temporal diffraction characteristics are theoretically investigated in detail, and a criterion for judging whether or not the diffraction pulse is just split into two independent pulses in the temporal domain is obtained. The results show that the diffraction intensity in the temporal domain consists of three parts: the intensity diffracted by the upper reflection surface of the grating, the intensity diffracted by the nether reflection surface, and their temporal coherent intensity. The temporal coherent intensity becomes weaker, even is zero, for the higher height from the nether surface to the upper surface of the grating. The principal maximum becomes more sharply bright for the bigger waist width of the femtosecond laser pulse in the spatial domain.
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- 2011
18. Ion-exchange controlled surface engineering of cobalt phosphide nanowires for enhanced hydrogen evolution.
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Xu, Rongrong, Jiang, Tengfei, Fu, Zheng, Cheng, Ningyan, Zhang, Xingxiu, Zhu, Kun, Xue, Huaiguo, Wang, Wenjun, Tian, Jingqi, and Chen, Peng
- Abstract
Transition metal phosphides are promising alternatives to the precious metal catalysts for various electrocatalysis applications. Controllable and precise surface engineering of electrocatalysts is the key challenge to enhance their performance. Herein, we demonstrate an ion-exchange strategy to produce cobalt phosphide nanowires which have a conductive core and a thickness-controlled surface layer with sulfur dopants, phosphorus vacancies, and amorphous domains. They are applied for hydrogen evolution reaction with high stability, achieving a current density of 100 mA cm
-2 at an overpotential of 114 mV. Based on both comprehensive state-of-the-art experimental characterizations and theoretical investigations, the excellent catalytic performance is attributed to increased active sites, facilitated charge transfer and transport, as well as weakened H adsorption and strengthened H 2 O adsorption due to the synergistic effects of S dopants and P vacancies. A controllable surface-layer-confined doping strategy to engineer the surface composition and structure of cobalt phosphide nanowire arrays based on an ion-exchange mechanism is developed toward superior electrocatalytic hydrogen evolution. Image 1 • A controllable ion-exchange strategy to produce sulfur doped-cobalt phosphide nanowires (S-CoP) has been developed. • S-CoP has conductive core and thickness-controlled surface layer with sulfur dopants, phosphorus vacancies, and amorphous domains. • S-CoP can achieve the current density of 100 mA cm-2 at a low overpotential of 114 mV, much is lower than that of CoP (η 100 = 134 mV). • We demonstrate a new strategy to precisely engineer a nanostructured catalyst based on state-of-the-art experimental characterization and theoretical analyses. • Mechanistic insights on interplays between dopants, vacancies and active centers have been provided. [ABSTRACT FROM AUTHOR]- Published
- 2020
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19. The combination of Ilexhainanoside D and ilexsaponin A1 reduces liver inflammation and improves intestinal barrier function in mice with high-fat diet-induced non-alcoholic fatty liver disease.
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Zhao, Wenwen, Xiao, Meng, Yang, Jie, Zhang, Li, Ba, Yinying, Xu, Rongrong, Liu, Zongyang, Zou, Haiyan, Yu, Ping, Wu, Xia, and Chen, Xiaoqing
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Background: Non-alcoholic fatty liver disease (NAFLD) is becoming a major health concern worldwide. Ilex hainanensis Merr. extract was proved to have anti-inflammation effect on NAFLD, and Ilexhainanoside D (IhD) and ilexsaponin A1 (IsA) were the main triterpenoid saponins extracted from it.Purposes: To investigate the hepatoprotective effect of the combination of IhD and IsA (IIC) against NAFLD and discuss the potential mechanisms.Methods: Male C57BL/6 mice were fed a high-fat diet (HFD) to induce NAFLD and were treated with IIC (60, 120 or 240 mg/kg) for 8 weeks. Growth parameters, abdominal fat content, serum biochemical markers, hepatic lipid accumulation and insulin tolerance were assessed. Quantitative real-time PCR was used to determine the hepatic gene expression of TLR2, TLR4, TNF-α, IL-6, and IL-1β. Western blot analysis was performed to determine the expression of the epidermal tight junction proteins ZO-1 and occludin. Gut microbiota profiles were established via high-throughput sequencing of the V3-V4 region of the bacterial 16S rRNA gene.Results: IIC significantly reduced the severity of NAFLD induced by HFD in a dose-dependent manner. IIC decreased the ratio of Firmicutes/Bacteroidetes, reduced the relative abundance of Desulfovibrio and increased the relative abundance of Akkermansia. The intestinal barrier was improved as evidenced by the upregulation of the expression of ZO-1 and occludin in the ileum. IIC thus reduced the entry of LPS into the circulation and decreased the hepatic gene expression levels of proinflammatory cytokines.Conclusion: This approach demonstrated the positive effects of IIC in a mouse model of NAFLD, indicating that it possibly acts by reducing inflammation and improving the intestinal barrier function. [ABSTRACT FROM AUTHOR]- Published
- 2019
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20. Ion-exchange controlled surface engineering of cobalt phosphide nanowires for enhanced hydrogen evolution
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Xu, Rongrong, Jiang, Tengfei, Fu, Zheng, Cheng, Ningyan, Zhang, Xingxiu, Zhu, Kun, Xue, Huaiguo, Wang, Wenjun, Tian, Jingqi, and Chen, Peng
- Abstract
Transition metal phosphides are promising alternatives to the precious metal catalysts for various electrocatalysis applications. Controllable and precise surface engineering of electrocatalysts is the key challenge to enhance their performance. Herein, we demonstrate an ion-exchange strategy to produce cobalt phosphide nanowires which have a conductive core and a thickness-controlled surface layer with sulfur dopants, phosphorus vacancies, and amorphous domains. They are applied for hydrogen evolution reaction with high stability, achieving a current density of 100 mA cm-2at an overpotential of 114 mV. Based on both comprehensive state-of-the-art experimental characterizations and theoretical investigations, the excellent catalytic performance is attributed to increased active sites, facilitated charge transfer and transport, as well as weakened H adsorption and strengthened H2O adsorption due to the synergistic effects of S dopants and P vacancies.
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- 2020
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21. Intense 2.7 μm and broadband 2.0 μm emission from diode-pumped Er^3+/Tm^3+/Ho^3+-doped fluorophosphate glass
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Tian, Ying, Xu, Rongrong, Hu, Lili, and Zhang, Junjie
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This Letter reports intense emission at 2.7 μm and broadband emission at 2.0 μm from Er^3+/Tm^3+/Ho^3+-doped fluorophosphate glass. The fluorescence characteristics and energy transfer upon excitation of a conventional 980 nm laser diode are investigated. Based on the fluorescence spectra and lifetime measurement, the effect of Tm^3+ and Ho^3+ ions on intense 2.7 μm emission in fluorophosphate glass is demonstrated. It is also found that the effective bandwidth of 2.0 μm emission due to Tm^3+ and Ho^3+ ions can reach as high as 196 nm. These results indicate that the advantageous spectroscopic characteristics of Er^3+/Tm^3+/Ho^3+ triply doped fluorophosphate glass together with the outstanding thermal properties may become an attractive host for the mid-IR solid state lasers.
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- 2011
22. Enhanced emission of 2.7?μm pumped by laser diode from Er^3+/Pr^3+-codoped germanate glasses
- Author
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Xu, Rongrong, Tian, Ying, Hu, Lili, and Zhang, Junjie
- Abstract
A novel Er^3+/Pr^3+ codoped germanate glass was fabricated and analyzed. Efficient emission at 2.7?μm from the glass was observed upon excitation of a conventional 980?nm laser diode. The 2.7?μm emission characteristics and energy transfer (ET) were investigated. Population inversions between I_13/24 and I_11/24 levels have been achieved, and an enhanced emission from 2550 to 2800?nm was obtained. Large ET efficiency of 95% indicates that the ET process from Er^3+ to Pr^3+(I4_13/2,H3_4)?(I4_15/2,F3_3) is efficient and that Pr^3+ can enhance the emission of 2.7?μm by quenching the lower laser level of Er^3+ via ET.
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- 2011
23. Observation of 2.7μm emission from diode-pumped Er^3+/Pr^3+-codoped fluorophosphate glass
- Author
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Tian, Ying, Xu, Rongrong, Zhang, Liyan, Hu, Lili, and Zhang, Junjie
- Abstract
This work reports the intense emission at 2.7μm in a Er^3+/Pr^3+-codoped fluorophosphate (FP) host glass. This FP glass shows good thermal stability and high transmittance around 3μm. The emission characteristic and energy transfer upon excitation of a conventional 980nm laser diode are investigated. The prepared glass possesses higher spontaneous transition probability (22.16s^−1) along with a larger calculated emission cross section (6.57±0.11)×10^−21cm^2 corresponding to the laser transition ^4I_11/2?^4I_13/2. In addition, the effect of Pr^3+ codoping on the 2.7μm photoluminescence in FP glass is demonstrated. Hence, the advantageous spectroscopic characteristics of Er^3+/Pr^3+-codoped FP glass together with the outstanding thermal property indicate that this kind of glass may become an attractive host for developing solid-state lasers at around 2.7μm.
- Published
- 2011
24. Publisher Correction: Allele-defined genome of the autopolyploid sugarcane Saccharum spontaneumL
- Author
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Zhang, Jisen, Zhang, Xingtan, Tang, Haibao, Zhang, Qing, Hua, Xiuting, Ma, Xiaokai, Zhu, Fan, Jones, Tyler, Zhu, Xinguang, Bowers, John, Wai, Ching Man, Zheng, Chunfang, Shi, Yan, Chen, Shuai, Xu, Xiuming, Yue, Jingjing, Nelson, David R., Huang, Lixian, Li, Zhen, Xu, Huimin, Zhou, Dong, Wang, Yongjun, Hu, Weichang, Lin, Jishan, Deng, Youjin, Pandey, Neha, Mancini, Melina, Zerpa, Dessireé, Nguyen, Julie K., Wang, Liming, Yu, Liang, Xin, Yinghui, Ge, Liangfa, Arro, Jie, Han, Jennifer O., Chakrabarty, Setu, Pushko, Marija, Zhang, Wenping, Ma, Yanhong, Ma, Panpan, Lv, Mingju, Chen, Faming, Zheng, Guangyong, Xu, Jingsheng, Yang, Zhenhui, Deng, Fang, Chen, Xuequn, Liao, Zhenyang, Zhang, Xunxiao, Lin, Zhicong, Lin, Hai, Yan, Hansong, Kuang, Zheng, Zhong, Weimin, Liang, Pingping, Wang, Guofeng, Yuan, Yuan, Shi, Jiaxian, Hou, Jinxiang, Lin, Jingxian, Jin, Jingjing, Cao, Peijian, Shen, Qiaochu, Jiang, Qing, Zhou, Ping, Ma, Yaying, Zhang, Xiaodan, Xu, Rongrong, Liu, Juan, Zhou, Yongmei, Jia, Haifeng, Ma, Qing, Qi, Rui, Zhang, Zhiliang, Fang, Jingping, Fang, Hongkun, Song, Jinjin, Wang, Mengjuan, Dong, Guangrui, Wang, Gang, Chen, Zheng, Ma, Teng, Liu, Hong, Dhungana, Singha R., Huss, Sarah E., Yang, Xiping, Sharma, Anupma, Trujillo, Jhon H., Martinez, Maria C., Hudson, Matthew, Riascos, John J., Schuler, Mary, Chen, Li-Qing, Braun, David M., Li, Lei, Yu, Qingyi, Wang, Jianping, Wang, Kai, Schatz, Michael C., Heckerman, David, Van Sluys, Marie-Anne, Souza, Glaucia Mendes, Moore, Paul H., Sankoff, David, VanBuren, Robert, Paterson, Andrew H., Nagai, Chifumi, and Ming, Ray
- Abstract
In the version of this article originally published, the accession codes listed in the data availability section were incorrect and the section was incomplete. The text for this section should have read “The genome assembly and gene annotation have been deposited in the NCBI database under accession number QVOL00000000, BioProject number PRJNA483885 and BioSample number SAMN09753102. The data can also be downloaded from the following link: http://www.life.illinois.edu/ming/downloads/Spontaneum_genome/.” The errors have been corrected in the HTML and PDF versions of the article.
- Published
- 2018
- Full Text
- View/download PDF
25. Effect of chloride ion introduction on structural and 1.5?μm emission properties in Er^3+-doped fluorophosphate glass: publisher’s note
- Author
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Tian, Ying, Xu, Rongrong, Hu, Lili, and Zhang, Junjie
- Abstract
In [J. Opt. Soc. Am. B28, 1638 (2011)] the wrong version of Fig. 4 was published; a duplicate of Fig. 1 was given. The figure has been corrected online as of September 26, 2011: http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab‐28‐7‐1638.
- Published
- 2011
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