Peng Cui

King Abdullah University of Science and Technology, Djidda, Makkah, Saudi Arabia

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Publications (136)364.7 Total impact

  • Peng Cui, Chao Zeng, Yu Lei
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    ABSTRACT: A miniaturized flume experiment was carried out to measure impact forces of viscous debris flow. The flow depth (7.2–11.2 cm), velocity (2.4–5.2 m/s) and impact force were recorded during the experiment. The impact process of debris flow can be divided into three phases by analyzing the variation of impact signals and flow regime. The three phases are the sudden strong impact of the debris flow head, continuous dynamic pressure of the body and slight static pressure of the tail. The variation of impact process is consistent with the change in the flow regime. The head has strong–rapid impact pressure, which is shown as a turbulent-type flow; the body approximated to be a steady laminar flow. Accordingly, the process of debris flows hitting on structures was simplified to a triangle shape, ignoring the pressure of the tail. In order to study the distribution of the debris flow impact force at different depths and the variation of impact process over time, the impact signals of slurry and coarse particles were separated from the original signals with Wavelet analysis. The slurry's dynamic pressure signal appears to be a smooth curve, and the peak pressure is 12–34 kPa when the debris flow head hit the sensors, which is about 1.54 ± 0.36 times the continuous dynamic pressure of debris flow body. The limit application of the empirical parameter α of hydraulic formula was also noted. We introduced the power function relationship of α and the Froude number of debris flows, and proposed a universal model for calculating dynamic pressure. The impact pressure of large particles has the characteristic of randomness. The mean frequency of large particles impacting on the sensor is 210 ± 50–287 ± 29 times per second, and it is 336 ± 114–490 ± 69 times per second for the debris flow head, which is greater than that in the debris flow body. Peak impact pressure of particles at different flow depths is 40–160 kPa, which is 3.2 ± 1.5 times the impact pressure of the slurry at the bottom of flow, 3.1 ± 0.9 times the flow in the middle, and 3.3 ± 0.9 times the flow at the surface. The differences of impact frequency indicate that most of the large particles concentrate in the debris flow head, and the number of particles in the debris flow head increases with height. This research can supports the study of solid–liquid two phase flow mechanisms, and helps engineering design and risk assessment in the debris flow prone area. This article is protected by copyright. All rights reserved.
    Earth Surface Processes and Landforms 03/2015; DOI:10.1002/esp.3744 · 2.70 Impact Factor
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    ABSTRACT: MicroRNAs (miRNAs) play crucial roles in multiple stages of plant development and regulate gene expression at posttranscriptional and translational levels. In this study, we first identified 238 conserved miRNAs in date palm (Phoenix dactylifera) based on a high-quality genome assembly and defined 78 fruit-development-associated (FDA) miRNAs, whose expression profiles are variable at different fruit development stages. Using experimental data, we subsequently detected 276 novel P. dactylifera-specific FDA miRNAs and predicted their targets. We also revealed that FDA miRNAs function mainly in regulating genes involved in starch/sucrose metabolisms and other carbon metabolic pathways; among them, 221 FDA miRNAs exhibit negative correlation with their corresponding targets, which suggests their direct regulatory roles on mRNA targets. Our data define a comprehensive set of conserved and novel FDA miRNAs along with their expression profiles, which provide a basis for further experimentation in assigning discrete functions of these miRNAs in P. dactylifera fruit development.
    Genomics 01/2015; 105(4). DOI:10.1016/j.ygeno.2015.01.004 · 2.79 Impact Factor
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    ABSTRACT: Over 240 debris flows occurred in hill-slopes, gullies ( indicated those with single-channel) and watersheds (indicated those with tributaries and channels) on July 10th 2013 in the Wenchuan county, and caused 29 casualties and about 633×106 USD losses. This work aimed to analyze characteristics, hazards and causes of these events and explore mitigating measures based on field investigation and remote sensing images interpretation. The debris flows contained clay content of 0.1%∼3.56%, having densities of 1.72∼2.14 t/m3, velocities of 5.0∼12.7 m/s, discharges of 335∼2353 m3/s and sediment yields of 0.10∼1.26×106 m3, and also numerously occurred in large watersheds with the area over 10 km2. Large debris flows formed 3 hazard-chains in slopes, gullies, watersheds and rivers, which all evolved in dammed lakes and outburst flood, and 26 dammed lakes and 10 newly ones were generated along the rivers of Min and Yuzi. The remarkable spatial difference of loose solid materials accumulation and intense rainfall, with the cumulative of about or more than 150 mm and the hourly of over 16mm, caused debris flows in the sections from Yingxiu to Miansi and Gengda. The damages on buildings, reconstructions, highways, factories and hydro power station originated from the impacting, scouring, burying of debris flows, the submerging of dammed lake and the scouring of outburst flood, and the huge losses came from the ruinous destructions of control engineering works of debris flows as well as the irrational location and low-resistant capabilities of reconstructions. For hazards mitigating of debris flows in long term, the feasible measures for short term, including risk-reassessing of foregone and potential hazard sites, regional alarming system establishing and integrated control in disastrous sites, and middle-long term, including improving reconstruction standard, rationally disposing river channel bed rise and selecting appropriate reconstruction time and plans, were strongly suggested.
    Journal of Mountain Science 01/2015; 12(1):186-206. DOI:10.1007/s11629-014-3100-7 · 0.76 Impact Factor
  • Landslides 01/2015; DOI:10.1007/s10346-014-0553-2 · 2.81 Impact Factor
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    ABSTRACT: In present paper, 3D finite element (FE) method is used to determine plastic limit load solutions for pipe bends under combined bending and torsion moment. With a detailed analysis and comparison, a common awareness for loading effect is showing which will raise researchers concern. By the way, past solutions are not appropriate to estimate FE results. In this respect of finite element analysis, overall yielding considering the spread process of yield region from crown to the straight pipe shows these promising finite element results. A wide range of non-dimensional parameters for pipe bends are considered and plastic limit load solutions are suggested. The results show that r/t is the main factor affecting the limit loads. Plastic limit load is independent on the loading path and material constants by normalizing. Results show that the circular interaction rule is a great approximation for pipe bends under combined bending and torsion moment. A series of approaches are confirmed in order to validate our finite element method on plastic limit analysis. Based on the finite element results, approximate plastic limit load solutions are proposed. Present work will further improve the limit load solution for pipe bends under complex loading conditions.
    International Journal of Mechanical Sciences 12/2014; 92. DOI:10.1016/j.ijmecsci.2014.12.011 · 2.06 Impact Factor
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    ABSTRACT: debris flows occurred in Wenjia Gully was studied through large flume model test•mechanisms of landslide dam failures in Wenjia Gully were studied•dynamic process of flows along an erosive sloping channel was investigated
    Engineering Geology 11/2014; DOI:10.1016/j.enggeo.2014.10.021 · 1.76 Impact Factor
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    ABSTRACT: Prevention works should not be built 3 to 5 years after an earthquake.•A new debris flow prevention method was put forth.•New prevention techniques are developed for post-earthquake debris flow.•A case study was carried out in the Wenchuan earthquake area.
    Engineering Geology 10/2014; DOI:10.1016/j.enggeo.2014.10.002 · 1.76 Impact Factor
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    ABSTRACT: An Ms7.0 earthquake, focal depth 13 km, struck Lushan on April 20, 2013, caused 196 deaths and 21 missing, 13,484 injuries, and affected more than two million people. A field investigation was taken immediately after the quake, and the induced hazards were analyzed in comparison with the Wenchuan earthquake. We have identified 1,460 landslides and avalanches and four dammed lakes, which were generally small and concentrated on high elevation. Avalanches and rockfalls developed in cliffs and steep slopes of hard rocks, including Jinjixia of Baosheng Town and Dayanxia of Shuangshi Town, Lushan, and the K317 section the Xiaoguanzi section north to Lingguan Town along the provincial highway S210. Landslides were relatively less, mainly in moderate and small scales, developing in sandstone, shale, and loose colluviums. Only one single large landslide was observed to turn into debris slide-flow. Dammed lakes were formed by avalanches and landslides, all in small size and of low danger degree. The earthquake-induced hazards distributed in belt on the hanging wall along the faults, and their major controlling factors include tectonics, lithology, structure surface, and landform. More than 99 % landslides were within 30 km to the epicenter, and 678 within 10 km, accounting for 46 % of the total; about 50 % landslides were distributed on slopes between 35° and 55°, and 11 % on slope exceeding 75°; 60 % on slopes at the altitudes between 1,000 and 1,500 m, 77 % on slopes between 900 and 1,500 m; and 24 and 62 % in hard rocks and section between hard and soft rocks, respectively. Compared with the case of Wenchuan earthquake, both the number and extension of landslides and avalanches in Lushan earthquake-affected area are much smaller, only 5.53 % in number and 0.57 % in area. The earthquake has increased the instability of slope and potentiality of landslide and debris flow. Accordingly, the active period is expected to be relatively short comparing with that in Wenchuan earthquake-hit area. However, the insidious and concealed hazards bring difficulty for risk investigation.
    Natural Hazards 09/2014; 73(2). DOI:10.1007/s11069-014-1100-0 · 1.96 Impact Factor
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    ABSTRACT: The formation of landslide dams is often induced by earthquakes in mountainous areas. The failure of a landslide dam typically results in catastrophic flash floods or debris flows downstream. Significant attention has been given to the processes and mechanisms involved in the failure of individual landslide dams. However, the processes leading to domino failures of multiple landslide dams remain unclear. In this study, experimental tests were carried out to investigate the domino failure of landslide dams and the consequent enlargement of downstream debris flows. Different blockage conditions were considered, including complete blockage, partial blockage and erodible bed (no blockage). The mean velocity of the flow front was estimated by videos. Total stress transducers (TSTs) and Laser range finders (LRFs) were employed to measure the total stress and the depth of the flow front, respectively. Under a complete blockage pattern, a portion of the debris flow was trapped in front of each retained landslide dam before the latter collapsed completely. This was accompanied by a dramatic decrease in the mean velocity of the flow front. Conversely, under both partial blockage and erodible bed conditions, the mean velocity of the flow front increased gradually downward along the sloping channel. Domino failures of the landslide dams were triggered when a series of dams (complete blockage and partial blockage) were distributed along the flume. However, not all of these domino failures led to enlarged debris flows. The modes of dam failures have significant impacts on the enlargement of debris flows. Therefore, further research is necessary to understand the mechanisms of domino failures of landslide dams and their effects on the enlargement of debris flows.
    International Journal of Sediment Research 09/2014; 29(3):414–422. DOI:10.1016/S1001-6279(14)60055-X · 0.72 Impact Factor
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    ABSTRACT: Melanoma is the most malignant cutaneous cancer and causes over 9,000 deaths annually. Because fatality rates from malignant melanoma (MM) increase dramatically upon metastasis, we investigated tumorigenesis and metastasis of MM in transcriptome analyses of three distinct cell lines that correspond with the stages of MM pathogenesis: the normal stage (HEMn-LP), the onset of MM (A375), and the metastasis stage (A2058). Using next-generation sequencing (NGS) technology, we detected asymmetrical expression of genes among the three cell lines, notably on chromosomes 9, 12, and 14, suggesting their involvement in tumorigenesis and metastasis of MM. These genes were clustered into 41 categories based on their expression patterns, and their biological functions were analyzed using Ingenuity Pathway Analysis. In the top cancer-associated category, HIF1A, IL8, TERT, ONECUT1, and FOXA1 directly interacted with either transcription factors or cytokines that are known to be involved in the tumorigenesis or metastasis of other malignant tumors. The present data suggest that cytokine regulatory pathways in macrophages predominate over other pathways during the pathogenesis of MM. This study provides new targets for the downstream mechanistic studies of the tumorigenesis and metastasis of MM and demonstrates a new strategy for studies of the progression of other malignant cancers.
    Gene 07/2014; 548(2). DOI:10.1016/j.gene.2014.07.038 · 2.08 Impact Factor
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    ABSTRACT: Background Translational selection is a ubiquitous and significant mechanism to regulate protein expression in prokaryotes and unicellular eukaryotes. Recent evidence has shown that translational selection is weakly operative in highly expressed genes in human and other vertebrates. However, it remains unclear whether translational selection acts differentially on human genes depending on their expression patterns. Results Here we report that human housekeeping (HK) genes that are strictly defined as genes that are expressed ubiquitously and consistently in most or all tissues, are under stronger translational selection. Conclusions These observations clearly show that translational selection is also closely associated with expression pattern. Our results suggest that human HK genes are more efficiently and/or accurately translated into proteins, which will inevitably open up a new understanding of HK genes and the regulation of gene expression. Reviewers This article was reviewed by Yuan Yuan, Baylor College of Medicine; Han Liang, University of Texas MD Anderson Cancer Center (nominated by Dr Laura Landweber) Eugene Koonin, NCBI, NLM, NIH, United States of America Sandor Pongor, International Centre for Genetic Engineering and biotechnology (ICGEB), Italy.
    Biology Direct 07/2014; 9(1):17. DOI:10.1186/1745-6150-9-17 · 4.04 Impact Factor
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    ABSTRACT: Cerebrum postnatal development is a complicated biological process precisely controlled by multiple genes. To understand the molecular mechanism of cerebrum development, we compared dynamics of mouse cerebrum transcriptome through three developmental stages using high-throughput RNA-seq technique. Three libraries were generated from mouse cerebrum at infancy, adolescence and adulthood, respectively. Consequently, 44,557,729 (infancy), 59,257,530 (adolescence) and 72,729,636 (adulthood) reads were produced, which were assembled into 15,344, 16,048 and 15,775 genes, respectively. We found that the overall gene expression level increased from infancy to adolescence and decreased later on upon reaching adulthood. The adolescence cerebrum has the most active gene expression, with expression of a large number of regulatory genes up-regulated and some crucial pathways activated. Transcription factors (TFs) analysis suggested the similar dynamics as expression profiling, especially those TFs functioning in neurogenesis differentiation, oligodendrocyte lineage determination and circadian rhythms regulation. Moreover, our data revealed drastic increase of myelin basic protein (MBP)-coding gene expression in adolescence and adulthood, suggesting that brain myelin may be generated since mouse adolescence. In addition, differential gene expression analysis indicated the activation of rhythmic pathway, suggesting the function of rhythmic movement since adolescence; Furthermore, Furthermore, during infancy and adolescence periods, gene expression related to axonrepulsion and attraction showed the opposite trends, indicating that axon repulsion was activated after birth, while axon attraction might be activated at the embryonic stage and declined during the postnatal development. Our results from the present study may shed light on the molecular mechanism underlying the postnatal development of mammalian cerebrum.
    Genomics Proteomics & Bioinformatics 06/2014; 12(3). DOI:10.1016/j.gpb.2014.04.004
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    ABSTRACT: BackgroundAlternative splicing (AS) of precursor mRNA (pre-mRNA) is an important gene regulation process that potentially regulates many physiological processes in plants, including the response to abiotic stresses such as salt stress.ResultsTo analyze global changes in AS under salt stress, we obtained high-coverage (~200 times) RNA sequencing data from Arabidopsis thaliana seedlings that were treated with different concentrations of NaCl. We detected that ~49% of all intron-containing genes were alternatively spliced under salt stress, 10% of which experienced significant differential alternative splicing (DAS). Furthermore, AS increased significantly under salt stress compared with under unstressed conditions. We demonstrated that most DAS genes were not differentially regulated by salt stress, suggesting that AS may represent an independent layer of gene regulation in response to stress. Our analysis of functional categories suggested that DAS genes were associated with specific functional pathways, such as the pathways for the responses to stresses and RNA splicing. We revealed that serine/arginine-rich (SR) splicing factors were frequently and specifically regulated in AS under salt stresses, suggesting a complex loop in AS regulation for stress adaptation. We also showed that alternative splicing site selection (SS) occurred most frequently at 4 nucleotides upstream or downstream of the dominant sites and that exon skipping tended to link with alternative SS.ConclusionsOur study provided a comprehensive view of AS under salt stress and revealed novel insights into the potential roles of AS in plant response to salt stress.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2164-15-431) contains supplementary material, which is available to authorized users.
    BMC Genomics 06/2014; 15(1):431. DOI:10.1186/1471-2164-15-431 · 4.04 Impact Factor
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    ABSTRACT: Buildings are the element of greatest concern with regard to debris flow hazard risk, and their destruction is mainly caused by the collapse of walls and reinforced concrete (RC) columns. This research classifies the failure modes of the columns in a typical beam–column-framed building based on field investigations and historical data. It also proposes the collapse mechanism for columns damaged by debris flow, with reference to their failure modes. Based on the collapse mechanism, three typical types of RC columns with different strengths, which are usually used in many mountainous areas of Western China, were selected for the damage analysis. The critical velocity of debris flow and the diameter of particles were obtained using theories of material and structural mechanics. The results showed that the critical bearing condition of columns can be indicated by the formation of plastic hinges along columns and by the shear damage in the column section. The development of plastic hinges was mainly determined by the debris flow velocity and diameter and the impact location of large boulders. The energy of viscous debris flow is much larger than that of the dilute flow, and there will be more severe damage for columns under viscous flow impact. The critical velocities for three plastic hinge collapses are about twice those of two plastic hinge collapses. If the diameter of the boulders is larger than 0.5 m, the impact force of the large boulders plays a major role in the column collapse. Otherwise, both the dynamic pressure of debris flow and the impact force of boulders are responsible for column failure. Finally, the critical condition of column failure was applied to Zhouqu’s debris flow hazard. The calculated critical velocity is consistent with the value given by field investigation, which implies that this study can be used for risk analysis and damage estimation in a debris-flow-prone area.
    Landslides 06/2014; 12(3). DOI:10.1007/s10346-014-0490-0 · 2.81 Impact Factor
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    ABSTRACT: The ECERIFERUM9 (CER9) gene encodes a putative E3 ubiquitin ligase that functions in cuticle biosynthesis and maintenance of plant water status. Here we found that CER9 is also involved in abscisic acid (ABA) signaling in seeds and young seedlings. The germinated embryos of the mutants exhibited enhanced sensitivity to ABA during transition from reversible dormancy to determinate seedling growth. Expression of the CER9 gene is closely related to ABA levels and displays a similar pattern to that of ABI5, which encodes a positive regulator of ABA responses in seeds. cer9 mutant seeds exhibited delayed germination that is independent of seed coat permeability. Quantitative proteomic analyses showed that cer9 seeds had a protein profile similar to that of the wild type treated with ABA. Transcriptomics analyses revealed that genes involved in ABA biosynthesis or signaling pathways were differentially regulated in cer9 seeds. Consistent with this, high levels of ABA were detected in dry seeds of cer9. Blocking ABA biosynthesis by fluridone treatment or by combining an ABA-deficient mutation with cer9 attenuated the phenotypes of cer9. Whereas introduction of the abi1-1, abi3-1 or abi4-103 mutations could completely eliminate the ABA hypersensitivity of cer9, introduction of abi5 resulted only in partial suppression. These results indicate that CER9 is a novel negative regulator of ABA biosynthesis and the ABA signaling pathway during seed germination.
    Plant physiology 05/2014; 165(3). DOI:10.1104/pp.114.239699 · 7.39 Impact Factor
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    ABSTRACT: In areas hit by the 2008 Wenchuan earthquake that occurred in Sichuan Province, China, debris flows are often generated from landslide deposits during heavy rainstorms. The broadly graded and unconsolidated landslide deposits respond to rainfall in very complex mechanical and hydraulic manners. An artificial rainfall test was conducted to simulate the rainfall infiltration and surface runoff processes occurring on the landslide deposit slope at the Wenjiagou Gully, China, with heavy rainfall rates (140 mm/h) incorporated. An innovative flume was designed to collect the slope interflow and surface runoff separately. Sensors to monitor the pore water content (PWP) and volumetric water content (VWC) were deployed. The results indicated that there were four stages in the hydrological response of landslide deposits during the artificial rain event: infiltration, a slow increase in interflow (surface runoff begins), a rapid increase in interflow (surface runoff slowly increases) and a steady state. Bed gradient increase will lead to PWP rapidly ascending and regressive failure happening. Concomitant with the observed increases in PWP and VWC, the shear strength of the landslide deposits decreased and led to the occurrence of small-scale shallow failures. Surface runoff, interflow and fine particle migration effects are presented to interpret the process of shallow failure. And although shallow slope failure is the result of interaction with the above three factors induced by rainfall, the key underlying factor is the characteristically loose structure of landslide deposits.
    Engineering Geology 05/2014; 180. DOI:10.1016/j.enggeo.2014.04.009 · 1.76 Impact Factor
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    ABSTRACT: Sm-like proteins are highly conserved proteins that form the core of the U6 ribonucleoprotein and function in several mRNA metabolism processes, including pre-mRNA splicing. Despite their wide occurrence in all eukaryotes, little is known about the roles of Sm-like proteins in the regulation of splicing. Here, through comprehensive transcriptome analyses, we demonstrate that depletion of the Arabidopsis supersensitive to abscisic acid and drought 1 gene (SAD1), which encodes Sm-like protein 5 (LSm5), promotes an inaccurate selection of splice sites that leads to a genome-wide increase in alternative splicing. In contrast, overexpression of SAD1 strengthens the precision of splice-site recognition and globally inhibits alternative splicing. Further, SAD1 modulates the splicing of stress-responsive genes, particularly under salt-stress conditions. Finally, we find that overexpression of SAD1 in Arabidopsis improves salt tolerance in transgenic plants, which correlates with an increase in splicing accuracy and efficiency for stress-responsive genes. We conclude that SAD1 dynamically controls splicing efficiency and splice-site recognition in Arabidopsis, and propose that this may contribute to SAD1-mediated stress tolerance through the metabolism of transcripts expressed from stress-responsive genes. Our study not only provides novel insights into the function of Sm-like proteins in splicing, but also uncovers new means to improve splicing efficiency and to enhance stress tolerance in a higher eukaryote.
    Genome biology 01/2014; 15(1):R1. DOI:10.1186/gb-2014-15-1-r1 · 10.47 Impact Factor
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    ABSTRACT: Declining vegetation coverage caused by serious soil erosion in dry-hot river valley of the Jinsha River has resulted in a vicious cycle of environmental deterioration and aggravated soil erosion. In order to identify the relationship between vegetation succession and transformation of soil erosion, the methods of “space replacing time” and 137Cs technique have been used to analyze community structure of vegetation and distribution characteristics of 137Cs contents in the slopes and vegetation units of five succession stages, which included native grassland, shrub, sapling forest, half-mature forest and near mature forest in Jiangjiagou gully, Dongchuan city, Yunnan province. We found, during the course of succession, the number of species in communities increased with vegetation development and succession, but the 137Cs loss decreased with vegetation succession. Following the succession, near mature forest had the highest 137Cs inventory and native grassland had the lowest 137Cs inventory in both slopes and vegetation units. Principal component analysis showed that 137Cs inventory was significantly positively correlated with average crown diameter of tree (ACDT), species number, tree coverage and average tree height. Average crown diameter of shrub (ACDS) and average shrub height were also positively related to 137Cs inventory but to a lesser extent. Based on the results of our study, we illustrated the improvement of soil erosion control through soil conservation and water regulation with vegetation succession. Consequently, the results suggest that community features significantly affect soil erosion, through which we can evaluate and predict the soil erosion intensity of different vegetation.
    Ecological Engineering 01/2014; 62:13–26. DOI:10.1016/j.ecoleng.2013.10.020 · 3.04 Impact Factor
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    ABSTRACT: Green tea is a promising chemopreventive agent for lung cancer. Multiple signaling events have been reported, however, the relative importance of these mechanisms in mediating the chemopreventive function of green tea is unclear. In the present study, to examine the involvement of AP-1 in green tea polyphenols induced tumor inhibition, human NSCLC cell line H1299 and mouse SPON 10 cells were identified as AP-1 dependent, as these two lines exhibit high constitutive AP-1 activity, and when TAM67 expression was induced with doxycycline, cell growth was inhibited and correlated with suppressed AP-1 activity. RNA-seq was used to determine the global transcriptional effects of AP-1 inhibition and also uncover the possible involvement of AP-1 in tea polyphenols induced chemoprevention. TAM67 mediated changes in gene expression were identified, and within down-regulated genes, AP-1 was identified as a key transcription regulator. RNA-seq analysis revealed that Polyphenon E-treated cells shared 293 commonly down-regulated genes within TAM67 expressing H1299 cells, and by analysis of limited Chip-seq data, over 10% of the down-regulated genes contain a direct AP-1 binding site, indicating that Polyphenon E elicits chemopreventive activity by regulating AP-1 target genes. Conditional TAM67 expressing transgenic mice and NSCLC cell lines were used to further confirm that the chemopreventive activity of green tea is AP-1 dependent. Polyphenon E lost its chempreventive function both in vitro and in vivo when AP-1 was inhibited, indicating that AP-1 inhibition is a major pathway through which green tea exhibits chemopreventive effects. © 2013 Wiley Periodicals, Inc.
    Molecular Carcinogenesis 01/2014; 53(1):19-29. DOI:10.1002/mc.21941 · 4.77 Impact Factor
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    ABSTRACT: A12OC ceramic powder was successfully synthesized via a carbothermal reduction method using Al2O3, B2O3 and activated carbon powders as raw materials. The effects of synthesis temperature on the phase transformation and micro-morphology of A12OC were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the content of A12OC in the products was increased with the increasing heating temperature. The optimized process for preparing A12OC was heating the mixtures at 1700 °C for 2 h in argon flow. A12OC particles synthesized at 1700 °C were hexagon plate-like with thickness of 5 μm and size of about 50 μm. Keywords: A12OC, synthesis, microstructure
    01/2014; 881-883:1017-1020. DOI:10.4028/www.scientific.net/AMR.881-883.1017

Publication Stats

4k Citations
364.70 Total Impact Points

Institutions

  • 2013–2015
    • King Abdullah University of Science and Technology
      • Department of Environmental Science and Engineering
      Djidda, Makkah, Saudi Arabia
  • 2014
    • Nanjing University of Technology
      Nan-ching, Jiangsu Sheng, China
  • 2013–2014
    • Wuhan University of Science and Technology
      Wu-han-shih, Hubei, China
  • 2012–2014
    • Medical College of Wisconsin
      • Department of Pharmacology and Toxicology
      Milwaukee, Wisconsin, United States
  • 2004–2014
    • Beijing Genomics Institute
      Bao'an, Guangdong, China
  • 2012–2013
    • North China University of Water Conservancy and Electric Power
      Cheng, Henan Sheng, China
  • 2008–2013
    • National Space Science
      Peping, Beijing, China
  • 2002–2013
    • Chinese Academy of Sciences
      • • Institute of Mountain Hazards and Environment
      • • Graduate School
      • • Institute of Zoology
      • • Institute of Computing Technology
      Peping, Beijing, China