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  1. 14 Polish Journal of Environmental Studies

  2. 4 Acta Physiologiae Plantarum

  3. 3 Acta Protozoologica

  4. 2 Cellular and Molecular Biology Letters

  5. 1 Archivum Immunologiae et Therapiae Experimentalis

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  1. 30 Xu D.

  2. 8 Wu Z.

  3. 6 Zhou Q.

  4. 5 Zhang Y.

  5. 4 He F.

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  1. 1 2020

  2. 6 2019

  3. 4 2018

  4. 4 2017

  5. 1 2016

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1

Dome-basin structure and its influence on coal and gas outbursts

100%
Xu D., Guo D.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 4
Coal and gas outbursts are extremely violent dynamic disasters. Geological structure is the primary factor for controlling outbursts, and dome-basin structure is one of the most dangerous structural types that are prone to cause outbursts. This study reveals the reasons for and characteristics of coal and gas outbursts in a dome-basin structure. According to the analysis of the features and the formation mechanism of a dome-basin structure, combining gas geology theory and gas geology parameters, coal seam characteristics of stress and strain, coal-body structure, and coal seam gas occurrences in a domebasin structure were studied. Based on the change laws of the above three aspects, the influences of domebasin structure on coal and gas outburst was also further analyzed. The results show that the dome-basin structure can be divided into three parts: dome structure, basin structure, and saddle structure. In the saddle structure, the surrounding rock was greatly damaged and the elasticity of the rock strata increased. It is easy to incur tectonic stress concentration. The type of coal-body structure is most of the mylonitic coal of full-layer thickness, and decreased the destruction-resisting ability of a coal seam. Coal seam gas content and pressure are relatively large, and provided beneficial conditions for the coal and gas outburst. Because of these effects, the probability of coal and gas outbursts visibly increased in this area.
2

Hapantotypification and morphological redescription of the marine planktonic ciliate, Spirostrombidium cinctum [Kahl, 1932] Petz, Song et Wilbert, 1995 [Ciliophora: Pligotrichida]

100%
Xu D., Song W.
Acta Protozoologica
|
2006
|
tom 45
|
nr 1
3

How temperature affects wastewater nitrate removal in a bioelectrochemically assisted constructed wetland system

85%
Xu D., Xiao E., Xu P., Zhou Y., Zhou Q., Xu D., Wu Z.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 2
A novel bioelectrochemically assisted constructed wetland system (BECW) was investigated using a laboratory-scale experimental apparatus for treating nitrate-contaminated water without an organic carbon source. The BECW was operated at 29 ±1 and 18 ±1ºC, respectively, to explore the effects of temperature on the autotrophic denitrification process. The results showed that higher TN removal efficiency (76.30 ±5.08%) was obtained at higher temperature when compared to a lower temperature (48.18 ±4.40%). The effluent concentrations of NO₂⁻-N and NH₄⁺-N at 18 ±1ºC were 0.40 ±0.11 and 0.50 ±0.42 mg N L⁻¹, whereas those at 29 ±1ºC could be neglected. Besides, significant accumulations of NO₂⁻-N and NH₄⁺-N were observed in the cathode region at 18 ±1ºC through quantifying different forms of nitrogen that varied along the flow path.
4

The evolutionary role of the IL-33/ST2 system in host immune defence

81%
Sattler S., Smits H. H., Xu D., Huang F.-P.
Archivum Immunologiae et Therapiae Experimentalis
|
2013
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tom 61
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nr 2
5

Dynamics of sandy desertification and detection of sandy land-steppe boundary: vegetation and soil properties

81%
Xu D., Xu X., Xie Y., Wang K.
Polish Journal of Ecology
|
2012
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tom 60
|
nr 2
Desertification is one of the most serious environmental problems on a global scale. China suffers from desertification over large areas. Landscape boundaries profoundly influence the structure and function of landscapes, and influence ecological processes both locally and over large scales. Data on soil properties and vegetation collected on three 110 km parallel transects across sandy land-steppe transition zone in Yanchi county, Ningxia region, northwestern China, were used to analyze changes along the sandy land/steppe boundary by using the Moving Split Window (MSW), to determine desertification dynamics, and to explore changes of vegetation and soil properties among different desertification degree. Combining the dissimilarity profiles of soil particle size with importance value (IV) of vegetation, four boundaries were detected along transects. According to the four boundaries, we divided the whole sandy land/steppe ecotone area into five desertification categories: potential desertification (PD), light desertification (LD), medium desertification (MD), severe desertification (SD) and extreme desertification (ED). Sand fractions increased, while silt and clay fractions, soil organic C, total N and available N decreased and exhibited clear gradient changes from the potential desertification land to the extreme desertification land. All areas we studied have been desertificated at different degree based upon soil particle compositions at different depths. With the aggravation of sandy desertification, the steppe species dominating in the potential desertification land gradually gave place to arid and sand tolerant perennials and therophytes and eventually to psammophyte annuals and shrubs in the extreme desertification land.
6

Recent progress, opportunities and challenges in collaborative learning and orchestrating creativity

81%
Chen J., Gao X., Yan L., Xu D.
World Scientific News
|
2015
|
tom 09
7
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Recent progress in monoaromatic pollutants removal from groundwater through bioremediation

81%
Chen J., Gao X., Yan L., Xu D.
International Letters of Natural Sciences
|
2015
|
tom 07
Monoaromatic pollutants such as benzene, toluene, ethylbenzene and mixture of xylenes are now considered as widespread contaminants of groundwater. In situ bioremediation under natural attenuation or enhanced remediation has been successfully used for removal of organic pollutants, including monoaromatic compounds, from groundwater. Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water. However, engineering bioremediation is faster and more efficient. Also, studies have shown that enhanced anaerobic bioremediation can be applied for many BTEX contaminated groundwaters, as it is simple, applicable and economical.This paper reviews microbiology and metabolism of monoaromatic biodegradation and in situ bioremediation for BTEX removal from groundwater under aerobic and anaerobic conditions. It also discusses the factors affecting and limiting bioremediation processes and interactions between monoaromatic pollutants and other compounds during the remediation processes.
8

Two new marine species of Pseudovorticella [Ciliophora, Peritrichia] from Qingdao, North China

81%
Sun P., Song W., Xu D.
Acta Protozoologica
|
2007
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tom 46
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nr 1
9

On two marine oligotrich ciliates, Spirostrombidium agathae n. sp. and S. schizostomum [Kahl, 1932] n. comb. from China, with a key to the identification of seven well-characterized Spirostrombidium spp. [Ciliophora: Oligotrichida]

81%
Xu D., Song W., Lin X., Warren A.
Acta Protozoologica
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2006
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tom 45
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nr 4
10

How artificial aeration improved sewage treatment of an integrated vertical-flow constructed wetland

71%
Tao M., He F., Xu D., Li M., Wu Z.
Polish Journal of Environmental Studies
|
2010
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tom 19
|
nr 1
183-191
Artificial aeration was added to an integrated vertical-flow constructed wetland (called aerated IVCW hereafter) for improving water purification performance. The results showed that both oxygen levels and aerobic zones were increased in the wetland substrates. The electric potential (Eh) profiling demonstrated that artificial aeration maintained the pattern of sequential oxic-anoxic-oxic redox zones within the aerated IVCW chambers in winter, while only two oxic-anoxic zones were present inside the non-aerated IVCW in the cold seasons. The nitrification/denitrification processes and organic matter decomposition were enhanced by artificial aeration since the removal efficiency of NH₄⁺-N and BOD₅ were significantly improved in all seasons, particularly in winter. It seemed that artificial aeration could compensate for the absence of plant-mediated oxygen supply, though the low temperatures and plant dieback still affected the removal efficiency of COD and TN in the winter. Eight hours of artificial aeration per day was sufficient to eliminate the significant accumulation of NO₃⁻-N previously observed in the effluent from continuously aerated subsurface-flow constructed wetlands. These results suggest that the aerated IVCW could treat domestic sewage more efficiently, especially in winter.
11

Microcystin-LR regulates circadian clock and antioxidant gene expression in cultured rat cardiomyocytes

71%
Wu Y., Wang X., Xu D., Guo Y., Wu J.
Cellular and Molecular Biology Letters
|
2018
|
tom 23
Background: Microcystins are waterborne environmental toxins that induce oxidative stress and cause injuries in the heart. On the other hand, many physiological processes, including antioxidant defense, are under precise control by the mammalian circadian clock. Results: In the present study, we evaluated the effect of microcystin-LR (MC-LR) on the rhythmic expression patterns of circadian and antioxidant genes in rat cardiomyocytes using the serum shock technique. We found that a non-toxic dose (10 μm) of MC-LR decreased the amplitudes of rhythmic patterns of clock genes, while it increased the expression levels of antioxidant genes. Conclusions: Our results indicate an influence of MC-LR on the circadian clock system and clock-controlled antioxidant genes, which will shed some light on the explanation of heart toxicity induced by MC-LR from the viewpoint of chronobiology.
12

Heterologous expression of Populus euphratica CPD (PeCPD) can repair the phenotype abnormity caused by inactivated AtCPD through restoring brassinosteroids biosynthesis in Arabidopsis

71%
Wu H., Si J., Xu D., Lian G., Wang X.
Acta Physiologiae Plantarum
|
2014
|
tom 36
|
nr 12
To get insights into the functional difference of CPD (constitutive photomorphogenesis and dwarfism) between herb and woody plants, a full-length Populus euphratica L. cDNA homologous to Arabidopsis thaliana CPD (AtCPD), named PeCPD, was introduced to Arabidopsis thaliana cpd mutant (CM) and corresponding wild type (WT), resulting in a series of CM-PeCPD and WT-PeCPD transgenic lines. All the CM-PeCPD lines differentially displayed evident restoration in phenotype and fertility compared to cpd mutant, but still showed differences from WT in some respects. All the WT-PeCPD lines displayed obvious overexpression phenotype compared to WT plants. The transcription levels (TLs) of PeCPD in the CM-PeCPD lines were positively correlated, and that in the WT-PeCPD lines uncorrelated, with the level of their phenotype restoration/change. In the CM-PeCPD lines, the TLs of AtDWF4, AtBR6OX2 and AtTCH4 were negatively, and of AtBAS1 and AtSAUR-AC1 positively correlated with PeCPD TLs, whereas in the WT-PeCPD lines, their TLs were uncorrelated, and positively or negatively correlated to PeCPD TLs. The level of total endogenous BRs was basically negatively correlated to the level of phenotype restoration/change and PeCPD TLs in the PeCPD transgenic plants. The findings indicate that PeCPD also plays important role in regulation of plant growth and development through participating in BR biosynthesis.
13

Effective removal of humic acid using strontium-doped TiO2 coated on porous ceramic filter media in water resource

71%
Tung T. X., Xu D., Zhang Y., Zhou Q., Wu Z.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 6
A photocatalyst comprised of strontium-doped TiO₂ coated on porous ceramic filter media (Sr-TiO₂/PCFM) was prepared using the heat-treated process. The main objective of this study was to investigate the effects of catalyst dosage, initial HA concentrations, pH, and temperature on the adsorption and degradation of humic acid (HA) in a solution containing Sr-TiO₂/PCFM under irradiation of UV light. Removal efficiency of 84.25% for HA was achieved under experimental conditions for a Sr-TiO₂/PCFM dosage of 80 g at an initial concentration of 15 mg/L over a period of 8 h. Higher degradation was found for HA in the acidic environment and at higher operating temperatures. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and Langmuir isotherm models. The oxidation rate constants of HA were evaluated by using pseudo first-order kinetics that can describe the photodegradation process. Furthermore, the photocatalytic stability of Sr-TiO₂/PCFM was performed with 3 cycles reused. These findings suggest that the Sr-TiO₂/PCFM was found to be an effective and promising approach to eliminating HA in water resources.
14

Removing humic acid from aqueous solution using titanium dioxide: a review

71%
Tung T. X., Xu D., Zhang Y., Zhu Q., Wu Z.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 2
Recently, the photocatalytic degradation technique with titanium dioxide (TiO₂) has been widely applied for the degradation of humic acid (HA) from aqueous solution due to its ability to achieve complete mineralization of organic contaminants. Because TiO₂ is the most commonly used semiconductor photocatalyst, efforts on the modification of TiO₂ in order to improve catalyst efficiency were presented in this review manuscript. The key photoreactor operation parameters such as TiO₂ loading, pH, temperature, oxygen concentration, concentration and nature of HA, light wavelength, light intensity, the presence of inorganic ions and mechanistic pathway for pollutant removal, and the formation of the intermediates and their effects on the mineralization and disinfection of the photo-process were also assessed. Although we can see an increase in the number of papers that have been published in this area, further progress is needed to improve the understanding of the dynamic interactions between TiO₂ photocatalytic oxidation process and HA, as well as to suggest possible future developments in this promising field.
15

Mitigation of wastewater-borne chorpyrifos in constructed wetlands: an ecological suitability assessment by nacrophyte and microbial responses

61%
Wang C., Liu B., Xu D., Zhang L., He F., Zhou Q., Wu Z.
Polish Journal of Environmental Studies
|
2017
|
tom 26
|
nr 3
Plants and microorganisms are the main biotic compartments for phytoaccumulation and metabolic transformation of organic contaminants in constructed wetlands (CWs). However, how they cope with special pollutants during the treatment process has not been well characterized. In this study, responses of Iris pseudoacorus (I. pseudoacorus) and microbial communities were intensively investigated in pilot-scale CWs treating wastewater-borne chlorpyrifos, an organic phosphorus pesticide. Chlorpyrifos was associated with inhibited plant growth, decreased photosynthetic activity, and a significant increase in oxidative products. Superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities were affected by chlorpyrifos, whereas catalase (CAT) activity was almost unaffected. Although chlorpyrifos stimulated the antioxidant system, there was little indication of oxidative damage in I. pseudoacorus. Urease, β-glucosidase, and phosphatase activities in substrate were elevated by 73.73%, 17.20%, and 16.23%, respectively, which may indicate enhancement of nitrogen, carbon, and phosphorus cycling. Fatty acid methyl ester (FAME) profiles showed that aerobic prokaryotes, which are likely the functional group responsible for chlorpyrifos degradation, increased from 16.37% to 31.32% after chlorpyrifos addition. Biomarkers for fungal/bact and trans/cis remained unchanged after the chlorpyrifos addition, suggesting that chlorpyrifos did not negatively influence the substrate microbial communities in CWs.
16

Predictions of select control organic pollutant removal in subsurface flow wetlands

61%
Xu D., Shi Y., Duan Y., Wang Y., You Y., Yang A., Hou Y.
Polish Journal of Environmental Studies
|
2015
|
tom 24
|
nr 6
17

Effects of oxytetracycline on growth and chlorophyll fluorescence in rape (Brassica campestris L.)

61%
Chen Y., Wang Z., Shen Z., Ou Z., Xu D., Yuan Z., Zhou S.
Polish Journal of Environmental Studies
|
2017
|
tom 26
|
nr 3
This study aims to investigate the effects of oxytetracycline on growth and photosynthetic capacity of rape (Brassica campestris L.). Four levels of oxytetracycline (0, 10, 100, and 200 mg kg⁻¹) were added to the potted soil. Chlorophyll fluorescence parameters induced by five levels (90, 190, 420, 820, and 1,500 μmol photons m⁻² s⁻¹) of PAR (PAR, photosynthetically active radiation) were measured. Plant growth indices and leaf traits were also determined. Electron transport rate increased along with the increase of PAR, but an opposite trend was found for the effective quantum yield of PSII. The quantum yield of light-induced non-photochemical fluorescence quenching in higher oxytetracycline treatments (100 and 200 mg kg⁻¹) gradually increased when PAR increased from 90 to 820 μmol photons m⁻² s⁻¹, but then declined under higher PAR gradients. The fractions of quantum yield of non-light-induced non-photochemical fluorescence quenching in PSII were significantly higher in all the oxytetracycline treatments than in the control. Oxytetracycline exposure was also found to alter the energy distribution in the photosynthetic electron transport chain. This study showed that oxytetracycline exposure evidently diminished the photosynthetic capacity of rape, which was further supported by the observations that growth indices and leaf traits were significantly inhibited by oxytetracycline.
18
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Influence of paclobutrazol on the growth and photosynthesis of Sequoia sempervirens seedlings

61%
Ju S., Xu D., Zhan C., Ji L., Yin T., Li Z., Lu Z.
Journal of Horticultural Research
|
2019
|
tom 27
|
nr 1
19

Mitigation of wastewater-borne chlorpyrifos in constructed wetlands: the role of vegetation on partitioning

61%
Wang C., Liu B., Xu D., Zhang D., He F., Zhou Q., Wu Z.
Polish Journal of Environmental Studies
|
2017
|
tom 26
|
nr 1
Constructed wetlands (CWs) are regarded as a risk mitigation strategy for alleviating the risks associated with agricultural runoff that contains pesticides. We investigated the partitioning pattern of wastewater-borne chlorpyrifos, a widely used organophosphorus pesticide, in non-vegetated and vegetated CWs. Removal rates of chlorpyrifos calculated from inflow and outflow concentrations ranged from 87.65% to 96.57%. The average removal rate was significantly higher and more stable in vegetated CWs than in non-vegetated CWs. As determined using a mass-balance method, outflows, macrophytes, substrate micro-degradation, and ”other” accounted for 5.23%, 22.7%, 15.96%, and 56.11%, respectively, of the chlorpyrifos in the vegetated system. Of all Iris pseudoacorus organs examined, the rhizome was dominant in biomass and gathered the largest amount of chlorpyrifos. Except for the uptake of chlorpyrifos by plants, the primary difference between vegetated and non-vegetated CWs was that there was a relatively low potential for chlorpyrifos micro-degradation and volatilization and photolysis in vegetated CWs than in non-vegetated CWs. Identification of this partitioning pattern elucidates the mechanisms underlying chlorpyrifos removal from wastewater in CWs.
20

Melatonin improves antioxidant capacity and ion homeostasis and enhances salt tolerance in maize seedlings

61%
Jiang C., Cui Q., Feng K., Xu D., Li C., Zheng Q.
Acta Physiologiae Plantarum
|
2016
|
tom 38
|
nr 04
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