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[PMID]: 28922900
[Au] Autor:Asmare Y; Hopkins RJ; Tekie H; Hill SR; Ignell R
[Ad] Address:Department of Zoological Sciences, Addis Ababa University, PO. Box 1176, Addis Ababa, Ethiopia.
[Ti] Title:Grass Pollen Affects Survival and Development of Larval Anopheles arabiensis (Diptera: Culicidae).
[So] Source:J Insect Sci;17(5), 2017 Sep 01.
[Is] ISSN:1536-2442
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Nutrients in breeding sites are critical for the survival and development of malaria mosquitoes, having a direct impact on vectorial capacity. Yet, there is a limited understanding about the natural larval diet and its impact on the individual fitness of mosquitoes. Recent studies have shown that gravid Anopheles arabiensis Patton (Diptera: Culicidae) are attracted by and oviposit in grass-associated habitats. The pollen provided by these grasses is a potential source of nutrients for the larvae. Here, we assess the effect of Typha latifolia L. (Poales: Typhaceae), Echinochloa pyramidalis Lamarck, Pennisetum setaceum Forsskål, and Zea mays L. pollen on larval survival and rate of development in An. arabiensis under laboratory conditions. In addition, we characterize the carbon to nitrogen ratio and the size of pollen grains as a measure of diet quality. Carbon-rich pollen with a small grain size (T. latifolia and P. setaceum; 9.7 ± 0.3 × 103 and 5.5 ± 0.2 × 104 µm3, respectively) resulted in enhanced rates of development of An. arabiensis. In contrast, the larva fed on the nitrogen-rich control diet (TetraMin) was slower to develop, but demonstrated the highest larval survival. Larvae fed on carbon-rich and large-grained Z. mays pollen (4.1 ± 0.2 × 105 µm3) survived at similar levels as those fed on the control diet and also took a longer time to develop compared with larvae fed on the other pollens. While males and females did not appear to develop differently on the different pollen diets, males consistently emerged faster than their female counterparts. These results are discussed in relation to integrated vector management.
[Mh] MeSH terms primary: Anopheles/physiology
Diet
Longevity
Nutritive Value
Poaceae
Pollen/chemistry
Typhaceae/chemistry
[Mh] MeSH terms secundary: Animals
Anopheles/growth & development
Female
Larva/growth & development
Male
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1710
[Cu] Class update date: 171017
[Lr] Last revision date:171017
[Js] Journal subset:IM
[Da] Date of entry for processing:170920
[St] Status:MEDLINE
[do] DOI:10.1093/jisesa/iex067

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[PMID]: 28890992
[Au] Autor:Chen C; Zhao T; Liu R; Luo L
[Ad] Address:Agricultural Clean Watershed Innovation Group, Institute of Environment and Sustainable Development in Agriculture, CAAS; Key Laboratory for Agricultural Environment MOA, Beijing, 100081, China.
[Ti] Title:Performance of five plant species in removal of nitrogen and phosphorus from an experimental phytoremediation system in the Ningxia irrigation area.
[So] Source:Environ Monit Assess;189(10):497, 2017 Sep 10.
[Is] ISSN:1573-2959
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Agricultural non-point source (ANPS) pollution is an important contributor to elevated nitrogen (N) and phosphorus (P) in surface waters, which can cause serious environmental problems. Considerable effort has therefore gone into the development of methods that control the ANPS input of N and P to surface waters. Phytoremediation has been extensively used because it is cost-effective, environmentally friendly, and efficient. The N and P loads from agricultural drainage are a potential threat to the water quality of the Yellow River in Ningxia, China. Yet, phytoremediation has only rarely been applied within the Ningxia irrigation area. In an experimental set-up, five species (Ipomoea aquatica, IA; Lactuca sativa, LS; Oryza sativa, OS; Typha latifolia, TL; Zizania latifolia, ZL) were evaluated for their ability to reduce N and P loads over 62 days and five observation periods. Total N and P concentrations, plant biomass, and nutrient content were measured. The results showed that OS, LS, and IA performed better than ZL and TL in terms of nutrients removal, biomass accumulation, and nutrients storage. The highest overall removal rates of N and P (57.7 and 57.3%, respectively) were achieved by LS treatment. In addition, plant uptake contributed significantly to nutrient removal, causing a 25.9-72.0% reduction in N removal and a 54.3-86.5% reduction in P removal. Thus, this study suggests that OS, LS, and IA would be more suitable than ZL and TL for controlling nutrient loads in the Ningxia irrigation area using phytoremediation.
[Mh] MeSH terms primary: Nitrogen/metabolism
Phosphorus/metabolism
Plants/metabolism
Water Pollution/prevention & control
[Mh] MeSH terms secundary: Agricultural Irrigation/standards
Biodegradation, Environmental
Biomass
China
Environmental Monitoring
Eutrophication
Ipomoea/metabolism
Lettuce/metabolism
Nitrogen/analysis
Oryza/metabolism
Phosphorus/analysis
Plants/classification
Poaceae/metabolism
Random Allocation
Rivers
Typhaceae/metabolism
Water Quality
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:27YLU75U4W (Phosphorus); N762921K75 (Nitrogen)
[Em] Entry month:1711
[Cu] Class update date: 171113
[Lr] Last revision date:171113
[Js] Journal subset:IM
[Da] Date of entry for processing:170912
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-6213-y

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[PMID]: 28870210
[Au] Autor:Yan X; Zhao Y; Luo J; Xiong W; Liu X; Cheng J; Wang Y; Zhang M; Qu H
[Ad] Address:School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, 100029, China.
[Ti] Title:Hemostatic bioactivity of novel Pollen Typhae Carbonisata-derived carbon quantum dots.
[So] Source:J Nanobiotechnology;15(1):60, 2017 Sep 05.
[Is] ISSN:1477-3155
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:BACKGROUND: Pollen Typhae Carbonisata (PTC) is a type of calcined herb drug that has been used as a hemostatic medicine to promote hemostasis for thousands of years. In this study, we discovered and separated novel water-soluble carbon quantum dots (CQDs, named PTC-CQDs) from aqueous extracts of PTC. These PTC-CDs were characterized using transmission electron microscopy (TEM) and high-resolution TEM, as well as Fourier transform infrared, ultraviolet-visible, and fluorescence spectroscopy. Then, we assessed the anti-hemorrhagic effects and related hemostatic mechanisms of the obtained PTC-CQDs. RESULTS: The PTC-CQDs separated from PTC are spherical, monodisperse, and have a narrow size distribution between 2 and 8 nm. In the pharmacology experiment, remarkable anti-hemorrhage effects of PTC-CQDs were revealed. Additionally, the rats showed a profound decrease in activated partial thromboplastin time and increase in fibrinogen and PLT after PTC-CQDs treatment. CONCLUSIONS: These results indicated the explicit hemostasis effect of PTC-CQDs, which not only provided a new idea for the material research of PTC, but have also provided new insights into potential biomedical and healthcare applications of CQDs in the field of haemorrhage control and laid a solid foundation for future drug discovery.
[Mh] MeSH terms primary: Carbon/therapeutic use
Drugs, Chinese Herbal/therapeutic use
Hemorrhage/drug therapy
Hemostatics/therapeutic use
Pollen
Quantum Dots/therapeutic use
Typhaceae
[Mh] MeSH terms secundary: Animals
Blood Coagulation/drug effects
Carbon/chemistry
Carbon/pharmacology
Charcoal/chemistry
Charcoal/pharmacology
Charcoal/therapeutic use
Drugs, Chinese Herbal/chemistry
Drugs, Chinese Herbal/pharmacology
Hemorrhage/blood
Hemostatics/chemistry
Hemostatics/pharmacology
Male
Mice
Pollen/chemistry
Quantum Dots/chemistry
Rats
Rats, Sprague-Dawley
Typhaceae/chemistry
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Drugs, Chinese Herbal); 0 (Hemostatics); 16291-96-6 (Charcoal); 7440-44-0 (Carbon)
[Em] Entry month:1709
[Cu] Class update date: 170913
[Lr] Last revision date:170913
[Js] Journal subset:IM
[Da] Date of entry for processing:170906
[St] Status:MEDLINE
[do] DOI:10.1186/s12951-017-0296-z

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[PMID]: 28841517
[Au] Autor:Berry P; Yassin F; Grosshans R; Lindenschmidt KE
[Ad] Address:School of Environment and Sustainability, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, Saskatchewan, S7N 3H5, Canada. Electronic address: pamela.berry@usask.ca.
[Ti] Title:Surface water retention systems for cattail production as a biofuel.
[So] Source:J Environ Manage;203(Pt 1):500-509, 2017 Dec 01.
[Is] ISSN:1095-8630
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Surface water retention systems act to reduce nutrient pollution by collecting excess nutrients within a watershed via runoff. Harvesting aquatic biomass, such as the invasive cattail, from retention systems removes nutrients absorbed by the plant from the ecosystem permanently. Harvested biomass can be used as a renewable energy source in place of fossil fuels, offsetting carbon emissions. The purpose of this research was to simulate cattail harvest from surface water retention systems to determine their ability to provide suitable growing conditions with annual fluctuations in water availability. The economic and environmental benefits associated with nutrient removal and carbon offsets were also calculated and monetized. A proposed upstream and existing downstream water retention system in southern Manitoba were modelled using a system dynamics model with streamflow inputs provided by a physical hydrologic model, Modélisation Environmentale Communautaire - Surface and Hydrology (MESH). Harvesting cattail and other unconventional feedstocks, such as reeds, sedges, and grasses, from retention systems provided a viable revenue stream for landowners over a ten-year period. This practice generates income for landowners via biomass and carbon credit production on otherwise underutilized marginal cropland invaded with cattail. The economic benefits promote wetland habitat restoration while managing cattail growth to maintain biodiversity. Excess nitrogen and phosphorus are also removed from the ecosystem, reducing downstream nutrient loading. Utilizing surface water retention systems for cattail harvest is a best management strategy for nutrient retention on the landscape and improving agricultural resilience.
[Mh] MeSH terms primary: Biofuels
Typhaceae
[Mh] MeSH terms secundary: Biomass
Nitrogen
Phosphorus
Water Movements
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Biofuels); 27YLU75U4W (Phosphorus); N762921K75 (Nitrogen)
[Em] Entry month:1711
[Cu] Class update date: 171113
[Lr] Last revision date:171113
[Js] Journal subset:IM
[Da] Date of entry for processing:170826
[St] Status:MEDLINE

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[PMID]: 28614741
[Au] Autor:Cui H; de Angelis MH; Schröder P
[Ad] Address:Research Unit Environmental Genomics, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstaedter Landstr. 1, 85764 Neuherberg, Germany.
[Ti] Title:Iopromide exposure in Typha latifolia L.: Evaluation of uptake, translocation and different transformation mechanisms in planta.
[So] Source:Water Res;122:290-298, 2017 Oct 01.
[Is] ISSN:1879-2448
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Iopromide is frequently detected in water bodies due to its widespread use as an X-ray contrast agent in medicine. Due to its rapid clearance from the human body and its incomplete removal by wastewater treatment, an elevation of its concentration in the environment is observed that might lead to a serious impact on human and environmental health. Alternative or additional removal technologies may be more effective to remove iopromide from the effluents of wastewater treatment facilities, like phytoremediation with aquatic macrophytes. To test this, a hydroponic experiment was carried out to assess the fate of iopromide in Typha latifolia. The transformation products (TPs) in the plant were investigated to predict possible transformation mechanisms. The removal process followed first order kinetics with a linear regression R value of 0.983. The iopromide concentration in roots and rhizomes reached a maximum value of 20.70 ± 0.81 and 16.82 ± 1.78 nmol g on the 7th day, respectively, thereafter decreased until the end of experiment. A different result was found in leaves, where iopromide concentration decreased over the whole experimental period. A total of eight transformation products were detected in T. latifolia, including 23 isomers. The relative content of aldehyde and ketone TPs decreased in roots and rhizomes while the relative content of carboxylic TPs increased. However, the relative content of aldehyde and ketone TPs only showed a slight decrease in leaves while the relative content of carboxylic TPs remained stable during the experimental period. In addition, a significant increase of decarboxylated TPs was found in leaves, but not in roots and rhizomes. These results indicate that a difference in transformation mechanisms exists among plant tissues. The findings of this study are important to better understand the transformation mechanisms of iopromide in plants and to improve phytoremediation technologies for such kind of compounds.
[Mh] MeSH terms primary: Contrast Media/pharmacokinetics
Iohexol/analogs & derivatives
Typhaceae
Water Pollutants, Chemical/pharmacokinetics
[Mh] MeSH terms secundary: Biodegradation, Environmental
Humans
Iohexol/pharmacokinetics
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Contrast Media); 0 (Water Pollutants, Chemical); 4419T9MX03 (Iohexol); 712BAC33MZ (iopromide)
[Em] Entry month:1710
[Cu] Class update date: 171013
[Lr] Last revision date:171013
[Js] Journal subset:IM
[Da] Date of entry for processing:170615
[St] Status:MEDLINE

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[PMID]: 28550783
[Au] Autor:Wang Q; Kelly BC
[Ad] Address:Department of Civil and Environmental Engineering, National University of Singapore, Singapore.
[Ti] Title:Occurrence, distribution and bioaccumulation behaviour of hydrophobic organic contaminants in a large-scale constructed wetland in Singapore.
[So] Source:Chemosphere;183:257-265, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:This study involved a field-based investigation to assess the occurrence, distribution and bioaccumulation behaviour of hydrophobic organic contaminants in a large-scale constructed wetland. Samples of raw leachate, water and wetland plants, Typha angustifolia, were collected for chemical analysis. Target contaminants included polychlorinated biphenyls (PCBs), organochlorine pesticides (OCP), as well as several halogenated flame retardants (HFRs) and personal care products (triclosan and synthetic musks). In addition to PCBs and OCPs, synthetic musks, triclosan (TCS) and dechlorane plus stereoisomers (syn- and anti-DPs) were frequently detected. Root concentration factors (log RCF L/kg wet weight) of the various contaminants ranged between 3.0 and 7.9. Leaf concentration factors (log LCF L/kg wet weight) ranged between 2.4 and 8.2. syn- and anti-DPs exhibited the greatest RCF and LCF values. A strong linear relationship was observed between log RCF and octanol-water partition coefficient (log K ). Translocation factors (log TFs) were negatively correlated with log K . The results demonstrate that more hydrophobic compounds exhibit higher degrees of partitioning into plant roots and are less effectively transported from roots to plant leaves. Methyl triclosan (MTCS) and 2,8-dichlorodibenzo-p-dioxin (DCDD), TCS degradation products, exhibited relatively high concentrations in roots and leaves., highlighting the importance of degradation/biotransformation. The results further suggest that Typha angustifolia in this constructed wetland can aid the removal of hydrophobic organic contaminants present in this landfill leachate. The findings will aid future investigations regarding the fate and bioaccumulation of hydrophobic organic contaminants in constructed wetlands.
[Mh] MeSH terms primary: Environmental Monitoring/methods
Organic Chemicals/analysis
Typhaceae/metabolism
Water Pollutants, Chemical/analysis
Wetlands
[Mh] MeSH terms secundary: Dioxins/analysis
Dioxins/metabolism
Flame Retardants/analysis
Flame Retardants/metabolism
Hydrocarbons, Chlorinated/analysis
Hydrocarbons, Chlorinated/metabolism
Hydrophobic and Hydrophilic Interactions
Organic Chemicals/metabolism
Pesticides/analysis
Pesticides/metabolism
Polychlorinated Biphenyls/analysis
Polychlorinated Biphenyls/metabolism
Polycyclic Compounds/analysis
Polycyclic Compounds/metabolism
Singapore
Triclosan/analogs & derivatives
Triclosan/analysis
Triclosan/metabolism
Typhaceae/growth & development
Water Pollutants, Chemical/metabolism
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Dioxins); 0 (Flame Retardants); 0 (Hydrocarbons, Chlorinated); 0 (Organic Chemicals); 0 (Pesticides); 0 (Polycyclic Compounds); 0 (Water Pollutants, Chemical); 0 (dechlorane plus); 4NM5039Y5X (Triclosan); 5174UR1DP5 (methyl triclosan); DFC2HB4I0K (Polychlorinated Biphenyls); JPA391PZI1 (2,8-dichlorodibenzo-4-dioxin)
[Em] Entry month:1710
[Cu] Class update date: 171116
[Lr] Last revision date:171116
[Js] Journal subset:IM
[Da] Date of entry for processing:170528
[St] Status:MEDLINE

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[PMID]: 28525817
[Au] Autor:Bonanno G; Cirelli GL
[Ad] Address:Department of Biological, Geological and Environmental Sciences, University of Catania, Via Longo 19, 95125 Catania, Italy. Electronic address: bonanno.giuseppe@unict.it.
[Ti] Title:Comparative analysis of element concentrations and translocation in three wetland congener plants: Typha domingensis, Typha latifolia and Typha angustifolia.
[So] Source:Ecotoxicol Environ Saf;143:92-101, 2017 Sep.
[Is] ISSN:1090-2414
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:This study analyzed the concentrations and distributions of Al, As, Cd, Cr, Cu, Hg, Mn, Ni, Pb and Zn in three different cattail species growing spontaneously in a natural wetland subject to municipal wastewater and metal contamination. The cattail species included Typha domingensis, T. latifolia and T. angustifolia. Results showed that all Typha species have similar element concentrations in roots, rhizomes and leaves, and similar element mobility from sediments to roots and from roots to leaves. This study corroborated three patterns of Typha species growing in metal contaminated environments: high tolerance to toxic conditions, bulk element concentrations in roots, and restricted element translocation from roots to leaves. This study showed that three different Typha species respond similarly to metal inputs under the same polluting field conditions. Given their similar metal content and similar biomass size, our results suggest that T. domingensis, T. latifolia and T. angustifolia may have comparable capacity of phytoremediation. High element uptake and large biomass make Typha species some of the best species for phytoremediation of metal contaminated environments.
[Mh] MeSH terms primary: Arsenic/analysis
Metals, Heavy/analysis
Typhaceae
Water Pollutants, Chemical/analysis
[Mh] MeSH terms secundary: Biodegradation, Environmental
Biomass
Plant Leaves/chemistry
Plant Roots/chemistry
Wetlands
[Pt] Publication type:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Name of substance:0 (Metals, Heavy); 0 (Water Pollutants, Chemical); N712M78A8G (Arsenic)
[Em] Entry month:1710
[Cu] Class update date: 171003
[Lr] Last revision date:171003
[Js] Journal subset:IM
[Da] Date of entry for processing:170520
[St] Status:MEDLINE

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[PMID]: 28477834
[Au] Autor:Huang X; Xiong W; Liu W; Guo X
[Ad] Address:College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China; Beijing Municipal Key Laboratory of Resources Environment and GIS, Beijing 100048, China. Electronic address: huangxingru@126.com.
[Ti] Title:Effect of reclaimed water effluent on bacterial community structure in the Typha angustifolia L. rhizosphere soil of urbanized riverside wetland, China.
[So] Source:J Environ Sci (China);55:58-68, 2017 May.
[Is] ISSN:1001-0742
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:In order to evaluate the impact of reclaimed water on the ecology of bacterial communities in the Typha angustifolia L. rhizosphere soil, bacterial community structure was investigated using a combination of terminal restriction fragment length polymorphism and 16S rRNA gene clone library. The results revealed significant spatial variation of bacterial communities along the river from upstream and downstream. For example, a higher relative abundance of γ-Proteobacteria, Firmicutes, Chloroflexi and a lower proportion of ß-Proteobacteria and ε-Proteobacteria was detected at the downstream site compared to the upstream site. Additionally, with an increase of the reclaimed water interference intensity, the rhizosphere bacterial community showed a decrease in taxon richness, evenness and diversity. The relative abundance of bacteria closely related to the resistant of heavy-metal was markedly increased, while the bacteria related for carbon/nitrogen/phosphorus/sulfur cycling wasn't strikingly changed. Besides that, the pathogenic bacteria markedly increased in the downstream rhizosphere soil since reclaimed water supplement, while the possible plant growth-promoting rhizobacteria obviously reduced in the downstream sediment. Together these data suggest cause and effect between reclaimed water input into the wetland, shift in bacterial communities through habitat change, and alteration of capacity for biogeochemical cycling of contaminants.
[Mh] MeSH terms primary: Bacteria/classification
Rhizosphere
Soil Microbiology
Typhaceae/microbiology
Wetlands
[Mh] MeSH terms secundary: Bacteria/genetics
Biodiversity
China
Environmental Monitoring
Soil
Urbanization
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Soil)
[Em] Entry month:1706
[Cu] Class update date: 171116
[Lr] Last revision date:171116
[Js] Journal subset:IM
[Da] Date of entry for processing:170508
[St] Status:MEDLINE

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[PMID]: 28391949
[Au] Autor:Ben Salem Z; Laffray X; Al-Ashoor A; Ayadi H; Aleya L
[Ad] Address:Bourgogne Franche-Comté University, Chrono-Environnement Laboratory, UMR CNRS 6249, F-25030 Besançon Cedex, France.
[Ti] Title:Metals and metalloid bioconcentrations in the tissues of Typha latifolia grown in the four interconnected ponds of a domestic landfill site.
[So] Source:J Environ Sci (China);54:56-68, 2017 Apr.
[Is] ISSN:1001-0742
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:The uptake of metals in roots and their transfer to rhizomes and above-ground plant parts (stems, leaves) of cattails (Typha latifolia L.) were studied in leachates from a domestic landfill site (Etueffont, France) and treated in a natural lagooning system. Plant parts and corresponding water and sediment samples were taken at the inflow and outflow points of the four ponds at the beginning and at the end of the growing season. Concentrations of As, Cd, Cr, Cu, Fe, Mn, Ni and Zn in the different compartments were estimated and their removal efficiency assessed, reaching more than 90% for Fe, Mn and Ni in spring and fall as well in the water compartment. The above- and below-ground cattail biomass varied from 0.21 to 0.85, and 0.34 to 1.24kgdryweight/m , respectively, the highest values being recorded in the fourth pond in spring 2011. The root system was the first site of accumulation before the rhizome, stem and leaves. The highest metal concentration was observed in roots from cattails growing at the inflow of the system's first pond. The trend in the average trace element concentrations in the cattail plant organs can generally be expressed as: Fe>Mn>As > Zn>Cr>Cu>Ni>Cd for both spring and fall. While T. latifolia removes trace elements efficiently from landfill leachates, attention should also be paid to the negative effects of these elements on plant growth.
[Mh] MeSH terms primary: Metalloids/analysis
Metals, Heavy/analysis
Typhaceae/chemistry
Waste Disposal Facilities
Water Pollutants, Chemical/analysis
[Mh] MeSH terms secundary: Biodegradation, Environmental
France
Ponds/chemistry
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Metalloids); 0 (Metals, Heavy); 0 (Water Pollutants, Chemical)
[Em] Entry month:1704
[Cu] Class update date: 170421
[Lr] Last revision date:170421
[Js] Journal subset:IM
[Da] Date of entry for processing:170411
[St] Status:MEDLINE

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[PMID]: 28316049
[Au] Autor:Zhang C; Wang B; Dai X; Li S; Lu G; Zhou Y
[Ad] Address:Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi, 653100, People's Republic of China.
[Ti] Title:Structure and function of the bacterial communities during rhizoremediation of hexachlorobenzene in constructed wetlands.
[So] Source:Environ Sci Pollut Res Int;24(12):11483-11492, 2017 Apr.
[Is] ISSN:1614-7499
[Cp] Country of publication:Germany
[La] Language:eng
[Ab] Abstract:Vertical flow constructed wetlands (VF CWs) are considered to be effective for treating organic pollutants. The rhizosphere of macrophytes such as Phragmites sp., Typha sp. serves as an active and dynamic zone for the microbial degradation of organic pollutants. However, it is still not clear how soil bacterial communities respond to macrophytes and pollutants during the process. For this purpose, the seedlings of Phragmites australis and Typha angustifolia were planted respectively in the VF CWs added with HCB at a dose of 2 mg/kg. During 96 days of cultivation, we monitored hexachlorobenzene (HCB) removal efficiency by GC/MS and the structure of the rhizosphere bacterial communities in the different VF CWs by denaturing gradient gel electrophoresis (DGGE), and constructed bacterial clone library based on PCR-amplified 16S rRNA gene. As expected, the rhizosphere bacterial communities also remained insensitive to HCB exposure in the wetland soil. The diversity of these microbes presented two stages, from the varied up and down to equilibrium in the entire experimental period. Molecular analysis revealed that the phylum Firmicutes dominated over the bacterial communities. The genera that increased under HCB stress included the well-known HCB-degrading bacteria (Pseudomonas sp. and Alcaligenes sp.) and other common bacteria found in contaminated soil but with lesser known practical functions (Burkholderia sp., Lysinibacillus fusiformis, and Bacillus cereus). Furthermore, there was a certain variance in the relative abundances of the bacterial phyla and HCB removal efficiency among different VF CW treatments. The degradation of HCB in T. angustifolia microcosms was faster than that in P. australis and unvegetated wetlands, and the highest bacterial diversity and richness was found in the VF CWs comprising T. angustifolia.
[Mh] MeSH terms primary: Bacteria/classification
Hexachlorobenzene/isolation & purification
Water Microbiology
Wetlands
[Mh] MeSH terms secundary: Biodegradation, Environmental
Poaceae/metabolism
RNA, Ribosomal, 16S/genetics
Rhizosphere
Typhaceae/metabolism
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (RNA, Ribosomal, 16S); 4Z87H0LKUY (Hexachlorobenzene)
[Em] Entry month:1706
[Cu] Class update date: 171103
[Lr] Last revision date:171103
[Js] Journal subset:IM
[Da] Date of entry for processing:170320
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-017-8463-1


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