Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| lead and zinc accumulation and tolerance in populations of six wetland plants. | wetland plants such as typha latifolia and phragmites australis have been indicated to show a lack of evolution of metal tolerance in metal-contaminated populations. the aim of the present study is to verify whether other common wetland plants such as alternanthera philoxeroides and beckmannia syzigachne, also possess the same characteristics. lead and zinc tolerances in populations of six species collected from contaminated and clean sites were examined by hydroponics. in general, the contamina ... | 2006 | 16214279 |
| foliar uptake of cesium from the water column by aquatic macrophytes. | the probable occurrence and rate of foliar absorption of stable cesium (133cs) from the water column by aquatic macrophyte species was analyzed following the addition of 133cs into a small reservoir near aiken, south carolina, usa. an uptake parameter u (10(3)lkg(-1)d(-1)) and a loss rate parameter k (d(-1)) were estimated for each species using time series of 133cs concentrations in the water and plant tissues. foliar uptake, as indicated by rapid increases in plant concentrations following the ... | 2006 | 15990203 |
| hyperspectral reflectance response of freshwater macrophytes to salinity in a brackish subtropical marsh. | coastal freshwater wetlands are threatened by increased salinity due to relative sea level rise and reduced freshwater inputs. remote radiometric measurement of freshwater marsh canopies to detect small shifts in water column salinity would be useful for assessing salinity encroachment. we measured leaf hyperspectral (300-1100 nm) reflectance of freshwater macrophytes (cattail, typha latifolia and sea oxeye, borrichia frutescens) in a field study in a subtropical brackish (2.5-4.5 parts per thou ... | 2007 | 17412913 |
| ammonia removal from facultative pond effluents in a constructed wetland and an aerated rock filter: performance comparison in winter and summer. | the effluent from a facultative pond loaded at 80 kg bod ha(-1) day(-1) was treated in a subsurface horizontal-flow aerated rock filter (rf) and a subsurface horizontal-flow constructed wetland (cw) planted with typha latifolia. over a 12-month monitoring period bod and tss removals were higher, and effluent ammonia concentrations lower, in the rf than in the cw (> 75% vs. 25-75%, and 3.6 mg n l(-1) vs. 6 mg n l(-1), respectively). however, the ammonia concentration was lower in the cw effluent ... | 2007 | 17571848 |
| seasonal influence on sulfate reduction and zinc sequestration in subsurface treatment wetlands. | to characterize the effects of season, temperature, plant species, and chemical oxygen demand (cod) loading on sulfate reduction and metals removal in treatment wetlands we measured pore water redox potentials and concentrations of sulfate, sulfide, zinc and cod in subsurface wetland microcosms. two batch incubations of 20 day duration were conducted in each of four seasons defined by temperature and daylight duration. four treatments were compared: unplanted controls, typha latifolia (broadleaf ... | 2007 | 17599383 |
| on fitting the k-c* first order model to batch loaded sub-surface treatment wetlands. | the k-c* first order model was fit to time-series cod data collected from batch-loaded model wetlands. four replicates of four plant species treatments; carex utriculata (sedge), schoenoplectus acutus (bulrush), typha latifolia (cattail) and unplanted controls were compared. temperature was varied by 4 degrees c from 24 degrees c to 4 degrees c to 24 degrees c over a year-long period. one mathematical fit was made for each wetland replicate at each temperature setting (192 fits). temperature eff ... | 2007 | 17802843 |
| effects of type of flow, plants and addition of organic carbon in the removal of zinc and chromium in small-scale model wetlands. | constructed wetlands are used for the treatment of wastewater containing metals. in order to clarify the role of plants, flow and the impact of organic matter, an investigation of three factors, each at two different levels, was carried out in small-scale model wetlands. the evaluated factors and levels were: type of flow (subsurface and surface); presence of plants (planted with typha latifolia and unplanted) and addition of organic matter (with and without). eight different experimental units ... | 2007 | 17802856 |
| urea transformation of wetland microbial communities. | transformation of urea to ammonium is an important link in the nitrogen cycle in soil and water. although microbial nitrogen transformations, such as nitrification and denitrification, are well studied in freshwater sediment and epiphytic biofilm in shallow waters, information about urea transformation in these environments is scarce. in this study, urea transformation of sedimentary, planktonic, and epiphytic microbial communities was quantified and urea transformation of epiphytic biofilms ass ... | 2007 | 17268879 |
| five year water and nitrogen balance for a constructed surface flow wetland treating agricultural drainage waters. | the performance of a constructed surface flow wetland in reducing diffuse n pollution coming from croplands is being investigated in an ongoing experiment, begun in 1998 in ne italy. the 0.32 ha wetland is vegetated with phragmites australis (cav.) trin. and typha latifolia (l.). it receives drainage water from 6 ha of land managed for an experiment on drainage systems, where maize, sugarbeet, winter wheat and soybean are cultivated. during the period 1998-2002, the wetland received from 4698 to ... | 2007 | 17270250 |
| constructed wetland systems vegetated with different plants applied to the treatment of tannery wastewater. | wastewaters from leather processing are very complex and lead to water pollution if discharged untreated, especially due to its high organic loading. in this study the survival of different plant species in subsurface horizontal flow constructed wetlands receiving tannery wastewater was investigated. five pilot units were vegetated with canna indica, typha latifolia, phragmites australis, stenotaphrum secundatum and iris pseudacorus, and a sixth unit was left as an unvegetated control. the treat ... | 2007 | 17320926 |
| field comparison of bermuda-hay infusion to infusions of emergent aquatic vegetation for collecting female mosquitoes. | field experiments were conducted in east-central alabama in 2003 and 2004 to compare the attractiveness of selected gravid-trap infusions to ovipositing female mosquitoes. comparisons were made among infusions of the following plants: bermuda hay, cynodon dactylon, and 3 species of emergent aquatic plants typical of culex larval habitats, i.e., soft rush, juncus effusus; a common sedge, rhynchospora corniculata; and broad-leaf cattail, typha latifolia. experiments were conducted at a site in lee ... | 2007 | 17847842 |
| influence of vegetation and substrate on the removal and transformation of dissolved organic matter in horizontal subsurface-flow constructed wetlands. | the fate of dissolved organic matter (dom) during horizontal subsurface-flow constructed wetlands (hssf cws) was examined. in several studies it had been demonstrated that factors such as vegetation and substrates type affected the treatment efficiency of dom, while very few studies discerned their influence on the transformations of dom. thus three pilot-scale hssf cws, i.e. reed (phragmites australis)/gravel bed (w1), hybrid vegetation{cattail (typha latifolia), bulrush (scirpus validus), reed ... | 2008 | 17964141 |
| phytotoxicity of oil sands naphthenic acids and dissipation from systems planted with emergent aquatic macrophytes. | differences in dissipation and phytotoxicity were measured for two naphthenic acid mixtures in hydroponically grown emergent macrophytes (typha latifolia, phragmites australis, and scirpus acutus). one of the naphthenic acid (na) mixtures was extracted from tailings pond water of an oil sands operation in fort mcmurray, alberta, canada. the other mixture was a commercially available na mixture. while the oil sands na mixture was less phytotoxic to wetland plants compared to the commercially avai ... | 2008 | 18161556 |
| the effects of tannery wastewater on the development of different plant species and chromium accumulation in phragmites australis. | toxicity tests were performed to assess the effect of tannery wastewater with different treatment levels on two wetland plants, phragmites australis and typha latifolia, which are frequently used in constructed wetlands (cws) for water treatment, and thus deepen the knowledge on their capacity to withstand the application of industrial wastewater. trifolium pratense, a plant generally used as an indicator in toxicity tests, was included as a control. end points measured were germination percenta ... | 2008 | 18214580 |
| effects of contrasting diets and temperatures on reproduction and prey consumption by proprioseiopsis asetus (acari: phytoseiidae). | proprioseiopsis asetus (chant) (acari: phytoseiidae) is a relatively unknown predacious mite with potential as a biological control agent of frankliniella occidentalis (pergande) (thysanoptera: thripidae) and tetranychus urticae koch (acari: tetranychidae). in this study, the developmental rate and other biological parameters of p. asetus were investigated. development of p. asetus was temperature dependent from 10 to 40 degrees c. nonlinear models were fitted to development rate (1/time) data f ... | 2008 | 18247141 |
| microbe-induced changes in metal extractability from fly ash. | a low cost and eco-friendly technology to bioremediate toxic metals associated with fly ash dumps that contaminate ground and surface water in and around fly ash settling ponds, was investigated. the impact of augmentation of fly ash tolerant bacterial strains, isolated from typha latifolia growing naturally on fly ash dumps, was studied for metal extractability. it was observed that most of the bacterial strains either induced the bioavailability of fe, zn and ni or immobilized pb, cr, cu, cd i ... | 2008 | 18262591 |
| influence of plants on the reduction of hexavalent chromium in wetland sediments. | this work addresses the effect that plants (typha latifolia and carex lurida) have on the reduction of cr(vi) in wetland sediments. experiments were carried out using tubular microcosms, where chemical species were monitored along the longitudinal flow axis. cr(vi) removal was enhanced by the presence of plants. this is explained by a decrease in the redox potential promoted by organic root exudates released by plants. under these conditions sulfate reduction is enhanced, increasing the concentr ... | 2008 | 18299165 |
| evaluation of different substrates to support the growth of typha latifolia in constructed wetlands treating tannery wastewater over long-term operation. | the aim of this study was to investigate the performance of horizontal subsurface flow constructed wetlands planted with typha latifolia treating tannery wastewater under long-term operation. two expanded clay aggregates (filtralite mr3-8-fmr and filtralite nr3-8-fnr) and a fine gravel-fg were used as substrate for the constructed wetland units plus one unit with fmr was left as an unvegetated control. the systems were subject to three hydraulic loadings, 18, 8 and 6cmd(-1), and to periods of in ... | 2008 | 18334290 |
| separating the effects of partial submergence and soil oxygen demand on plant physiology. | in wetlands, a distinct zonation of plant species composition occurs along moisture gradients, due to differential flooding tolerance of the species involved. however, "flooding" comprises two important, distinct stressors (soil oxygen demand [sod] and partial submergence) that affect plant survival and growth. to investigate how these two flooding stressors affect plant performance, we executed a factorial experiment (water depth x sod) for six plant species of nutrient-rich and nutrient-poor c ... | 2008 | 18376561 |
| molecular signatures of two cattail species, typha domingensis and typha latifolia (typhaceae), in south florida. | 2008 | 18467132 | |
| [optimization of nitrogen and phosphorus removal in vertical subsurface flow constructed wetlands by using polypropylene pellet as part of substrate]. | constructed wetlands experiments were conducted by using shale and typha latifolia l. as vertical subsurface flow constructed wetland substrate and plant for eutrophic jin river water treatment, and part of shale with polypropylene pellet was replaced to investigate its effect on nitrogen and phosphorus removal. in this study, hydraulic loading rate was equal to 800 mm/d, theoretic residence time was equal to 12 h. during the entire running period, maximal monthly mean ammonia-nitrogen (nh(4+) - ... | 2008 | 18624194 |
| ammonia emissions from surface flow and subsurface flow constructed wetlands treating dairy wastewater. | agricultural wastewater treatment is important for maintaining water quality, and constructed wetlands (cw) can be an effective treatment option. however, some of the n that is removed during treatment can be volatilized to the atmosphere as ammonia (nh(3)). this removal pathway is not preferred because it negatively impacts air quality. the objective of this study was to assess nh(3) volatilization from surface flow (sf) and subsurface flow (ssf) cws. six cws (3 sf and 3 ssf; 6.6 m(2) each) wer ... | 2008 | 18948455 |
| artificial wetlands performance: nitrogen removal. | artificial wetlands (aw) are a promising option for wastewater treatment in small communities due to their high performance in nutrients removal and low operation and maintenance costs. nitrogen can favour the growth of algae in water bodies causing eutrophication when present at high concentrations. nitrogen can be removed through different mechanisms (e.g. nitrification-denitrification, adsorption and plant uptake). environmental conditions such as temperature and relative humidity can play an ... | 2008 | 18957747 |
| evaluation of metal mobility/immobility in fly ash induced by bacterial strains isolated from the rhizospheric zone of typha latifolia growing on fly ash dumps. | in this investigation, 11 bacterial strains were isolated from the rhizospheric zone of typha latifolia. all the strains were aerobic, showed positive result with indole production and were able to grow in macconkey agar. however, four strains were gram positive and others gram negative. these strains were inoculated separately in the fly ash with additional source of carbon to test their ability to increase the bioavailability or immobilization of toxic metals like cu, zn, pb, cd and mn. it was ... | 2008 | 17382536 |
| nitrous oxide emission from polyculture constructed wetlands: effect of plant species. | loss of nitrogen from the soil-plant system has raised environmental concern. this study assessed the fluxes of nitrous oxide (n2o) in the subsurface flow constructed wetlands (cws). to better understand the mechanism of n2o emission, spatial distribution of ammonia-oxidizing bacteria (aob) in four kinds of wetlands soil were compared. n2o emission data showed large temporal and spatial variation ranging from -5.5 to 32.7 mg n2o m(-2) d(-1). the highest n2o emission occurred in the cell planted ... | 2008 | 17655987 |
| bioaccumulation and translocation of metals in the natural vegetation growing on fly ash lagoons: a field study from santaldih thermal power plant, west bengal, india. | a field study was conducted in the fly ash lagoons of santandih thermal power plant located in west bengal (india) to find out total, edta and dtpa extractable metals in fly ash and their bioaccumulation in root and shoot portion of the naturally growing vegetation. fly ash sample has alkaline ph and low conductivity. the concentration of total cu, zn, pb and ni were found higher than weathered fly ash and natural soil, where as co, cd and cr were found traces. five dominant vegetation namely, t ... | 2008 | 17429748 |
| design and performance of a pilot-scale constructed wetland treatment system for natural gas storage produced water. | to test the hypothesis that water produced from natural gas storage wells could be treated effectively by constructed wetland treatment systems, a modular pilot-scale system was designed, built, and used for treating gas storage produced waters. four simulated waters representing the range of contaminant concentrations typical of actual produced waters were treated, and the system's performance was monitored. freshwater wetland cells planted with schoenoplectus californicus and typha latifolia w ... | 2008 | 17566728 |
| [phosphorus rhizosphere depletion effect of four aquatic plants]. | four aquatic plants (alternanthera philoxeroides, typha latifolia, sagittaria sagittifolia, phragmites communis ) were cultured on p-enriched soil in a pot experiment to assess the phosphorus rhizosphere depletion effect and analysis the ratio of root to shoot, root morphology, phosphorus uptake efficiency and phosphorus use efficiency. an obvious variation in p concentration of the soil in the rhizophere and non- rhizophere was observed. compared with the non-rhizosphere (available p: 167.53 mi ... | 2008 | 19068629 |
| sorption and photodegradation of chlorpyrifos on riparian and aquatic macrophytes. | surface water bodies may become contaminated via spray drift following pesticide application. in this investigation, the photodegradation and sorption of chlorpyrifos was studied in four riparian macrophytes representative of mediterranean flora (phragmites australis, iris pseudacorus, equisetum pratense and typha latifolia). the results of experiments with both the active ingredient and the formulation dursban 48 ec confirm the ability of these species to interact with chemicals such as chlorpy ... | 2009 | 19089709 |
| study of the comparative dynamics of the incorporation of tissue free-water tritium (tfwt) in bulrushes (typha latifolia) and carp (cyprinus carpio) in the almaraz nuclear power plant cooling reservoir. | the almaraz nuclear power plant (spain) uses the water of arrocampo reservoir for cooling, and consequently raises the radioactive levels of the aquatic ecosystem of this reservoir. from july 2002 to june 2005, monthly samples of surface water, bulrushes (typha latifolia) and carp (cyprinus carpio) were collected from this reservoir. they were analyzed to determine the temporal evolution of the levels of (3)h in surface water and of its transfer from the surface water to free-water in the tissue ... | 2009 | 19128862 |
| aquatic plant-derived changes in oil sands naphthenic acid signatures determined by low-, high- and ultrahigh-resolution mass spectrometry. | mass spectrometry is a common tool for studying the fate of complex organic compound mixtures in oil sands processed water (ospw), but a comparison of low-, high- ( approximately 10 000), and ultrahigh-resolution ( approximately 400 000) instrumentation for this purpose has not previously been made. high-resolution quadrupole time-of-flight mass spectrometry (qtof ms) and ultrahigh-resolution fourier transform ion cyclotron resonance mass spectrometry (ft-icr ms), with negative-ion electrospray ... | 2009 | 19142845 |
| comparison of horizontal and vertical constructed wetland systems for landfill leachate treatment. | the main purpose of this study was to treat organic pollution, ammonia and heavy metals present in landfill leachate by the use of constructed wetland systems and to quantify the effect of feeding mode. the effect of different bedding material (gravel and zeolite surface) was also investigated. a pilot-scale study was conducted on subsurface flow constructed wetland systems operated in vertical and horizontal mode. two vertical systems differed from each other with their bedding material. the sy ... | 2009 | 19157867 |
| performance comparison of constructed wetlands with gravel- and rice husk-based media for phenol and nitrogen removal. | this study aims to compare the performance of planted and unplanted constructed wetlands with gravel- and raw rice husk-based media for phenol and nitrogen removal. four laboratory-scale horizontal subsurface-flow constructed wetland units, two of which planted with cattail (typha latifolia) were operated outdoors. the units were operated at a nominal hydraulic retention time of 7 days and fed with domestic wastewater spiked with phenol concentration at 300 mg/l for 74 days and then at 500 mg/l ... | 2009 | 19272632 |
| treatment of industrial wastewater with two-stage constructed wetlands planted with typha latifolia and phragmites australis. | industrial wastewater treatment comprises several processes to fulfill the discharge permits or to enable the reuse of wastewater. for tannery wastewater, constructed wetlands (cws) may be an interesting treatment option. two-stage series of horizontal subsurface flow cws with phragmites australis (up series) and typha latifolia (ut series) provided high removal of organics from tannery wastewater, up to 88% of biochemical oxygen demand (bod(5)) (from an inlet of 420 to 1000 mg l(-1)) and 92% of ... | 2009 | 19289277 |
| changes in the bacterial community structure in two-stage constructed wetlands with different plants for industrial wastewater treatment. | this study focused on the diversity of bacterial communities from two series of two-stage constructed wetlands (cws) treating tannery wastewater, under different hydraulic conditions. series were separately planted with typha latifolia and phragmites australis in expanded clay aggregates and operated for 31 months. the effect of plant species, hydraulic loading and unit stage on bacterial communities was addressed through bacterial enumeration and denaturating gradient gel electrophoresis (dgge) ... | 2009 | 19303772 |
| arsenic speciation in cattail (typha latifolia) using chromatography and mass spectrometry. | typha latifolia, commonly known as cattail, is widely used as traditional food and medicinal ingredients by indigenous people. there have been concerns over the high levels of total arsenic in cattail plants, but the chemical species of arsenic in cattail have not been characterized. we describe here the determination of arsenic species in the various compartments of cattail. average concentrations of total arsenic from 9 to 19 cattail plants were 1120 microg/kg (range 68-2600 microg/kg) in the ... | 2009 | 19382145 |
| effects of exogenous spermidine on subcellular distribution and chemical forms of cadmium in typha latifolia l. under cadmium stress. | the effects of foliar spraying with spermidine (spd) on the subcellular distribution and chemical speciation of cd in typha latifolia l. in hydroponic system were investigated. increased cd concentration in the medium caused an increase of cd concentration in all tissues and all subcellular fractions, with the highest cd level occurring in roots, followed by rhizomes and leaves and the greatest accumulation was in cell walls, soluble fraction and organelle containing fractions ranked next, respe ... | 2009 | 19403961 |
| ability of four emergent macrophytes to remediate permethrin in mesocosm experiments. | increased focus is being placed on the ability of native vegetation to mitigate potential harmful effects of agricultural runoff, especially pyrethroid insecticides. replicate 379 l rubbermaid tubs (1.25 m [l] x 0.6 m [w] x 0.8 m [h]) were planted with individual species of cutgrass (leersia oryzoides), cattails (typha latifolia), bur-reed (sparganium americanum), and powdery alligator-flag (thalia dealbata), all common wetland macrophytes found in the mississippi delta, usa, agricultural region ... | 2009 | 19458989 |
| do heavy metals and metalloids influence the detoxification of organic xenobiotics in plants? | mixed pollution with trace elements and organic industrial compounds is characteristic for many spill areas and dumping sites. the danger for the environment and human health from such sites is large, and sustainable remediation strategies are urgently needed. phytoremediation seems to be a cheap and environmentally sound option for the removal of unwanted compounds, and the hyperaccumulation of trace elements and toxic metals is seemingly independent from the metabolism of organic xenobiotics. ... | 2009 | 19462193 |
| differences in phytotoxicity and dissipation between ionized and nonionized oil sands naphthenic acids in wetland plants. | naphthenic acids (nas) are composed of alkyl-substituted acyclic and cycloaliphatic carboxylic acids and, because they are acutely toxic to fish, are of toxicological concern. during the caustic hot-water extraction of oil from the bitumen in oil sands deposits, nas become concentrated in the resulting tailings pond water. the present study investigated if dissipation of nas occurs in the presence of hydroponically grown emergent macrophytes (typha latifolia, phragmites australis, and scirpus ac ... | 2009 | 19469588 |
| removal and accumulation of cadmium and lead by typha latifolia exposed to single and mixed metal solutions. | we investigated the effect of cd and pb on the growth of the aquatic macrophyte typha latifolia; the removal from the solution and the accumulation of these elements by the plant were also studied. thus, small plants of t. latifolia, collected from a noncontaminated site, were exposed for 10 days to cd and pb, in a single solution or in mixture solutions, at two concentrations of the metals (5 and 7.5 mg/l). our results showed that t. latifolia removed effectively cd and pb from solutions and wa ... | 2009 | 19536587 |
| removal of personal care compounds from sewage sludge in reed bed container (lysimeter) studies--effects of macrophytes. | sludge reed beds have been used for dewatering (draining and evapotranspiration) and mineralisation of sludge in europe since 1988. although reed beds are considered as a low cost and low contamination method in reducing volume, breaking down organic matter and increasing the density of sludge, it is not yet clear whether this enhanced biological treatment is suitable for degradation of organic micro-pollutants such as personal care products. within this project the effect of biological sludge t ... | 2009 | 19682727 |
| [in situ dynamics of phosphorus in the rhizosphere solution and organic acids exudation of two aquatic plants]. | a mini-rhizotron experiment with alternanthera philoxeroides and typha latifolia was conducted to measure the spatial and temporal dynamics of phosphorus in the rhizosphere solution. the organic acids in the in situ rhizosphere soil solution were analyzed. a decreasing phosphorus concentration gradient in soil solution toward the root was observed for both a. philoxeroides and t. latifolia. the phosphorus concentration in the rhizosphere soil solution of a. philoxeroides (2.53 mg x l(-1)) was lo ... | 2009 | 19799282 |
| performance evaluation of planted and unplanted subsurface-flow constructed wetlands for the post-treatment of uasb reactor effluents. | a system comprised by a uasb (upflow anaerobic sludge blanket) reactor followed by two horizontal subsurface-flow constructed wetlands in parallel was evaluated for the treatment of the wastewater generated in the city of belo horizonte, brazil (50 inhabitants each unit). one unit was planted (typha latifolia) and the other was unplanted. influent and effluent samples were collected for a period of seven months. the systems were able to produce final effluents with low concentrations of organic ... | 2009 | 19955625 |
| phosphorus utilization and microbial community in response to lead/iron addition to a waterlogged soil. | constructed wetlands have emerged as a viable option for helping to solve a wide range of water quality problems. however, heavy metals adsorbed by substrates would decrease the growth of plants, impair the functions of wetlands and eventually result in a failure of contaminant removal. typha latifolia l., tolerant to heavy metals, has been widely used for phytoremediation of pb/zn mine tailings under waterlogged conditions. this study examined effects of iron as ferrous sulfate (100 and 500 mg/ ... | 2009 | 19999997 |
| impacts of the physiochemical properties of chlorinated solvents on the sorption of trichloroethylene to the roots of typha latifolia. | sorption to plant roots is the first step for organic contaminants to enter plant tissues. mounting evidence is showing that sorption to plant roots is nonlinear and competitive. the objective of this study was to investigate the effects of physiochemical properties of homologous chlorinated ethenes and ethanes on the competitive sorption of trichloroethylene (tce) to the roots of typha latifolia (cattail). the results showed that chlorinated ethenes exerted significantly stronger competition on ... | 2009 | 19013701 |
| pcr analysis of the presence and location of mycobacterium avium in a constructed reed bed, with implications for avian tuberculosis control. | the potential of reed beds to act as biofilters of pathogenic and environmental mycobacteria was investigated through examination of the fate of mycobacteria in a constructed reed bed filtering effluent from a large captive wildfowl collection. particular emphasis was placed on the presence and location of mycobacterium avium--the causal agent of avian tuberculosis (atb)--in an effort to clarify the potential role of reed beds in the control of this disease. water, sediment, and stems and roots ... | 2009 | 19049499 |
| structure and function of denitrifying and nitrifying bacterial communities in relation to the plant species in a constructed wetland. | the community structure and potential activities of nitrifying and denitrifying bacteria were studied in the rhizosphere of typha latifolia and phragmites australis present in a free water system constructed wetland (cw). potential nitrate reduction and nitrification activities were shown to be significantly higher in the rhizosphere when compared with the nonvegetated sediment. higher rates were generally obtained for p. australis. the community structure of denitrifying bacteria in the rhizosp ... | 2009 | 19049502 |
| comparative analysis of the composition of bacterial communities from two constructed wetlands for municipal and swine wastewater treatment. | this work provides information about bacterial community structure in natural wastewater treatment systems treating different types of wastewater. the diversity and composition of bacterial communities associated with the rhizosphere of typha latifolia and salix atrocinerea were studied and compared among two different natural wastewater treatment systems, using the direct sequencing of the 16s ribosomal rna codifying genes. phylogenetic affiliations of the bacteria detected allowed us to define ... | 2010 | 20009257 |
| implications of the plastid genome sequence of typha (typhaceae, poales) for understanding genome evolution in poaceae. | plastid genomes of the grasses (poaceae) are unusual in their organization and rates of sequence evolution. there has been a recent surge in the availability of grass plastid genome sequences, but a comprehensive comparative analysis of genome evolution has not been performed that includes any related families in the poales. we report on the plastid genome of typha latifolia, the first non-grass poales sequenced to date, and we present comparisons of genome organization and sequence evolution wi ... | 2010 | 20091301 |
| comparison between polishing (maturation) ponds and subsurface flow constructed wetlands (planted and unplanted) for the post-treatment of the effluent from uasb reactors. | this paper presents the results of a comparison of the performance of two treatment systems operating in parallel, with the same influent wastewater. the investigated systems are (i) uasb + three polishing ponds in series + coarse filter (200 population equivalents) and (ii) uasb + subsurface flow constructed wetlands (50 population equivalents). two wetland units, operating in parallel, were analysed, being one planted (typha latifolia) and the other unplanted. the systems were located in belo ... | 2010 | 20220242 |
| [effect of iron plaque on root surfaces on phosphorus uptake of two wetland plants]. | in situ micro-suction cups were used to collect samples of soil solution with arundo donax linn and typha latifolia from defined segments at rhizosphere in field. the experiment was conducted to elucidate the contribution of iron plaque while wetland plants were used to remove phosphorus. the reddish iron plaque was observed and measured on the surfaces of roots of arundo donax linn and typha latifolia in the field, 20,170.8 mg/kg (fresh weight) for arundo donax linn and 7640.3 mg/kg (fresh weig ... | 2010 | 20358843 |
| predation, development, and oviposition by the predatory mite amblyseius swirkii (acari: phytoseiidae) on tomato russet mite (acari: eriophyidae). | predation, development, and oviposition experiments were conducted to evaluate amblyseius swirskii (athias-henriot) (acari: phytoseiidae) as a potential biological control agent for tomato russet mite, aculops lycopersici (massee) (acari: eriophyidae), which can be a serious pest of greenhouse tomatoes. results showed that a. swirskii attacked all developmental stages of a. lycopersici and had a type ii functional response at the prey densities tested. the attack rate and handling time estimates ... | 2010 | 20568599 |
| depollution potential of three macrophytes: exudated, wall-bound and intracellular peroxidase activities plus intracellular phenol concentrations. | the aim of this study was to investigate the potential role of three macrophyte species (iris pseudacorus, typha latifolia and phragmites australis) for detoxication of xenobiotics, and to study their variations with seasons or concentrations of sewage sludge from the food industry. for this purpose, some aspects of the green liver concept were explored through peroxidase measurements in three compartments in roots: intracellular, cell wall and extracellular. in addition, phenol concentrations w ... | 2010 | 20570142 |
| feasibility of using an organic substrate in a wetland system treating sewage sludge: impact of plant species. | a vertical-flow wetland system was tested for treatment of liquid sludge with high organic concentrations using an organic substrate (peat/crushed pine bark, 1/1) as growing medium. mesocosms (1 m(3)) were planted with either phragmites australis cav., typha latifolia l., or iris pseudacorus l. the aim of the work was to determine the feasibility of using an organic substrate in treatment wetlands, through the study of its temporal patterns and of its impact on the water output quality. results ... | 2010 | 19733478 |
| species-specific ssr alleles for studies of hybrid cattails (typha latifolia x t. angustifolia; typhaceae) in north america. | • premise: studies of hybridizing species are facilitated by the availability of species-specific molecular markers for identifying early- and later-generation hybrids. cattails are a dominant feature of wetland communities, and a better understanding of the prevalence of hybrids is needed to assess the ecological and evolutionary effects of hybridization. hybridization between typha angustifolia and t. latifolia produce long-lived clones, known as typha ×glauca, which are considered to be invas ... | 2010 | 21616852 |
| vegetation changes and partitioning of selenium in 4-year-old constructed wetlands treating agricultural drainage. | the knowledge of selenium (se) partitioning in treatment wetlands and wetland vegetation management are essential for long-term effective operation of constructed wetlands treating se-laden agricultural tile-drainage in central california. in this field study, samples from different compartments of treatment wetlands were collected and the vegetation change in each wetland cell was examined four years after the wetland's inception. the results showed that saltgrass (distichlis spicata) and rabbi ... | 2010 | 20734620 |
| plants for waste water treatment--effects of heavy metals on the detoxification system of typha latifolia. | upon treatment with cd and as cattail (typha latifolia) showed induced catalase, monodehydroascorbate reductase and ascorbate peroxidase activities in leaves but strong inhibition in rhizomes. peroxidase activity in leaves of the same plants was inhibited whereas linear increase was detected after cd treatment in rhizomes. glutathione s-transferase measurements resulted in identical effects of the trace elements on the substrates cdnb, dcnb, nbc, nboc, fluorodifen. when gst was assayed with the ... | 2010 | 20951580 |
| wetland treatment (hssp) of wastewater from a milk-processing unit using bambusa vulgaris, typha latifolia and cyperus rotundus. | studies were conducted in soil-less horizontal sub-surface flow wetland (hssf) embedded with graded gravels using golden bamboo, bambusa vulgaris (a non-wetland species), typha latifolia and cyperus rotundus (wetland species) for the treatment of wastewater from a milk processing unit. the wastewater was treated with a dilution ratio of 3:1. removal efficiencies of bod and cod were studied at one, two and three days hydraulic retention time (hrt). at one day hrt, the removal efficiency (%) of th ... | 2010 | 21114102 |
| growth response and tissue accumulation trends of herbaceous wetland plant species exposed to elevated aqueous mercury levels. | the impacts of elevated aqueous mercury levels (0, 2, and 4 ppm) on the growth status and mercury tissue concentrations of eleocharis parvula, saururus cernuus, juncus effuses, typha latifolia, and panicum hemitomon were determined. both short-term (net co2 assimilation) and long-term (biomass) indicators of plant growth status suggest that eleocharis parvula, saururus cernuus, and juncus effuses were relatively unimpacted by elevated mercury levels, whereas typha latifolia and panicum hemitomon ... | 2010 | 21166283 |
| shifts in root-associated microbial communities of typha latifolia growing in naphthenic acids and relationship to plant health. | naphthenic acids (nas) are a complex mixture of organic acid compounds released during the extraction of crude oil from oil sands operations. the accumulation of toxic nas in tailings pond water (tpw) is of significant environmental concern, and phytoremediation using constructed wetlands is one remediation option being assessed. since root-associated microorganisms are an important factor during phytoremediation of organic compounds, this study investigated the impact of nas on the microbial co ... | 2010 | 21166345 |
| influence of plants on microbial activity in a vertical-downflow wetland system treating waste activated sludge with high organic matter concentrations. | the rhizosphere is a key zone for pollutant removal in treatment wetlands; therefore, studies on microbial activity may provide helpful information for a better understanding of purification processes. we studied microbial activity in a vertical-downflow constructed wetland system treating waste activated sludge with high organic matter concentrations, under mediterranean climate. the aims of the work were to study the influence of (i) the presence of plants, (ii) the plant species (phragmites a ... | 2011 | 21514037 |
| chemical residence time and hydrological conditions influence treatment of fipronil in vegetated aquatic mesocosms. | fipronil, a phenyl-pyrazole insecticide, is often used in rice (oryza sativa l.) production agriculture, with elevated runoff concentrations and loads having potential toxicological effects on downstream aquatic environments. this study evaluated two species of aquatic plants-broadleaf cattail (typha latifolia l.) and powdery alligator-flag (thalia dealbata fraser ex roscoe)-placed in series against a nonvegetated mesocosm in reducing concentrations and loads of fipronil, and associated metaboli ... | 2011 | 21520763 |
| correlation between pollen aperture pattern and callose deposition in late tetrad stage in three species producing atypical pollen grains. | • premise of the study: pollen grains of flowering plants display a fascinating diversity of forms, in spite of their minute size. the observed diversity is determined by the developmental mechanisms implicated in the establishment of pollen morphological features. pollen grains are generally surrounded by an extremely resistant wall interrupted in places by apertures that play a key role in reproduction, being the places at which pollen tube growth is initiated. aperture shape, number, and posi ... | 2011 | 21613108 |
| the application of δ(18) o and δd for understanding water pools and fluxes in a typha marsh. | the δ(18) o and δd composition of water pools (leaf, root, standing water, and soil water) and fluxes (transpiration, evaporation) were used to understand ecohydrological processes in a managed typha latifolia l. freshwater marsh. we observed isotopic steady state transpiration and deep rooting in typha. the isotopic mass balance of marsh standing water showed that evaporation accounted for 3% of the total water loss, transpiration accounted for 17%, and subsurface drainage accounted for the maj ... | 2011 | 21635269 |
| typha latifolia l. fruit polysaccharides induce the differentiation and stimulate the proliferation of human keratinocytes in vitro. | in northern america typha latifolia l. (typhaceae) fruits are used for more than 4000 years for treatment of skin disorders, burns and as wound dressing to absorb the ichors. | 2011 | 21669276 |
| Lead, chromium and manganese removal by in vitro root cultures of two aquatic macrophytes species: Typha latifolia L. and Scirpus americanus pers. | The ability of in vitro roots cultures of Typha latifolia and Scirpus americanus to remove metals was studied. Roots were cultivated on Murashige-Skoog medium with 15 microg L(-1) Cr 11, 60 microg L(-1) Pb II or 1.8 mg L(-1) Mn II. Adsorbed metal to root surface was removed by washing with 0.042% HNO3. T. latifolia roots were able to uptake 68.8 microg Pb g(-1), 22.1 microg Cr g(-1) and 1680 microg Mn g(-1), while the S. americanus roots removed 148.3 microg Pb g(-1), 40.7 microg Cr g(-1) and 40 ... | 2011 | 21972501 |
| Effect of polyaluminium chloride on phosphorus removal in constructed wetlands treated with swine wastewater. | Total phosphorus (TP) removal in aged constructed wetlands poses a challenge, especially when treated with swine wastewater with high concentrations of phosphorus (P). Our earlier studies with anaerobic lagoon swine wastewater treatment in constructed wetlands showed a decline in P removal (45-22%) with increased years of operation. These particular wetlands have been treated with swine wastewater every year since the first application in 1997. Preliminary lab-scale studies were conducted to eva ... | 2011 | 22049722 |
| cd, cu and zn mobility in contaminated sediments from an infiltration basin colonized by wild plants: the case of phalaris arundinacea and typha latifolia. | infiltration basins are shallow reservoirs in which stormwater is temporarily collected in order to reduce water volume in downstream networks. the settling of stormwater particles leads to a contaminated sediment layer. wild plants can colonize these basins and can also play a role on the fate of heavy metals either directly by their uptake or indirectly by modification of physico-chemical characteristics of the sediment and therefore by modification of the mobility of heavy metals. the aim of ... | 2011 | 22053483 |
| liquefaction of typha latifolia by supercritical fluid extraction. | milled typha latifolia stalk mill was converted to liquid products by using organic solvents (methanol, ethanol, acetone and 2-butanol) with catalysts (10% naoh or na(2)co(3)) and without catalyst in an autoclave at temperatures of 518, 538 and 558 k. the products were extracted by liquid-liquid extraction (benzene and diethyl ether). the percentage yields from supercritical methanol, ethanol, 2-butanol and acetone conversions were 55.0, 58.5, 62.7 and 70.5 at 538 k, respectively. in the catalyt ... | 2011 | 22221987 |
| tracer studies and hydraulic behaviour of planted and un-planted vertical-flow constructed wetlands. | the aim of this research was to assess the hydraulic behaviour of three intermittently-fed vertical flow wetland units operated in parallel, designed for the treatment of raw wastewater generated in the city of belo horizonte, brazil. the system was designed to serve 100 pe (-1 m2/pe). the first filter was planted with cattail (typha latifolia), the second with tifton-85 (cynodon spp.) and the third was maintained without plants (control unit). nacl tracer tests were conducted to determine the r ... | 2011 | 22214051 |
| life tables and development of amblyseius swirskii (acari: phytoseiidae) at different temperatures. | development time, reproduction, survival and sex ratio were determined for the omnivorous mite amblyseius swirskii at nine constant temperatures (13, 15, 18, 20, 25, 30, 32, 34 and 36°c) on pepper leaf disks with cattail, typha latifolia, pollen for food. these data were used to derive life table parameters at these constant temperatures. no development was observed at 13°c. the lower development threshold, based on the fit to the linear portion of the development curve, was 11.3°c. the upper de ... | 2011 | 20628894 |
| stimulated phytoextraction of metals from fly ash by microbial interventions. | various combinations of fly ash tolerant bacteria isolated from the rhizospheric zone of typha latifolia naturally growing on a fly ash dump site were tested for enhanced metal uptake by brassica juncea grown in fly ash amended with press mud. after enrichment of the bacteria in a nutrient broth, they were subsequently applied to the rhizospheric zone of b. juncea in different combinations. when the metal analysis was done in the plants at their maturity, it was revealed that out of 11 bacterial ... | 2012 | 23393983 |
| Purification processes involved in sludge treatment by a vertical flow wetland system: Focus on the role of the substrate and plants on N and P removal. | Vertical-flow wetland systems were tested for treatment of liquid waste activated sludge with high content of organic compounds from a soft drink factory. A mesocosm experiment was carried out on planted and unplanted systems to understand the relative importance of substrate and plants in purification processes and to compare three species: Phragmites australis Cav., Typha latifolia L., or Iris pseudacorus L. All planted mesocosms performed better than unplanted mesocosms and Phragmites showed ... | 2012 | 22178496 |
| use of liquid chromatography/electrospray ionization tandem mass spectrometry to study the degradation pathways of terbuthylazine (ter) by typha latifolia in constructed wetlands: identification of a new ter metabolite. | s-triazines are used worldwide as herbicides for agricultural and non-agricultural purposes. although terbuthylazine (ter) is the second most frequently used s-triazine, there is limited information on its metabolism. for this reason, an analytical method based on liquid chromatography/electrospray ionization tandem mass spectrometry (lc-esi ms/ms) has been developed aiming at the identification of ter and its five major metabolites (desisopropyl-hydroxy-atrazine, desethyl-hydroxy-terbuthylazine ... | 2012 | 22173806 |