Contamination with 2,4,6-trinitrotoluene (TNT) is widespread at sites of past munitions manufacture. It is moderately toxic to plants and highly toxic to some animals. Some aquatic plant species have been observed to promote degradation of TNT. The degradative activity is associated with the root systems but products are found in the surrounding medium. We have examined a range of sixteen gener...

Salt-marsh plants play important roles in the hydrodynamics and sediment transport deposition processes coastal regions. The Delft3D model was applied to quantify influence of salt-marsh on hydrodynamic characteristics suspended a wetland, reveal contribution trapping local area. Specifically, spatial distributions were acquired from remote sensing images coupled with model. A comparison showed...

A number of molecular ecological studies have revealed complex and unique microbial communities in various terrestrial plant roots; however, little is known about the microbial communities of aquatic plant roots in spite of their potential use for water quality improvement in aquatic environments (e.g. floating treatment wetland system). Here, we report the microbial communities inhabiting the ...

one of the most important methods to investigate heavy metals as pollutants is more likely to use bio-monitors which can be applied as an appropriate index to express the quality of environment. in current study, in order to investigate the effects of dominant plants in the desired region and role of aquatic macrophytes in monitoring such elements as zinc (zn), lead (pb), copper (cu) and cadmiu...

abstract coontail (ceratophyllum demersum) and watermilfoil (myriophyllum spicatum) are current submersed weeds in many fresh waters of iran. the excessive growth of these plants causes the reduction in utilization of water resources and making some ecological and economical damages in these areas. the aim of this study was to determine the response of two submerged aquatic weeds of coontail an...

Uses Background Concentrations Environmental Chemistry General Chemical Properties Mode of Action Fate in Soils and Water Lethal and Sublethal Effects General Terrestrial Plants and Invertebrates Aquatic Organisms Birds Mammals Recommendations Acknowledgments References Tables Number 1 Paraquat concentrations in field collections of selected organisms and nonbiological materials 2 Chemical and ...

background recent guidelines have proposed that there is a correlation between tissue transglutaminase (ttg) antibody titers and degrees of duodenal biopsy, and that duodenal biopsy can be omitted in some patients with high levels of ttg antibody. using data of registered patients in a gastrointestinal clinic we aimed to assess the correlation between tissue transglutaminase antibody with duode...

Submerged aquatic vegetation or “SAV” includes both flowering and non-flowering plants that grow completely underwater. In the Chesapeake Bay region, the term “SAV” usually refers to various rooted aquatic angiosperms or “underwater grasses” found growing in shallow areas ranging from high salinity to freshwater tidal environments. Approximately 20 species are commonly found throughout Chesapea...

To better understand their fate and toxicity in aquatic environments, we compared the aggregation and dissolution behavior of gum arabic (GA) and polyvinylpyrrolidone (PVP) coated Ag nanoparticles (NPs) in aquatic microcosms. There were four microcosm types: surface water; water and sediment; water and aquatic plants; or water, sediment, and aquatic plants. Dissolution and aggregation behavior ...

We describe the general background and the recent advances in research on underwater photosynthesis of leaf segments, whole communities, and plant dominated aquatic ecosystems and present contemporary methods tailor made to quantify photosynthesis and carbon fixation under water. The majority of studies of aquatic photosynthesis have been carried out with detached leaves or thalli and this sele...