The potential exists to inadvertently increase the risk of mercury (Hg) accumulating in South Bay fish and wildlife through hydrological modification of salt ponds as part of the South Bay Salt Pond Restoration Project (SBSPRP). The concern is that management actions will favor conversion of Hg into toxic methylmercury (MeHg) and its uptake into local food webs. Concerns about possible mercury ...

Freshwater ecosystems are highly susceptible to mercury (Hg) deposition, which impacts biotic health and leads to serious consequences through biomagnification. The keystone zooplankter, Daphnia, exerts disproportionate effects on food web dynamics, displaying high sensitivity to natural stressors, and thus serving as an indicator of the broader impairments of aquatic ecosystems. Combined with ...

Environmental risk assessment and water quality management are becoming increasingly important issues, particularly in view of the large number contaminants entering aquatic environment that harmful to functioning an ecosystem. Interest metals like Zn, Cu, Fe Mn, which required for metabolic activities organisms, lies narrow "window" between their essentiality toxicity. Other heavy Cd, Hg, Cr P...

Leaves of Portulaca oleracea have the potential of regeneration, when grown in a distilled water medium. The two heavy metals, Se and Hg individually and in combination affected both shoot and root development. They completely arrested shoot development at all concentrations. However, they produced concentration-dependent changes in the development of roots, which ranged from their complete inh...

Nitrate reductase (NR) is the key enzyme of nitrate assimilation subjected to inhibition by heavy metal treatment .In general, the inhibitory effect of heavy metals may be attributed to either blocking the supply of reducing equivalents of nitrate reduction, formation of mercurial derivatives of thiol(–SH) groups of nitrate reductase or synthesis of phytochelatins (PC).The effect of mercury(Hg)...

The concentrations of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) in 17 surface sediment samples from the Hailar River, upper source Ergun which is boundary river between China Russia, were analyzed. Traceability cause analysis carried out by correlation principal component analysis. results showed that Hg Cd sediments exceeded soil background values. Due to high biological toxicity factor...

Hadejia-Nguru wetland has been known to be a productive area of Agricultural engagements and fisheries activities allowing for intensive farming fishing activities, effluents from agricultural sewage, chemical seepages enter this water body. This study investigated the levels several heavy metals Mercury (Hg), Lead (Pb), Cadmium (Cd),Chromium (Cr), Aluminum (Al) in O. niloticus tissues (gills, ...

BODIPY-clickates, F1 and F2, for the detection of Hg(2+) have been designed, synthesized and characterized. Both F1 and F2 showed hyperchromic shifts in the UV-visible spectra in response to increasing Hg(2+) concentrations. Hg(2+) ion binding caused perturbation of the emission quenching process and chelation induced enhanced bathochromic emission of F1 and F2 to 620 nm and 660 nm, respectivel...

We examined the tolerance development to mercury (Hg) by a population of freshwater zooplankton (Daphnia magna) with different pre-exposure histories to Hg. The growth and reproductive performance of the F1 offspring as affected by the maternal (F0) and offspring (F1) exposures was quantified. The F0 daphnids exposed to 2.5 and 25 nM of Hg for 4 d and followed by 4 d of depuration had elevated ...