Amphibian population declines have been documented worldwide and environmental contaminants are believed to contribute to some declines. Maternal transfer of bioaccumulated contaminants to offspring may be an important and overlooked mechanism of impaired reproductive success that affects amphibian populations. Mercury (Hg) is of particular concern due to its ubiquity in the environment, known ...

[1] The toxicity of mercury’s methylated species and its biomagnification in aquatic food chains and global dispersion by the atmosphere are the cause of worldwide health problems. Recent reports have observed natural mass-dependent fractionation in mercury isotopes, and recent theoretical work has demonstrated that isotopic separation in mercury is due primarily to nuclear field shifts (nuclea...

The inhibition effect of arsenite, As(III), arsenate, As(V), inorganic mercury, Hg(II) and methylmercury, MeHg, on the respiration rate of activated sludge heterotrophic microorganisms was evaluated. As(III) and MeHg were much more toxic on activated sludge than As(V) and Hg(II) respectively. The effect of various experimental parameters, such as sludge age, concentration of suspended solids an...

2.1 Metal Toxicity ..................................................................................................................... 14 2.1.1 Selected Heavy Metals ............................................................................................ 14 2.1.1.1 Lead ......................................................................................................... 14 2.1.1.2 Cad...

Published chronic toxicity data for Hg(II) added to soils were assembled and evaluated to produce a data set comprising 52 chronic end-points, five each for plants and invertebrates and 42 for microbes. With end-points expressed in terms of added soil Hg(II) contents, Critical Limits were derived from the 5th percentiles of species sensitivity distributions, values of 0.13 microg(g soil)(-1) an...

We report a two-photon fluorescent probe (AHg1) that can be excited by 780 nm femto-second pulses, shows high photostability and negligible toxicity, and can visualize the site of Hg(2+) accumulation, but can also estimate trace amounts of mercury ions in fresh fish organs by two-photon microscopy.

Exposure to methanol can cause serious consequences such as permanent visual disturbances and death. The heart tissue is highly vulnerable ATP deficiency. Our study aimed investigate whether exogenous administration may alleviate methanol-induced deficiency subsequent oxidative damage in rat tissue. A total of 30 rats were divided into equal five groups; Healthy Group (HG), Methotrexate (MXG), ...

The hazardous element (HE) pollution of urban surface dust is a serious environmental issue, due to its toxicity and potential effects. Surface samples were collected from core urban, suburban gradients in the city Urumqi arid northwestern China, concentrations six HEs, such as arsenic (As), cadmium (Cd), nickel (Ni), lead (Pb), mercury (Hg), chromium (Cr) determined. load index (PLI) US EPA he...

Human diploid cells (WI-38) were serially subcultivated at partial pressures of oxygen (Po2) ranging from 5.6 mm Hg to 608 mm Hg. At a Po2 of 5.6 mm Hg, the number of doublings to phase out was less than that of control cells at a Po2 of 137 mm Hg. Cultures grown at Po2's of 24, 49, or 137 mm Hg grew at the same rate and phased out after a similar number of population doublings. Population life...