نتایج جستجو برای: metals

تعداد نتایج: 63791  

Journal: :Bulletin of environmental contamination and toxicology 1995
J Abalde A Cid S Reiriz E Torres C Herrero

Heavy metals are introduced into aquatic ecosystems from industrial wastes, agricultural runoff and mining activities. The toxicity of heavy metal ions in solution to microalgae is well known. The essentiality and toxicity of heavy metals has been a subject of extensive research (Stokes 1983). From a biological point of view, heavy metals can be divided into two categories: essential and non-es...

2013
John W. Moreau John H. Fournelle Jillian F. Banfield

Bioremediation strategies that depend on bacterial sulfate reduction for heavy metals remediation harness the reactivity of these metals with biogenic aqueous sulfide. Quantitative knowledge of the degree to which specific toxic metals are partitioned into various sulfide, oxide, or other phases is important for predicting the long-term mobility of these metals under environmental conditions. H...

Journal: :archives of hygiene sciences 0
abaidya nath singh environmental pollution impact assessment laboratory, department of botany, udai pratap autonomous college, varanasi. -221002. devendra mohan environmental science division, department of civil engineering i.i.t. (b.h.u.), varanasi-221005. anjali shukla indian institute of vegetable research, jakhini (shahanshapur), varanasi-221305. pankaj kumar environmental pollution impact assessment laboratory, department of botany, udai pratap autonomous college, varanasi. -221002.

background & aims of the study: vegetables and cereals are considered vital for properly-balanced diet given that they deliver vitamins, minerals, nutritional fiber, and phytochemicals. this study aimed to assess the concentration of as, cu, cd, pb, cr and hg in common vegetables and cereals in urban open markets in varanasi district, india materials & methods: total 260 edible portions of vege...

Journal: :EXS 2006
Troy R Durham Elizabeth T Snow

Metals are essential for the normal functioning of living organisms. Their uses in biological systems are varied, but are frequently associated with sites of critical protein function, such as zinc finger motifs and electron or oxygen carriers. These functions only require essential metals in minute amounts, hence they are termed trace metals. Other metals are, however, less beneficial, owing t...

Journal: :The Journal of biological chemistry 1989
L A Speizer M J Watson J R Kanter L L Brunton

Other laboratories have reported biphasic effects of heavy metals on protein kinase C activity: stimulation followed by inhibition at higher concentrations. We demonstrate that these earlier findings most likely resulted from a combination of the effect of the heavy metals to liberate Ca2+ from Ca2+-EGTA buffer systems and the direct inhibitory effects of the metals on protein kinase C. Simulat...

2014
Junzeng Xu Qi Wei Yanmei Yu Shizhang Peng Shihong Yang

To reveal the impact of irrigation management on the release and leaching of soil metals (Cu, Zn, Pb, Cr, and Cd), deep percolation rate and metals contents in soil solutions were observed in rice fields with nonflooding controlled irrigation (NFI) and flooding irrigation (FI) treatments. The contents of Cu and Cr in the deep solutions were safe according to the environmental quality standard f...

Journal: :Behavioural brain research 2010
J Thomas Curtis Amber N Hood Yue Chen George P Cobb David R Wallace

We examined the effects of chronic metals ingestion on social behavior in the normally highly social prairie vole to test the hypothesis that metals may interact with central dopamine systems to produce the social withdrawal characteristic of autism. Relative to water-treated controls, 10 weeks of chronic ingestion of either Hg(++) or Cd(++) via drinking water significantly reduced social conta...

2000

The metals segment differs from other sectors in its strong dependence upon exploration and acquisition of the best ore bodies and in its greater globalization of operations. Metals producers thus spoke the most about international technology trends and lessons to be gained from abroad. Despite present low metals prices, product demand remains high, and hence increasing productivity and lowerin...

2003
Elizabeth Alm

This paper focuses on the general ways in which microbes interact with metals. Some bacteria have evolved mechanisms to detoxify heavy metals, and some even use them for respiration. Microbial interactions with metals may have several implications for the environment. Microbes may play a large role in the biogeochemical cycling of toxic heavy metals also in cleaning up or remediating metal-cont...

Journal: :The Science of the total environment 1989
A Nicolaidou J A Nott

Seven heavy metals, Co, Cr, Cu, Fe, Mn, Ni and Zn, were measured in marine sediments, plants and invertebrates in the vicinity of a ferro-nickel smelting plant in Greece. The concentrations of metals in the sediment were higher than those found in the average unpolluted Greek coastal sediment. High levels of metals were observed in the gastropod molluscs, particularly Cerithium vulgatum, which ...

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