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Heavy metal (chemistry) - Wikipedia, the free encyclopedia
A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the transition metals, some metalloids, lanthanoids, and actinides. Many d...
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Toxic metal - Wikipedia, the free encyclopedia
Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Often heavy metals are thought as synonymous, but...
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In this chapter, Baird discusses the descriptive environmental chemistry of four trace elements, mercury, lead., arsenic and cadmium. The approach is largely ... As such, I have little to add to Baird’s description. I append a few general comments regarding all trace elements in water and their properties.
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Lead, mercury, cadmium, arsenic, and, more recently, aluminum are the main toxic minerals. Beryllium, bismuth, and bromine must be considered as well. And there are other heavy and radioactive metals that could bring future difficulties.
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Metallothioneins are small, cysteine-rich proteins that avidly bind heavy metals such as zinc, copper, and cadmium to reduce their concentration to a physiological or nontoxic level. ... FIG.4. Transcriptional response to the toxic heavy metal cadmium depends on zinc-saturated metallothionein (Zn7-MT). (A) Transcription from...
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Metallothioneins are small, cysteine-rich proteins that avidly bind heavy metals such as zinc, copper, and cadmium to reduce their concentration to a physiological or nontoxic level. Metallothionein gene transcription is induced by several stimuli, notably heavy metal load and oxidative stress.
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There are a variety of mechanisms by which organisms reduce heavy metal toxicity, including production of heavy metal binding factors and proteins (metallothionein, GSH, and phytochelatin conjugates), exclusion of toxic heavy metals from cells by ion-selective metal transporters, and excretion or compartmentalization...
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