Copper is a reddish-brown, ductile and malleable metal. It belongs to group IB of the Periodic Table. In compounds found in the environment it usually has a valence of 2 but can exist in the metallic, +1 and +3 valence ...

Polycyclic aromatic hydrocarbons (PAH) constitute a large class of compounds, and hundreds of individual substances may be released during incomplete combustion or pyrolysis of organic matter, an important source of human ...

Methyl tertiary-butyl ether (MTBE) is one of several ethers that may be used as fuel additives and is currently by far the dominant one. Ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary-amyl ...

The role of the immune system may be succinctly stated as the "preservation of integrity". This system is responsible for identifying what is "self" and what is "non-self". The great complexity of the mammalian system is ...

This monograph is an amalgamation of two draft documents "Principles for the Assessment of Risk from Exposure to Chemicals" and "General Principles and Methods for Chemical Safety (Human Health Protection)". Both documents ...

Bis(2-chloroethyl) ether (BCEE), bis(chloromethyl) ether (BCME) and chioromethyl methyl ether (CMME) are chemicals from a large class known as chloroalkyl ethers. The three ethers are colourless volatile liquids at room ...

Polybrominated dibenzo-p-dioxins (PBDDs) and polybrominated dibenzofurans (PBDFs) are almost planar tricyclic aromatic compounds. Theoretically, 75 PBDDs and 135 PBDFs are possible. In addition, a large number of mixed ...

Chrysotile is a fibrous hydrated magnesium silicate mineral that has been used in many commercial products. It is widely used in global commerce today. Its physical and chemical properties as a mineral are observed to vary ...