Addition of a methyl group (-CH3) to the DNA base, cytosine, creates a modified base called 5-methylcytosine, found in both prokaryotes and eukaryotes. This process is catalyzed by enzymes called methylases. In bacteria, methylation is part of a...

A chemical reaction in which the methyl radical (-CH3) is added to some substance. The most common mechanism by which methylation occurs in the environment is biological methylation, which involves the action of living organisms. Bacteria in...

The process by which a methyl radical (-CH3) is chemically combined with some other substance through the action of a living organism. One of the most environmentally important examples of this process is the methylation of mercury in the sediments of...

To methylate is to replace an ATOM (typically hydrogen) on a MOLECULE with a methyl group (a -CH3 group). DNA methylation involves attachment of a methyl group to the nucleotide CYTOSINE. This serves to protect DNA and can help regulate GENE...

Methylation is a term used in the chemical sciences to denote the attachment or substitution of a methyl group on various substrates. This term is commonly used in chemistry, biochemistry, and the biological sciences. In biochemistry, methylation more...

The Environmental Protection Agency on Friday delayed approval of a new toxic fumigant for use by fruit and vegetable farmers, after more than 50 prominent scientists objected that the chemical was too dangerous.The agency said previously that a decision would be announced by Friday about...

The Environmental Protection Agency is expected within days to approve a new toxic fumigant for use by fruit and vegetable farmers, despite opposition from California regulators, prominent scientists and environmental and farmworker groups.The agency intends to register methyl iodide as a substitute for the pesticide...

The Environmental Protection Agency gave the go-ahead for one-year use of a new agricultural pesticide Friday, saying its own scientific review overrides health concerns expressed by more than 50 chemists and other scientists.Methyl iodide, also known as iodomethane, will be allowed to control soil pests...

Arielle Newman was a high school track star who suffered from the typical aches and pains that result from a grueling training regimen. For relief, she covered her legs with large amounts of muscle cream.The 17-year-old died from an accidental overdose of methyl salicylate, the...