A free radical is an atom or group of atoms with a single unpaired electron. It is usually produced by breaking a covalent bond. The concept of the covalent (or electron-pair) bond was first formulated by the American chemist Gilbert Newton Lewis in...

A chemical molecule that has at least one unpaired electron. It has been suggested that they might contribute to the progression of many major degenerative processes in the human body and that these in turn can lead to serious conditions, including...

A free radical is an atom or MOLECULE which contains an unpaired ELECTRON, rendering it highly reactive. In order to achieve a stable state, a free radical will react with another molecule or atom, resulting in altered state or function of both...

Reactive intermediates such as an atom or fragment of a molecule with an impaired electron. OH radicals can initiate reactions which are responsible for oxidation of nitrogen oxide to nitrogen dioxide in the atmosphere. Free radicals are finding...

In chemistry, radicals (often referred to as free radicals) are atomic or molecular species with unpaired electrons on an otherwise open shell configuration. These unpaired electrons are usually highly reactive, so radicals are likely to take part in...

Derek Barton has stood (with a select few) at the pinnacle of organic chemistry for at least the past 25 years. From this exalted position he has not been slow to criticise the status quo or the work of lesser mortals. He wrote...

This article presents an overview of why scientists at Xerox became interested in developing a living-radical polymerization process and how they managed to be successful. Polymeric materials are ubiquitous in our daily lives. They can be found in the soles of the...

Following last month's Values Voter Summit in Washington, conservative Christian power-broker Gary Bauer sent an e-mail to supporters.He ticked off the issues dear to activists in attendance. Opposition to "abortion-on-demand" and preservation of traditional marriage led the way.Then the one-time presidential hopeful turned his attention...

The British Broadcasting Corp. announced Thursday it will cut 1,800 jobs, broadcast fewer programs and require staff to create content for television, radio and the Internet, creating a showdown with journalists and other employees.Union leaders said a strike was inevitable if the BBC went forward...