Deep observations of two X-ray bright clusters of galaxies with ESA's XMM-Newton satellite allowed a group of international astronomers to measure their chemical composition with an unprecedented ...

Trace elements or metal elements are minerals found in trace levels in biological tissues. Some are confirmed to be nutritionally important, while the remaining are deemed non-essential. While trace ...

A METHOD of X-ray absorption analysis has been developed which permits the quantitative determination of elements with low atomic numbers in extremely small quantities of a biological tissue. It is ...