History of saffron
fresco from the excavation of Akrotiri on the Aegean island of Santorini .
The history of saffron in human cultivation and use reaches back more than 3,000 years. and spans many cultures, continents, and civilizations. Saffron , a spice derived from the dried stigmas of t more
Antioxidant glutathione . The yellow sphere is the redox-active sulfur atom that provides antioxidant activity, while the red, blue, white, and dark grey spheres represent oxygen, nitrogen, hydrogen, and carbon atoms, respectively.
An antioxidant is a molecule capable of slowing or preventing th more
Xenon
Xenon ( in the UK, in the US) is a chemical element that has the symbol Xe and atomic number 54. A colorless, heavy, odorless noble gas , xenon occurs in the earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reaction s such as the forma more
Enzyme kinetics from E. coli with its two substrates, dihydrofolate (right) and NADPH (left), bound in the active site. The protein is shown as a ribbon diagram , with alpha helices in red, beta sheets in yellow and loops in blue. Generated from 7DFR .
Enzyme kinetics is the study of the chemic more
Technetium
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| Electron affinity || -53 kJ/mol
Technetium () is the lightest chemical element with no stable isotope . It has atomic number 43 and is given the symbol Tc. The chemical properties of this silvery grey, crystalline transition metal are inte more