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Other proteins, called cerebrocuprein, erythrocuprein, and hepatocuprein, that are found in the mammalian brain, erythrocytes, and liver, respectively, contain about 60 percent of the total copper in those tissues; their functions are still unknown.There are a number of copper-containing enzymes; examples are (1) (an oxidase is an oxidizing enzyme), which contains eight atoms of copper per molecule; it is widely distributed in plants and microorganisms; (2) cytochrome oxidase, which contains heme and copper in a 1:1 ratio; (3) , which catalyze the formation of melanin (brownish-black pigments occurring in hair, skin, and retina of higher animals) and were the first enzymes in which copper was shown to be essential to function.Hahn and Meitner were searching for a ‘mother substance’ that decayed to actinium.Otto Hahn wrote that their goal was “to find that substance which…forms the starting point for the actinium series, and to determine whether and through which intermediates actinium is derived.” Their work was interrupted by the First World War.In 1917 they examined silica residue they had extracted from pitchblende (uranium oxide) over two years earlier.

Again this happened at different times in different locations in the world.Carbon’s small size allows it to form multiple bonds with many other small atoms, including carbon atoms, and is prevalent in a large number of chemical compounds.Carbon-based compounds are the basis for all living systems and comprise the structure of fossil fuels in the form of hydrocarbons. The International Union of Pure and Applied Chemistry designated the isotope C-12 as the basis for atomic weights, while the unstable isotope C-14, with a half-life of 5700 years, is used for carbon dating.They called the element ‘brevium’ because the isotope they had found (protactinium-234) has a very short half-life (1.17 minutes).Otto Hahn and Lise Meitner at the Kaiser Wilhelm Institute in Berlin, discovered a much longer lived isotope in 1917: protactinium-231 (half-life of 32 670 years).These molecules contain one atom of cobalt bound in a macrocyclic ring (i.e., one consisting of many atoms) called corrin, which is similar to a porphyrin ring.

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