The silver price is based in troy ounces and that means we need to multiply the metal price by .0321507466 to make the conversion to grams. $7.1507 is the rounded silver value for the 1916-1947 silver Walking Liberty half dollar on August 17, 2016.
fixation noun (INTEREST) âº [ 1  C ] the state of being unable to stop thinking about something or someone, or an unnaturally strong interest in something or someone: âº [ 2  U ] specialized medical the process of attaching or sewing something firmly in place.
Therefore, nitrogen fixation is essential for agriculture and the manufacture of fertilizer. It is also an important process in the manufacture of explosives (e.g. gunpowder, dynamite, TNT, etc.). Nitrogen fixation occurs naturally in the air by means of lightning.Biological nitrogen fixation can include conversion to nitrogen dioxide. All biological nitrogen fixation is done by way of nitrogenase metalo-enzymes which contain iron, molybdenum, or vanadium.Microorganisms that can fix nitrogen are prokaryotes (both bacteria and archaea, distributed throughout their respective kingdoms) called diazotrophs.iological nitrogen fixation was discovered by the German agronomist Hermann Hellriegel and Dutch microbiologist Martinus Beijerinck. Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called a nitrogenase.