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...ory that most cancers were caused by environmental [[retrovirus]]es gained currency. It had long been known that most avian cancers were caused by retroviruses ...make a [[DNA]] copy of its [[RNA]]. Reverse transcription is necessary for production of the viral double-stranded [[DNA]], which is subsequently integrated into

...ge of German manufactured produce directly for these materials rather than currency, allowing Schacht to barter without reliance on the strength of the [[Reich Therefore the production of scarce resources becomes relatively expensive and a large cost to consum

...ily from the [[precious metal]] content. Most modern currencies are [[fiat currency]], allowing the coins to be made of base metal.{{Fact|date=July 2009}} [[Category:Currency production]]

...ing dependency on iron for military purposes helped to spur increased iron production and extraction processes. ...centuries which enriched the demand for precious metals in order to fill a currency shortage.<ref>Medieval Science and Technology: Original Essays.Medieval Iro