When used above the medical dose range, stimulants are associated with the development of stimulant psychosis. As with all addictive drugs, the overexpression of ÎFosB in D1-type medium spiny neurons in the nucleus accumbens is implicated in methylphenidate addiction.
Definitions (2) 1. The degree to which an investor or business is utilizing borrowed money. Companies that are highly leveraged may be at risk of bankruptcy if they are unable to make payments on their debt; they may also be unable to find new lenders in the future.
quarry verb [I or T]. âº PRODUCTION, NATURAL RESOURCES to dig stone, etc. from a quarry: The âmining and quarrying âsector as a whole is expected to âgrow by 6.8% this âyear.(Definition of quarry from the Cambridge Business English Dictionary Â© Cambridge University Press).uarry noun [C]. âº PRODUCTION, NATURAL RESOURCES a âplace where stone, sand, etc. is dug out of the âground for use as âbuilding âmaterial: a granite/limestone/marble quarry His father âworked in a limestone quarry. a rock/stone/slate quarry.