Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a class of cell membrane proteins that function as intermediaries between hormone receptors and effector enzymes and enable the cell to regulate its metabolism in response to hormonal changes.

Etymologies

From GTP-binding regulatory protein.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • Vale representatives said last week at the Brazilian Mining Institute's biannual congress that the company had discovered "safe" radioactive elements at the Salobo site that could be classified as rare-earth minerals.

    Brazil's Vale Discovers Rare Earths in Amazon

  • The region is also a key producer of so-called rare-earth elements, which are increasingly in demand in high-tech manufacturing, and are almost exclusively mined in China, which accounts for about 97% of global output.

    China Makes Effort to Cool Unrest in Inner Mongolia

  • Today, that mine, chock-full of so-called rare-earth metals, is responsible for one of the fastest windfalls in private-equity history: Turning $200 million into a paper profit of about $2.3 billion in just 30 months, or roughly $2.6 million in profit each day.

    Molycorp Pays Off for Buyout Believers

  • In recent years, concern has focused on the supply of so-called rare-earth elements - which include lanthanum, cerium and neodymium - as China produces about 95 percent of them, Graedel said.

    U.S. urged to safeguard supply of 'energy-critical elements'

  • Over the past few years, a spotlight has focused on supply concerns with so-called rare-earth elements - which include lanthanum, cerium and neodymium - as China now produces about 95 percent of these, Graedel said.

    U.S. urged to swiftly secure supplies of 'energy-critical elements'

  • These chemicals, known as rare-earth elements, are vital for the high-tech, defense and green-energy industries.

    MarketWatch.com - Top Stories

  • Some resources are really scarce on earth (PGMs for example) or geographically very unevenly distributed (Japan and China currently compete over relatively abundant rare-earth metals, and lithium in Bolivia)

    Why the Moon? Here's Why. - NASA Watch

  • At the time, the decision was overshadowed by the global uproar over China's move to restrict the export of rare-earth metals for political reasons.

    Lower China Molybdenum Output Stirs North American Production

  • Its locking system uses a rare-earth magnet as a key.

    Cute Co-Workers

  • Hybrid cars and wind turbines need rare-earth minerals that come with their own hefty environmental price tag.

    The California Experiment

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