re fix

Science Dictionary
fix  [%PREMIUM_LINK%]     (fĭks)  Pronunciation Key 
  1. To convert inorganic carbon or nitrogen into stable, organic compounds that can be assimilated into organisms. Photosynthetic organisms such as green plants fix carbon in carbohydrates as food; certain bacteria fix nitrogen as ammonia that can be absorbed directly or through nitrification by plant roots. See more at carbon fixation, nitrogen fixation.

  2. To convert a substance, especially a gas, into solid or liquid form by chemical reactions.

  3. To kill and preserve a tissue specimen rapidly to retain as nearly as possible the characteristics it had in the living body.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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