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- Krebs Cycle or Citric Acid Cycle
- citric acid cycle or Krebs cycle (krčbz), series of chemical reactions
occurring in the cells of higher plants, animals, and many microorganisms. It is essential
for the oxidative metabolism of GLUCOSE and other simple sugars. The reactions take a
molecule of citric acid (originating from glucose) through several intermediate products;
additional organic molecules are incorporated and citric acid is regenerated. Each cycle
releases hydrogen atoms, which are necessary for the next stage of the metabolic process
to generate chemical energy for the organism. 1
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- L-doˇpa
- L-doˇpa (čl-došpe) (noun) The levorotatory form of dopa, used to treat
Parkinson’s disease. Also called levodopa. [L(EVOROTATORY) + DOPA.] 2
- L-dopa or levadopa, drug used to alleviate symptoms of PARKINSON’S
DISEASE and related syndromes, particularly rigidity, slow movements, and trembling,
resulting from a deficiency of dopamine in the brain. Introduced into the bloodstream,
L-dopa is probably converted to dopamine by neurons in the brain. 1
- Lipoprotein or LDL
- lipoprotein, any organic compound that is composed of both protein and the
various fatty substances, e.g. fatty acids and steroids such as cholesterol, classed as
LIPIDS. There are several types of lipoproteins present in human blood, including
low-density (low protein to fat ratio) lipoproteins (LDL) and high-density (high protein
to fat ratio) lipoproteins (HDL). LDLs transport CHOLESTEROL to cells that need it and
deposit excess cholesterol in the cells lining the blood vessels, forming the plaque that
increases the risk of ARTERIOSCLEROSIS. HDLs transport cholesterol from the tissues to the
liver for excretion, retarding the formation of plaque and lowering the risk of
arteriosclerosis.
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