praseodymium
PubChem Notes:
Praseodymium Praseodymium. An element of the rare earth family of metals. It has the atomic symbol Pr, atomic number 59, and atomic weight 140.91.
Pr - definition from Biology-Online.org
[(Science: plant biology) The form of phytochrome that absorbs light in the red region (660 nm) and is thus converted to pfr. In the dark the equilibrium between pr and Pfr favours Pr, which is therefore more abundant.
MediLexicon praseodymium - Medical Dictionary Definition for Term 'praseodymium'
[1. An element of the lanthanide or “rare earth” group; atomic no. 59, atomic wt. 140.90765.
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