• WordNet 3.6
    • n pyrimidine a heterocyclic organic compound with a penetrating odor
    • n pyrimidine any of several basic compounds derived from pyrimidine
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Century Dictionary and Cyclopedia
    • n pyrimidine An organic compound, composed of carbon, hydrogen, and nitrogen, so arranged that the carbon and nitrogen atoms form a ring or chain, as shown in the formula . Pyrimidine is the mother-substance of such bodies, occurring in the animal and vegetable organism, as cytosin, uracil, and thymin. Alloxan, which is an essential component of the purin group, is also a derivative of pyrimidine, and a close relationship thus exists between the purin and pyrimidine bodies.
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In literature:

The nucleic acids are complex compounds consisting of a carbohydrate, phosphoric acid, two purine bases, and two pyrimidine bases.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher

In science:

In this set of experiments the targets are single stranded RNA molecules where some of the pyrimidines (the U and C bases) carry a biotin, while the probes are single stranded DNA molecules.
Comment on: ``Solving the riddle of the bright mismatches: Labeling and effective binding in oligonucleotide arrays"
In brief, while drawing a DNA walk, the corresponding mappings assign a direction/unit vector to each nucleotide, to dinucleotide or to purine (pyrimidine).
Determinative degree and nucleotide sequence analysis by trianders
There are 8 unmixed families (all 4 codons encode the same amino acid), and 8 mixed families for which several patterns of assignment exist, in 6 of the latter the pyrimidine codons (Z = C, U) determine one amino acid, and the purine codons (Z = A, G) determine other ones or termination signals (in one family).
Determinative degree and nucleotide sequence analysis by trianders
The one-dimensional (purine/pyrimidine) DNA walks are deļ¬ned by only one coordinate, while x is chosen as position, i.e.
Determinative degree and nucleotide sequence analysis by trianders
But for simplicity, people usually take them to be binary variables which can be considered as distinguishing only between purines and pyrimidines.
Quasispecies distribution of Eigen model