pyrimidine


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pyrimidine

 [pĭ-rim´ĭ-dēn]
an organic compound that is the fundamental form of the pyrimidine bases, which include cytosine, thymine, and uracil.

py·rim·i·dine (Pyr),

(pī-rim'i-dēn),
1,3-Diazine; a heterocyclic substance, the formal parent of several "bases" present in nucleic acids (uracil, thymine, cytosine) as well as of the barbiturates.

pyrimidine

/py·rim·i·dine/ (pĭ-rim´ĭ-dēn) an organic compound, C4H4N2, the fundamental form of the pyrimidine bases, including uracil, cytosine, and thymine.

pyrimidine

(pī-rĭm′ĭ-dēn′, pĭ-)
n.
1. A single-ringed, crystalline organic base, C4H4N2, that is the parent compound of a large group of biologically important compounds.
2. Any of a group of substituted derivatives of pyrimidine, including the nitrogen bases uracil, cytosine, and thymine, which are components of nucleic acids. Barbiturates and certain other drugs are also pyrimidines.

pyrimidine

[pərim′ədēn]
an organic compound of heterocyclic nitrogen found in nucleic acids and in many drugs, including the antiviral drugs acyclovir, ribavirin, and trifluridine.

py·rim·i·dine

(pir-im'i-dēn)
A heterocyclic substance, the formal parent of several "bases" present in nucleic acids (uracil, thymine, cytosine) as well as of the barbiturates.

pyrimidine

A nitrogenous base compound. Two pyrimidines, cytosine and thymine, are the DNA bases which, with two PURINES, form the genetic code. A third pyrimidine, uracil, takes the place of thymine in RNA.

pyrimidine

one of three types of bases found in NUCLEIC ACIDS, with a single ring structure. DNA contains CYTOSINE and THYMINE, RNA contains cytosine and URACIL. Pyrimidines always pair with PURINES in DNA.

pyrimidine

an organic compound that is the fundamental form of the pyrimidine bases, including uracil, cytosine and thymine.

A pyrimidine
cytosine.
References in periodicals archive ?
The regression equations showed that C15:0 and its isomers clearly correlated with the pyrimidine and total nucleic acid bases contents in the rumen.
Formation of cyclobutane pyrimidine dimers at dipyrimidines containing 5-hydroxymethylcytosine.
For the simultaneous determination of pyrimidines and purines, HPLC is more frequently used, but capillary GC is free from use of expensive solvents and their disposal.
The metabolic pathway genes that highly correlated with variable P7 are enriched in pyrimidine metabolism and methane metabolism.
Douki, "Cyclobutane pyrimidine dimers are predominant DNA lesions in whole human skin exposed to UVA radiation," Proceedings of the National Academy of Sciences of the United States of America, vol.
The variation of Density, Viscosity, Velocity, adiabatic compressibility (Pad), intermodular free length (Lf), relaxation time (X), free volume (Vf), internal pressure (ni), acoustical impedance (Z),constant (W), ultrasonic attenuation ([alpha]/f2), Rao's constant (R), molar volume (Vm), and cohesive energy (CE) of pyrimidine derivatives at 313 K in different concentrations are shown in Figures 1 to 13.
This is supported by the observation that one of these enzymes, DNA polymerase eta (Pol [eta]), supports accurate DNA replication past pyrimidine dimers in vitro.
We also reported a family with severe hereditary pyrimidine 5'-nucleotidase deficiency; in addition, 3 other families were also mentioned (2).
Methotrexate is well known as an inhibitor of dihydrofolate reductase MTX, but it also acts on a number of other enzymes, leading to interference with both purine and pyrimidine pathways and DNA methylation.
The natural base pairs comprise two pairs between purine (A, G) and pyrimidine (T, C) bases, in which the distances between the glycoside bond positions of the pairing bases are constant (10.