Biochemistry

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purine

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

purine type of organic base found in the nucleotides and nucleic acids of plant and animal tissue. The German chemist Emil Fischer did much of the basic work on purines and introduced the term into the chemical literature in the early 20th cent. The two major purines of almost universal distribution in living systems are adenine and guanine .

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purine

A Dictionary of Biology | 2004 | Copyright

purine An organic nitrogenous base (see formula), sparingly soluble in water, that gives rise to a group of biologically important derivatives, notably adenine and guanine, which occur in nucleotides and nucleic acids (DNA and RNA).

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"purine." A Dictionary of Biology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O6-purine.html

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purine

A Dictionary of Zoology | 1999 | | Copyright

purine A basic, nitrogenous compound that resembles a six-membered pyrimidine ring fused to a five-membered imidazole ring. The two principal purines, adenine and guanine, are major constituents of nucleic acids.

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MICHAEL ALLABY. "purine." A Dictionary of Zoology. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "purine." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-purine.html

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purine

A Dictionary of Plant Sciences | 1998 | | Copyright

purine A basic nitrogenous compound that resembles a 6-membered pyrimidine ring fused to a 5-membered imidazole ring. The 2 principal purines, adenine and guanine, are major constituents of nucleic acids.

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MICHAEL ALLABY. "purine." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "purine." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O7-purine.html

MICHAEL ALLABY. "purine." A Dictionary of Plant Sciences. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-purine.html

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purine

A Dictionary of Ecology | 2004 | | Copyright

purine A nitrogen base composed of two adjoining ring structures, one of which has five members and the other six. The purine bases in the nucleotides of nucleic acids are adenine and guanine.

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MICHAEL ALLABY. "purine." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "purine." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-purine.html

MICHAEL ALLABY. "purine." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-purine.html

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purine

A Dictionary of Nursing | 2008 | Copyright

purine (pewr-reen) n. a nitrogenous compound with a two-ring molecular structure. Examples of purines are adenine and guanine, which occur in nucleic acids, and uric acid.

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"purine." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O62-purine.html

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