La xanthine L'acide urique Histoire. In a more precise chemical description, pyrimidine dimers form from pairs of thymine bases or pairs of cytosine bases in via photochemical reactions. Two pyrimidines, cytosine and thymine, commonly are found in DNA; in RNA, uracil replaces thymine. avec . Definition of pyrimidine in the Fine Dictionary. Meaning of pyrimidine bases as a legal term. What does pyrimidine mean? Most people chose this as the best definition of pyrimidine: A single-ringed, crystall... See the dictionary meaning, pronunciation, and sentence examples. Nucléotide Pyrimidique: Pyrimidines … On ne connaît actuellement qu'une voie de biosynthèse commune ; cette voie part de l'aspartate qui est transformé par trois réactions consécutives en orotate (elle-même une pyrimidine), qui devient … Les bases azotées sont des molécules aromatiques dont le noyau est soit une purine (bases puriques), soit une pyrimidine (bases pyrimidiques). Synthèse des pyrimidines. Information and translations of pyrimidine in the most comprehensive dictionary definitions resource on the web. Example sentences containing pyrimidine The pyrimidine bases are thymine (T) and cytosine (C) in DNA and cytosine (C) and uracil (U) in RNA. Cytosine (C) Pyrimidine. Elles sont présentes au sein de molécules impliquées dans la transduction d'un signal cellulaire, qui correspond au … Definition of pyrimidine bases in the Legal Dictionary - by Free online English dictionary and encyclopedia. Definition of a nucleotide. There are many other nitrogenous bases found in nature, plus the molecules may be found incorporated into other compounds. Elle entre notamment … Le plus simple de ces 2 noyaux, la pyrimidine est une base azotée comportant 2 atomes d'azote et 4 atomes de carbone, le tout formant un cycle hétérogène ou hétérocycle de 6 atomes (Privat de Garilhe, Acides nucl., 1963, p. 14). The nitrogen atoms are placed in the 1 and 3 positions around the ring. Pyrimidine definition is - a feeble organic base C4H4N2 of penetrating odor. Guanine (G) Purine. The pyrimidine bases are thymine (T) and cytosine (C) in DNA and cytosine (C) and uracil (U) in RNA. Quelques mots au hasard. Pyrimidines are one of two biologically important families of nitrogen-containing molecules called nitrogenous bases. base pyrimidique locution Partager sur Facebook; Twitter Email; Définition Synonyme base pyrimidique, locution . Base azotée entrant dans la composition des acides nucléiques de la cellule vivante. pyrimidine base definition in English dictionary, pyrimidine base meaning, synonyms, see also 'pyridine',primine',pyridoxamine'. Les pyrimidines ont un noyau aromatique hexagonal de 4 carbones et 2 azotes. Purines. Learn all about basicity of pyrimidine. reincorporated into nucleotides. Uracil (U) Pyrimidine. [3] Two common UV products are cyclobutane pyrimidine … [1] [2] Ultraviolet light induces the formation of covalent linkages by reactions localized on the C=C double bonds. Définition pyrimidine; Synonyme pyrimidine; Définition pyrimidine. Meaning of pyrimidine with illustrations and photos. For example, pyrimidine rings are found in thiamine (vitamin B1) and barbituates as well as in nucleotides. See more. Two pyrimidines, cytosine and thymine, are the DNA bases which, with two PURINES, form the genetic code. … Class of nucleotides with one ring. … (Figure 4-2) Full glossary ... pyrimidine … Définition Base Pyrimidique. Get detailed, expert explanations on basicity of pyrimidine that can improve your comprehension and help with homework. La guanine (G), une des bases des acides nucléiques, est une purine. La cytosine est constituée d’un noyau pyrimidine dont le carbone 4 est substitué par une fonction amine et le carbone 2 par une fonction cétone. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Reviewed on 12/27/2018. What does pyrimidine bases mean in law? Medical Author: William C. Shiel Jr., MD, FACP, FACR; Pyrimidine: One of the two classes of bases in DNA and RNA. Adenine (A) Purine. traduction pyrimidine base dans le dictionnaire Anglais - Francais de Reverso, voir aussi 'primitive',pyramid',pyramid selling',prim', … Sens 1 . This recycling, however, is not sufficient to meet total body requirements and so some de novo synthesis is essential. Atoms or groups attached to this ring distinguish pyrimidines, which include cytosine, thymine, uracil, thiamine (vitamin B1), uric … List of pyrimidines. De novo … Biologie. Pyrimidines are stabilized by resonance among atoms in the ring, which gives most of the bonds a partial double bond character. Meaning of pyrimidine. Les bases puriques sont au nombre de 2 : l’adénine et la guanine. La base pyrimidique est une molécule azotée hétérocyclique aromatique, présente dans l'ADN et l'ARN. Purine and pyrimidine bases which are not degraded are recycled - i.e. There are definite tissue differences in the ability to carry out de novo synthesis. Base + sugar. Dictionnaire français. Enrich your vocabulary with the English Definition dictionary Base + sugar + phosphate. Définition pyrimidine: La pyrimidine est un composé organique, similaire au benzène, et à la pyridine mais avec deux atomes d'azote qui remplacent le carbone en positions 1 et 3. pyrimidine - WordReference English dictionary, questions, discussion and forums. Definition of Pyrimidine. Définitions. Les bases pyrimidiques sont au nombre de 3 : la cytosine, l’uracile et la thymine. Ultraviolet light (UV) induces the formation of covalent linkages between consecutive bases along the nucleotide chain in the vicinity of their carbon–carbon double bonds. pyrimidines. pyrimidine est employé comme nom féminin singulier. Pronunciation of pyrimidine and its etymology. Employé comme nom. Ces molécules interviennent dans plusieurs réactions chimiques de l'organisme. La thymine est l’une des bases pyrimidiques qui entrent dans la composition des acides nucléiques. All Free. home > pyrimidine Pyrimidine: One of the two classes of bases in DNA and RNA. The merging of the support level and resistance level. Class of nucleotides with two rings. Définition pyrimidine base dans le dictionnaire anglais de définitions de Reverso, synonymes, voir aussi 'pyridine',primine',pyridoxamine', expressions, … It is a... | Meaning, pronunciation, translations and examples pyrimidine A nitrogenous base compound. Recherche d'information médicale. Definition of pyrimidine in the Definitions.net dictionary. Definition of a nucleoside. What is pyrimidine bases? A chart pattern depicting the period when the supply and demand of a certain stock are in relative equilibrium, resulting in a narrow trading range. Elle est la base complémentaire d'une pyrimidine : la thymine (T) (dans l'ADN) ou l'uracile (U) (dans l'ARN). Pyrimidines: Une famille de 6-membered composés hétérocycliques survenant dans la nature, dans une large variété de formes, y compris plusieurs acides nucléiques électeurs (cytosine, thymine ; et uracile) et la forme de la structure de barbituriques. Base A technical analysis tool. Les bases de pryimidine sont composées d'une structure à un seul … La plupart des organismes vivants sont capables de synthétiser naturellement des pyrimidines. La purine est également un composé organique aromatique hétérocyclique composé d'un cycle pyrimidine condensé à un cycle imidazole. Pyrimidine definition, a heterocyclic compound, C4H4N2, that is the basis of several important biochemical substances. Le chimiste allemand Hermann … Pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in DNA via photochemical reactions. Pyrimidine bases may exist in different tautomeric define forms depending on the pH. Base In technical analysis, a situation in which the support level and the resistance level are roughly … A third pyrimidine, uracil, takes the place of thymine in RNA. programmes-cadres - acersocome - jonsonien - ultraroyaliste - ferroferrite - … The dimerization reaction can also occur among pyrimidine bases … Dans une base purique, la pyrimidine est … As a result, pyrimidines are planar molecules and are characterized by strong UV absorption generally near 260 nm. Pyrimidines are also found in some meteorites, although their origin … Les pyrimidines groupent, pour l'azote, un noyau azoté commun à toutes les bases pyrimidiques. Pyrimidines . Pyrimidine bases are weakly basic. Related words - pyrimidine synonyms, antonyms, hypernyms and hyponyms. Elles constituent la base de plusieurs coenzymes ou cofacteurs comme la coenzyme A, le NAD+, ou encore le NADP+. Pyrimidines. 1. en biochimie, composé azoté des bases pyrimidiques. Purines and Pyrimidines are nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA.The two-carbon nitrogen ring bases (adenine and guanine) are purines, while the one-carbon nitrogen ring bases (thymine and cytosine) are pyrimidines. Pyrimidine base definition: any of a number of similar compounds having a basic structure that is derived from... | Meaning, pronunciation, translations and examples Différence clé: La pyrimidine est un composé organique aromatique hétérocyclique composé d’azote et de carbone. Pyrimidine Definition Pyrimidines are simple aromatic compounds composed of carbon and nitrogen atoms in a six-membered ring.. pyrimidines A class of nitrogenous compounds containing one heterocyclic ring. Elle est la base complémentaire d'une pyrimidine : la cytosine (C) (dans l'ADN et l'ARN). A pyrimidine is an organic ring consisting of six atoms: 4 carbon atoms and 2 nitrogen atoms. At neutral pH, pyrimidines … Thymine (T) Pyrimidine. Pyrimidine definition: a liquid or crystalline organic compound with a penetrating odour ; 1,3-diazine. home / medterms medical dictionary a-z list / pyrimidine definition Medical Definition of Pyrimidine. In thiamine ( vitamin B1 ) and barbituates as well as in nucleotides sentences containing pyrimidine! Barbituates as well as in nucleotides medical Author: William C. Shiel Jr. MD... Thymine, commonly are found in thiamine ( vitamin B1 ) and barbituates well. The 1 and 3 positions around the ring, which gives most of the two classes of bases in photochemical... The two classes of bases in via photochemical reactions des pyrimidines in nucleotides 4 carbones 2... Common UV products are cyclobutane pyrimidine … Définition pyrimidine body requirements and so some de synthesis! 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