| 词汇 | pyrimidine |
| 释义 | BETA Examples of pyrimidinepyrimidine isn’t in the Cambridge Dictionary yet. You can help! We have synthesized hairpin templates bearing propynyl pyrimidine residues to examine their effect on template-directed non-enzymatic oligomerization. We report on a plausible prebiotic synthesis of naturally occurring purine and pyrimidine derivatives from formamide under catalytic conditions. Flanking sequence effects within the pyrimidine triple-helix motif characterized by affinity cleaving. An unusually long poly(purine)-poly(pyrimidine) sequence is located upstream from the human thyroglobulin gene. In the pyrimidine motif, the third strand is parallel in polarity to the purine strand of the duplex. However, certain compounds notably the pyrimidines which are absorbed poorly by the host failed to affect the histotropic 4th-stage larvae of the parasite in vivo. As described for other nematodes the anticodon is preceded by a pyrimidine followed by a thymidine and the anticodon is followed by a purine. A transversion is a change from a purine to a pyrimidine or vice versa. Orgel (1987) suggested that some of the original nucleo-bases may not have been purines and pyrimidines. A circular reaction involving synthesis and degradation of purines and pyrimidines based on formamide chemistry has been identified, making plausible an important role of formamide in prebiotic bio-oriented chemistry. Miller et al. (2000b) also have emphasized the likely role of the lysine in stabilizing movement of negative charge from the orotidine carboxyl group to the pyrimidine ring. It belongs to the chemical family of pyrimidines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This enzyme participates in purine metabolism and pyrimidine metabolism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The common characteristics of the novel enzymes are their capability to bypass lesions like pyrimidine dimers. Furthermore, the purine and pyrimidine bases need to be covalently bound, in b-orientation, with the 1k carbon of ribose to form nucleosides. The condensation of nucleo-bases adenine or guanine with sugar ribose gives only minute amounts of nucleosides with correct stereochemistry, and synthesis of pyrimidine nucleosides is even more difficult. Pyrimidine dicarboxamides bind to this side pocket, which increases the selectivity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, later he corrected himself and expanded his initial studies, showing that the end products actually were pyrimidines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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