Mostrando 301 - 320 Resultados de 4,819 Para Buscar 'Pirimidina~', tiempo de consulta: 4.92s Limitar resultados
  1. 301
    por Raczyńska, Ewa Daniela
    Publicado 2023
    “…In this review, the complete tautomeric equilibria are derived for disubstituted pyrimidine nucleic acid bases starting from phenol, aniline, and their model compounds—monosubstituted aromatic azines. …”
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  2. 302
    “…We used the structural template of phosphomethyl pyrimidine kinase from Thermus thermophilus HB8 for modeling the phosphomethyl pyrimidine kinase structure from Leptospira interrogans serovar lai strain 56601 . …”
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  3. 303
    “…This finding supports our previous proposal that important steps in the preparation for DNA synthesis occur during G2 of the previous cell cycle, and it indicates that this preparation is connected to the de novo synthesis of pyrimidine deoxynucleotide precursors. The results show that cells are able to enter S-phase in the presence of 100-1,300 p.p.m. (0.01-0.13%) oxygen (here denoted 'moderate hypoxia'), but they are not able to complete DNA synthesis under such conditions. …”
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  4. 304
    “…Recently, our group synthesized a new series of pyrazolo-triazolo-pyrimidines bearing different substitutions at the N(5) and N(8) positions, which have been described as highly potent and selective human A(3) adenosine receptor antagonists. …”
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  5. 305
  6. 306
    “…BACKGROUND: The genomic fractions of purine (RR) and alternating pyrimidine/purine (YR) stretches of 10 base pairs or more, have been linked to genomic AT content, the formation of different DNA helices, strand-biased gene distribution, DNA structure, and more. …”
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  7. 307
    por Nandy, Ashesh
    Publicado 2009
    “…We report here our observation based on a graphical representation that the intra-purine and intra-pyrimidine differences in sequences of conserved genes generally follow a quadratic distribution relationship and show that this may have arisen from mutations in the sequences over evolutionary time scales. …”
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  8. 308
    “…The title compound, [Cu(C(5)H(3)N(2)O(2))(2)], was prepared in a water–ethanol solution containing 2-cyano­pyrimidine, malonic acid and copper(II) nitrate trihydrate. …”
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  9. 309
  10. 310
  11. 311
    “…In the title compound, C(14)H(15)N(3)OS, the phenyl ring is almost perpendicular to the dimethyl­pyrimidine group, with a dihedral angle of 88.1 (3)°. …”
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  12. 312
    “…In the title compound, C(10)H(4)Cl(4)N(4)O, the pyridine and pyrimidine rings are nearly perpendicular to each other, the dihedral angle between them being 86.60 (10)°. …”
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  13. 313
    “…The Co(II) center is six-coordinated by four N atoms from one bis­[4-(2-pyrid­yl)pyrimidin-2-yl] sulfide (L) ligand and two bromide anions, forming an octa­hedral coordination geometry, where the four donor N atoms are located in the equatorial plane and the Br atoms occupy the axial positions. …”
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  14. 314
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  16. 316
    por Ye, Yu-Yuan, Yang, Kai
    Publicado 2009
    “…In the title compound, C(7)H(9)FN(2)O(2), the meth­oxy and ethyl groups form dihedral angles of 1.4 (2) and 73.5 (3)°, respectively, with the mean plane of the pyrimidine ring. In the crystal structure, two mol­ecules are linked by a pair of N—H⋯O hydrogen bonds, forming a centrosymmetric dimer.…”
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  17. 317
  18. 318
    por Shi, Yang, Zhang, Ru-Fen, Ma, Chun-Lin
    Publicado 2010
    “…In each, the Sn(IV) cation is coordinated by two methyl and two 4,6-dimethyl­pyrimidine-2-thiol­ate anions in a distorted SnS(2)C(2) tetra­hedral geometry. …”
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  19. 319
    “…In the title Schiff base compound, C(12)H(11)BrN(4)O·H(2)O, the organic mol­ecule exists in an E configuration with respect to the C=N double bond. The pyrimidine ring is approximately planar, with a maximum deviation of 0.011 (2) Å, and forms a dihedral angle of 10.68 (8)° with the benzene ring. …”
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  20. 320
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