Role of Conformational Changes of Hexameric Bacterial Uridine Phosphorylases in Substrate Binding

Crystallography Reports - Crystals of mutants of uridine phosphorylase from Shewanella oneidensis MR-1 at the active-site threonine residue were obtained, and the three-dimensional structures of...     

1-Nucleosides of 5-substituted 4-chloro-1,2,3-triazoles

1-Nucleosides of 5-substituted 4-chloro-1,2,3-triazoles were produced by glycosylation of the corresponding triazoles by the method of fusion with tetra-0-acyl-D-ribofuranose in the presence of bis-p-nitrophenyl phosphate. The structure of the compounds obtained and their conformational peculiarities were studied by the methods of mass spectrometry and NMR spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1556–1564, November, 1984.     

Cyanoacetylation of 6-aminouracils. Synthesis of 7-aminopyrido[2,3-d]pyrimidine-2,4,5-triones

6-Aminouracils and N-substituted derivatives are cyanoacetylated to give 5-cyanoacetyl-6-aminouracils. In the presence of bases these are converted to pyrido[2,3-d]pyrimidine-2,4,5-triones in high yields.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 971–975, July, 1990.     

Study of nitrogen- and sulfur-containing heterocycles. 54. Properties and conversions of pyrimido[4,5-<Emphasis Type="Italic">b</Emphasis>]-1,4-benzothiazepines. Synthesis of a novel heterocyclic system: Pyrimido[5,4-<Emphasis Type="Italic">c</Emphasis>]isoquinoline

We have studied some properties and conversions of pyrimido[4,5-b]-1,4-benzothiazepines: reduction, oxidation, reactions with nucleophilic reagents (methanol, hydrazine, hydroxylamine, o-methylhydroxylamine, and thiosemicarbazide). We have synthesized derivatives of a novel heterocyclic system: pyrimido[5,4-c]isoquinoline.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1863–1872, December, 2004.For Communication 53, see [1].     

Structural Peculiarities of Anomalous Electrolytic Palladium Deposits Prepared under Hydride Formation Conditions

The peculiarities of bulk and surface structures of electrolytic palladium deposits formed under hydride formation conditions are studied by x-ray diffraction (XRD) and x-ray photoelectron spectroscopy techniques. For anomalous deposits with high hydrogen capacities, the evolution of the XRD behavior is traced as a function of thermal treatment. The material is shown to comprise two cubic phases with different lattice parameters.     

A study of nitrogen- and sulfur-containing heterocycles

The reduction of -cyanoacylurethanes in an aqueous medium in the presence of hydrochlorides of aromatic amines and Raney nickel has given -arylaminoacryloyl-and -alkyl--arylaminoacryloylurethanes which have been converted by heating with 10 % aqueous caustic alkalis into 1-aryl-and 5-alkyl-1-aryluracils.For Communication X, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 8, pp. 1088–1091, August, 1970.     

Polynomials in the Differentiation Operator and Formulas for the Sums of Certain Convergent Series

Functional Analysis and Its Applications - Let $$P_n(x)$$ be any polynomial of degree $$n\geq 2$$ with real coefficients such that $$P_n(k)\ne 0$$ for $$k\in\mathbb{Z}$$ . In the paper, in...     

Highly polarized enamines 1. synthesis and some properties ofβ-tetrazolylenamines

A method has been developed for the synthesis of some-tetrazolyl--nitroenamines containing various alkoxy or amino substituents in the a position. It is based on the transformation of a pyrimidine ring by sodium azide.Center for Drug Chemistry, All-Union research Institute of Pharmaceutical Chemistry (VNIKhFI), Moscow 119021 Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 976–980, July, 1994