The title structure, C6H9.5N3O2 (0.5+)·C7H6.5NO2 (0.5-), which might be named schematically as 2-amino-4,6-di-meth-oxy-pyrimidine-(μ2-hydrogen)-4-amino-benzoate to indicate a bridging H atom, has been redetermined from the data published by Thanigaimani, Mu-thiah & Lynch [Acta Cryst. (2006), E62, o2976-o2978]. The improvement of the present redetermination… (More)
The title salt, C4H6N3O(+)·C4H3O4 (-)·C4H5N3O, has been redetermined from the data published by Benali-Cherif, Falek & Direm [Acta Cryst. (2009), E65, o3058-o3059]. The improvement of the present redetermination consists in the discovery of the splitting of one of the H atoms into two disordered positions, the occupancies of which are equal to 0.55 (2) and… (More)
A proposed optimization model deals with the problem of reserves for the functional components-parts of mechanism in order to increase its reliability. The following factors are taken into consideration: the probability of the failure-free run of a part without a reserve, the probability of the failure-free run of a part with a reserve, the mean value of… (More)
Faeces examination of hospitalised paediatric patients with respiratory diseases (recurrent and chronic bronchitis, bronchial asthma, contact with TBC, active TBC, rhinopharyngitis, bronchitis, pneumonia, cystic fibrosis, fluidothorax, pleuropneumonia) revealed the total prevalence of endoparasites of 19.85 %, out of which the prevalence of helminth was… (More)
In the title compound, C(2)H(7)N(4)O(+)·BF(4) (-), inter-molecular N-H⋯O hydrogen bonds connect the cations into chains parallel to the c axis, with graph-set motif C(4). These chains are in turn connected into a three-dimensional network by inter-molecular N-H⋯F hydrogen bonds. The B-F distances distances in the anion are not equal.
The title structure, 3C(2)H(7)N(4)O(+)·HFPO(3) (-)·FPO(3) (2-)·H(2)O, contains three independent 2-carbamoylguanidinium cations, one fluoro-phospho-nate, one hydrogen fluoro-phospho-nate and one water mol-ecule. There are three different layers in the structure that are nearly perpendicular to the c axis. Each layer contains a cation and the layers differ… (More)
The title compound, K(2)Zn(IO(3))(4)·2H(2)O, contains two symmetry-independent K and I atoms. These atoms, as well as the Zn atom, are coordinated by shared O atoms and, moreover, the Zn atom is coordinated by two water mol-ecules in trans positions. The K, Zn and water O atoms atoms are situated in special positions on twofold symmetry axes. The hydrogen… (More)