Cytochrome c(2) serves as the secondary electron donor that reduces the photo-oxidized bacteriochlorophyll dimer in photosynthetic bacteria. Cytochrome c(2) from Rhodobacter sphaeroides has been crystallized in three different forms. At high ionic strength, crystals of a hexagonal space group (P6(1)22) were obtained, while at low ionic strength, triclinic (P1) and tetragonal (P4(1)2(1)2) crysta...

The title compound, (C6H11)3PS (systematic name: tri-cyclo-hexyl-λ5-phosphane-thione), is a triclinic (P-1, Z' = 1) polymorph of the previously reported ortho-rhom-bic form (Pnma, Z' = 1/2) [Kerr et al. (1977 ▸). Can. J. Chem. 55, 3081-3085; Reibenspies et al. (1996 ▸). Z. Kristallogr. 211, 400]. While conformational differences exist between the non-symmetric mol-ecule in the triclinic polymor...

The title compound, C(14)H(12)N(4)O(6)·C(3)H(7)NO, is a monoclinic polymorph of an already published structure [Baughman et al. (2004 ▶). Acta Cryst. C60, 103-106]. In the previously reported structure, the compound crystallized in the triclinic space group P[Formula: see text] (Z = 2), whereas the structure reported here is monoclinic (P2(1)/n, Z = 4). In both forms, two intra-molecular hydrog...

The crystal structure and electronic properties of rhenium disulfide in the triclinic system are investigated using density functional theory pseudopotential theory. calculated primitive cell parameters angles within a local approximation shown to be good agreement with experimental data. It is established that observed direct-gap character related interband transitions at point X. electron ene...

In this work a new ultrafast data collection strategy for electron diffraction tomography is presented that allows reducing data acquisition time by one order of magnitude. This methodology minimizes the radiation damage of beam-sensitive materials, such as microporous materials. This method, combined with the precession of the electron beam, provides high quality data enabling the determinatio...

The classical and quantum mechanics of isolated, nonlinear resonances in integrable systems with N ≥ 2 degrees of freedom is discussed in terms of geometry in the space of action variables. Energy surfaces and frequencies are calculated and graphically presented for invariant tori inside and outside the resonance zone. The quantum mechanical eigenvalues, computed in the semiclassical WKB approx...

In the title hydrated mol-ecular salt, 2C(4)H(16)N(3) (3+)·P(6)O(18) (6-)·2H(2)O, the complete cyclo-hexa-phosphate anion is generated by crystallographic inversion symmetry. The six P atoms of the P(6)O(18) (6-) anion form a chair conformation and the organic cation has a corrugated linear geometry. In the crystal, the cations and the anions are connected by N-H⋯O hydrogen bonds into slabs pro...

Single crystals of the thiamin diphosphate (the vitamin B1 coenzyme)-dependent enzyme pyruvate decarboxylase (EC 4.1.1.1) from brewers' yeast have been grown using polyethylene glycol as a precipitating agent. Crystals of the homotetrameric version alpha 4 of the holoenzyme are triclinic, space group P1, with cell constants a = 81.0, b = 82.4, c = 116.6 A, alpha = 69.5 beta = 72.6, gamma = 62.4...

One of the most widely known representatives apatite family is hydroxyapatite, Ca10(PO4)6(OH)2. This mineral a part human dental and bone tissues, and, therefore, used in medicine. Less oxyapatite, Ca10(PO4)6O, which has same biocompatibility as hydroxyapatite. In this work, it shown that oxyapatite can be obtained by heating hydroxyapatite powder at 1000 °C vacuum. IR NMR spectroscopy proved a...

We present a polarization-resolved, high-resolution Raman scattering study of the three consecutive charge density wave (CDW) regimes in $1T$-TaS$_2$ single crystals, supported by \textit{ab initio} calculations. Our analysis spectra within low-temperature commensurate (C-CDW) regime shows $\mathrm{P3}$ symmetry system, thus excluding previously proposed triclinic stacking "star-of-David" struc...