Author Correction: Discovery of FeO: a new iron oxide with a complex monoclinic structure.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Stability of iron-bearing carbonates in the deep Earth's interior.

The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth's lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained. Here we investigate the behaviour of pure iron carbonate at pressures over 100 GPa and temperatures over 2,500 K using single-crystal X-ray diffraction and Mössbauer spectroscopy in laser-heated diamond anvil cells.

Discovery of Fe7O9: a new iron oxide with a complex monoclinic structure.

Iron oxides are fundamentally important compounds for basic and applied sciences as well as in numerous industrial applications. In this work we report the synthesis and investigation of a new binary iron oxide with the hitherto unknown stoichiometry of Fe7O9. This new oxide was synthesized at high-pressure high-temperature (HP-HT) conditions, and its black single crystals were successfully recovered at ambient conditions.

Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite.

The physical and chemical properties of Earth's mantle, as well as its dynamics and evolution, heavily depend on the phase composition of the region. On the basis of experiments in laser-heated diamond anvil cells, we demonstrate that Fe,Al-bearing bridgmanite (magnesium silicate perovskite) is stable to pressures over 120 GPa and temperatures above 3000 K. Ferric iron stabilizes Fe-rich bridgmanite such that we were able to synthesize pure iron bridgmanite at pressures between ~45 and 110 GPa.

[Spatial structure of isoleucine pentapeptides Glu-Phe-Leu-Arg-Ile-NH2 and Pro-Phe-Tyr-Arg-Ile-NH2].

The spatial structure of two cardioactive isoleucine pentapeptides Glu-Phe-Leu-Arg-Ile-NH2 (I) and Pro-Phe-Tyr-Arg-Ile-NH2 (II) have been investigated using the theoretical conformational analysis. The low-energy conformations of these molecules were found, the values of dihedral angles of the backbone and side chains of the amino acid residues constituting these peptides were determined, and the energies of intra- and interresidual interactions were estimated. It was revealed that the spatial structure of molecule I can exist as five and that of molecule II as seven stable backbone forms.

[Spatial structure of the cardioactive octapeptide].

The spatial structure of the cardioactive octapeptide Pro1-Gln2-Asp3-Pro4-Phe5-Leu6-Arg7-Ile8-NH2 was investigated using the theoretical conformational analysis. The low-energy conformations of the octapeptide molecule were found, the values of dihedral angles of the backbone and side chains of the amino acid residues constituting the peptide were determined, and the energies of intra-and interresidual interactions were estimated. It was shown that the spatial structure of this molecule represent six stable low-energy forms of the main chain.

[Influence of (460 MHz) electromagnetic fields on the induced lipid peroxidation in the structures of visual analyzer and hypothalamus in experimental animals].

Changes in the intensity of ascorbate- and NADPN2-dependent induced lipid peroxidation (LPO) were studied in exposure of the visual analyzer and hypothalamus of 3- and 12-month-old rats to radiation with microwaves of high and low intensity. The exposure to microwaves of high intensity stimulated basal LPO but suppressed activity of LPO-inducing systems. This suggests disturbances in the activity of different sources of active oxygen forms.

[Tertiary structure of myelopeptides. II. Conformational analysis of Phe-Arg-Pro-Arg-Ile-Met-Thr-Pro, Val-Val-Tyr-Pro-Asp, and Val-Asp-Pro-Pro].

Theoretical conformational analysis was used to study the spatial structure and conformational properties of myelopeptides, bone marrow peptide mediators. The low-energy conformations of myelopeptides MP-4 (Phe-Arg-Pro-Arg-Ile-Met-Thr-Pro), MP-5 (Val-Val-Tyr-Pro-Asp), and MP-6 (Val-Asp-Pro-Pro) were found; the values of dihedral angles of backbone and side chains of the amino acid residues were determined; and the energies of intra- and interresidual interactions were estimated.

[Spatial structure of myelopeptides: I. Conformational analysis of MP-1, MP-2, and MP-3].

Theoretical conformational analysis was used to study the spatial structure and conformational properties of myelopeptides, bone-marrow peptide mediators. The low-energy conformations of three hexapeptides MP-1 (Phe-Leu-Gly-Phe-Pro-Thr), MP-2 (Leu-Val-Val-Tyr-Pro-Trp), and MP-3 (Leu-Val-Cys-Tyr-Pro-Gln) were found, the values of dihedral angles of the backbone and side chains of the amino acid residues constituting these peptides were determined, and the energies of intra- and interresidual interactions were estimated.

[Pro- and antioxidant effect of electromagnetic fields of extremely high frequency (460 MHz) on brain tissues in experiment].

The article concerns biological effects of non-ionized electromagnetic irradiation which is considered in modern world as a serious ecological factor. Influence of decimetric microwave irradiation (460 MHz) on free radical processes in the rat brain tissues--visual cortex and hypothalamus--were investigated. Oxidative effects of both lipid peroxidation and specific activity of glutathione reductase were determined.

[Theoretical conformational analysis of cardioactive peptides. II. Nonapeptide Met1-Asn2-Tyr3-Leu4-Ala5-Phe6-Pro7-Arg8-Met9-NH 2].

Theoretical conformational analysis was carried out for the cardioactive nonapeptide Met1-Met9-NH2. Calculations yielded the values of all dihedral angles of the back bone and side chains of the nonapeptide various forms as well as intra- and interresidue interaction energies.

[Theoretical conformational analysis of cardioactive peptides. I. Tetrapeptide Phe1-Met2-Arg3-Phe4-NH2 and pentapeptide Leu1-Pro2-Leu3-Arg4- NH2].

By means of semi-empirical method, an a priori conformational analysis of a cardioactive peptides was carried out. Calculations yielded the values of all dihedral angles of the backbone and side chains of the peptides various forms as well as intra- and interresidue interaction energies.

[Conformation of glycopeptides with L- and D-stereoisomers of Ala and Glu amino acids].

On the base of the semi-empirical method of conformational analysis low-energetic conformations have been found for the glycopeptides with the O-beta-N-acetyl-D-muramic acid or the O-beta-N-acetyl--D-glucosaminyl-(1-4)-N-acetyl-D-muramic acid in the glycan part and L-Ala--D-GluNH2, L-Ala--L-GluNH2, D-Ala--D-GluNH2 in the peptide part. It was shown that for either molecule preferentiability of any conformation is determined mainly by interactions between dipeptide and muramic acid residue.