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- Ivanov, Alexander V., et al.
(författare)
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Adducts of zinc and copper(II) morpholinedithiocarbamate complexes with morpholine of the composition [M(Mf)(MfDtC)(2)] and [M(Mf)(MfDtC)(2)]center dot Mf: Synthesis, thermal analysis, EPR, and CP/MAS C-13 NMR
- 2003
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Ingår i: Russian Journal of Inorganic Chemistry. - 0036-0236 .- 1531-8613. ; 48:3, s. 415-421
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Tidskriftsartikel (refereegranskat)abstract
- The zinc and copper(II) morpholineditiohcarbamate complexes [M-2(MfDtc)(4)] and their adducts with morpholine [M(Mf)(MfDtc)(2)], including the solvated forms [M(Mf)(MfDtc)(2)] . Mf (M = Zn, Cu-63, Cu-65), have been synthesized and characterized by thermal analysis, EPR, and CP/MAS C-13 NMR data. Upon thermal destruction, the initial complexes, their adducts, and solvated forms lose weight in one, two, and three steps, respectively. The ultimate products of the thermal destruction of these complexes are zinc and copper sulfides. The range of the thermal destruction of the "dithiocarbamate part" is progressively shifted to lower temperatures in going from the initial binuclear complexes to their adducts and solvated forms. EPR shows that the geometry of the [CuS4N] chromophore in the [Cu(Mf)(MfDtc)(2)] adduct is close to square-pyramidal, the unpaired electron being predominantly localized in the metal 3d(x2-y2) AO. The outer-sphere solvation of the adduct is accompanied by structural reorganization at the molecular level. This reorganization involves a distortion of the [CuS4] base of the square-pyramidal polyhedron [CuS4N] toward a trigonal bipyramid. C-13 NMR shows that all of the zinc complexes under consideration are characterized by intramolecular nonequivalence of dithiocarbamate ligands. The N-15 NMR spectra adequately reflect the difference in the structural functions of pairs of dithiocarbamate ligands in [Zn-2(MfDtc)(4)].
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- Kameneva, P, et al.
(författare)
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Serotonin limits generation of chromaffin cells during adrenal organ development
- 2022
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Ingår i: Nature communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 13:1, s. 2901-
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Tidskriftsartikel (refereegranskat)abstract
- Adrenal glands are the major organs releasing catecholamines and regulating our stress response. The mechanisms balancing generation of adrenergic chromaffin cells and protecting against neuroblastoma tumors are still enigmatic. Here we revealed that serotonin (5HT) controls the numbers of chromaffin cells by acting upon their immediate progenitor “bridge” cells via 5-hydroxytryptamine receptor 3A (HTR3A), and the aggressive HTR3Ahigh human neuroblastoma cell lines reduce proliferation in response to HTR3A-specific agonists. In embryos (in vivo), the physiological increase of 5HT caused a prolongation of the cell cycle in “bridge” progenitors leading to a smaller chromaffin population and changing the balance of hormones and behavioral patterns in adulthood. These behavioral effects and smaller adrenals were mirrored in the progeny of pregnant female mice subjected to experimental stress, suggesting a maternal-fetal link that controls developmental adaptations. Finally, these results corresponded to a size-distribution of adrenals found in wild rodents with different coping strategies.
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- Mel’nikova, Elena A.
(författare)
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A New Runic Inscription from Hagia Sophia Cathedral in Istanbul
- 2016
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Ingår i: Futhark. - Oslo, Uppsala : Uppsala universitet. - 1892-0950 .- 1892-0950. ; 7, s. 101-110
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Tidskriftsartikel (refereegranskat)abstract
- During the investigation of the interior of Hagia Sophia Cathedral in Istanbul in search of Cyrillic inscriptions, Russian epigraphists discovered an inscription that was later identified as comprised of Scandinavian runes. In 2011, the present author had the opportunity to study it herself. The inscription is located on a marble windowsill in the eastern wall of the northern first floor gallery, a sill covered with many Cyrillic (mostly of the second half of the twelfth to the mid-thirteenth century) and Greek graffiti. The c. 27 cm long line of runes reads a͡rịṇba͡rþrr͡aṣṭruna͡rþasi, Old Norse Arinbárðr rеist rúnar þessar [older: þā(ʀ)si], ‘Arinbárðr cut these runes’. The inscription appears to be cut fairly regularly but demonstrates some paleographic idiosyncrasies, e.g. all r-runes (also in a͡r) have sharply pointed tops. Some distinctive features include the consistent usage of the bind-rune a͡r whenever a combination of a and r is employed (four times, once for r͡a) and the absence of the ʀ-rune in older rūnaʀ. Though neither peculiarity provides firm grounds for dating the inscription, it was most probably produced in the second half of the eleventh or first half of the twelfth century and most likely carved by a Scandinavian mercenary in the service of the Byzantine emperor.
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