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Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2022 Jun 14. Epub 2022 Jun 14.

Faculty of Biomedical Engineering, Czech Technical University in Prague, Czech Republic.

The purpose of this study is to provide an overview of the replacements used in lost vision in the form of the bionic eye, to show their deficiencies and outline other possibilities for non-invasive stimulation of functional areas of the visual cortex. The review highlights the damage not only to the primary altered cellular structures, but also to all other horizontally and vertically localised structures. Based on the results of a large number of functional magnetic resonance imaging and electrophysiological methods, the authors focus on the pathology of the entire visual pathway in pigmentary retinopathy (PR) and age-related macular degeneration (AMD). Read More

Rev Fac Cien Med Univ Nac Cordoba 2022 06 6;79(2):141-145. Epub 2022 Jun 6.

Universidad de Cartagena.

Introduction: Necrosis or hemorrhage associated with pituitary tumors is an infrequent complication. The term pituitary apoplexy is related to the development of an inflammatory process that leads to irritation of the meningeal and periselar areas. Regardless of the mechanism (hemorrhage or infarction), the extent of the hemorrhage and necrosis will produce an increase in intraselar pressure which, in turn, will lead to a more or less pronounced compression of neighboring structures, thus explaining the broad spectrum clinical. Read More

Acta Crystallogr C Struct Chem 2022 06 17;78(Pt 6):351-359. Epub 2022 May 17.

Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein 9301, South Africa.

Two rhenium complexes, namely, fac-tricarbonyl(triphenylphosphane-κP)(tropolonato-κO,O')rhenium(I), [Re(CHO)(CHP)(CO)] or fac-[Re(Trop)(PPh)(CO)] (1), and fac-tricarbonyl(3,5,7-tribromotropolonato-κO,O')(triphenylphosphane-κP)rhenium(I), [Re(CHBrO)(CHP)(CO)] or fac-[Re(TropBr)(PPh)(CO)] (2) (TropH is tropolone and and TropBrH is tribromotropolone), were synthesized and their crystal and molecular structures confirmed by single-crystal X-ray diffraction. Both crystallized in the space group P-1 and display an array of inter- and intramolecular interactions which were confirmed by solid-state C NMR spectroscopy using cross polarization magic angle spinning (CPMAS) techniques, as well as Hirshfeld surface analysis. The slightly longer Re-P distance of 1 [2. Read More

RSC Adv 2021 Nov 18;11(59):37181-37193. Epub 2021 Nov 18.

Universidad Andres Bello, Programa de Doctorado en Físicoquímica Molecular, Facultad de Ciencias Exactas Santiago Chile

Over the last few years, luminescent Re(i) tricarbonyl complexes have been increasingly proposed as fluorophores suitable for fluorescence microscopy to visualize biological structures and cells. In this sense, incorporating an asymmetrical pyridine Schiff base (PSB) as the ancillary ligand strongly modifies the staining and luminescent properties of Re(i) tricarbonyl complexes. In this work, we analyzed two series of Re(i) tricarbonyl complexes with their respective PSB ligands: (1) -[Re(CO)(2,2'-bpy)(PSB)] and (2) -[Re(CO)(4,4'-bis(ethoxycarbonyl)-2,2'-bpy)(PSB)], where the PSB exhibits substitutions at positions 4 or 6 in the phenolic ring with methyl or halogen substituents. Read More

RSC Adv 2021 Jul 13;11(39):24443-24455. Epub 2021 Jul 13.

Department of Chemistry, University of the Free State PO Box 339 Bloemfontein 9300 South Africa

A series of seven -[Re(CO)(5Me-Sal-Trypt)(L)] complexes containing tryptamine on the , 5-methyl-salicylidene bidentate ligand backbone and where L is MeOH, Py, Imi, DMAP, PPh coordinated to the 6th position have been studied, including the formation of a dinuclear Re cluster. The crystallographic solid state structures show marked similarity in structural tendency, in particular the rigidity of the Re core and the hydrogen bond interactions similar to those found in protein structures. The rates of formation and stability of the complexes were evaluated by rapid time-resolved stopped-flow techniques and the methanol substitution reaction indicates the significant activation induced by the use of the , salicylidene bidentate ligand as manifested by the second-order rate constants for the entering nucleophiles. Read More