Chronic Electro-Acoustic Stimulation May Interfere With Electric Threshold Recovery After Cochlear Implantation in the Aged Guinea Pig.

Objectives: Electro-acoustic stimulation (EAS) combines electric stimulation via a cochlear implant (CI) with residual low-frequency acoustic hearing, with benefits for music appreciation and speech perception in noise. However, many EAS CI users lose residual acoustic hearing, reducing this benefit. The main objectives of this study were to determine whether chronic EAS leads to more hearing loss compared with CI surgery alone in an aged guinea pig model, and to assess the relationship of any hearing loss to histology measures.

Mental health of children with special educational needs in the context of long-term crisis challenges: as seen by parents.

Objective: Aim: To study the peculiarities of the mental health of children with special educational needs after 1.5 years of full-scale war in Ukraine.

Patients And Methods: Materials and Methods: The mental health of children with special educational needs (SEN) as well as the peculiarities of the impact of hostilities on their emotional and volitional sphere was assessed through the anonymous survey of their parents using the questionnaire developed by the authors (25 questions).

Hybrid compound based on diethylenetriaminecopper(ii) cations and scarce V-monosubstituted β-octamolybdate as water oxidation catalyst.

Herein, we report on a new hybrid compound (NH){[Cu(dien)(HO)][β-VMoO]}·1.5HO (1), where dien = diethylenetriamine, containing an extremely rare mixed-metal pseudo-octamolybdate cluster. An EPR spectroscopy provided insights into the formation of paramagnetic species in reaction mixture and in solution of 1.

Hybrid Cu-Containing Compounds Based on Lacunary Strandberg Anions: Synthesis under Mild Conditions, Crystal Structure, and Magnetic Properties.

A one-pot reaction of a copper source (metallic powder Cu or Cu salts) and bpy (bpy = 2,2'-bipyridine) in the presence of (NH)HPO and (NH)MoO·4HO yields heterometallic hybrid compounds of the general type {[Cu(bpy)(HO)][PMoO]}. The structures exhibit a number of phosphomolybdate POMs including not only a common Strandberg anion [PMoO] but also its unprecedented bi- and trilacunary derivatives [PMoO] and [PMoO]. The structural determinants including the metal source (copper powder copper salts), counterion of the salts, and stoichiometry of the reagents were examined.

Impact of Deuteration and Temperature on Furan Ring Dynamics.

Despite significant progress in conformational analysis of cyclic molecules, the number of computational studies is still limited while most of that available in the literature data have been obtained long time ago with outdated methods. In present research, we have studied temperature driven conformational changes of the furan ring at three different temperatures. Additionally, the effect of deuteration on the ring dynamics is discussed; in addition, the aromaticity indices following the Bird and HOMA schemes are computed along all trajectories.

Remote pacemaker control of chimera states in multilayer networks of neurons.

Networks of coupled nonlinear oscillators allow for the formation of nontrivial partially synchronized spatiotemporal patterns, such as chimera states, in which there are coexisting coherent (synchronized) and incoherent (desynchronized) domains. These complementary domains form spontaneously, and it is impossible to predict where the synchronized group will be positioned within the network. Therefore, possible ways to control the spatial position of the coherent and incoherent groups forming the chimera states are of high current interest.

Structural anomalies in brain networks induce dynamical pacemaker effects.

Dynamical effects on healthy brains and brains affected by tumor are investigated via numerical simulations. The brains are modeled as multilayer networks consisting of neuronal oscillators whose connectivities are extracted from Magnetic Resonance Imaging (MRI) data. The numerical results demonstrate that the healthy brain presents chimera-like states where regions with high white matter concentrations in the direction connecting the two hemispheres act as the coherent domain, while the rest of the brain presents incoherent oscillations.

Effect of topology upon relay synchronization in triplex neuronal networks.

Relay synchronization in complex networks is characterized by the synchronization of remote parts of the network due to their interaction via a relay. In multilayer networks, distant layers that are not connected directly can synchronize due to signal propagation via relay layers. In this work, we investigate relay synchronization of partial synchronization patterns like chimera states in three-layer networks of interacting FitzHugh-Nagumo oscillators.

Two populations of coupled quadratic maps exhibit a plentitude of symmetric and symmetry broken dynamics.

We numerically study a network of two identical populations of identical real-valued quadratic maps. Upon variation of the coupling strengths within and across populations, the network exhibits a rich variety of distinct dynamics. The maps in individual populations can be synchronized or desynchronized.

A binuclear Cu/Ca thio-cyanate complex with a Schiff base ligand derived from -vanillin and ammonia.

The new heterometallic complex, aqua-1κ-bis-(μ-2-imino-methyl-6-meth-oxy-phenolato-1κ , :2κ ,)bis-(thio-cyanato-1κ)calcium(II)copper(II), [CaCu(CHNO)(NCS)(HO)], has been synthesized using a one-pot reaction of copper powder, calcium oxide, -vanillin and ammonium thio-cyanate in methanol under ambient conditions. The Schiff base ligand (CHNO) is generated from the condensation of -vanillin and ammonia, which is released from the initial NHSCN. The title compound consists of a discrete binuclear mol-ecule with a {Cu(μ-O)Ca} core, in which the Cu⋯Ca distance is 3.

Crystal structure of poly[(μ-4-amino-1,2,5-oxa-diazole-3-hydroxamato)thallium(I)].

The title compound represents the thallium(I) salt of a substituted 1,2,5-oxa-diazole, [Tl(CHNO)] , with amino- and hydroxamate groups in the 4- and 3- positions of the oxa-diazole ring, respectively. In the crystal, the deprotonated hydroxamate group represents an inter-mediate between the keto/enol tautomers and forms a five-membered chelate ring with the thallium(I) cation. The coordination sphere of the cation is augmented to a distorted disphenoid by two monodentately binding O atoms from two adjacent anions, leading to the formation of zigzag chains extending parallel to the axis.

Aminofluoresceins Versus Fluorescein: Peculiarity of Fluorescence.

In this article, we examined the fluorescent properties of 4'- and 5'-aminofluorescein, unsubstituted fluorescein, and its 4'-nitro derivative in a set of solvent systems. Fluorescence lifetimes, quantum yields, time-resolved fluorescence spectra, and quantum chemical calculations allowed clarifying the reasons of the emitting properties in this dye series. In water, the dianions R of aminofluoresceins are practically nonfluorescent; in alcohols, the quantum yields are low.

Aminofluoresceins Versus Fluorescein: Ascertained New Unusual Features of Tautomerism and Dissociation of Hydroxyxanthene Dyes in Solution.

Within the course of this spectroscopic research, we revealed novel features of the protolytic behavior, which extend the knowledge of the chemistry of xanthene dyes and rationalize the utilization of these compounds. In addition to the well-known tautomerism of the molecular form, HR, of fluorescein dyes, new aspects of tautomeric transformation of anions are disclosed. First, for the dyes bearing the substituents in the phthalic acid residue, 4'- and 5'-aminofluoresceins and 4'-fluorescein isothiocyanate, the monoanion HR exists in non-hydrogen-bond donor solvents not only as a tautomer with the ionized carboxylic and nonionized OH group but also as a "phenolate" ion with a nonionized COOH group.

Complex partial synchronization patterns in networks of delay-coupled neurons.

We study the spatio-temporal dynamics of a multiplex network of delay-coupled FitzHugh-Nagumo oscillators with non-local and fractal connectivities. Apart from chimera states, a new regime of coexistence of slow and fast oscillations is found. An analytical explanation for the emergence of such coexisting partial synchronization patterns is given.

Controlling chimera states via minimal coupling modification.

We propose a method to control chimera states in a ring-shaped network of nonlocally coupled phase oscillators. This method acts exclusively on the network's connectivity. Using the idea of a pacemaker oscillator, we investigate which is the minimal action needed to control chimeras.

About the Aromaticity of symm-Triaminotrinitrobenzene.

Aromaticity and structural features of the isolated symm-triaminotrinitrobenzene (TATB) were examined using the nonempirical ab initio quantum chemical method and molecular dynamics at the Car-Parrinello level. Different criteria of the aromaticity were combined with the study of conformational flexibility of molecule and analysis of the electron density distribution. It was found that the cooperative effect of the resonance-assisted hydrogen bonds results in the ultimate decreasing aromaticity of the benzene ring in TATB.

Robustness of chimera states in nonlocally coupled networks of nonidentical logistic maps.

We investigate the dynamics of nonlocally coupled time-discrete maps with emphasis on the occurrence and robustness of chimera states. These peculiar, hybrid states are characterized by a coexistence of coherent and incoherent regions. We consider logistic maps coupled on a one-dimensional ring with finite coupling radius.

Chimera states in brain networks: Empirical neural vs. modular fractal connectivity.

Complex spatiotemporal patterns, called chimera states, consist of coexisting coherent and incoherent domains and can be observed in networks of coupled oscillators. The interplay of synchrony and asynchrony in complex brain networks is an important aspect in studies of both the brain function and disease. We analyse the collective dynamics of FitzHugh-Nagumo neurons in complex networks motivated by its potential application to epileptology and epilepsy surgery.

Optimal design of tweezer control for chimera states.

Chimera states are complex spatio-temporal patterns which consist of coexisting domains of spatially coherent and incoherent dynamics in systems of coupled oscillators. In small networks, chimera states usually exhibit short lifetimes and erratic drifting of the spatial position of the incoherent domain. A tweezer feedback control scheme can stabilize and fix the position of chimera states.

Details make the difference: a family of tetranuclear CuMn complexes with cube-like and double open cube-like cores.

The "direct synthesis" approach, namely one-pot reaction of metal powders and ammonium salt with a methanol solution of a polydentate Schiff base (HL) formed in situ from salicylaldehyde and ethanolamine, has been successfully used for the preparation of the new heterometallic compounds [CuMn(L)(CHOH)]I (1), [CuMn(L)(CHOH)(HO)]NCS·HO (2), [CuMn(L)(CHOH)(HO)]Br·0.45HO (3) and [CuMn(L)(HO)]BF·0.6HO (4).