Stability of Optical Responses from Lead-free Perovskite Films

Optics and Spectroscopy - Materials with perovskite-type crystal structure attract much attention due to their unique optical properties, such as high quantum yield of photoluminescence and high...     

On the Effect of Products Made from Recombinant Spidroin Protein on Wound Regeneration in an Experiment

Preparations based on recombinant spidroin protein were studied. A stimulating effect of the studied recombinant proteins on wound repair both in vitro and in vivo was revealed. The greatest positive effect in vivo was observed in the case of the use of MMSC cultures. The optimal period of application of spidroin samples was determined to be the early term of reparation after a trauma or burn.     

Liposomal Co-Encapsulation of Two Novel Europium Complexes and Doxorubicin: Fluorescence Study

The present study was undertaken to design the novel liposomal drug formulation containing doxorubicin and europium coordination complexes. It was shown that co-encapsulation of the drugs facilitates the partitioning and permeation of lanthanides into the lipid bilayer. The obtained results suggest that new drug platform may have potential application in the design of novel antitumor agents.     

Obtaining of images of ordered and disordered nanocrystal structures by atomic force microscopy

The morphology of films, superlattices, and other structures of colloidal nanocrystals has been investigated by atomic force microscopy (AFM). The capabilities of ultrasharp and conventional probes for AFM are compared. The problems of detection of nanocrystal close packing are discussed.     

Determination of diffusion coefficients for sulfide ions in solid electrolytes on the basis of BaSm<Subscript>2</Subscript>S<Subscript>4</Subscript> and CaGd<Subscript>2</Subscript>S<Subscript>4</Subscript>

Coefficients of self-diffusion and coefficients of diffusion of the sulfur ion in solid electrolytes BaSm₂S₄ and CaGd₂S₄ are determined with recourse to methods of conductimetry and potentiostatic chronoamperometry. A vacancy mechanism for the defect formation in solid solutions on the basis of barium thiosamarate and calcium thiogadolynate is proposed.     

Electrochemical Methods for Studying Transport Properties and the Type of Ionic Conduction in Solid Electrolytes Based on CaPr<Subscript>2</Subscript>S<Subscript>4</Subscript> and Ca(Ba)Sm<Subscript>2</Subscript>S<Subscript>4</Subscript>

The theoretical feasibility of sulfide ion transport in phases based on MeLn₂S₄ (Me = Ca, Ba; Ln = Sm, Pr) is considered. Regions of solid solutions on the basis of ternary compounds are determined. A systematic investigation of phases is performed with the application of a variety of electrochemical methods, specifically, the conductimetry, emf in chemical concentration cells with and without transport, and Tubandt methods.__________Translated from Elektrokhimiya, Vol. 41, No. 6, 2005, pp. 707–713.Original Russian Text Copyright © 2005 by Ushakova, Kalinina, Fominykh, Yurlov, Murin.Published on the basis of a report delivered at the VII Meeting on Fundamental Problems in Solid-State Ionics (Chernogolovka-2004).     

A study of sorption and decomposition of ozone on microfibrous filtering materials

Decomposition of ozone on commercial and pilot filtering microfibrous materials based on polymers, glass fibers, and carbonized polymeric fibers was studied. Original Russian Text A.I. Klimuk, L.A. Obvintseva, A.D. Shepelev, V.L. Kuchaev, M.P. Dmitrieva, E.N. Ushakova, A.K. Avetisov, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 4, pp. 593–597.     

Nano Carrier Drug Delivery Systems for the Treatment of Neuropsychiatric Disorders: Advantages and Limitations

Neuropsychiatric diseases are one of the main causes of disability, affecting millions of people. Various drugs are used for its treatment, although no effective therapy has been found yet. The blood brain barrier (BBB) significantly complicates drugs delivery to the target cells in the brain tissues. One of the problem-solving methods is the usage of nanocontainer systems. In this review we summarized the data about nanoparticles drug delivery systems and their application for the treatment of neuropsychiatric disorders. Firstly, we described and characterized types of nanocarriers: inorganic nanoparticles, polymeric and lipid nanocarriers, their advantages and disadvantages. We discussed ways to interact with nerve tissue and methods of BBB penetration. We provided a summary of nanotechnology-based pharmacotherapy of schizophrenia, bipolar disorder, depression, anxiety disorder and Alzheimer’s disease, where development of nanocontainer drugs derives the most active. We described various experimental drugs for the treatment of Alzheimer’s disease that include vector nanocontainers targeted on β-amyloid or tau-protein. Integrally, nanoparticles can substantially improve the drug delivery as its implication can increase BBB permeability, the pharmacodynamics and bioavailability of applied drugs. Thus, nanotechnology is anticipated to overcome the limitations of existing pharmacotherapy of psychiatric disorders and to effectively combine various treatment modalities in that direction.     

Relaxation of strains in fibrillar porous carbon dioxide saturated media near their critical point

The isothermal relaxation of strains in deformed fibrillar porous layers saturated with subcritical or supercritical carbon dioxide has been studied at different temperatures by full-field speckle correlometry. The relaxation of strains is produced by the porous layer—fluid transition of a system from one equilibrium thermodynamic state to another due to a jump-like change in pressure. It has been established that the relaxation time attains a maximum near a critical point and rapidly decreases with increasing deviation of the system temperature from its critical value. The mechanisms of hydrodynamic relaxation in the density of a fluid layer and viscoelastic relaxation in a porous matrix are discussed. It is shown that the experimentally observed slow relaxation of a system is due to the viscoelastic relaxation of a porous fluid saturated layer at equal fluid densities inside and outside the layer.