Laser-driven quantum magnonics and THz dynamics of the order parameter in antiferromagnets

The impulsive generation of two-magnon modes in antiferromagnets by femtosecond optical pulses, so-called femto-nanomagnons, leads to coherent longitudinal oscillations of the antiferromagnetic order parameter that cannot be described by a thermodynamic Landau-Lifshitz approach. We argue that this dynamics is triggered as a result of a laser-induced modification of the exchange interaction. In order to describe the oscillations we have formulated a quantum mechanical description in terms of magnon pair operators and coherent states. Such an approach allowed us to} derive an effective macroscopic equation of motion for the temporal evolution of the antiferromagnetic order parameter. An implication of the latter is that the photo-induced spin dynamics represents a macroscopic entanglement of pairs of magnons with femtosecond period and nanometer wavelength. By performing magneto-optical pump-probe experiments with 10 femtosecond resolution in the cubic KNiF$_3$ and the uniaxial K$_2$NiF$_4$ collinear Heisenberg antiferromagnets, we observed coherent oscillations at the frequency of 22 THz and 16 THz, respectively. The detected frequencies as a function of the temperature ideally fit the two-magnon excitation up to the N\'eel point. The experimental signals are described as dynamics of magnetic linear dichroism due to longitudinal oscillations of the antiferromagnetic vector.Comment: 25 pages, 10 figure

Studying and modeling of the extraction properties of the natural deep eutectic solvent and sorbitol-based solvents in regard to biologically active substances from Glycyrrhizae roots

The purpose of this work was the studying and modeling of the extraction properties of the sorbitol-based natural deep eutectic solvent (NADES) and sorbitol-based solvents in regard to biologically-active substances (BASs) from Glycyrrhizae roots using theoretical fundamentals based on the laws of statistical physics, thermodynamics, and physical chemistry previously developed by u

Studying and modeling of the extraction properties of the natural deep eutectic solvent and sorbitol-based solvents in regard to biologically active substances from glycyrrhizae roots

The purpose of this work was the studying and modeling of the extraction properties of the sorbitol-based natural deep eutectic solvent (NADES) and sorbitol-based solvents in regard to biologically-active substances (BASs) from Glycyrrhizae roots using theoretical fundamentals based on the laws of statistical physics, thermodynamics, and physical chemistry previously developed by u

An innovative way for extraction of essential oil components from Pimpinella Anisum L. fruits

The aim of this article was to test the hypothesis about the possibility for extraction of essential oil components from the plant raw material (PRM) by the example of Pimpinella anisum L. fruits with two different perfluoro organic solvents, Novec 1230 and Novec 710

Study and modeling of extraction properties of fluoroorganic solvents in regard to low-polar biologically active substances from plant raw materials

The goal of this work was the studying and modelling of the extraction properties of fluoroorganic solvents in regard to low-polar biologically active substances (BAS) from plant raw materials (PRM

Prospects for Drugs Based on the Mitochondria-Targeting Antioxidant SkQ1 in Treatment of Wounds with Impaired Healing

Chronic wounds with impared wound healing that require prolong time for healing remain unsolved problem of modern medicine. Excessive oxidative stress plays an important role in the pathogenesis of chronic wounds caused by aging, diabetes and other pathologies. This review is aimed at the role of mitochondria in oxidative stress and to the future prospects for using the innovative mitochondria targeted antioxidants for treatment of impaired wounds. Recent studies in old mice and mice with type 2 diabetes showed that the mitochondrial antioxidant SkQ1 [10- (6'- plastoquinonyl) decyltriphenylphosphonium] stimulates healing of full-thickness dermal wounds. SkQ1 accelerates inflammatory stage of wound healing, maturation of granulation tissue, angiogenesis and epithelization of wounds. The anti-inflammatory effect of SkQ1 is possibly connected to decreased inflammatory activation of the vascular endothelium, which is typical for aging, diabetes and other pathologies. Local administration of SkQ1 also accelerates wound healing and provides strong anti-inflammatory effect in the model of acute aseptic inflammation. In addition, SkQ1 to stimulate apoptosis of neutrophils and suppresses their activation, as well as suppresses inflammatory activation of mast cells. In the wound model in vitro, SkQ1 accelerates movement of epithelial cells and fibroblasts into the «wound» and stimulates differentiation of human subcutaneous fibroblasts to myofibroblasts. Reviewed data suggest that SkQ1-based topical drugs have a great potential to treat wounds that exhibit impaired healing also in patients suffering from chronic critical illness