17 research outputs found
Age-depending peculiarities of ultrastructural myocardium changes caused by experimental hyperuricemia and its combination with hypercholesterolemia
Gladii O., Bodnar Ya., Gudyma A., Trach Rosolovska S. Age-depending peculiarities of ultrastructural myocardium changes caused by experimental hyperuricemia and its combination with hypercholesterolemia. Journal of Education, Health and Sport. 2016;6(11):584-591. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.198743
http://ojs.ukw.edu.pl/index.php/johs/article/view/4055
The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 755 (23.12.2015).
755 Journal of Education, Health and Sport eISSN 2391-8306 7
© The Author (s) 2016;
This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium,
provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License
(http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.
This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial
use, distribution and reproduction in any medium, provided the work is properly cited.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Received: 02.11.2016. Revised 22.11.2016. Accepted: 30.11.2016.
UDC 616.127-091.8-02:616.153.857/.922]-092.9
age-depending peculiarities of ultrastructural myocardium changes caused by experimental hyperuricemia and its combination with hypercholesterolemia
Olena Gladii, Yaroslav Bodnar, Arsen Gudyma, Svitlana Trach Rosolovska
State Higher Educational Establishment
“Ternopil I.Ya.Horbachevsky State Medical University”, Ternopil, Ukraine
Summary
Ultrastructural myocardial changes are the first signs that let characterizing morphological features of various pathological processes morphogenesis, including metabolic cardiomyopathy. It was defined that in animals of pubertal period hyperuricemia and its combination with hypercholesterolemia led to myocardial hyperfunction, which manifested mainly by hyperplasia of different cellular ultrastructures. Among adult animals in modelled metabolic deviations could be noted degenerative myocardial changes that appeared as partial or total organelles destruction.
Key words: myocardium, hyperuricemia, ultrastructure, experiment
Stacking order-dependent sign-change of microwave phase due to eddy currents in nanometer-scale NiFe/Cu heterostructures
International audienceIn the field of spintronics, ferromagnetic/non-magnetic metallic multilayers are core building blocks for emerging technologies. Resonance experiments using stripline transducers are commonly used to characterize and engineer these stacks for applications. Up to now in these experiments, the influence of eddy currents on the excitation of the dynamics of ferromagnetic magnetization below the skin-depth limit was most often neglected. Here, using a coplanar stripline transducer, we experimentally investigated the broadband ferromagnetic resonance response of NiFe/Cu bilayers a few nanometers thick in the sub-skin-depth regime. Asymmetry in the absorption spectrum gradually built up as the excitation frequency and Cu-layer thickness increased. Most significantly, the sign of the asymmetry depended on the stacking order. Experimental data were consistent with a quantitative analysis considering eddy currents generated in the Cu layers and the subsequent phaseshift of the feedback magnetic field generated by the eddy currents. These results extend our understanding of the impact of eddy currents below the microwave magnetic skin-depth and explain the lineshape asymmetry and phase lags reported in stripline experiments
Determining Key Spin-Orbitronic Parameters via Propagating Spin Waves
International audienceWe characterize spin-wave propagation and its modification by an electrical current in permalloy(Py)/Pt bilayers with Py thickness between 4 and 20 nm. First, we analyze the frequency nonreciprocity of surface spin waves and extract from it the interfacial Dzyaloshinskii-Moriya interaction constant D s accounting for an additional contribution due to asymmetric surface anisotropies. Second, we measure the spin-wave relaxation rate and deduce from it the Py/Pt spin-mixing conductance g ↑↓ eff. Last, applying a dc electrical current, we extract the spin Hall conductivity σ SH from the change of spin-wave relaxation rate due to the spin Hall spin-transfer torque. We obtain a consistent picture of the spin-wave propagation data for different film thicknesses using a single set of parameters D s = 0.25 pJ/m, g ↑↓ eff = 3.2 × 10 19 m −2 and σ SH = 4 × 10 5 S/m
Unraveling the influence of electronic and magnonic spin-current injection near the magnetic ordering transition of IrMn metallic antiferromagnets
International audienceAlthough spin injection at room temperature in an IrMn metallic antiferromagnet strongly depends on the transport regime, and is more efficient in the case of magnonic transport, in this article, we present experimental data demonstrating that the enhanced efficiency of spin injection caused by spin fluctuations near the ordering temperature can be as efficient for the electronic and magnonic transport regimes. By selecting representative interacting environments, we also demonstrated that the amplification of spin injection near the ordering temperature of the IrMn antiferromagnet is independent of exchange coupling with an adjacent NiFe ferromagnet. In addition, our findings confirm that the spin current carried by magnons penetrates deeper than that transported by conduction electrons in IrMn. Finally, our data indicates that the value of the ordering temperature for the IrMn antiferromagnet is not significantly affected by either the electronic or magnonic nature of the spin-current probe, or by exchange coupling
Spin-wave propagation and spin-polarized electron transport in single-crystal iron films
Penetration depth of Cooper pairs in the IrMn antiferromagnet
Suppression of superconductivity due to the proximity effect between a superconductor and a ferromagnet can be partially alleviated when a Cooper pair simultaneously samples different directions of the short-range exchange field. The superconductor's critical temperature, TC, is therefore expected to partially recover when the ferromagnet is in a multi-domain state, as opposed to a single-domain state. Here, we discuss series of experiments performed with ferromagnet(Pt/Co)/spacer(IrMn and Pt)/superconductor(NbN) heterostructures. By tuning the various parameters in play, e.g., superconducting coherence length-to-thicknesses ratio, and domain sizes, we obtained up to 10% recovery of the superconducting critical temperature ΔTC/TC. This large-scale recovery made novel investigations possible. In particular, from the spacer thickness-dependence of ΔTC/TC, it was possible to deduce the characteristic length for Cooper pair penetration in an IrMn antiferromagnet. This information is crucial for electronic transport, and up to now has been difficult to access experimentally for antiferromagnets