scholarly journals Study of Endogenous Paramagnetic Centers in Biological Systems from Different Areas

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Aygun Nasibova ◽  
Rovshan Khalilov ◽  
Huseyn Abiyev ◽  
Taras Kavetskyy ◽  
Boris Trubitsin ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Particles ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Biological Systems ◽  
Biological Tissues ◽  
Stress Factors ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Iron Oxide Magnetic Nanoparticles ◽  
Electron Paramagnetic

Plant leaves (Eldar pine (Pinus eldarica M.), fig (Ficus carica L.), and olive (Olea europaea L.)), collected in territories with different ecological conditions, of the Absheron Peninsula (Azerbaijan Republic) were studied by electron paramagnetic resonance spectroscopy (EPR). The generation of nanophase iron oxide magnetic particles in biological systems under the influence of stress factors was revealed. It was found that the process of biomineralization plays a role in the formation of biogenic iron oxide magnetic nanoparticles in plants and the generation of magnetite crystals in biological tissues, and stress factors have a stimulating effect on this phenomenon.

scholarly journals Magnetic Properties of Bacterial Magnetosomes Produced by Magnetospirillum caucaseum SO-1

2021 ◽  
Vol 9 (9) ◽  
pp. 1854
Author(s):  
Kamil G. Gareev ◽  
Denis S. Grouzdev ◽  
Peter V. Kharitonskii ◽  
Demid A. Kirilenko ◽  
Andrei Kosterov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Two Phase ◽  
Paramagnetic Resonance ◽  
Modified Method ◽  
Iron Oxide Magnetic Nanoparticles ◽  
A Minor ◽  
First Time ◽  
Electron Paramagnetic

In this study, the magnetic properties of magnetosomes isolated from lyophilized magnetotactic bacteria Magnetospirillum caucaseum SO-1 were assessed for the first time. The shape and size of magnetosomes and cell fragments were studied by electron microscopy and dynamic light scattering techniques. Phase and elemental composition were analyzed by X-ray and electron diffraction and Raman spectroscopy. Magnetic properties were studied using vibrating sample magnetometry and electron paramagnetic resonance spectroscopy. Theoretical analysis of the magnetic properties was carried out using the model of clusters of magnetostatically interacting two-phase particles and a modified method of moments for a system of dipole–dipole-interacting uniaxial particles. Magnetic properties were controlled mostly by random aggregates of magnetosomes, with a minor contribution from preserved magnetosome chains. Results confirmed the high chemical stability and homogeneity of bacterial magnetosomes in comparison to synthetic iron oxide magnetic nanoparticles.

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