Magnetic Properties of Bacterial Nanoparticles

Τimko, M.; Džarová, A.; Kováč, J.; Kopčanský, P.; Gojżewski, Hubert; Szlaferek, A.

doi:10.12693/aphyspola.115.381

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…As it was shown in our previous paper [20], coercive force is practically temperature independent above the Verwey transition (T V ¼105 K) and increases by a factor 4 below this transition. The increase in H c below T V reflects the large increase in the magnetocrystalline anisotropy in the cubic-monoclinic phase transition at the Verwey transition.…”

Section: Structural and Magnetic Studiessupporting

confidence: 75%

Magneto-optical study of magnetite nanoparticles prepared by chemical and biomineralization process

Džarová¹,

Τimko²,

Jamon³

et al. 2011

Journal of Magnetism and Magnetic Materials

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Section: Structural and Magnetic Studiessupporting

confidence: 75%

Magneto-optical study of magnetite nanoparticles prepared by chemical and biomineralization process

Džarová¹,

Τimko²,

Jamon³

et al. 2011

Journal of Magnetism and Magnetic Materials

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“…Their function as a cellular compass to navigate along the geomagnetic field is well known (Komeili, ; Faivre and Schueler, ). Additionally, magnetosomes have a tendency to form chain‐like structures and, after isolation, close‐loop structures (Timko et al ., ). Moreover, the magnetic characteristics of the magnetosomes are unique and completely different from that observed for larger particles (Albrecht et al, ; Eberbeck et al ., ; Hergt et al ., ; Han et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Magnetosomes on surface: an imaging study approach

et al. 2011

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In this study, we deposited isolated magnetosomes from magnetotactic bacteria Magnetospirillum strain AMB-1 onto solid surfaces using spin coating (SC) and drop coating (DC) techniques. Four imaging techniques have been used to visualize the sample structure: scanning and transmission electron microscopy (SEM, TEM), atomic and magnetic force microscopy (AFM, MFM). Additionally, dynamic light scattering was applied to measure the hydrodynamic radius of agglomerated/aggregated magnetosomes in a liquid environment. This manuscript discusses observed differences between structures obtained by two deposition techniques, i.e. possible interactions and factors responsible for magnetosomes' formation, their morphology on surfaces as a result of agglomeration and aggregation phenomena. Moreover, topography and homogeneity of obtained structures as well as thickness of protein-based membrane were also examined and described. Using high-resolution TEM, we analyzed the size of magnetic cores, their crystal structure and quality. We found that the SC technique provides a homogenous layer of magnetosomes and hydrophilization of silicon surfaces improves the deposition of magnetosomes. However, due to strong hydrogen interaction to the hydrophilic silicone surface, the organic membrane of magnetosomes is mostly flattened. As a matter of fact, the size distributions of magnetosomes deposited by SC and DC techniques (logarithmic-normal tendency) differ from the Feret diameter distribution (normal). Furthermore, our study confirms the good crystalline quality of magnetosomes' cores. It also shows that they are magnetic in the all their volume.

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“…Naively assuming that the magnetosomes are formed in line, the most preferable number of magnetosomes in one chain can be estimated to be 6-7 (based on magnetosome size experiments performed earlier by TEM and XRD methods [9]). Nevertheless, it is known that the magnetosomes tend to minimize their energy forming closed loops [12,19] and can be seen in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%