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Abstract:

We report micrometric periodic assembly of live and dead magnetotactic bacteria, Magnetospirillum magneticum AMB-1, which synthesize chains of magnetic nanoparticles inside their bodies, and of superparamagnetic Fe 3 O 4 and ferromagnetic CoFe 2 O 4 nanoparticles in aqueous suspensions using periodically magnetized audio tapes. The distribution of the stray magnetic field at the surface of the tapes was determined analytically and experimentally by magneto-optic imaging. Calculations showed that the magnetic field close to the tape surface was of the order of 100 mT, and the magnetic field gradient was larger than 1 T mm -1 . Drops of aqueous solutions were deposited on the tapes, and bacteria and particles were trapped at locations where magnetic energy is minimized, as observed using conventional optical microscopy. Suspensions of M. magneticum AMB-1 treated with formaldehyde and kanamycin were studied, and patterns of trapped dead bacteria indicated that magnetic forces dominate over self-propelling forces in these experiments, in accordance with calculated values. The behavior of the different types of samples is discussed. © 2012 American Institute of Physics.

Registro:

Documento: Artículo
Título:Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes
Autor:Godoy, M.; Moreno, A.J.; Jorge, G.A.; Ferrari, H.J.; Antonel, P.S.; Mietta, J.L.; Ruiz, M.; Negri, R.M.; Pettinari, M.J.; Bekeris, V.
Filiación:Laboratorio de Genética y Ecología Microbianas, Departamento de Química Biológica, FCEyN, Buenos Aires, Argentina
Laboratorio de Bajas Temperaturas, Departamento de Física, CONICET, Buenos Aires, Argentina
Research Members of National Council of Research and Technology, CONICET, Argentina
Laboratorio de Arreglos Multisensoriales, Departamento de Qumica Inorgnica, Analtica y Qumica Física, CONICET, Buenos Aires, Argentina
Palabras clave:Aqueous suspensions; Calculated values; Kanamycins; Magnetic energies; Magnetic field gradient; Magnetic force; Magnetic nanoparticles; Magneto-optic imaging; Magnetotactic Bacteria; Stray magnetic fields; Superparamagnetics; Tape surfaces; Bacteria; Magnetic amplifiers; Magnetic fields; Nanoparticles; Optical microscopy; Superparamagnetism; Suspensions (fluids); Synthesis (chemical); Suspensions (components)
Año:2012
Volumen:111
Número:4
DOI: http://dx.doi.org/10.1063/1.3681380
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00218979_v111_n4_p_Godoy.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v111_n4_p_Godoy

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Citas:

---------- APA ----------
Godoy, M., Moreno, A.J., Jorge, G.A., Ferrari, H.J., Antonel, P.S., Mietta, J.L., Ruiz, M.,..., Bekeris, V. (2012) . Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes. Journal of Applied Physics, 111(4).
http://dx.doi.org/10.1063/1.3681380
---------- CHICAGO ----------
Godoy, M., Moreno, A.J., Jorge, G.A., Ferrari, H.J., Antonel, P.S., Mietta, J.L., et al. "Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes" . Journal of Applied Physics 111, no. 4 (2012).
http://dx.doi.org/10.1063/1.3681380
---------- MLA ----------
Godoy, M., Moreno, A.J., Jorge, G.A., Ferrari, H.J., Antonel, P.S., Mietta, J.L., et al. "Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes" . Journal of Applied Physics, vol. 111, no. 4, 2012.
http://dx.doi.org/10.1063/1.3681380
---------- VANCOUVER ----------
Godoy, M., Moreno, A.J., Jorge, G.A., Ferrari, H.J., Antonel, P.S., Mietta, J.L., et al. Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes. J Appl Phys. 2012;111(4).
http://dx.doi.org/10.1063/1.3681380