Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes
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 periodi...
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Publicado: |
2012
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v111_n4_p_Godoy http://hdl.handle.net/20.500.12110/paper_00218979_v111_n4_p_Godoy |
| Aporte de: |
| id |
paper:paper_00218979_v111_n4_p_Godoy |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00218979_v111_n4_p_Godoy2023-06-08T14:42:49Z Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes Jorge, Guillermo Antonio Ferrari, Hernán Javier Antonel, Paula Soledad Ruiz, Mariano Manuel Negri, Ricardo Martin Pettinari, María Julia Bekeris, Victoria Isabel 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) 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. Fil:Jorge, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ferrari, H.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Antonel, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ruiz, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Negri, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pettinari, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v111_n4_p_Godoy http://hdl.handle.net/20.500.12110/paper_00218979_v111_n4_p_Godoy |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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) |
| spellingShingle |
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) Jorge, Guillermo Antonio Ferrari, Hernán Javier Antonel, Paula Soledad Ruiz, Mariano Manuel Negri, Ricardo Martin Pettinari, María Julia Bekeris, Victoria Isabel Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| topic_facet |
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) |
| description |
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. |
| author |
Jorge, Guillermo Antonio Ferrari, Hernán Javier Antonel, Paula Soledad Ruiz, Mariano Manuel Negri, Ricardo Martin Pettinari, María Julia Bekeris, Victoria Isabel |
| author_facet |
Jorge, Guillermo Antonio Ferrari, Hernán Javier Antonel, Paula Soledad Ruiz, Mariano Manuel Negri, Ricardo Martin Pettinari, María Julia Bekeris, Victoria Isabel |
| author_sort |
Jorge, Guillermo Antonio |
| title |
Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| title_short |
Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| title_full |
Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| title_fullStr |
Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| title_full_unstemmed |
Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| title_sort |
micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v111_n4_p_Godoy http://hdl.handle.net/20.500.12110/paper_00218979_v111_n4_p_Godoy |
| work_keys_str_mv |
AT jorgeguillermoantonio micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT ferrarihernanjavier micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT antonelpaulasoledad micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT ruizmarianomanuel micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT negriricardomartin micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT pettinarimariajulia micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes AT bekerisvictoriaisabel micrometricperiodicassemblyofmagnetotacticbacteriaandmagneticnanoparticlesusingaudiotapes |
| _version_ |
1768543831110713344 |