| Image analysis of bioparticles accumulation and diamagnetic alignment in high-gradient magnetic field. | |
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MedLine Citation:
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PMID: 16292954 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Magnetic properties of biological particles are measured in high-gradient magnetic separation (HGMS) analysis, revealing the concentrating process of nucleoprotein particles, ferritin, red blood cells, and eggs. A magnetic force acting on micrometer and submicrometer biological particles having diamagnetic or paramagnetic susceptibility with respect to the solution causes their movement and accumulation in gradient magnetic fields dependent on the values of the magnetic moments. The methods developed enable us to obtain the magnetic moments values of single particles and their assembly directly from magnetic separation and image analyses without assuming the detection of sizes. Our precision methods for the measurement of the capture traveling (magnetic diffusion) time and the accumulation (magnetic sedimentation) radius in HGMS show that it is really possible to determine the weak dia- or paramagnetic shifts of magnetic susceptibility up to 0.7x10(-10) (SI units). HGMS analysis of the concentrating process of nucleoprotein granules (microcells, DNA granules, or nucleosome core particles) with polarization microscopy reveals phase transitions for DNA in granules, and separation accumulation of particles enables the determination of the diamagnetic susceptibility and anisotropy properties. Magnetic concentration effects always occur in living systems because micrometer-located gradient magnetic fields inside an organism are strong enough to cause drifts of cellular complexes and organelles of micrometer and submicrometer sizes. We report the appearance of superparamagnetic contamination inside developing shrimp eggs. In the developing shrimps eggs, ferritin aggregates are observed under weak gradient magnetic fields and diaparaferromagnetic changes are detected. A significant interruption of egg development is revealed in such fields. |
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Authors:
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Svetlana B Norina; Sang-Hyun Park; Jungdae Kim; Sungil Cho; A N Shalygin; Kwang-Sup Soh |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Review |
Journal Detail:
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Title: Journal of biomedical optics Volume: 10 ISSN: 1083-3668 ISO Abbreviation: J Biomed Opt Publication Date: 2005 Sep-Oct |
Date Detail:
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Created Date: 2005-11-18 Completed Date: 2006-04-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9605853 Medline TA: J Biomed Opt Country: United States |
Other Details:
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Languages: eng Pagination: 051702 Citation Subset: IM |
Affiliation:
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Seoul National University, School of Physics, Biomedical Physics Laboratory, Seoul, Korea 151747. norina@magn.ru |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Anisotropy Cells, Cultured DNA / ultrastructure* Erythrocytes / ultrastructure* Humans Immunomagnetic Separation / methods* Magnetics / diagnostic use* Microscopy, Polarization / methods* Particle Size |
| Chemical | |
Reg. No./Substance:
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9007-49-2/DNA |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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