Results 211 to 220 of about 26,243 (260)

Magnetite Biomineralization in Bacteria

2011
Magnetotactic bacteria are able to biomineralize magnetic crystals in intracellular organelles, so-called "magnetosomes." These particles exhibit species- and strain-specific size and morphology. They are of great interest for biomimetic nanotechnological and biotechnological research due to their fine-tuned magnetic properties and because they ...
Baumgartner, J., Faivre, D.
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Magnetite Pneumoconiosis

Journal of Occupational and Environmental Medicine, 1978
A subject is described who was exposed to fine particles of magnetite (Fe3O4). His chest radiograph demonstrated the presence of multiple small rounded opacities; however, his lung function remained unaffected.
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Extracellular Synthesis of Magnetite and Metal-Substituted Magnetite Nanoparticles

Journal of Nanoscience and Nanotechnology, 2006
We have developed a novel microbial process that exploits the ability of Fe(III)-reducing microorganisms to produce copious amounts of extracellular magentites and metal-substituted magnetite nanoparticles. The Fe(III)-reducing bacteria (Theroanaerobacter ethanolicus and Shewanella sp.) have the ability to reduce Fe(III) and various metals in aqueous ...
Y, Roh, H, Vali, T J, Phelps, J W, Moon
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Nitrite Reactivity with Magnetite

Environmental Science & Technology, 2013
Under Fe(3+)-reducing conditions, soil Fe(2+) oxidation has been shown to be coupled with nitrate (NO3(-)) reduction. One possible secondary reaction is the involvement of NO3(-) and nitrite (NO2(-)) with magnetite, a mixed valence Fe(2+)/Fe(3+) mineral found in many natural environments.
P, Dhakal, C J, Matocha, F E, Huggins, M M, Vandiviere   +3 more
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Magnetite-based magnetoreception

Current Opinion in Neurobiology, 2001
Orientation, navigation, and homing are critical traits expressed by organisms ranging from bacteria through higher vertebrates. Sensory systems that aid such behavior have provided key selective advantages to these groups over the past 4 billion years, and are highly evolved; magnetoreception is no exception.
Kirschvink, Joseph L., Walker, Michael M., Diebel, Carol E.   +2 more
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Magnetostriction and Permeability of Magnetite and Cobalt-Substituted Magnetite

Physical Review, 1955
The principal magnetostriction constants of magnetite were determined over the temperature range from 120\ifmmode^\circ\else\textdegree\fi{}K to 300\ifmmode^\circ\else\textdegree\fi{}K by the strain gauge technique. Since ${\ensuremath{\lambda}}_{111}$ and ${\ensuremath{\lambda}}_{100}$ are different in sign and practically constant over this entire ...
L. R. Bickford, J. Pappis, J. L. Stull
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Preparation and Properties of Magnetite and Polymer Magnetite Nanoparticles

Langmuir, 1999
A novel approach to prepare magnetic polymeric nanoparticles by synthesis of the magnetite core and polymeric shell in a single inverse microemulsion is reported. Stable magnetic nanoparticles colloid dispersion with narrow size distribution can thus be produced.
Pierre A. Dresco, Vladimir S. Zaitsev, Richard J. Gambino, Benjamin Chu   +3 more
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Magnetocrystalline anisotropy of magnetite

Journal of Physics: Condensed Matter, 2012
The spin reorientation temperature T(SR) of stoichiometric Fe(3)O(4), as well as of magnetite with a small number of vacancies and magnetite containing a low concentration of Ti, Zn, Al and Ga was measured on single-crystal samples using the ac susceptibility. In the same experiment the temperature T(V) of the Verwey transition was also found.
R, Řezníček, V, Chlan, H, Štěpánková, P, Novák, M, Maryško   +4 more
openaire   +2 more sources

Application of magnetite and silica–magnetite composites to the isolation of genomic DNA

Journal of Chromatography A, 2000
Magnetite and silica-magnetite composites were used as adsorbents for the isolation of genomic DNA from maize kernels. Two methods are described for the preparation of silica-magnetite composites, both of which afford higher yields of genomic DNA than when using magnetite alone, or a commerically available kit.
J I, Taylor, C D, Hurst, M J, Davies, N, Sachsinger, I J, Bruce   +4 more
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Electronic processes in magnetite (or, "Enigmas of magnetite")

Physics-Uspekhi, 1993
The properties of magnetite in the region of the low-temperature transformation Tt = 100 – 120 K are in many respects still unclear and even enigmatic, in spite of the enormous number of studies that have been undertaken over the years. In this review article a new model for the low-temperature transformation in magnetite is presented, based on an ...
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