spherules


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spherules

(sfe -rool) Small round particles of rock and wüstite (iron oxide) formed by the solidification of molten meteoritic material that flows off a meteorite during its passage through the Earth's atmosphere. Magnetic spherules can easily be recognized in deep sea sediments. Sizes range typically from 10 μm to 200 μm.
References in periodicals archive ?
Many spheroid rocks on Mars are concretions that have eroded out of softer matrix rock, such as copious iron-containing spherules examined by the Opportunity rover,"  Guy Webster, from the media relations office at NASA's Jet Propulsion Laboratory, told International Business Times.
The spherules are seen as spherical elements with thick walls, 5-60 [micro]m, with numerous, small, globular endospores of 2-5 [micro]m in their interior (4).
Isolation and partial characterization of uric acid spherules obtained from cockroach tissues (Dictyoptera).
The spherules in question were recovered from Younger Dryas boundary layers at sites in Pennsylvania and New Jersey, the layers having been deposited at the beginning of the period.
Spherules and endospores disseminate via the lymphatics and bloodstream, leaving essentially all organ systems vulnerable to disease involvement.
The spherules form layers that linger after craters have been erased by tectonic activity.
With crystallization temperatures in the range of 175 ~ 183[degrees]C, the morphology changed to mixed type birefringent spherules coexisting with boundary crystals for pCBT/PCL blend.
The Curie curves of the magnetic extraction showed the presence of some Fe particles, with low Ni-content, interpreted by the author as low-Ni iron spherules originated from the vaporized K-T impactor.
In Kaali area (Island of Saaremaa, Estonia) both magnetite-silicate and silicate spherules were identified [2].
The jaws contain a temperature-sensitive matrix with embedded conductive carbon spherules designed to "sense" tissue characteristics.
Yolk spherules and central cytoplasam and diromic mentrane (Fig.