The analysis of the dust found mold spores, animal hair, feathers, wood chips and human skin cells.
The institute also looked at the dust found in attics of houses in Dover Township while seeking evidence of historic air pollution.
The Environmental Protection Agency released a study stating that the dust found in these countries contains toxins, bacteria and metals that can lead to health problems.
The federal mine safety agency reiterated on Friday that it had found no evidence of a big methane explosion and that its investigators believed that the heavy coating of coal dust found throughout the mine was typical of conditions before the explosion, and not caused by it.
The trace components identified in Ganymede's icy surface include a smaller amount of the same claylike dust found on Callisto and the same traces of solid carbon dioxide, hydrogen peroxide, and sulfur compounds, plus evidence for molecular oxygen and ozone trapped in the ice.
This result can be caused by coarse mineral and organic airborne dust found in the showcases.
Tests were conducted by the Center for Agricultural Air Quality Engineering and Science (CAAQES) and by Safety Consulting Engineers Inc. (SCE) to determine if dust found in cotton gins (gin dust) would serve as fuel for dust explosions.
Ulysses delivered another unexpected discovery: Instruments aboard the spacecraft designed to study interstellar dust found a surprising amount of neutral helium atoms arriving from deep space--a find from which scientists have deduced that the universe contains too little matter to halt its expansion.
It also has the ratio of compact to fluffy particles close to the one found in situ for comet 1P/Halley and the mass ratio of silicate to carbonaceous materials equal to unity that is in accordance with the elemental abundances of Halley's dust found by Giotto mission.
In the most comprehensive hunt for bacteria and fungi ever done of the ISS, the team sequenced genetic material plucked from dust found in equipment that returned to Earth: an air filter used for 40 months and two used vacuum cleaner bags.
