News tagged with soil

Related topics: plants , climate change , nitrogen , atmosphere , carbon

How Legionella subverts to survive

(Medical Xpress)—Bacteria of the genus Legionella have evolved a sophisticated system to replicate in the phagocytic cells of their hosts. LMU researchers have now identified a novel component of this system.

Jul 18, 2013
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New rice contamination reported in China

Authorities are investigating rice mills in southern China following tests that found almost half of the staple grain in one of the country's largest cities was contaminated with a toxic metal.

May 21, 2013
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Cancer and birth defects in Iraq: The nuclear legacy

Ten years after the Iraq war of 2003 a team of scientists based in Mosul, northern Iraq, have detected high levels of uranium contamination in soil samples at three sites in the province of Nineveh which, coupled with dramatically ...

May 21, 2013
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How some cancers 'poison the soil' to block metastasis

Cancer spread or metastasis can strike unprecedented fear in the minds of cancer patients. The "seed and the soil" hypothesis proposed by Stephen Paget in 1889 is now widely accepted to explain how cancer cells (seeds) are ...

Apr 30, 2013
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Soil

Soil is a natural body consisting of layers (soil horizons) of mineral constituents of variable thicknesses, which differ from the parent materials in their morphological, physical, chemical, and mineralogical characteristics. It is composed of particles of broken rock that have been altered by chemical and environmental processes that include weathering and erosion. Soil differs from its parent rock due to interactions between the lithosphere, hydrosphere, atmosphere, and the biosphere. It is a mixture of mineral and organic constituents that are in solid, gaseous and aqueous states. Soil particles pack loosely, forming a soil structure filled with pore spaces. These pores contain sol solution (liquid) and air (gas). Accordingly, soils are often treated as a three state system. Most soils have a density between 1 and 2 g/cm³. Soil is also known as earth: it is the substance from which our planet takes its name. Little of the soil composition of planet Earth is older than Tertiary and most no older than Pleistocene. In engineering, soil is referred to as regolith, or loose rock material.

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