To the human palate this compound is detectable in wines with pyrazine levels as low as 2 nanograms (ng) per liter.
Very small amounts of this compound, on the order of nanograms, can be responsible for this defect.
Treatment is initiated when ferritin levels reach 300 nanograms per millilitre (or 200 in nonpregnant premenopausal women).
Serum ferritin in excess of 1000 nanograms per millilitre of blood is almost always attributable to haemochromatosis.
Fermium-257 is the heaviest isotope that is obtained via neutron capture, and can only be produced in nanogram quantities.
The average concentration was approximately 63 nanograms per liter.
Most concern is caused by dioxins; the current standard is no more than 1 nanogram per cubic metre, which means no more than 1 part in 1 billion.
This could seriously endanger the health of small children, as even a thousandth of a nanogram can cause symptoms, such as influenza, in adults if it enters the bloodstream.
