Parts per billion

Known as: parts per billion (ppb), ppb, [ppb] 
A unit of proportion equal to 10E-9.
National Institutes of Health

Topic mentions per year

Topic mentions per year

1938-2017
05019382016

Papers overview

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2017
2017
Precise comparisons of the fundamental properties of matter–antimatter conjugates provide sensitive tests of charge–parity–time… (More)
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2013
2013
Photoactivation of titanium dioxide nanoparticles (TiO2NPs) can produce reactive oxygen species (ROS). Over time, this has the… (More)
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2009
2009
RATIONALE Identification of the minimal ozone (O(3)) concentration and/or dose that induces measurable lung function decrements… (More)
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Highly Cited
2005
Highly Cited
2005
Perfluorochemicals are widely used in the manufacturing and processing of a vast array of consumer goods, including electrical… (More)
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Highly Cited
2002
Highly Cited
2002
Atrazine is the most commonly used herbicide in the U.S. and probably the world. It can be present at several parts per million… (More)
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Highly Cited
1999
Highly Cited
1999
Long-term ambient concentrations of inhalable particles less than 10 microm in diameter (PM10) (1973- 1992) and other air… (More)
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Highly Cited
1996
Highly Cited
1996
Exhaled nitric oxide (NO) is elevated in untreated patients with asthma but not in patients treated with inhaled glucocorticoids… (More)
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Highly Cited
1994
Highly Cited
1994
High values (800-6000 parts per billion) of nitric oxide (NO) in expelled air from the stomach were shown in humans by… (More)
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1994
1994
10 Sccm A system including a commerical instrument (Thermo Electron Corp., Model 48) operating on the principle of gas filter… (More)
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Highly Cited
1993
Highly Cited
1993
The presence of nitric oxide (NO) in the exhaled air of humans has recently been described. We wanted to assess at what level… (More)
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