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part per million (ppm)

Known as: ppms, Part per Million, Per Million 
A unit of proportion equal to 10E-6.
National Institutes of Health

Papers overview

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Highly Cited
2013
Highly Cited
2013
Fluorescent carbon-based materials have drawn increasing attention in recent years owing to exceptional advantages such as high… 
Review
2007
Review
2007
Atmospheric carbon dioxide concentration is expected to exceed 500 parts per million and global temperatures to rise by at least… 
Review
2004
Review
2004
Free-air CO(2) enrichment (FACE) experiments allow study of the effects of elevated [CO(2)] on plants and ecosystems grown under… 
Highly Cited
2000
Highly Cited
2000
Gene duplication has generally been viewed as a necessary source of material for the origin of evolutionary novelties, but it is… 
Highly Cited
1996
Highly Cited
1996
Copper is an essential trace element in living systems, present in the parts per million concentration range. It is a key… 
Highly Cited
1979
Highly Cited
1979
Mitochondrial DNA was purified from four species of higher primates (Guinea baboon, rhesus macaque, guenon, and human) and…