The interdisciplinary project team is made up of eco - and human toxicologists, physicists, chemists and biologists, and they have just managed to take their first major step forward in achieving their goal: they have developed a method for testing a variety of environmental samples such as river water, animal tissue, or human urine and blood that can detect nanomaterials at a concentration level of nanogram per liter (ppb — parts per billion). (sciencedaily.com)
In laboratory tests, just a few tens of nanograms of these compounds per litre can skew sex ratios and decrease fertility in fish. (scientificamerican.com)
Progesterone was measured in nanograms per milliliter of plasma (ng / ml). (sciencenews.org)