1.   Filtration At the present time there is considerable concern about concentrations of nitrogen compounds in water containing goldfish.

2.   The soil was tested to make sure that it was free from ammonia or any other nitrogen compound.

3.   In the presence of sunlight, the nitrogen compounds produce ozone.

4.   Molecular differences between nitrogen compounds help scientists design sniffers that can even recognize one explosive from another.

5.   Nitrates, a nitrogen compound found in animal waste and fertilizer, has been correlated to gastric cancer, according to some studies.

6.   Since World War II, the technology of explosives has become more and more sophisticated, but nitrogen compounds are the crucial ingredients of virtually every device.

7.   Sulfur dioxide is the primary cause of acid rain, and the nitrogen compounds are precursors of urban smog.

8.   The nitrates, a nitrogen compound found in animal waste and fertilizer, possibly came from experiments on raw sewage conducted at the site, Deaver speculated.

9.   The nitrogen compounds that terrorists mix into their biggest bombs are extremely crude.

10.   Nitrogen compounds that leach into waterways and aquifers are linked to environmental damage and serious illnesses.