“Figures showed that amounts of the pollutant nitrogen dioxide were predicted to exceed allowed annual limits in five areas of the city.”

“The supply of nitrogen and sulfur from the soil will return to normal once the soil is warm.”

“Appreciable amounts of nitrogen are present in the atmosphere, biosphere, hydrosphere, and geosphere.”

“Strain PCC 6313 is a strict photoautotroph and is able to synthesize nitrogenase anaerobically.”

“The macrophytes of wetlands are known, and in some cases, the nitrogenase activity of these plants has been examined as well.”

“The catalytic conversion is achieved either industrially, using heterogeneous catalysts or biologically, by the nitrogenase enzyme.”

“Carbonitriding is a modified form of gas carburizing, rather than a form of nitriding.”

“However, the full effect of nitriding will not be realized unless alloy steel is selected.”

“The nitriding process is based on the affinity of nascent nitrogen for iron and certain other. metallic elements.”

“Precipitation of aluminum nitride may also play an important role in this type of fracture.”

“Only diamonds and cubic boron nitride are harder than boron suboxide, which appears to have promising potential.”

“The aluminum nitride material has an interconnected intergranular phase that functions as an electrically conductive phase.”

“As a result, the deaminated product, urocanate, is not the usual a-keto acid associated with loss of a-amino nitrogens.”

“These man-made compounds have a ring of six carbons joined to a 7-member ring with 5 carbons and 2 nitrogens indicated by diazo.”

“The free-base form of such porphyrins contains two pyrrole nitrogens.”