Nitrogen also occurs in mineral deposits of nitre or saltpetre (potassium nitrate, KNO3) and Chile saltpetre (sodium nitrate, NaNO3), but these deposits exist in quantities that are wholly inadequate for human needs.
Recording such large speech corpora is time-consuming and expensive; as a result, there do not exist sufficient quantities of data for disabled users.
Utilization indices exist to measure quantity of prenatal care, but currently there is no published instrument to assess quality of prenatal care.
Media dynasties still exist in quantity, but their long-term prospects are cloudy, and many of their firms already are seen as prime acquisition bait.
Gold standard studies do not exist and quantity of evidence is sometimes limited to case reports and not controlled studies.
No statistically significant differences existed in quantities between WT and the bba64 mutant at all time points, except 48 h and 72 h; when there were significantly more bba64 mutant spirochetes than in WT-infected nymphs (P≤0.001) (Figure 2).
However, this does not rule out the possibility of as yet unknown longer-lived isotopes or nuclear isomers existing, some of which could, if long-lived enough, still exist in trace quantities today.
Huge quantities exist around the world.
Gypsum, sulfur, fluorite, arsenic, alum, and asbestos also exist in large quantities.
First came neptunium, in 1940, with ninety-three prothen, then plutonium, with ninety-four (whith, iturnsns out, does exist in trace quantities in nature).
