51.   They also measured ozone levels.

52.   This measures the level of acidity or alkalinity in the water.

53.   They then used a technique called magnetic resonance spectroscopy to measure levels of NAA and choline in a brain region involved in a wide variety of cognitive functions.

54.   They were given vitamin supplements and standard prenatal counseling, and the scientists measured blood levels of folic acid to check vitamin consumption.

55.   This would enable them to measure radiation levels so that government agencies could assess the risk and respond accordingly, Meinhold said.

56.   This instrument measures oxygen levels in the blood.

57.   Unlike most blood tests, which measure levels of single substances, the new test looks for patterns of proteins that set cancer patients apart.

58.   Two recent independent French studies suggest that some adjustment to current models will be necessary, however the decibel level is measured.

59.   Using the device to measure levels of carbon-dioxide in the lungs of patients getting emergency CPR, researchers successfully predicted when patients would not recover.

60.   Workers on the scene can also measure oxygen levels faster than in years past.