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Signal/noise ratio systems

In a quadrupole mass spectrometer (discussed below), the computer enhances system sensitivity by integrating ion current signals at specified mass positions, thus increasing signal-noise ratio. Bonelli (18) used a computer-controlled quadrupole GC-MS to analyze for traces of PCB s in the environment. [Pg.44]

The crystals discussed above contain only about 30% protein and about 70% water, detergent, and crystallization buffer (1), causing the signal/noise ratio of the difference spectra to decrease as compared with simpler protein systems. Reaction centers reconstituted into lipid vesicles contain more protein in comparison to water, buffer, and lipid and should provide a higher signal/noise ratio. Thus the reconstituted system should increase the probability of seeing small changes in the difference spectra. [Pg.72]

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