290. microsample Sample of blood or any other biological matrix in the low µl/µg range utilized for certain preclinical or clinical studies.
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291. microsampling The process of collecting and analyzing minute samples, no more than 10–20 μl. This term normally refers to blood samples.
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292. miniature MS The size of the mass spectrometer is reduced, allowing for use outside of the traditional laboratory setting.
293. mixed mode The use of multiple retentive modes to effect a separation, pertaining to a chromatographic or solid-phase extraction process. For example, ion-exchange can be performed in conjunction with reversed-phase partitioning.