STM

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STM

(1) (Synchronous Transport Module) The European designation of SONET channel speeds. See STS and SONET.

(2) (Scanning Tunneling Microscope) A microscope that can image down to the atomic level. An STM uses a piezoelectric tube with a tiny sharp tip at the end that is moved within nanometers of the object being sampled. As it gets close, the voltage applied to the tip causes a "tunneling" current to flow to the object. As the tip is moved and bumps into an obstruction, the current changes. In order to maintain a certain constant current, the tip is raised and lowered accordingly, and this movement pattern is magnified and displayed on screen. See AFM, microscopy and nanotechnology.
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References in periodicals archive ?
The expression of human SULT1A1*1, SULT1A3, SULT1B1, and SULT1E1 in Escherichia coli has been described previously (Dajani et al.
The 100,000g supernatant fractions of SULT1A1*1, SULT1A3, SULT1B1, and SULT1E1 were partially purified by chromatographic methods (Falany et al.
For SULT1A1*1 and -1A1*2, we used seven substrate concentrations in the range from 5 to 100 nM; for SULT1E1 we used six 3-OH-BaP concentrations from 15.6 to 1,000 nM; and for SULT1A3 and 1BI we used seven concentrations of 3-OH-BaP from 0.25 to 5.0 [micro]M.
coli expressing SULT1A1*1, SULT1A3, SULT1B1, and SULT1E1, and the purchased Sf-9 cytosol fraction (PanVera, Madison, WI) containing SULT1A1*2.