Imaging passive

Fig. 3.24. Di rect-imaging mode SIMS image of a passivation layer on a niobium alloy [3.54], Boron enrichment at the interface is not visible with EPMA. Measurement time 10 s image diameter 150 pm primary ions OJ primary energy 5.5 keV.

Fig. 17. Confocal fluorescence imaging of [Zn(ATSM)] in IGROV cells (100 pM, where Q1 — Q2 = Me, M = Zn(II), R1 = R3 = H and R2 = R4 = Me, /ex = 488 nm, DMEM with 1% DMSO). Brightfield image shows formation of needle-like crystalline material on the cell plate (N.B. Small crystallites may be endocytosed by the cells rather than passively diffuse through the cell membrane).

Bellec A, Ample F, Riedel D, Dujardin G, Joachim C (2009) Imaging molecular orbitals by scanning tunneling microscopy on a passivated semiconductor. Nano Lett 9 144... 

FIG. 3. Confocal images showing the location of the SR in live myocytes within an intact, small diameter (< 250 nm passive diameter), pressurized (70 mmHg) artery from the rat mesenteric artery arcade. The artery was loaded with Fluo-4 as the membrane-permeant acetoxymethyl ester. Some of this high-affinity, Ca2+ indicator dye is often sequestered in the SR (cf. Goldman et al 1990). The SR can then be readily visualized, especially when [Ca2+]CYx is low (as in the panels at 0 and 6.8 s), because the intra-SR dye is saturated with Ca2+, and fluoresces brightly. This artery was treated with 1.0 fim phenylephrine (PE), which caused the [Ca2+]CYT level to oscillate asynchronously in the cells seen in the centre of the panel. The cell outlines are clearly visible when [Ca2+]CYT tiscs, as in the panels at 3.4 and 10.2 s. Note that nearly all of the SR (the very bright areas, especially in the 0 and 3.4 s panels) lies parallel to, and immediately beneath the PL (from Miriel at al 1999, with permission). 

Using the unique four-electrode STM described above, Bard and coworkers (Lev, 0. Fan, F-R.F. Bard, A.J. J. Electroanal. Chem.. submitted) have obtained the first images of electrode surfaces under potentiostatic control. The current-bias relationships obtained for reduced and anodically passivated nickel surfaces revealed that the exponential current-distance relationship expected for a tunneling-dominated current was not observed at the oxide-covered surfaces. On this basis, the authors concluded that the nickel oxide layer was electrically insulating, and was greater than ca. 10 A in thickness. Because accurate potential control of the substrate surface is difficult in a conventional, two-electrode STM configuration, the ability to decouple the tip-substrate bias from... 

D Braun, J Rowe, and G Yu, Crosstalk and image uniformity in passive matrix polymer LED displays, Synth. Met., 102 920-921, 1999. 

Figure 6. A Sx5-nm topographic image of the fine structure of a step edge along the [-101] direction of the Ni surface passivated at +750mV/SHE, V, = +113 mV, /, = 0.5 nA. The lines indicate a two-stage transition between the upper terrace (right) and the lower terrace (left). (Reprinted from Ref. 41 by permission of The Institute of Materials, London.)...

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