Energy-filtering technique

In addition to fluorescence, radioisotope tracing and physical methods (e.g., microscopy) are also effective techniques for the imaging of carbon nanotubes in vitro and in vivo.100 103 For example, Porter et al. directly visualized individual SWNTs in cells through a new technique called low-loss energy-filtered transmission... 

There are other examples of HIV protease substrates that utilize the fluorescence energy transfer technique. Perhaps the strongest characteristic of these assays is that they provide a continuous readout of enzyme activity. Another advantage is their sensitivity (they use small concentrations of enzyme). The disadvantage of these assays is that they are susceptible to interference by some compounds (inhibition artifacts) because of inner and outer filter effects (see Notes 8-10). Other assays, for example, those based on radioactivity or high-performance liquid chromatography (HPLC) analysis of products are tedious to run, but are less susceptible to interference or inhibition artifacts. 

Although there are other recent hof topics for HRTEM, e g., energy-filtered (EF) TEMs and Z-contrast imaging for scanning TEMs, few investigations with respect to silicates using these new techniques have been reported to date. 

Riciputi LR (1996) A comparison of extreme energy filtering and high mass resolution techniques for the measurement of " S/ S ratios by ion microprobe. Rapid CommunMass Spec 10 282-286 Rona PA, Scott SD (1993) A special issue on sea-floor hydrothemal mineralization new perspectives. EconGeol 88 1935-1976... 

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