Positional encoding

Fig. 1. A device for luminescence multiplexed assays based on position encoding ...

There are two steps in protein synthesis where polarity of information is important. The first is the relationship between the 50 to 30 directionality of mRNA, and the NH3+ to COO- terminal direction of protein synthesis. The utilization of tRNA as the adaptor is the second step where polarity of information is crucial. The tRNA has a bipolar function, it needs to correctly link each amino acid to the corresponding position encoded by the mRNA. Figure 26.1 shows an overview of how mRNA synthesis and protein translation share the same polarity. Moreover, similar to transcription, translation can also be broken down into three discrete components initiation, elongation, and termination. 

Convert the LC effluent to solids on a position-encoded rotating disc. 

Another type of interface is the system commercially available from Laboratory Connections, which is similar to that above. The sample is deposited as it elntes (sprayed from a nebuliser) onto a position-encoded, slowly rotating germaninm disc. The disc is transferred to a reflectance sampling stage where it is rotated at the same rate as before in order to reconstruct the chromatogram, all the while collecting spectra. Potassinm bromide discs cannot be used in reversed phase HPLC so zinc-seleninm or calcinm fluoride can be employed instead. 

FIGURE 18.2 Gross displacement transducers (a) potentiometers, (b) variable differential transformers (VDT), (c) synchros (typical connection), (d) resolvers (typical connection), (e) absolute position encoders, (f) code track for incremental position encoder. 

The state-of-the-art connector press is electromechanically actuated, relying on a motor-driven coarse-pitch lead screw with tachometer speed control, z-axis positional encoders, and load cell feedback for an accurate pressing cycle (see Fig. 49.9). 

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