Electronic sensing system

Atienza JM. 2006. Dynamic and label-free cell-based assays using the real time cell electronic sensing system. Assay Drug Dev. Technol. 5, 597-607. 

At the microscale, the sensitivity is mainly determined by the volume ratio of the detected particles and the sensing channel and the noise reduction from the fluidic network and the electronic sensing system. Theoretically, sensitivity can be improved either by decreasing the volume of the sensing channel or by using accurate instruments. 

Microsystems are also expected to be introduced in the near future, including for example artificial noses, fingerprint sensing systems, bar code readers, rf-tag-ging systems, microfluidic pumps and dosing systems, gas flow control systems, new flexible and low cost displays or electronic paper. 

Discharge tubes have an excellent detectivity and are solar-blind. These technological advantages have to be balanced against the need for acceleration voltage of some 100 V and complicated readout electronics. These requirements make sensing systems based on discharge tubes much more expensive than those based on photo-... 

Designing a conjugated polymer sensor based on FQ, however, is not only a matter of making a fluorescent polymer for which the photoinduced electron transfer reaction is energetically favorable. There are other important factors that must be considered and requirements that must be met to rehably detect any analyte of interest, including TNT, from the vapor phase. In the broadest sense, these considerations distill to the two primary considerations for any sensing system, sensitivity and selectivity. 

Recapitulating, the SBM theory is based on two fundamental assumptions. The first one is that the electron relaxation (which is a motion in the electron spin space) is uncorrelated with molecular reorientation (which is a spatial motion infiuencing the dipole coupling). The second assumption is that the electron spin system is dominated hy the electronic Zeeman interaction. Other interactions lead to relaxation, which can be described in terms of the longitudinal and transverse relaxation times Tie and T g. This point will be elaborated on later. In this sense, one can call the modified Solomon Bloembergen equations a Zeeman-limit theory. The validity of both the above assumptions is questionable in many cases of practical importance. 

Artificial Sugar-sensing Systems utilizing Photoinduced Electron Transfer (PET) I 291... 

The creation of many effective combinations of artificial nose sensors with only a few functional monomers used in different relative amounts was proven here. The application of combinatorial technologies to the discovery of novel materials for more recent, miniamrized electronic nose systems based on small pol5mier beads (120), and to equally intriguing electronic tonguelike microsensors in solution to mimick the sense of taste for solution mixtures (121), should be highly beneficial and thus is to be expected in the near future. 

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