Trigger fingerprint

In a captivating review, the author surveys the optical properties of non-metallic compounds under pressure. The relationship between the optical properties of compounds and their microscopic structure has always triggered a lot of interest and has been regarded as a fundamental problem. Rare earth ions with partially filled 4f shells provide a detailed fingerprint of the surrounding arrangement of atoms and their interaction... 

Leeches respond to chemical cues from potential hosts. Even a human fingerprint on the inner wall of a glass container triggers searching movements in a leech. 

The data in this case represent a real world deployment situation that had very noisy water quality. In this scenario there were 26 unique trigger events in the first 11 days of operations. All were fingerprinted and learned by the system. 11 of the events were repeated. This demonstrates that common events are rapidly learned by the system resulting in a rapid decrease in unknown alarms. 

The next statement defines a t r igger function that will be used whenever data is inserted or updated in this table. This function performs three important functions. First, it modifies the SMILES to be inserted into the smi column so that it contains the result of the isosmiles function. The isosmiles function is similar to the cansmiles function, except that it retains any stereochemistry that might be contained within the SMILES. If two stereoisomers are entered into this table, each will have a unique isosmiles value, but the same cansmiles value. In this way, they can be kept distinct, but their identical canonical SMILES shows them to be stereoisomers. The trigger function also computes the fingerprint and inserts it into the table when the SMILES is inserted or updated. 

There is some overhead in the use of indexes, constraints, triggers, etc. as discussed here. The overhead is incurred when rows are inserted or updated in the table. However, the value of this approach is that the data in the table are well validated and can be searched more reliably and efficiently. Direct lookups of canonical or stereo SMILES is simple and quick because of the index on these columns. Using the fingerprint column speeds up substructure search. Tautomers can be readily selected using the column of simple graphs. 

As to know, bacteria respond to environmental triggers by switching to different physiological states. If such changes can be detected in the odor fingerprints, then E-nose analysis can produce information that can be very useful in determining virulence. 

In combination with infrared lasers, in particular tunable quantum cascade lasers (QCLs), very fast redox switching combined with IR monitoring appears possible. This opens the possibility to use direct electrochemistry for the triggering of fast chemical and biochemical reactions, and the fingerprint selectivity of infrared spectroscopy for the analysis of the reaction details. 

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