Switchability

The editor provides two modes for drawing the structure and the draw mode. This distinction is important for differentiating chemical information from conventional drawings. Both modes are switchable and provide an extensive set of features in the menu bar to create chemical structures and reactions, or just drawings. The number of options can be quite confusing for beginners however, one becomes accustomed to them after a short period of vocational adjustment. 

The lubrication system, for reliabihty reasons, usually has an operating and a standby pump and dual switchable filters. If there is a cooling-water scahng problem, coolers may also be switchable. 

If appropriate, eliminate flame arrester or use parallel switchable flame arresters with flow monitoring... 

There are several different types of switchable glazings. All arc activated by a physical phciioinclion (light, heat, or electricity), and, once activated, they switch, either incrementally or completely, to a different state. The state in which they permit the high-... 

The second method of improving the power factor of an installation is to provide static capacitor banks. These can be installed as a single block at the point of supply busbar, as a set of switchable banks or as individual units connected to specific loads. For an installation where no synchronous machines are installed for other purposes (i.e. as prime movers or generators) then static capacitor banks are almost invariably the most cost-effective way of improving the power factor. 

When connected as switchable banks the rating of each step of the capacitor bank must be selected with care. It is important that the control relay settings are matched to the ratings of each capacitance step in order to prevent hunting (i.e. continuously switching in and out at a particular load point). When capacitors are connected to one particular load (usually a motor) the capacitor bank can be located at the motor, adjacent to but separate from the control switchgear or within the control switchgear itself. 

As just mentioned, phosphorus porphyrins have unique photochemical properties. Their photophysics is also interesting. Emitter-quencher assemblies based on porphyrin building blocks have attracted attention due to their potential to serve as models in photosynthetic research (see [90] for an example) or for the development of photoswitches that could be used for the fabrication of molecular electronic/optical devices. In this context, Maiya and coworkers constructed a P(VI) porphyrin system 59b with two switchable azobenzene groups positioned in the apical positions of the pseudo-octahedral phosphorus atom [92]. Photoswitch ability (luminescence on/off) was demonstrated as... 

Recent advances of the Seeman group led to the construction of a nanomechanical device from DNA [89]. In this molecular apparatus, the ion-dependent transition of B-DNA into the Z-conformation is used to alter the distance between two DNA DX domains attached to the switchable double helix. Atomic displacements of about 2-6 nm were attained. Ionic switching of nanoparticles by means of DNA supercoiling has also been reported [53]. Additional advances regarding the use of DNA is nanomechanical devices have been reported by Fritz et al., who showed that an array of cantilevers can be used to... 

These new sulfur bearing complexes can potentially be used as a thermo-switchable latent catalyst. 

K. K. Midha, M. J. Rawson, and J. W. Huhban, Pre-scribability and switchability of highly variable drugs and drug products, J. Controlled Release, 62, 33 (1999). 

Chang KC, Su I, Senthilvelan A, Chung W (2007) Triazole-modified calix[4]crown as a novel fluorescent on—off switchable chemosensor. Org Lett 9 3363-3366... 

Bates, M., Huang, B., Dempsey, G. T. and Zhuang, X. (2007). Multicolor super-resolution imaging with photo-switchable fluorescent probes. Science 317, 1749-53. 

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