Coupled reaction channels

The binding of PCP to its receptor initiates a series of coupled neurochemical events eventually leading to the expression of behavior. One such coupling reaction was described by BLAUSTEIN as a blockade of transmembrane channels that transport K+ into the neuronal cells. Since K+ movements are part of the process of neurotransmission between neurons, this effect of PCP may explain the results of studies by MARWAH and by JOHNSON, in which several neurotransmitter systems were shown to be involved in the actions... 

The initial coupling ri3,r 1(C1)-octadienediyl-Nin compound is likely to represent the critical species that connects the alternative reaction channels. The concentration of the respective species 2a and 2b and their reactivity when undergoing subsequent butadiene insertion or reductive elimination, which is accompanied by intramolecular C-C bond formation, represent important factors for the regulation of the C8 Ci2 product ratio. 

Injector design determines the physicochemical processes occurring in liquid propellant rocket engines. A complete quantitative description of the processes in liquid rockets is impossible because of our limited understanding of chemical reaction mechanisms and rates. The use of similarity principles simplifies the solution of theoretical combustion problems and is described for channel flow with chemical reactions and for diffusion flames over liquid droplets involving two coupled reaction steps. We find the new result that the observed burning rate of a liquid droplet is substantially independent of the relative rates of the coupled reactions. 

Recently, Miller and co-workers have obtained a generalized form of the distribution of unimolecular decay rates for the case of coupled open channels contributing with unequal partial half-widths [139]. Further results have also recently been obtained in the statistical theory of reactions where the possibility of algebraic decay besides the RRKM exponential decay has been discussed [140]. ... 

Besser et al. [86] studied the reaction in a silicon reactor fabricated by applying MEMS technology, namely photolithography and DRIE by inductively coupled plasma. Each reactor incorporated dual gas inlets, a pre-mixer, a single reaction channel and an outlet zone where the product flow was cooled (see Figure 2.54). The single channel was 500 pm wide, 470 pm deep and 45 mm long. 

Some argue that miniaturized tools for both chemical synthesis and analysis need to be integrated onto a single chip to gain the true benefits of miniaturization [57], not least because of the problems associated with subsystem interconnectivity, dead volumes and chip-to-world interfaces. Demonstrations toward such a goal include, for example, a hyphenated mixing reaction channel coupled to a capillary electrophoresis column [58]. 

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