Bistable jump model

The experimental multifield relaxation data (T T2, n.O.e.) for amylose were nicely reproduced by using these two models.11 However, the wobbling-in-a-cone model is favored for two reasons first, it requires fewer adjustable parameters than the bistable jump model to fit the data second, the jump model requires /32 = 48.9°... 

Fig. 15.—Bistable (two-state) jump model. [Reproduced with permission from Fig. 3 of P. Dais, Carbohydr. Res., 160 (1987) 73-93 and Elsevier Science B.V.]...

Figure 7.10 Total average concentration Ctotai in the stationary state vs Da obtained numerically for the bistable model in the open vortex-sink flow. Note the discontinuous jump to Ctotai = 0 at Da = Dac R 24.2, that is characteristic to the bistable dynamics.

In batch conditions, the model behaves (as does the experimental system) as a clock reaction, with an induction period followed by a sudden jump of several orders of magnitude in H and then an exponential decrease in H. Under flow conditions, bistability and oscillations are obtained. The model can easily be adapted to describe a wide variety of pH oscillators, including iodate-sulfite-thiourea (Rabai et ah, 1987), iodate-sulfite-thiosulfate (Rabai and Beck, 1988), periodate-thiosulfate (Rabai et ah, 1989a), periodate-hydroxylamine (Rabai and Epstein, 1989), and iodate-hydroxylamine (Rabai and Epstein, 1990). 

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