Transmittance multiplication factor

Figure 53-35 Transmittance multiplication factor as a function of the lower cutoff limit of the Normal distribution, for varying values of the center of the distribution.

When the noise is small the multiplication factor approaches unity, as we would expect. As we have seen for the previous two types of noise we considered, the nonlinearity in the computation of transmittance causes the expected value of the computed transmittance to increase as the energy approaches zero, and then decrease again. For the type of noise we are currently considering, however, the situation is complicated by the truncation of the distribution, as we have discussed, so that when only the tail of the distribution is available (i.e., when the distribution is cut off at +3 standard deviations), the character changes from that seen when most of the distribution is used. 

Other factors have been described which influence the transmitter phenotype of the sympathetic neurons. Most of the sympathetic neurons are adrenergic, except for those which innervate the sweat glands, which are cholinergic. One of the factors which may influence the switching of phenotype of these neurons to cholinergic has recently been purified and is equivalent to LIF (Yamamori et al., 1989). As discussed below, it is beginning to emerge that LIF has multiple activities within the nervous system as well as outside it. 

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