Increase in transmittance

These cascades of reactions need time in the range of seconds synaptic transmission through GPCRs is slow. All further postsynaptic changes depend on the type of postsynaptic cell. For example activation of 32-adrenoceptors causes in the heart an increase of the rate and force of contraction in skeletal muscle glycogenolysis and tremor in smooth muscle relaxation in bronchial glands secretion and in sympathetic nerve terminals an increase in transmitter release. 

By maintaining low concentrations of cytoplasmic noradrenaline, MAO will also regulate the vesicular (releasable) pool of transmitter. When this enzyme is inhibited, the amount of noradrenaline held in the vesicles is greatly increased and there is an increase in transmitter release. It is this action which is thought to underlie the therapeutic effects of an important group of antidepressant drugs, the MAO inhibitors (MAOIs) which are discussed in Chapter 20. 

Downregulation of G protein-mediated presynaptic inhibition Increase in transmitter release Vascular smooth muscle Tang et al. 2003... 

The UV transmittance of the D4-CEL layer increases with exposure time as shown in Fig.2. This increase in transmittance is caused by the decomposition of diazoniun salt. The photochemical reaction of diazoniun salts has been thoroughly investigated(6). The main reaction of diazoniun salts in the solid phase can be described by the following fromula ... 

The first generation of a-adrenoceptor blockers were nonselective, blocking both Oj- and o -receptors. When subjects taking such a drug rise from supine to erect posture or take exercise, the sjmipathetic system is physiologically activated (via baroreceptors). The normal vasoconstrictive (a,) effect (to maintain blood pressure) is blocked by the drug and the failure of this response causes the sympathetic system to be further activated and to release more and more transmitter. This increase in transmitter would normally be reduced by negative feedback via the a -autoreceptors but these are blocked too. 

Photo effects. Fluorescence resulting from frequencies of ultraviolet radiation in a certain range may cause an apparent increase in transmittance with... 

In Aplysia neurons, the synaptic transmission between a sensory neuron and a motor neuron involved in the gill withdrawal reflex is potentiated by a facilitatory neuron, releasing 5-HT from this neuron enhances c-AMP production in the sensory neuron, and is followed by a cascade of events activation of PKA -blockade of K channels - opening of Ca channels - increase in transmitter release. 

However, further optical and electrochemical characterization [24,25] indicate that the electrochromic process in LiyNiOx is still more complicated than the simple uptake of lithium ions in the host structure. In fact, during the first injected charge of 100 millicoulombs per square centimetre and per micron of film thickness (Q< lOOmC pm" ), an increase in transmittance (i.e. bleaching of the film) has been noticed [23]. However, if the amount of charge (and, thus of lithium injected) is increased above this limit, the LiyNiOx electrode shows a reverse behaviour, becoming progressively darker (upper part of Figure 8.7) with a coloration distribution which is not uniform but rather scattered in the form of isolated dark spots [24]. 

The two microwave transitions correspond to an increase in transmittance at the maximum of the Qy band, i.e. the concentration of the triplet state increases when resonant microwaves are applied. Thus the slow-decaying z-sublevel is less populated than the faster decaying sublevels, similar to what has been observed for BChl a in methyltetrahydrofuran [19]. 

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