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Norepinephrine in ventral tegmental neurons and its role in the regulation of cortical rhythms.
A major role of noradrenergic neurotransmission in the central nervous system is the regulation of arousal and attention. The dorsal noradrenergic system is activated in the course of wakefulness and exerts a tonic control of arousal by stimulating postsynaptic alpha1- and beta2-adrenoceptors. The ventral noradrenergic system plays a key role in the generation of several rhythms of the cortex, being involved in the generation of slow oscillations and in the control of the state of vigilance by means of activation of beta1- and beta2-adrenoceptors. In this review, we provide a summary of the recent advances in the knowledge of the anatomical and functional organization of the ventral noradrenergic system, and the role played by norepinephrine (NE) in the regulation of cortical rhythms. and then, upon the application of a potentiometer controlling the flow of the through-feed of air the burner is switched off when the temperature in the combustion chamber exceeds the preset temperature. However, it is necessary to provide a separate valving system in order to prevent the through-feed of air to the burner when the temperature is below the preset temperature. This requirement entails an increase in the complexity and cost of the apparatus.
The known apparatus described in German published patent specification No. 1,239,166 provides the same function as that of the known apparatus described in German patent specification No. 2,352,204 with the additional feature that no separate valve is required for the through-feed of air. This is achieved by virtue of the provision of an adjustable opening in the wall separating the combustion chamber from the convection chamber, whereby the opening is automatically blocked when the combustion chamber temperature reaches the preset temperature.
However, the known apparatus described in German patent specification No. 2,352,204 has the disadvantage that, even when the combustion chamber temperature has reached the preset temperature, it may still be possible for some fuel to pass through the opening from the convection chamber to the combustion chamber, whereby the efficiency of the apparatus is reduced. The object of the present invention is to provide an apparatus for burning fossil fuels in air for heating a building, which apparatus provides improved combustion efficiency over the prior art apparatuses.
The object of the present invention is achieved by an apparatus for burning fossil fuels in air which has the characteristics defined in the independent claims. 3125841983
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