The Environmental Impact of not Having Paved Roads in Arid - download pdf or read online

By Keshkamat, Tsendbazar, Zuidgeest, Veen, Leeuw

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Since the first study by Nakayama and coworkers in 1961 (18), single unit studies have indicated that certain PO/AH neurons are thermosensitive and show changes in their firing rates when Tp 0 is changed, primarily by means of implanted, water-perfused thermodes. Among the temperature-sensitive neurons, the majority have been designated "warm-sensitive," and these increase their firing rates when the Tpo is increased; the others have been called "cold-sensitive," and these increase their firing rates when the T p o is decreased.

The incidence of extrahypothalamic thermosensitivity among populations of (a) warm-sensitive neurons and (b) cold-sensitive neurons. Neurons in each population are grouped according to their firing rates at Tpo 38°C (n = number of neurons). In each group, the proportion of neurons receiving thermal afférents from the skin or spinal cord is indicated by the shaded area. ] FOR THERMOREGULATION 43 receive relatively more inhibitory synaptic inputs from peripheral cold receptors. Experimentally, the first alternative (see Fig.

Each neuron in the diagram represents a population of neurons with similar properties. POH populations 1 and 2 have spontaneous firing rates, and their temperature coefficients differ as indicated. POH populations 3 and 4 do not have spontaneous firing rates and are temperature-independent. B. Firing rate vs. temperature curves of the 4 populations of POH neurons depicted above in 5-5A. A Q JQ of 2 is assumed for population 1, and a Q I Q of 1 for population 2. The firing rates of populations 3 and 4 at any Thy represent the difference between activities of 1 and 2.

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The Environmental Impact of not Having Paved Roads in Arid Regions by Keshkamat, Tsendbazar, Zuidgeest, Veen, Leeuw


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