785 resultados para Intellectual and Developmental Disabilities


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The drive on respiration mediated by the peripheral arterial chemoreceptors was assessed by the hyperoxic test in 3-day-old rat pups. They accounted for 22.5 +/- 8.8% during control conditions, but only for 6.9 +/- 10.0% after nicotine exposure, an effect counteracted by blockade of peripheral dopamine type 2 receptors (DA2Rs). Furthermore, nicotine reduced dopamine (DA) content and increased the expression of tyrosine hydroxylase (TH) in the carotid bodies, further suggesting that DA mediates the acute effect of nicotine on arterial chemoreceptor function. During postnatal development TH and DA2R mRNA levels in the carotid bodies decreased. Thus, nicotine from smoking may also interfere with the postnatal resetting of the oxygen sensitivity of the peripheral arterial chemoreceptors by increasing carotid body TH mRNA, as well as DA release in this period. Collectively these effects of nicotine on the peripheral arterial chemoreceptors may increase the vulnerability to hypoxic episodes and attenuate the protective chemoreflex response. These mechanisms may underlie the well-known relation between maternal smoking and sudden infant death syndrome.

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Description based on: FY89 (April 1988-June 1989).

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On cover: Guidelines for establishing day camp programs.

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Identifies boards and commissions on which either the Director or the Director's designee serve or which have an interest in the Department's activities.

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"Annual report by the Office of the Inspector General to the Governor and the General Assembly is required by Public Act 85-223, allegations of abuse and neglect within the Department."

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Description based on: January 1989 - January 1990; title from cover.