The concentration of urea in the excreta of the 6th instar larvae of Spodoptera mauritia varies from 4.017 +/- 0.541 to 31.052 +/- 1.193 mumoles/g dry excreta (mean +/- SE). The observation confirms that urea excreted is of metabolic origin.
The concentration of ammonia in the fresh and dry excreta of Lamida moncusaIis Walker was determined. It was found that a large quantity of ammonia was lost from the excreta on drying. Ammonia is one of the major excretory products of the larva.Summary. The blood pressure and heart rate responses to intravenous dopamine infusion at 2.5, 5.0 and 10.0 ~g. min -~-100 g-~ were studied in conscious and pentobarbital-anesthetized Sprague -Dawley rats. In the conscious rats, dopamine caused a significant dose-related increase in the mean arterial blood pressure which was abolished in the anesthetized rats. The heart rate increased significantly only at the highest dose infused. The responses to equipressor doses of noradrenaline (40 ng-min-~.100g ~) and phenylephrine (1.0 pg" min -~" 100 g-~) were also suppressed in the anesthetized rats. The results suggest that pentobarbital anesthesia depresses the blood pressure response to dopamine infusion in the rat through a depression of activation of alpha-adrenoceptors.
Invertase activity has been studied in the fore-, mid- and hindgut of the 6th instar larva of Spodoptera mauritia. The highest activity was in the midgut except during the early hours of the larva period when the foregut showed comparatively increased activity. The hindgut invertase activity may be from the voiding of enzyme along with the undigested food.
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