An automated technique for monitoring carbon dioxide respired by insects*

ABSTRACT. A non-dispersive infrared gas analyser equipped with a Luft-type sonic detector and flow-through reference cell was automated to monitor the total volume of carbon dioxide (CO₂) respired by single insects or groups of insects. The infrared analyser was interfaced with an integrator for quantification, a microprocessor to control intermittent air flow through the insect respiration chambers, and a microcomputer for data storage and reduction. This technique has been used to monitor the CO₂ Output of diapausing and non-diapausing mature fifth instar larvae and of developing pupae of the codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae). The resulting data were accurate, quantitative and reproducible.     

Diabetic patients with myocardial infarction; the diagnostic accuracy of the electrocardiogram

In a study involving interpretation of electrocardiograms of two groups of patients who had myocardial infarction-one a group of diabetic patients and the other group made up of nondiabetic-the electrocardiogram was found to be considerably less accurate in the diagnosis of myocardial infarction in the diabetic patient than in the nondiabetic subject. This is due to the fact that the patterns which mask the diagnosis of myocardial infarction in nondiabetic patients occur more frequently in diabetic individuals. It is important to note that in no instance were the electrocardiograms interpreted as normal in the diabetic group.