Ascending aorta-right pulmonary artery anastomosis. Clinical experience with thirty-five patients with cyanotic congenital heart disease

The results of ascending aorta-right pulmonary artery anastomosis in 35 patients are reported. The patients ranged in age from 18 hours to 12 years; 16 were less than 12 months old. Seventeen had tetralogy of Fallot, six had pulmonary atresia and a ventricular septal defect, and eight had tricuspid atresia with hypoplasia of the right ventricle. In six infants under 4 months of age with tricuspid atresia, an atrial septal defect was made by the balloon catheter technique prior to the shunt operation. Four patients initially required digitalis for left heart failure. Three patients died in the postoperative period. The remaining 32 patients have been followed up to 3 years and have done well and maintained adequate shunts.

A new paradigm for learning of direct and indirect reference tasks in learning-set context

Reference properties were taught by means of a learning-set procedure in which each problem was divided into three parts. Part 1 and Part 2 provided a context whereby S could relate the transient stimuli found in those parts, to Part 3. Part 3 involved the use of the information gained in Parts 1 and 2 in mastering the task. One direct and three indirect reference tasks were designed with the least difficult resulting in 100% mastery and the most difficult in mastery by only 17% of Ss.

Trehalose Regulation of Glucose-6-Phosphate Hydrolysis in Blowfly Extracts

The presence of trehalose enhances the rate of glucose-6-phosphate hydrolysis in extracts of fat body and other tissues of adult Phormia regina Meigen. The activation appears to be specific, and increasing the concentration of trehalose changes both V(max) and K(m) for glucose-6-phosphate. There is, however, no easily recognizable phosphotransferase in the extract.