Do PCBs cause eggshell thinning?

The evidence that PCBs are involved in eggshell thinning is examined. In experiments in which both PCBs and DDE were used, it was found that DDE, but not PCBs, caused eggshell thinning of mallard and American kestrel. For two other species, bobwhite and Japanese quail, no thinning was observed with either agent.

Right to left shunt measurement in patients suspect for pulmonary embolism.

31 patients suspect for acute pulmonary emboli were studied by measuring arterial PO2 (room air) and right to left shunt (100% oxygen breathing) to determine if measurement of the right to left shunt aided in the diagnosis of pulmonary embolism. Ventilation/perfusion or serial perfusion lung scans were performed on each patient. All patients exhibited arterial hypoxemia (PaO2 less than or equal to 80) and 27 had a shunt greater than 7%.