Electron injection from colloidal PbS quantum dots into titanium dioxide nanoparticles.

Injection of photoexcited electrons from colloidal PbS quantum dots into TiO(2) nanoparticles is investigated. The electron affinity and ionization potential of PbS quantum dots, inferred from cyclic voltammetry measurements, show strong size dependence due to quantum confinement. On the basis of the measured energy levels, photoexcited electrons should transfer efficiently from the quantum dots into TiO(2) only for quantum-dot diameter below approximately 4.

Missile embolism to the pulmonary artery: case report and pitfalls of management.

Missile embolism to the pulmonary artery is a rare event. We present a complicated case of missile embolism from the inferior vena cava to the pulmonary artery. The case illustrates the potential pitfalls in the management of these patients.

Splenic infarction caused by a large thoracic aortic thrombus.

We report on a patient with left upper quadrant pain as a result of splenic infarction; the patient was subsequently found to have a thoracoabdominal aortic thrombus extending through the celiac axis. The patient was successfully treated with an aortic thrombectomy guided by intraoperative transesophageal echocardiography.

Free-tissue transfers for limb salvage utilizing in situ saphenous vein bypass conduit as the inflow.

Using vein grafts to bypass sclerotic and occluded arterial segments is a well-established technique in vascular surgery. For infrapopliteal bypass, autogenous veins have better patency rates than synthetic grafts. Although not resolved, in situ bypasses seem to be better than reversed bypasses, especially for "far away" segments.