Correlation of Optical, Structural, and Compositional Properties with V-Pit Distribution in InGaN/GaN Multiquantum Wells.

InGaN/GaN double heterostructures and multiquantum wells (MQWs) have been successfully developed since more than 20 years for LED lightning applications. Recent developments show that state-of-the-art LEDs benefit from artificially generated V-pit defects. However, the control of structural and chemical properties plays a tremendous role. In this paper, we report on the lateral distribution of V-pit defects and photoluminescence of InGaN/GaN MQWs grown on thick GaN on patterned sapphire substrates. The synchrotron-based scanning X-ray diffraction microscopy technique K-map was employed to locally correlate these properties with the local tilt, strain, and composition of the InGaN/GaN MQW. Compositional fluctuation is the main factor for the variation of photoluminescence intensity and broadening. In turn, V-pit defects align along small-angle grain boundaries and their strain fields are identified as a reason for promoting the InGaN segregation process on a microscale.

Epidural hematoma after outpatient epidural anesthesia.

IMPLICATIONS: Epidural hematoma is a rare complication of epidural anesthesia in healthy patients. Expedient diagnosis and treatment are essential to avoid permanent neurologic deficits. In an outpatient setting, patients should be instructed to communicate symptoms of severe back pain or weakness early.

Adenoma gigante da próstata: consideraçöes sobre dois casos / Prostatic giant adenoma: considerations on two cases

Os autores relatam dois casos de hiperplasia nodular da próstata, pesando respectivamente, 360 e 526g. Tecem comentários sobre a embriologia e a histologia prostática. Concluem ser adenomas de tais dimensöes achado infreqüente na prática urológica

Corpo estranho vesical: um diagnóstico a ser considerado / Foreign body in the bladder: a diagnostic to be considered

Os autores apresentam um caso incomum de uma paciente que, por prática masturbatória, introduziu na bexiga através da uretra o corpo de uma caneta esferográfica

Síndrome de Ogilvie pós-ureterolitotomia: relato de um caso e revisäo da literatura / Ogilvie`s syndrome post ureterolithotomy: report of a case and review of the literature

É apresentado um caso raro na prática urológica de pseudo-obstruçäo aguda do cólon síndrome de Ogilvie. Com base na revisäo da literatura, säo tecidos comentários etiopatológicos e terapêuticos

Fenda parcial da glande peniana / Partial cleft of the penis

Relata-se um caso raro de malformaçäo peniana relativo a uma fenda parcial na glande. Complementa-se com uma revisäo específica da literatura