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We present a case of cerebriform nevus sebaceus in an 18-year-old boy. This form of nevus sebaceus is quite rare, in contrast to the relatively common linear variant.

Tuberculosis is a ubiquitous disease and a public health problem of major importance in almost all developing and underdeveloped countries. It can involve any part of the body, including the eye. We report a case of a young child presenting with a painful blind eye with leucocoria, where a misdiagnosis of retinoblastoma was made clinically. The eye was enucleated, and subsequent pathological examination led to a final diagnosis of ocular tuberculosis. The patient was put on anti-tubercular treatment, and responded well.

The thermal annealing of nitrogen related traps in p-type InGaAsN and GaAsN is investigated by deep level transient spectroscopy (DLTS). Upon annealing, an apparent recovery of the photovoltaic properties correlates with changes in the DLTS data observed for InGaAsN and GaAsN diodes and solar cells, revealing that a nitrogen related E1 (EC−0.20eV) center has an important role in governing the solar cell performance. The large electron capture cross section (∼8.9×10−15cm2) of this center indicates that this defect may act as an efficient recombination center. Therefore, its complete removal by annealing or by some other process is essential for the high performance of GaInAsN solar cells. The internal quantum efficiency data were modeled to quantify the change in material properties associated with this improvement upon annealing. Annealed cells with indium impurity (InGaAsN) show a slightly higher photoresponse, which could be due to low scattering caused by In–N pair formation after annealing.