The main challenge for light-emitting diodes is to increase the efficiency in the green part of the spectrum. Gallium phosphide (GaP) with the normal cubic crystal structure has an indirect band gap, which severely limits the green emission efficiency. Band structure calculations have predicted a direct band gap for wurtzite GaP. Here, we report the fabrication of GaP nanowires with pure hexago...

We present ab initio density functional investigations of the atomic and electronic structure of gallium nitride nanodots and nanowires. With increasing diameter, the average Ga-N bond length in the nanostructures increases, as does the relative stability (heat of formation), approaching the values for bulk GaN. As the diameter decreases, the band gap increases, with the variation for the nanod...

Wurtzitic gallium nitride nano- and microleaves were controlled grown through a facile chemical vapor deposition method. This is the first report of GaN nanoleaves, a new morphology of GaN nanostructures. The as-grown GaN structures were characterized by means of X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray, transmission electron microscopy, and selected area ...

introduction: gallium-67 citrate has been known as a good infection agent in nuclear medicine for decades. in this work the value of 67ga-citrate has been investigated in infected animal models using spect imaging at optimized/standardized conditions. methods: the bacterial (staphylococcus aureus; s.a. and escherichia coli; e.c.) and fungal (candidae albicans; c.a.) species from standard sourc...

Quiz 1. What is the diagnosis? 2. Describe the characteristic patterns shown in the Gallium-67 scan (Fig. 2). 3. Skin lesions occur in 75% of patients with this condition. Is this true or false? 4. Lesions respond to treatment with corticosteroids. Is this true or false? 5. Spontaneous remissions occur in nearly two-thirds of patients, but the course is chronic or progressive in 10% to 30%. Is ...

Two cases of pyothorax-associated malignant lymphoma were reported. The presence of chronic tuberculous pyothorax after thoracoplasty and the development of non-Hodgkin's lymphoma on the chest wall are closely related. Both patients had suffered from tuberculous pyothorax for more than thirty years, and developed new painful chest wall tumors. CT and MRI delineated both malignant lymphoma and p...

  Introduction: Although PET scanning using F-18[FDG] is considered the superior radiotracer for tumnor imaging, Gallium-67 is still in use for some malignancies such as lymphoma and hepatoma. One of the strategies to improve the diagnostic accuracy of Gallium is to perform SPECT which is reported to be more sensitive compared to planar imaging. In this study we compa...