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A new study investigates the photoreflectance response of Te-doped GaSb samples at the epsilon0+delta0 transition.

Low temperature diamagnetic shifts and FWHM linewidths of excitonic transitions in Al[sub x]Ga[sub 1-x]As alloys are reported as a function of magnetic field (50T maximum) at 4K using photoluminescence spectroscopy. Two samples with aluminum compositions of 5 and 20%, are discussed. The slope of the diamagnetic shift at high fields allows a direct measure of the excitonic reduced mass μ. [ABSTRACT FROM AUTHOR]

Background: The proper development of the dental arches, including the eruption and correct positioning of the canines in the arch, is essential for the oral health of growing patients. Impacted canines not only give rise to functional challenges but also pose esthetic issues for patients. The aim of this article is to show if it is possible to benefit from the exclusive use of transparent aligners to guide the eruption of ectopic upper canines into the arch in the correct position., Case Report: The subject of the study is the clinical case of a 13-year-old female growing patient who presented displaced upper permanent canines located in the palatal ectopic site. Following the surgical extraction of the retained deciduous elements, treatment with aligners for repositioning the ectopic canines in the arch was performed in two phases. At the end of the treatment, a Class I canine was achieved with satisfactory repositioning of the upper canines in the arch., Conclusion: The use of transparent aligners makes it possible, with some procedural precautions and in carefully selected cases, to reposition the ectopic palatal canines in the dental arch using a treatment that is both esthetic and effective.

A long term follow up of thirty two patients operated on for Kienböck's disease of the semilunar bone at the Istituto Ortopedico Toscano in the last twenty eight years has been carried out. Three types of operation were performed; excision of the semilunar, lengthening of the ulna, and shortening of the radius. The best results were obtained from shortening the radius. Good results were also obtained in cases in which there was no preoperative relative shortening of the ulna at the inferior radio-ulnar joint.

Echocardiographic studies were performed both before and after commissurotomy on fifteen subjects affected by non-calcified mitral stenosis. The amplitude CE of the anterior leaflet dis placement, the slope of the CD and EF intervals, the amplitude of the A-wave, the ratio FA/DE and the reciprocal position of the anterior and posterior leaflet echoes were measured on the echographic records. These data were compared with the values obtained in ten normal subjects. After commissurotomy, the slope of the CD interval and most evidently that of the EF interval increased (the last one by a factor of 3), and the area of the mitral opening was found to be more than 9% larger. The A-wave reappeared clearly in 30% of the operated patients, and the outline of the posterior leaflet was no longer inscribed in the anterior leaflet diastolic curve in all cases; the amplitude CE was unchanged.

A patient with an aneurysm of the aortic arch is presented. The patient underwent successful surgical correction using deep hypothermia with circulatory arrest and preserving an aortic cuff including the supra-aortic trunks to facilitate the anastomosis with the prosthesis. Technical and tactical detail are also discussed.