Single photon emission computed tomographic blood flow and magnetic resonance volume imaging of basal ganglia in Huntington''s disease

During oogenesis in Drosophila, germ cells appear in sequential clusters of 16 interconnected cells. The events surrounding the differentiation of these cells are not fully understood. Here we present genetic and morphological analysis of mutations in the gene stand still (stil). Through complementation analyses we have refined the location of this gene to cyological region 49B-C. Our analyses of ovaries from ethylmethane sulfonate (EMS)-induced mutant alleles of this gene suggest that mutations in the stil gene produce a wide range of phenotypic abnormalities, from the absence of germ cells in the most severe alleles, to egg chambers with cytoskeletal defects in the less severe alleles. Our results suggest a role for this gene in specifying or maintaining a cytoskeletal component, with consequences during oogenesis and possibly during germ line sex determination.     

Group B rotavirus associated with an outbreak of neonatal lamb diarrhea

A 66-year-old woman was admitted because of postmenopausal vaginal bleeding. Diagnostic workup revealed a poorly differentiated endometrial adenocarcinoma. A total abdominal hysterectomy and bilateral salpingo-oophorectomy was carried out (FIGO stage Ia, G3). One and a half years later she developed a solitary humeral metastasis which was treated by local radiotherapy and progesterone acetate. Because osseous metastases in endometrial adenocarcinoma are rare, the literature is reviewed. In analogy to the treatment of pulmonary metastases the option of disarticulation of the patient's arm is discussed.     

Long-wavelength GaInNAs(Sb) lasers on GaAs

The boom in fiber-optic communications has caused a high demand for GaAs-based lasers in the 1.3-1.6-μm range. This has led to the introduction of small amounts of nitrogen into InGaAs to reduce the bandgap sufficiently, resulting in a new material that is lattice matched to GaAs. More recently, the addition of Sb has allowed further reduction of the bandgap, leading to the first demonstration of 1.5-μm GaAs-based lasers by the authors. Additional work has focused on the use of GaAs, GaNAs, and now GaNAsSb barriers as cladding for GaInNAsSb quantum wells. We present the results of photoluminescence, as well as in-plane lasers studies, made with these combinations of materials. With GaNAs or GaNAsSb barriers, the blue shift due to post-growth annealing is suppressed, and longer wavelength laser emission is achieved. Long wavelength luminescence out to 1.6 μm from GaInNAsSb quantum wells, with GaNAsSb barriers, was observed. In-plane lasers from these samples yielded lasers operating out to 1.49 μm, a minimum threshold current density of 500 A/cm² per quantum well, a maximum differential quantum efficiency of 75%, and pulsed power up to 350 mW at room temperature     

When the lines go down [telecommunications]

Telecommunications planning for national security and emergency preparedness in the post-divestiture (of AT&T) environment is examined. To ensure emergency telecommunications, a web of emergency structures, plans, and procedures are in place, with links from the local provider level to the national level. Involved in this web are: individual companies and providers, regional and national corporate entities, and state and local emergency management centers. Some of the measures in place are discussed. The augmentations or other equipment that can be deployed in any emergency and the role of satellite and wireless communication are described. The importance of human preparation is addressed. Lessons learned in past emergencies and the potential impact of emerging technologies in future emergencies are discussed