704 research outputs found
Robust surface electronic properties of topological insulators: Bi2Te3 films grown by molecular beam epitaxy
The surface electronic properties of the important topological insulator
Bi2Te3 are shown to be robust under an extended surface preparation procedure
which includes exposure to atmosphere and subsequent cleaning and
recrystallization by an optimized in-situ sputter-anneal procedure under ultra
high vacuum conditions. Clear Dirac-cone features are displayed in
high-resolution angle-resolved photoemission spectra from the resulting
samples, indicating remarkable insensitivity of the topological surface state
to cleaning-induced surface roughness.Comment: 3 pages, 3 figure
Lessons Learned from the September 11th Disaster: A State Health Agency Perspective
The New York State Department of Health has conducted a number of studies over the past 10 years investigating health impacts related to the September 11, 2001 (9/11) disaster among New York City residents and New York State World Trade Center (WTC) responders. Efforts to evaluate the health effects of WTC exposures in these cohorts presented numerous challenges, including study design and associated concerns about bias, identifying the affected populations, gaining community support and participation, and determining the most appropriate clinical testing and follow-up approaches. The unique position of a state public health agency provided multiple points of support for these efforts. An overview of what was found and the lessons learned during the response to the 9/11 disaster is presented, from the viewpoint of a state public health agency
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Stress relaxation in SSC collared coils and their component materials
Previous work, reported at last year's meeting, has been continued. One model section of an SSC outer coil has had it's stress relaxation measured for nearly two years. In addition, the stress relaxation of SSC cable without insulation has been measured. Kapton insulation alone has been studied both in creep and stress relaxation. Creep has been measured parallel to the plane of the film. These measurements are dependent on internal stresses that may be present in the film and on the moisture content of the film. They indicate that any measurements of coil relaxation are not likely to be repeatable if these factors are not controlled. The measurements on Kapton film alone are being done at different temperatures to obtain a time-temperature shift factor so that measurements at one temperature may be used to predict relaxation at any other temperature. 12 refs., 8 figs
AnatomÃa del tobillo-pie en cortes (correlato con imágenes radiológicas)
El uso diario de las imágenes médicas en los traumatismos de miembro inferior y su prevalencia en el segmento tobiÂllo-pie, fue lo que estimuló la realización de este trabajo. Debido a ello decidimos correlacionar cortes cadavéricos de tipo coronal, axial y sagital con sus radiografÃas, para brindar una guÃa al enfoque diagnóstico del tobillo-pie. Como resultado obtuvimos la disposición particular que adquieren en el espacio, las estructuras anatómicas según la proyección del corte, con sus interrelaciones profundas y de superficie; ajustándonos al nuevo paradigma: la anatomÃa espacial en imágenes diagnósticas de tomografÃa axial computada y resonancia magnética. La observación metódica y sistemática de elementos del tobillo-pie en cortes, es una contribución pedagógica, aplicable a la interpretación topográfica de imágenes normales, que servirÃa de ayuda al estudiante y médico general.
The Potential of MET Immunoreactivity for Prediction of Lymph Node Metastasis in Early Oral Tongue Squamous Cell Carcinoma
Objective MET positivity is independently associated with survival in oral squamous cell carcinoma (OSCC). Since MET is a known orchestrator of invasive tumor growth, we investigated its association with LNM in early oral tongue squamous cell carcinoma (OTSCC). As it is recommended by the NCCN to use tumor depth of invasion (DOI) in making decisions on elective neck dissection (END), the results obtained for MET positivity were aligned with those for DOI > 4 mm. The cutoff value used in our institution. Methods Tumor samples from patients who underwent primary tumor resection and neck dissection between 1995 and 2013, were collected from the archives of the Leiden and Erasmus University Medical Center. Immunohistochemistry with D1C2 was performed to identify MET negative (= 10% uniform positivity) cancers. ROC curve analysis and the Chi-squared test were used to investigate the association of MET positivity with LNM (pN+ and occult). Binary logistic regression was used to investigate the association of MET positivity with LNM. Results Forty-five (44.1%) of the 102 cancers were MET positive. Ninety were cN0 of which 20 were pN+ (occult metastasis). The remaining 12 cancers were cN+, of which 10 were proven pN+ and 2 were pN0. MET positivity was associated with LNM with a positive predictive value (PPV) of 44.4% and a negative predictive value (NPV) of 82.5% for pN+. For the occult group, the PPV was 36.8% and the NPV was 88.5%. Regression analysis showed that MET positivity is associated with pN+ and occult LNM (p-value < 0.05). Conclusion MET positivity is significantly associated with LNM in early OTSCC, outperforming DOI. The added value of MET positivity could be in the preoperative setting when END is being considered during the initial surgery. For cases with DO
Morphological alterations of small intestinal epithelium of calves caused by feeding soybean protein.
The objective of this experiment was to detect alterations of small intestinal mucosa due to incorporation of large amounts of soybean protein in milk replacers and to relate these alterations to calf performance
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