Cellular Array Morphology During Directional Solidification

Cellular array morphology has been examined in the shallow cell, deep cell, and cell-to-dendrite transition regime in Pb-2.2 wt pct Sb and Al-4.1 wt pct Cu alloy single-crystal samples that were directionally solidified along [100]. Statistical analysis of the cellular spacing distribution on transverse sections has been carried out using minimum spanning tree (MST), Voronoi polygons, radial distribution factor, and fast Fourier transform (FFT) techniques. The frequency distribution of the number of nearest neighbors and the MST parameters suggest that the arrangement of cells may be visualized as a hexagonal tessellation with superimposed 50 pct random noise. However, the power spectrum of the Fourier transform of the cell centers shows a diffused single-ring pattern that does not agree with the power spectrum from the hexagonal tessellation having a 50 pct superimposed random (uniformly distributed or Gaussian) noise. The radial distribution factor obtained from the cells is similar to that of liquids. An overall steady-state distribution in terms of the mean primary spacing is achieved after directional solidification of about three mushy-zone lengths. However, the process of nearest-neighbor interaction continues throughout directional solidification, as indicated by about 14 pct of the cells undergoing submerging in the shallow cell regime or by an increasing first and second nearest-neighbor ordering along the growth direction for the cells at the cell-to-dendrite transition. The nature of cell distribution in the Al-Cu alloy appears to be the same as that in the Pb-Sb. The ratio between the upper and lower limits of the primary spacing, as defined by the largest and the smallest 10 pct of the population, respectively, is constant: 1.43 +/- 0.11. It does not depend upon the solidification processing conditions

An Outcome Assessment of a Single Institution\u27s Longitudinal Experience with Uveal Melanoma Patients with Liver Metastasis.

There is no FDA-approved treatment for metastatic uveal melanoma (UM) and overall outcomes are generally poor for those who develop liver metastasis. We performed a retrospective single-institution chart review on consecutive series of UM patients with liver metastasis who were treated at Thomas Jefferson University Hospital between 1971–1993 (Cohort 1, n = 80), 1998–2007 (Cohort 2, n = 198), and 2008–2017 (Cohort 3, n = 452). In total, 70% of patients in Cohort 1 received only systemic therapies as their treatment modality for liver metastasis, while 98% of patients in Cohort 2 and Cohort 3 received liver-directed treatment either alone or with systemic therapy. Median Mets-to-Death OS was shortest in Cohort 1 (5.3 months, 95% CI: 4.2–7.0), longer in Cohort 2 (13.6 months, 95% CI: 12.2–16.6) and longest in Cohort 3 (17.8 months, 95% CI: 16.6–19.4). Median Eye Tx-to-Death OS was shortest in Cohort 1 (40.8 months, 95% CI: 37.1–56.9), and similar in Cohort 2 (62.6 months, 95% CI: 54.6–71.5) and Cohort 3 (59.4 months, 95% CI: 56.2–64.7). It is speculated that this could be due to the shift of treatment modalities from DTIC-based chemotherapy to liverdirected therapies. Combination of liver-directed and newly developed systemic treatments may further improve the survival of these patients

Discovertebral (Andersson) lesions of the spine in ankylosing spondylitis revisited

A well-known complication in patients with ankylosing spondylitis (AS) is the development of localised vertebral or discovertebral lesions of the spine, which was first described by Andersson in 1937. Since then, many different terms are used in literature to refer to these localised lesions of the spine, including the eponym ‘Andersson lesion’ (AL). The use of different terms reflects an ongoing debate on the exact aetiology of the AL. In the current study, we performed an extensive review of the literature in order to align communication on aetiology, diagnosis and management between treating physicians. AL may result from inflammation or (stress-) fractures of the complete ankylosed spine. There is no evidence for an infectious origin. Regardless of the exact aetiology, a final common pathway exists, in which mechanical stresses prevent the lesion from fusion and provoke the development of pseudarthrosis. The diagnosis of AL is established on conventional radiography, but computed tomography and magnetic resonance imaging both provide additional information. There is no indication for a diagnostic biopsy. Surgical instrumentation and fusion is considered the principle management in symptomatic AL that fails to resolve from a conservative treatment. We advise to use the term Andersson lesion for these spinal lesions in patients with AS

Reflexiones sobre las razas y el racismo; el problema de los negros, los indios, el nacionalismo y la modernidad. Dimensión Antropológica Vol. 14 Año 5 (1998) septiembre-diciembre

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Race, class and national image in Venezuela, Austin, University of Texas Press, 1990.El propósito central de este trabajo es explorar los problemas analíticos que abordan una serie de estudios etnohistóricos y antropológicos acerca de grupos afroamericanos publicados en el extranjero y se examinan casos del Caribe, Centroamérica, Sudamérica, y Estados Unidos. Obviamente, la situación histórica y actual de México es distinta; pero ya que la investigación referente a poblaciones africanas y el impacto cultural de las diferencias raciales es relativamente poco desarrollada aquí, planteo la siguiente pregunta: ¿Qué se puede aprender de la amplia documentación referente a otras regiones, donde hay una larga tradición de trabajo científico acerca de los africanos en América, para avanzar en los estudios históricos y antropológicos sobre México? Es imposible investigar acerca de la población de origen africano y sus descendientes en el nuevo mundo sin enfrentar los complejos temas del racismo, la etnicidad, la estratificación social, el colonialismo y el nacionalismo. Hacer una síntesis de la discusión sobre estos problemas resulta sumamente difícil ya que conduce a los debates más espinosos en las ciencias sociales contemporáneas

The Effect of Federal Funding on Clinical Productivity: The Price of Academics

Research is time consuming and expensive. To offset this expense, federal agencies fund the research, but the financial impact of funded research on clinical surgical productivity has not been studied. The objective is to determine departmental impact of federal funding. The relative value units, professional revenue, and funding were evaluated for clinical Faculty in the Surgery Department for fiscal year 2008. Means were compared using t test, and significance was defined as p<0.05. The Department had 61 clinical surgeons. The Department was divided into three groups based on research funding: unfunded, industry funded, and federally funded. Surgeons with both federal funding and other funding were only included in the federally funded group. There were 42 unfunded, 8 industry funded, and 11 federally funded surgeons. The relative value units, professional revenue, and salary with benefits of the three groups were compared. Federal funding is associated with a significant reduction in clinical work and clinical reimbursement. Federally funded research results in a net loss of revenue for the Surgery Department. The net effect is that the Surgery Department sponsors Federal Research and this has not been previously reported in the literature