411 research outputs found
The polarization of Lyman alpha radiation produced in charge transfer collisions between protons and the inert gases
Polarization of Lyman alpha radiation in proton collisions with helium, argon, and neon atom
The polarization of Lyman alpha radiation produced by direct excitation of hydrogen atoms by proton impact
Lyman alpha radiation measurement in collision between protons and hydrogen atom
Population‐based study of anastomotic stricture rates after minimally invasive and open oesophagectomy for cancer
Background
The population‐based incidence of anastomotic
stricture after minimally invasive oesophagectomy (MIO) and open
oesophagectomy (OO) is not known. The aim of this study was to compare
rates of anastomotic stricture requiring dilatation after the two
approaches in an unselected cohort using nationwide data from Finland
and Sweden.
Methods
All patients who had MIO or OO for oesophageal cancer
between 2007 and 2014 were identified from nationwide registries in
Finland and Sweden. Outcomes were the overall rate of anastomotic
stricture and need for single or repeated (3 or more) dilatations for
stricture within the first year after surgery. Multivariable Cox
regression provided hazard ratios (HRs) with 95 per cent confidence
intervals, adjusted for age, sex, co‐morbidity, histology, stage, year,
country, hospital volume, length of hospital stay and readmissions.
Results
Some 239 patients underwent MIO and 1430 had an open
procedure. The incidence of strictures requiring one dilatation was 16·7
per cent, and that for strictures requiring three or more dilatations
was 6·6 per cent. The HR for strictures requiring one dilatation was not
increased after MIO compared with that after OO (HR 1·19, 95 per cent
c.i. 0·66 to 2·12), but was threefold higher for repeated dilatations
(HR 3·25, 1·43 to 7·36). Of 18 strictures following MIO, 14 (78 per
cent) occurred during the first 2 years after initiating this approach.
Conclusion
The need for endoscopic anastomotic dilatation after
oesophagectomy was common, and the need for repeated dilatation was
higher after MIO than following OO. The increased risk after MIO may
reflect a learning curve.
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Depth of invasion, tumor budding, and worst pattern of invasion : Prognostic indicators in early-stage oral tongue cancer
Peer reviewe
A Self-Consistent Model for Positronium Formation from Helium Atoms
The differential and total cross sections for electron capture by positrons
from helium atoms are calculated using a first-order distorted wave theory
satisfying the Coulomb boundary conditions. In this formalism a parametric
potential is used to describe the electron screening in a consistent and
realistic manner. The present procedure is self consistent because (i) it
satisfies the correct boundary conditions and post-prior symmetry, and (ii) the
potential and the electron binding energies appearing in the transition
amplitude are consistent with the wave functions describing the collision
system. The results are compared with the other theories and with the available
experimental measurements. At the considered range of collision energies, the
results agree reasonably well with recent experiments and theories.
[Note: This paper will be published on volume 42 of the Brazilian Journal of
Physics
Ionization mechanism of negative ion-direct analysis in real time: A comparative study with negative ion-atmospheric pressure photoionization
A minor role of asparaginase in predisposing to cerebral venous thromboses in adult acute lymphoblastic leukemia patients
Cerebral venous thrombosis (CVT) covers up to a third of all venous thromboses (VTs) detected in patients with acute lymphoblastic leukemia (ALL). It usually hampers patients' lives and may also endanger efficient leukemia treatment. Although many factors have been suggested to account for an elevated risk of VTs in patients with ALL, there still is a lack of studies focusing on CVTs and especially in the setting of adult ALL patients. We studied in our retrospective population-based cohort the occurrence, characteristics, as well as risk factors for VTs in 186 consecutively diagnosed Finnish adult ALL patients treated with a national pediatric-inspired treatment protocol ALL2000. In the risk factor analyses for VTs we found a distinction of the characteristics of the patients acquiring CVT from those with other kinds of VTs or without thrombosis. In contrast to previous studies we were also able to compare the effects of asparaginase in relation to CVT occurrence. Notably, more than half of the CVTs were diagnosed prior the administration of asparaginase which accentuates the role of other risk factors on the pathophysiology of CVT compared to truncal or central venous line (CVL) VTs in adult ALL patients
Leader-member exchange (LMX) differentiation and work outcomes:conceptual clarification and critical review
According to Leader-member Exchange (LMX) theory, leaders develop different quality relationships with followers in their team (termed LMX differentiation). An important theoretical question concerns how different LMX relationships within a team affect followers’ work outcomes. This paper provides a critical review of the concept of LMX differentiation. We propose that the LMX differentiation process leads to patterns of LMX relationships that can be captured by three properties (central tendency, variation, and relative position). We describe a taxonomy illustrating the different ways these properties have been conceptualized and measured. We identify two approaches to LMX differentiation as being a ‘perspective of the team’ (that are shared amongst team members) or a ‘perspective of the follower’ (subjective perceptions unique to each follower). These perspectives lead to different types of measures that predict different outcomes at the individual and team levels. We describe theoretical models employed to explain the effects of LMX differentiation (justice, social comparison and social identity theories). Generally, the lower the within-team variation in LMX or the more a team member’s LMX is higher than the mean team LMX, the better are the work outcomes, but many moderators condition these effects. Finally, we identify some key areas for future research
Evaluation of neuroendocrine markers in renal cell carcinoma
<p>Abstract</p> <p>Background</p> <p>The purpose of the study was to examine serotonin, CD56, neurone-specific enolase (NSE), chromogranin A and synaptophysin by immunohistochemistry in renal cell carcinomas (RCCs) with special emphasis on patient outcome.</p> <p>Methods</p> <p>We studied 152 patients with primary RCCs who underwent surgery for the removal of kidney tumours between 1990 and 1999. The mean follow-up was 90 months. The expression of neuroendocrine (NE) markers was determined by immunohistochemical staining using commercially available monoclonal antibodies. Results were correlated with patient age, clinical stage, Fuhrman grade and patient outcome.</p> <p>Results</p> <p>Eight percent of tumours were positive for serotonin, 18% for CD56 and 48% for NSE. Chromogranin A immunostaining was negative and only 1% of the tumours were synaptophysin immunopositive. The NSE immunopositivity was more common in clear cell RCCs than in other subtypes (<it>p </it>= 0.01). The other NE markers did not show any association with the histological subtype. Tumours with an immunopositivity for serotonin had a longer RCC-specific survival and tumours with an immunopositivity for CD56 and NSE had a shorter RCC-specific survival but the difference was not significant. There was no relationship between stage or Fuhrman grade and immunoreactivity for serotonin, CD56 and NSE.</p> <p>Conclusions</p> <p>Serotonin, CD56 and NSE but not synaptophysin and chromogranin A are expressed in RCCs. However, the prognostic potential of these markers remains obscure.</p
Human Bone Marrow Mesenchymal Stem Cells Induce Collagen Production and Tongue Cancer Invasion
Peer reviewe
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