350 research outputs found
Co-opertition: Competitive Communication Behavior During a Cooperative Task
A combined effort of two classes at separate universities was examined. Each class boasted six groups which were paired with another group at the other university. These teams used computer mediated communication to engage in a cooperative task. The communications between groups were analyzed using conversational analytic techniques to reveal a competitive communication pattern. The results show that a lack of communication can produce competitive behaviors even in situations intended to nurture cooperation. Future concerns should focus on teaching groups to use computer mediated communication (CMC) to its fullest potential by recognizing and accounting for the critical differences between CMC and other communication channels
The occurrence patterns of eye-hand preference in athletes and non-athletes
Eye and hand preferences were determined for 268 elite athletes and 90 non-athletes to determine occurrence patterns. Comparisons were made between athletes and nonathletes to evaluate patterns of ocular preference, hand preference and tendencies for homolateral or crossed preference. No significant differences were found for ocular or hand preferences in athletes versus nonathletes. Similarly, no significant differences were shown for homolateral or crossed preferences. Recommendations for standardizaton of evaluation technique related to eye and hand preferences are discussed
Parallel integral projection transform for straight electrode localization in 3-D ultrasound images
Biomarkers of nucleic acid oxidation, polymorphism in, and expression of, hOGG1 gene in styrene-exposed workers.
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Immune phenotypes predict survival in patients with glioblastoma multiforme
Background: Glioblastoma multiforme (GBM), a common primary malignant brain tumor, rarely disseminates beyond
the central nervous system and has a very bad prognosis. The current study aimed at the analysis of immunological
control in individual patients with GBM.
Methods: Immune phenotypes and plasma biomarkers of GBM patients were determined at the time of diagnosis
using flow cytometry and ELISA, respectively.
Results: Using descriptive statistics, we found that immune anomalies were distinct in individual patients. Defined
marker profiles proved highly relevant for survival. A remarkable relation between activated NK cells and improved
survival in GBM patients was in contrast to increased CD39 and IL-10 in patients with a detrimental course and very
short survival. Recursive partitioning analysis (RPA) and Cox proportional hazards models substantiated the
relevance of absolute numbers of CD8 cells and low numbers of CD39 cells for better survival.
Conclusions: Defined alterations of the immune system may guide the course of disease in patients with GBM
and may be prognostically valuable for longitudinal studies or can be applied for immune intervention
Can cells solve mazes? Understanding cells responses to wound healing
Wound healing is a complex process that occurs after the body\u27s tissue has been damaged or impaled by a foreign object. Cells must travel from all over the body to the site of injury. The goal of this project is to understand what affects the migration of fibroblast cells in order to develop more effective wound treatments. Our research has aimed to develop a way to map the decision-making processes of fibroblasts that drive their migration to a wound site. We have addressed this by asking the question: can cells solve mazes? Our team has developed several methodologies by which we have been able to study the responsiveness of fibroblasts to certain cues. Specifically the migration of the cells has been tracked relative to physical barriers created by the walls of the maze and chemical concentration gradients. Preliminary results have demonstrated the feasibility of this apparatus for a mode of studying cell proliferation and migration
Neutron recognition in the LAND detector for large neutron multiplicity
The performance of the LAND neutron detector is studied. Using an
event-mixing technique based on one-neutron data obtained in the S107
experiment at the GSI laboratory, we test the efficiency of various analytic
tools used to determine the multiplicity and kinematic properties of detected
neutrons. A new algorithm developed recently for recognizing neutron showers
from spectator decays in the ALADIN experiment S254 is described in detail. Its
performance is assessed in comparison with other methods. The properties of the
observed neutron events are used to estimate the detection efficiency of LAND
in this experiment.Comment: 16 pages, 8 figure
The interaction studied via femtoscopy in p + Nb reactions at
We report on the first measurement of and correlations via
the femtoscopy method in p+Nb reactions at , studied with the High Acceptance Di-Electron Spectrometer
(HADES). By comparing the experimental correlation function to model
calculations, a source size for pairs of and a slightly
smaller value for of is extracted.
Using the geometrical extent of the particle emitting region, determined
experimentally with correlations as reference together with a source
function from a transport model, it is possible to study different sets of
scattering parameters. The correlation is proven sensitive to
predicted scattering length values from chiral effective field theory. We
demonstrate that the femtoscopy technique can be used as valid alternative to
the analysis of scattering data to study the hyperon-nucleon interaction.Comment: 12 pages, 11 figure
The High-Acceptance Dielectron Spectrometer HADES
HADES is a versatile magnetic spectrometer aimed at studying dielectron
production in pion, proton and heavy-ion induced collisions. Its main features
include a ring imaging gas Cherenkov detector for electron-hadron
discrimination, a tracking system consisting of a set of 6 superconducting
coils producing a toroidal field and drift chambers and a multiplicity and
electron trigger array for additional electron-hadron discrimination and event
characterization. A two-stage trigger system enhances events containing
electrons. The physics program is focused on the investigation of hadron
properties in nuclei and in the hot and dense hadronic matter. The detector
system is characterized by an 85% azimuthal coverage over a polar angle
interval from 18 to 85 degree, a single electron efficiency of 50% and a vector
meson mass resolution of 2.5%. Identification of pions, kaons and protons is
achieved combining time-of-flight and energy loss measurements over a large
momentum range. This paper describes the main features and the performance of
the detector system
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