1,186 research outputs found
Effects of Developmental Training of Basketball Cadets Realised in the Competitive Period
The analysis of effects of a two-month developmental training cycle realised within a
basketball season revealed statistically significant positive changes at the multivariate
level in components of motor-functional conditioning (fitness) status of the sample of
talented basketball cadets (15–16 years). The greatest correlations with discriminant
function were found in variables with statistically significant changes at the univariate
level, more explicitly in variables of explosive and repetitive power of the upper body and
trunk, anaerobic lactic endurance, as well as in jumping type explosive leg power. The
presented developmental conditioning training programme, although implemented within
the competitive period, induced multiple positive fitness effects between the two control
time points in this sample of basketball players. The authors suggest that, to assess
power of shoulders and upper back, the test overgrip pull-up should not be applied to
basketball players of this age due to its poor sensitivity. Instead, they propose the undergrip
pull-up test , which is a facilitated version of the same test. The results presented in
this article reinforce experienced opinion of experts that, in the training process with
youth teams, the developmental conditioning training programme is effectively applicable
throughout the entire competitive season. The proposed training model is a system
of various training procedures, operating synergistically, aimed at enhancing integral
fitness (preparedness) of basketball players. Further investigations should be focused on
assessing effects of both the proposed and other developmental training cycle programmes,
by means of assessing and monitoring actual quality (overall performance) of players,
on the one hand, and, on the other, by following-up hormonal and biochemical
changes over multiple time points
Methorics of the Precipitation Processes. XXIV. Flocculation Phenomena of Non-Ionic Surface-Active Agents on Silver Iodide Sols
An explanation concerning the flocculation and stabilization
action of non-ionic surface-active agents (NSAA) T-X-305 and
T-X-705 on the negatively and positively charged silver iodide
stable sols was attempted by means of tyndallometric and microscopic
investigations.
The flocculation phenomena were found to occur in the concentrational
region of 10-7 to 10-4 mol dm·3 of triton. The influence
of temperature, time, and sol concentration on the kinetics of the
formation of colloid particles was also examined . The mechanism
of flocculation· processes was suggested by assuming that the flocculation
and stabilization of Ag! colloid in the presence of NSAA
is a heterogeneous precipitation characterized by the critical concentrational
and temporal parameters
Precipitation of Tannic Acid with Triton T-X-705
Precipitation phenomena in aqueous solutions of the non-ionic
surface-active agent Triton T-X-705 and tannic acid were examinated
by the light scattering method at 293 K. The shape of the precipitation
diagram, as well as the micellization effects, indicate
the formation of mainly associates-aquacomplexes, which can be
due to the mutual interaction of two macromolecules. There is
no formation of an ionic compound
The Retail FX Trader: Random Trading and the Negative Sum Game
With the internet boom of early 2000 making access to trading the Foreign Exchange (FX) market far simpler for members of the general public, the growth of 'retail' FX trading continues, with daily transaction volumes as high as $200 billion. Potential new entrants to the retail FX trading world may come from the recent UK pension deregulations, further increasing the volumes. The attraction of FX trading is that it offers high returns and whilst it has been understood that it is high-risk in nature, the rewards are seen as being commensurately high for the 'skilled and knowledgeable' trader who has an edge over other market participants. This paper analyses a number of independent sources of data and previous research, to examine the profitability of the Retail FX trader and compares the results with that of a simulated random trading models. This paper finds evidence to suggest that whilst approximately 20% of traders can expect to end up with a profitable account, around 40% might expect their account to be subject to a margin call. This paper finds a strong correlation between the overall profitability of traders and impact of the cost of the bid-ask spread, whilst finding little if any evidence that retail FX traders, when viewed as a group, are achieving results better than that from random trading
HIV-care access among people with incarceration experience in St. Petersburg, Russia
Background: Little is known about the clinical care experiences of HIV-infected persons in St. Petersburg who have experience with incarceration. To address this question, we conducted a capture-recapture study to identify individuals who had been diagnosed with HIV infection while incarcerated and who subsequently presented for medical care in St. Petersburg, Russia following release from prison.
Methods: We matched 292 HIV-positive prisoners tested by the prison system in 2010 to the medical records at the St. Petersburg AIDS Center in the following 4 years.
Results: The data analysis shows that as many as half of HIV+ prisoners fail to seek treatment in the community upon release. Of those who had sought care post-release, only 36% were receiving HAART. Of the 109 individuals for whom tuberculosis testing was indicated post-release, 36.7% were found to be reactive.
Conclusion: Despite the limitations of the data, this study is the first of its kind to review records documenting HIV care among prisoners in Russia post-incarceration. In addition to providing important descriptive information about this marginalized population, the findings from this study highlight areas where HIV control efforts could be improved in order to address the HIV epidemic in the Russian Federation
A qualitative study of overdose responses among Chicago IDUs
This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens
Fiber-Flux Diffusion Density for White Matter Tracts Analysis: Application to Mild Anomalies Localization in Contact Sports Players
We present the concept of fiber-flux density for locally quantifying white
matter (WM) fiber bundles. By combining scalar diffusivity measures (e.g.,
fractional anisotropy) with fiber-flux measurements, we define new local
descriptors called Fiber-Flux Diffusion Density (FFDD) vectors. Applying each
descriptor throughout fiber bundles allows along-tract coupling of a specific
diffusion measure with geometrical properties, such as fiber orientation and
coherence. A key step in the proposed framework is the construction of an FFDD
dissimilarity measure for sub-voxel alignment of fiber bundles, based on the
fast marching method (FMM). The obtained aligned WM tract-profiles enable
meaningful inter-subject comparisons and group-wise statistical analysis. We
demonstrate our method using two different datasets of contact sports players.
Along-tract pairwise comparison as well as group-wise analysis, with respect to
non-player healthy controls, reveal significant and spatially-consistent FFDD
anomalies. Comparing our method with along-tract FA analysis shows improved
sensitivity to subtle structural anomalies in football players over standard FA
measurements
Alpha B-crystallin protects retinal tissue during Staphylococcus aureus-induced endophthalmitis
Bacterial infections of the eye highlight a dilemma that is central to all immune-privileged sites. On the one hand, immune privilege limits inflammation to prevent bystander destruction of normal tissue and loss of vision. On the other hand, bacterial infections require a robust inflammatory response for rapid clearance of the pathogen. We demonstrate that the retina handles this dilemma, in part, by activation of a protective heat shock protein. During Staphylococcus aureus-induced endophthalmitis, the small heat shock protein αB-crystallin is upregulated in the retina and prevents apoptosis during immune clearance of the bacteria. In the absence of αB-crystallin, mice display increased retinal apoptosis and retinal damage. We found that S. aureus produces a protease capable of cleaving αB-crystallin to a form that coincides with increased retinal apoptosis and tissue destruction. We conclude that αB-crystallin is important in protecting sensitive retinal tissue during destructive inflammation that occurs during bacterial endophthalmitis
Resistance of Dictyostelium discoideum membranes to saponin permeabilization
<p>Abstract</p> <p>Background</p> <p>Saponin is a mild detergent commonly used to permeabilize cells prior to immunofluorescence labeling of intracellular proteins. It has previously been used to that effect in <it>Dictyostelium discoideum </it>amoebae.</p> <p>Findings</p> <p>We show that saponin, contrary to Triton X-100 or alcohol, permeabilizes at best incompletely membranes of <it>Dictyostelium</it>. In cells exposed to osmotic stress, almost complete resistance to saponin permeabilization was observed.</p> <p>Conclusions</p> <p>Saponin should be used with special care to permeabilize <it>Dictyostelium </it>membranes. This unsusual property is presumably linked to the specific sterol composition of <it>Dictyostelium </it>membranes. It may also represent an adaptation of <it>Dictyostelium </it>to harsh conditions or to natural compounds encountered in its natural environment.</p
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