1,017 research outputs found
Spike voltage topography in temporal lobe epilepsy
We investigated the voltage topography of interictal spikes in patients with temporal lobe epilepsy (TLE) to see whether topography was related to etiology for TLE. Adults with TLE, who had epilepsy surgery for drug-resistant seizures from 2011 until 2014 at Jefferson Comprehensive Epilepsy Center were selected. Two groups of patients were studied: patients with mesial temporal sclerosis (MTS) on MRI and those with other MRI findings. The voltage topography maps of the interictal spikes at the peak were created using BESA software. We classified the interictal spikes as polar, basal, lateral, or others. Thirty-four patients were studied, from which the characteristics of 340 spikes were investigated. The most common type of spike orientation was others (186 spikes; 54.7%), followed by lateral (146; 42.9%), polar (5; 1.5%), and basal (3; 0.9%). Characteristics of the voltage topography maps of the spikes between the two groups of patients were somewhat different. Five spikes in patients with MTS had polar orientation, but none of the spikes in patients with other MRI findings had polar orientation (odds ratio = 6.98, 95% confidence interval = 0.38 to 127.38; p = 0.07). Scalp topographic mapping of interictal spikes has the potential to offer different information than visual inspection alone. The present results do not allow an immediate clinical application of our findings; however, detecting a polar spike in a patient with TLE may increase the possibility of mesial temporal sclerosis as the underlying etiology
Этиопатогенетические аспекты терапии хронических воспалительных заболеваний органов малого таза
Наведено сучасні принципи лікування запальних захворювань жіночих статевих органів з урахуванням
етіопатогенезу запалення й особливостей продукції у цервікальному слизу запальних і протизапальних
цитокинів. Показано, що включення до комплексу терапії інтерферонів сприяє відновленню порушеного
імунологічного гомеостазу й зниженню ймовірності рецидивів захворювання.Modern principles of treatment of inflammatory diseases of female genitals taking into account an
etiopathogenesis of an inflammation and features of production in сervical mucous inflammatory and antiinflammatory
cytokines are resulted. Including in a complex of therapy of interferons is shown, that, promotes restoration of the
broken immunologic homeostasis and depression of probability of relapses of disease
Mass Spectrometry in Weakly Ionized Plasmas Using a Gifford-McMahon Cryocooled Superconducting Magnet
Frictional melting of peridotite and seismic slip
The evolution of the frictional strength along a fault at seismic slip rates (about 1 m/s) is
a key factor controlling earthquake mechanics. At mantle depths, friction-induced melting
and melt lubrication may influence earthquake slip and seismological data. We report on
laboratory experiments designed to investigate dynamic fault strength and frictional melting
processes in mantle rocks. We performed 20 experiments with Balmuccia peridotite in a
high-velocity rotary shear apparatus and cylindrical samples (21.8 mm in diameter) over a
wide range of normal stresses (5.4–16.1 MPa), slip rates (0.23–1.14 m/s), and displacements
(1.5–71 m). During the experiments, shear stress evolved with cumulative displacement in
five main stages (stages 1–5). In stage 1 (first strengthening), the coefficient of friction m
increased up to 0.4–0.7 (first peak in friction). In stage 2 (abrupt firstweakening), m decreased
to about 0.25–0.40. In stage 3 (gradual second strengthening), shear stress increased toward
a second peak in friction (m = 0.30–0.40). In stage 4 (gradual second weakening), the
shear stress decreased toward a steady state value (stage 5) with m = 0.15. Stages 1 and 2 are
of too short duration to be investigated in detail with the current experimental configuration.
By interrupting the experiments during stages 3, 4, and 5, microstructural (Field Emission
Scanning Electron Microscope) and geochemical (Electron Probe Micro-Analyzer and
Energy Dispersive X-Ray Spectroscopy) analysis of the slipping zone suggest that second
strengthening (stage 3) is associated with the production of a grain-supported melt-poor
layer, while second weakening (stage 4) and steady state (stage 5) are associated with the
formation of a continuous melt-rich layer with an estimated temperature up to 1780 C.
Microstructures formed during the experiments were very similar to those found in natural
ultramafic pseudotachylytes. By performing experiments at different normal stresses
and slip rates, (1) the ‘‘thermal’’ (as it includes the thermally activated first and second
weakening) slip distance to achieve steady state from the first peak in strength decreased
with increasing normal stress and slip rate and (2) the steady state shear stress slightly
increased with increasing normal stress and, for a given normal stress, decreased with
increasing slip rate. The ratio of shear stress versus normal stress was about 0.15, well below
the typical friction coefficient of rocks (0.6–0.8). The dependence of steady state shear stress
with normal stress was described by means of a constitutive equation for melt lubrication.
The presence of microstructures similar to those found in natural pseudotachylytes and the
determination of a constitutive equation that describes the experimental data allows
extrapolation of the experimental observations to natural conditions and to the study of
rupture dynamics in mantle rocks
High-velocity frictional properties of Alpine Fault rocks: Mechanical data, microstructural analysis, and implications for rupture propagation
Analysis of strain and stacking faults in single nanowires using Bragg coherent diffraction imaging
Coherent diffraction imaging (CDI) on Bragg reflections is a promising
technique for the study of three-dimensional (3D) composition and strain fields
in nanostructures, which can be recovered directly from the coherent
diffraction data recorded on single objects. In this article we report results
obtained for single homogeneous and heterogeneous nanowires with a diameter
smaller than 100 nm, for which we used CDI to retrieve information about
deformation and faults existing in these wires. The article also discusses the
influence of stacking faults, which can create artefacts during the
reconstruction of the nanowire shape and deformation.Comment: 18 pages, 6 figures Submitted to New Journal of Physic
Strong and stable photoluminescence from the semiconducting inner tubes within double walled carbon nanotubes
This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in APPLIED PHYSICS LETTERS. 94(8):083106 (2009) and may be found at https://doi.org/10.1063/1.3085966 .ArticleAPPLIED PHYSICS LETTERS. 94(8):083106 (2009)journal articl
T2 relaxation times of the retrodiscal tissue in patients with temporomandibular joint disorders and in healthy volunteers: A comparative study
Objective. The aims of this study were to compare the temporomandibular joint (TMJ) retrodiscal tissue T2 relaxation times between patients with temporomandibular disorders (TMDs) and asymptomatic volunteers and to assess the diagnostic potential of this approach. Study Design. Patients with TMD (n = 173) and asymptomatic volunteers (n = 17) were examined by using a 1.5-T magnetic resonance scanner. The imaging protocol consisted of oblique sagittal, T2-weighted, 8-echo fast spin echo sequences in the closed mouth position. Retrodiscal tissue T2 relaxation times were obtained. Additionally, disc location and reduction, disc configuration, joint effusion, osteoarthritis, and bone edema or osteonecrosis were classified using MRI scans. The T2 relaxation times of each group were statistically compared. Results. Retrodiscal tissue T2 relaxation times were significantly longer in patient groups than in asymptomatic volunteers (P < .01). T2 relaxation times were significantly longer in all of the morphologic categories. The most important variables affecting retrodiscal tissue T2 relaxation times were disc configuration, joint effusion, and osteoarthritis. Conclusion. Retrodiscal tissue T2 relaxation times of patients with TMD were significantly longer than those of healthy volunteers. This finding may lead to the development of a diagnostic marker to aid in the early detection of TMDs
Anéis e ritmo de crescimento de espécies arbóreas em áreas da Mata Atlântica, no Estado do Paraná.
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