136 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
Expressing a General Form as a Sum of Determinants
Let A= (a_{ij}) be a non-negative integer k x k matrix. A is a homogeneous
matrix if a_{ij} + a_{kl}=a_{il} + a_{kj} for any choice of the four indexes.
We ask: If A is a homogeneous matrix and if F is a form in C[x_1, \dots x_n]
with deg(F) = trace(A), what is the least integer, s(A), so that F = det M_1 +
... + det M_{s(A)}, where the M_i's are k x k matrices of forms with degree
matrix A? We consider this problem for n>3 and we prove that s(A) is at most
k^{n-3} and s(A) <k^{n-3} in infinitely many cases. However s(A) = k^{n-3} when
the entries of A are large with respect to k
Plasmonic Optical Tweezers based on Nanostructures: fundamentals, advances and prospects
The ability of metallic nanostructures to confine light at the sub-wavelength
scale enables new perspectives and opportunities in the field of
nanotechnology. Making use of this unique advantage, nano-optical trapping
techniques have been developed to tackle new challenges in a wide range of
areas from biology to quantum optics. In this work, starting from basic
theories, we present a review of research progress in near-field optical
manipulation techniques based on metallic nanostructures, with an emphasis on
some of the most promising advances in molecular technology, such as the
precise control of single-biomolecules. We also provide an overview of possible
future research directions of nano-manipulation techniques.Comment: 19 page
Calcaneus fracture
This issue of eMedRef provides information to clinicians on the pathophysiology, diagnosis, and therapeutics of calcaneus fractures
An accurate calculation of the nucleon axial charge with lattice QCD
We report on a lattice QCD calculation of the nucleon axial charge, ,
using M\"{o}bius Domain-Wall fermions solved on the dynamical HISQ
ensembles after they are smeared using the gradient-flow algorithm. The
calculation is performed with three pion masses,
MeV. Three lattice spacings ( fm) are used with the
heaviest pion mass, while the coarsest two spacings are used on the middle pion
mass and only the coarsest spacing is used with the near physical pion mass. On
the MeV, fm point, a dedicated volume study is
performed with . Using a new strategy
motivated by the Feynman-Hellmann Theorem, we achieve a precise determination
of with relatively low statistics, and demonstrable control over the
excited state, continuum, infinite volume and chiral extrapolation systematic
uncertainties, the latter of which remains the dominant uncertainty. Our final
determination at 2.6\% total uncertainty is , with the
first uncertainty including statistical and systematic uncertainties from
fitting and the second including model selection systematics related to the
chiral and continuum extrapolation. The largest reduction of the second
uncertainty will come from a greater number of pion mass points as well as more
precise lattice QCD results near the physical pion mass.Comment: 17 pages + 11 pages of references and appendices. 15 figures.
Interested readers can download the Python analysis scripts and an hdf5 data
file at https://github.com/callat-qcd/project_gA_v
Calcaneal fractures: an audit of radiological outcome.
Abstract OBJECTIVE:
To assess radiological outcome of management of calcaneal fractures. METHODS:
The retrospective study was conducted at Aga Khan University Hospital, Karachi, and comprised data of calcanealfractures managed between February , 2008 and February, 2014 Cases were identified through medical records, and X-rays were reviewed through digital radiology archive. Bohler\\u27s angle, Gissane\\u27s angle, calcaneal height and width were assessed digitally on pre-operative and post-operative X-ray images. RESULTS:
Of the27 patients, only 1(3.7%) was female. The cause of fracture was fall from height 15(56%), road traffic accidents 7(26%) and bomb blasts5(19%). Tongue type fractures were 16(59%) and 11(41%) were joint depression type. There was a significant mean increase in Bohler\\u27s angle (p0.05 each). CONCLUSIONS:
Measurable improvement in anatomical parameters is possible with surgery, which is a prerequisite for good functional results
Co-processing of the arrowroot-chitosan by spray drying
Starch is one of the most widely used excipient in the manufacture of solid dosage forms. One of few problems associated with starch is its poor flowability so can’t used as excipient in direct compression tablet. The purpose of these studies was to develop of the arrowroot starch for use as excipient in direct compression tablet. The arrowroot starch was co-processing with chitosan by spray drying. The suspension of arrowroot starch-chitosan for feed in spray drying were prepared with three different ratios (1:1, 2:1 and 3:1). The product of co-processing were evaluated for morphology, moisture content, viscosity, angle of repose, flow rate of granules, bulk density, tapped density and Carr’s index. Results showed that co-process excipient of arrowroot starch-chitosan have spherical in shape, moisture content in the range of 4.70–5.10 % w/w, viscosity in the range of 1.77-2.17 mPas, angle of repose was found to be < 380, flow rate of granules in the range of 1,5 – 4,0 g/s, bulk density in the range of 0.47-0.59 g/mL, tapped density in the range of 0.59–0.79 g/mL l and Carr’s index in the range of 19.03-25.08 %.Key words: arrowroot starch, co-process excipient, direct compressio
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