Search results for " matrices"

Evaluation of efficacy and biocompatibility of a novel semisynthetic collagen matrix as a dural onlay graft in a large animal model

2011

Background Semisynthetic collagen matrices are promising duraplasty grafts with low risk of cerebrospinal fluid (CSF) fistulas, good tissue integration and minor foreign body reaction. The present study investigates the efficacy and biocompatibility of a novel semisynthetic bilayered collagen matrix (BCM, B. Braun Aesculap) as dural onlay graft for duraplasty. Methods Thirty-four pigs underwent osteoclastic trepanation, excision of the dura, and placement of a cortical defect, followed by duraplasty using BCM, Suturable DuraGen™ (Integra Neuroscience), or periosteum. CSF tightness and intraoperative handling of the grafts were evaluated. Pigs were sacrificed after 1 and 6 months for histolo…

Cognitive impairment in patients suffering from relapsing-remitting multiple sclerosis with EDSS ≤ 3.5

2003

Objectives – Previous papers have mainly demonstrated the presence and the frequency of cognitive impairment in patients suffering from relapsing-remitting multiple sclerosis. The purpose of this study was to investigate subjects with the relapsing-remitting form of the disease and mild clinical disability (EDSS ≤ 3.5), so as to quantify this deficit when the illness does not yet interfere with daily living and the ability to work. Methods – Fifty patients and 50 healthy controls were submitted to a wide neuropsychological battery, including Wechsler Memory Scale – I- (WMS), Benton Visual Retention Test – D- (BVRT), Raven Coloured Progressive Matrices (RCPM), Kohs’ test (KT), Judgement of L…

Systematic review and meta-analysis found that malnutrition was associated with poor cognitive development

2021

Aim: Malnutrition is a major public health issue that has been associated with high susceptibility for impaired brain development and mental functioning. However, to date studies on this topic have not been collated and appraised. This systematic review and meta-analysis investigated the association between malnutrition and cognitive development. Methods: We searched the MEDLINE, Scopus, CINAHL, Embase PsycINFO and Cochrane Library databases in English up to 8 December 2020. All studies reporting an association between nutritional status and cognitive development were included. p values of less than 0.05 were considered statistically significant and the results are reported as standardised …

Metathese et homonymie en hebreu biblique

2009

La théorie des matrices et des étymons (Bohas, 1997, 2000) permet de rendre compte d’une organisation formelle et conceptuelle du lexique de l’arabe fondée sur deux aspects essentiels: l’un concerne l’identification du lien lexicologique entre les mots (i. e. présence simultanée d’un invariant formel et d’une ressemblance conceptuelle); le deuxième vise le rapport existant entre ces mots et le monde (i. e. présence d’une charge mimophonique qui suggère, par les séquences articulatoires des mots, certains aspects de la réalité à désigner). Ce modèle s’avère particulièrement intéressant pour d’autres systèmes linguistiques, en l’occurrence, l’hébreu biblique (Dat 2002), car il est à même d’or…

O analogiji i teoriji etimona u hebrejskome biblijskom leksiku

2012

Dans le débat sur l’iconicité du langage, l’une des questions qui se posent d’une manière récurrente est de savoir si les formations onomatopéiques représentent un principe primitif de formation des mots, si dans les premières formes du langage humain tous les signes ont été du type craquer, murmurer, etc., dont la plupart auraient ensuite perdu leur charge mimophonique. Saussure s’est prononcé contre toute théorie positive de la signification dans le domaine des sciences du langage, position qui a constitué pour longtemps une norme de travail en linguistique. Cet article traite des icônes auditives dans le lexique hébraïque de la Bible dont l’analogie phonation–référent est rendue manifest…

DETERMINATION OF ABUSED SUBSTANCES IN BIOLOGICAL MATRICES FOR TOXICOLOGICAL AND FORENSIC PURPOSES

2019

During the year 2017, a research work was carried out at the Department of laboratory diagnostics - Toxicology and Biochemistry U.O.S. of ASP 6 in Palermo. The purpose of this investigation was to perform a second level analysis in order to look for abuse drugs. The sample used consisted of 73 serum tubes, which had previously tested positive for screen- ing tests. The result of the analysis of these samples revealed a false positivity in most cases. From the information gathered through the sampling reports, it appears that the age group with several drivers, who are subject to checks by the traffic police, is the one from 17 to 30 years, with 35 samples analysed (48%). It also emerged tha…

Higher order matrix differential equations with singular coefficient matrices

2014

In this article, the class of higher order linear matrix differential equations with constant coefficient matrices and stochastic process terms is studied. The coefficient of the highest order is considered to be singular; thus, rendering the response determination of such systems in a straightforward manner a difficult task. In this regard, the notion of the generalized inverse of a singular matrix is used for determining response statistics. Further, an application relevant to engineering dynamics problems is included.

Jacobi Fields, Conjugate Points

2001

Let us go back to the action principle as realized by Jacobi, i.e., time is eliminated, so we are dealing with the space trajectory of a particle. In particular, we want to investigate the conditions under which a path is a minimum of the action and those under which it is merely an extremum. For illustrative purposes we consider a particle in two-dimensional real space.

Water effects on saccharide matrices studied with molecular dynamics

2013

Flexible and Efficient Computer-Aided Design Tool for Advanced Comb-Line Rectangular Waveguide Filters

2015

A very flexible and efficient computer-aided design (CAD) tool, specifically suited for advanced comb-line rectangular waveguide filters, is presented in this work. The developed software tool, which makes use of a full-wave analysis technique based on the Boundary Integral - Resonant Mode Expansion method, permits to load the considered comb-line resonators with any number of radially symmetrical partial-height metallic posts. The implemented CAD tool also allows for dealing with coupling windows of arbitrary cross-section, thus drastically enhancing the flexibility of the computer-aided design process. The excitation of the analyzed components, which is performed by using generalized coax…