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Search Results: 1 - 10 of 32 matches for " Wadih Tamari "
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Pain-related somatosensory evoked potentials and functional brain magnetic resonance in the evaluation of neurologic recovery after cardiac arrest: a case study of three patients
Paolo Zanatta, Simone Messerotti Benvenuti, Fabrizio Baldanzi, Matteo Bendini, Marsilio Saccavini, Wadih Tamari, Daniela Palomba, Enrico Bosco
Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine , 2012, DOI: 10.1186/1757-7241-20-22
Abstract: Early and accurate prognostic assessment of neurological functional outcomes in comatose patients after cardiac arrest is a relevant medical, ethical, and economic issue. It has been shown that beyond the Glasgow Coma Scale (GCS), a patient's pupil light reactivity, corneal reflexes, myoclonus status epilepticus, and serum neuron-specific enolase, short latency somatosensory-evoked potentials (SEPs) (N20/P25) improve the accuracy of neurological prognosis in comatose patients after cardiac arrest [1]. SEPs have shown high sensitivity and specificity in predicting poor outcomes. Indeed, that the bilateral disappearance of cortical N20/P25 is well-established to be associated with adverse outcomes such as death or survival in a vegetative state. Nonetheless, the presence of N20/P25 may not be sensitive enough to predict a good neurological outcome [2]. In fact, only the event-related evoked potentials (i.e., mismatched negativity and novelty P300), middle latency cortical somatosensory-evoked potentials (MLCEPs), and reactivity electroencephalogram (EEG) background have been associated with a favourable neurological prognosis [3-7].In recent years, brain functional neuroimaging has been used in order to clarify the diagnosis of the vegetative state, suggesting that brain activation imaging may reflect awareness and/or cognition and provide reliable prognostic information [8,9]. However, given that this methodology is based on imagery and communication task paradigms, this approach is only feasible in the chronic phase of consciousness disorders. Moreover, studies using positron emission tomography have shown that minimally conscious state patients, compared to vegetative state patients, may show brain processing activation elicited by noxious electrical stimulation of the median nerves similar to that seen in healthy controls, suggesting a possible cortical processing of pain [10-12]. However, the intensity of electrical stimuli applied in vegetative patients (i.e., 1
Accelerated observers and gravitational radiation
Jose Wadih Maluf
Physics , 2004,
Abstract: We evaluate the energy-momentum of the gravitational field of a Schwarzschild black hole of mass M in the frame of a moving observer that asymptotically undergoes a Lorentz boost. The analysis is carried out in the framework of the teleparallel equivalent of general relativity (TEGR). We find that the total expression for the energy-momentum of the gravitational field is similar to the usual relativistic expression for the energy-momentum four-vector of a particle of inertial mass M under a Lorentz boost in flat space-time. Moreover we conclude that if the observer accelerates with respect to the black hole he will experience gravitational energy radiation, in similarity to the expected radiation of an accelerated charged particle in electrodynamics. We show that the increase of the mass of the black hole by the usual factor gamma as observed in the moving frame, which is a typical feature of special relativity if the black hole is considered asymptotically as a body of mass M, is due to gravitational radiation.
United Dipole Field
V. F. Tamari
Physics , 2003,
Abstract: The field of an electromagnetic (E) dipole has been examined using general relativistic (R) and quantum mechanical (Q) points of view, and an E=Q=R equivalence principle presented whereas the curvature of the electromagnetic streamlines of the field are taken to be evidence of the distortion of spacetime, and hence of the presence of a gravitational field surrounding the dipole. Using a quasi-refractive index function N, with the streamlines and equipotential surfaces as coordinates, a new dipole relativistic metric is described, replacing Schwarzschild's for a point mass. The same principle equates the curvature and other physical features of the field with fundamental quantum concepts such as the uncertainty principle, the probability distribution and the wave packet. The equations of the dipole field therefore yield the three fields emerging naturally one from the other and unified without resorting to any new dimensions. It is speculated whether this model can be extended to dipolar matter-antimatter pairs.
Diffraction to De-Diffraction
V. F. Tamari
Physics , 2003,
Abstract: De-diffraction (DD), a new procedure to totally cancel diffraction effects from wave-fields is presented, whereby the full field from an aperture is utilized and a truncated geometrical field is obtained, allowing infinitely sharp focusing and non-diverging beams. This is done by reversing a diffracted wave-fields' direction. The method is derived from the wave equation and demonstrated in the case of Kirchhoff's integral. An elementary bow-wavelet is described and the DD process is related to quantum and relativity theories.
Possible Application of the Medicinal Plant Hyoscyamus albus in Phytoremediation: Excess Copper Compensates for Iron Deficiency, Depending on the Light Conditions  [PDF]
Noriko Tamari, Akemi Mine, Ari Sako, Seiya Tamagawa, Yasuhiro Tabira, Yoshie Kitamura
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.526399
Abstract: Seedlings of the medicinal plant Hyoscyamus albus were supplied with an excess of Cu to examine the possible application in phytoremediation. The seedlings were cultured in B5 medium supplied with basal 0.1 μM Cu and 200 μM Cu under various light conditions: short day (SD); long day (LD); and continuous light (CL). In addition, the effect of supplying 200 μM Cu under Fe deficiency was determined, in order to elucidate the interaction between Cu and Fe. Interestingly, Fe-deficiency symptoms that developed in plants grown with basic levels of Cu under LD almost disappeared when excess Cu was supplied. Plant growth mainly depended on the photo irradiation period (SD < LD~CL); and 200 μM Cu did not inhibit growth at all when Fe was available, whereas in the absence of Fe, CL caused damage to growth. Analysis of the Cu and Fe contents of the plants revealed that Cu was distributed equally in both the aerial parts and roots, whereas most of the Fe was found in the roots; under Fe deficiency, Cu accumulation in the roots apparently increased. Cu was mainly distributed in the soluble fraction, which included vacuoles and the cell-wall fraction. These results provide evidence indicating that H. albus seedlings are tolerant of Cu present in excess. Furthermore, excess Cu was able to compensate for Fe deficiency, depending on the light conditions. Continuous light inhibited this effect, probably as a result of the induction of Mn deficiency. The possible applications of this newly discovered cuprophyte are discussed.
Manifestations the hidden symmetry of Coulomb problem in the relativistic quantum mechanics - from Pauli to Dirac electron
Tamari T. Khachidze,Anzor A. Khelashvili
Physics , 2005,
Abstract: The theorem known from Pauli equation about operators that anticommute with Dirac's $K$-operator is generalized to the Dirac equation. By means of this theorem the operator is constructed which governs the hidden symmetry in relativistic Coulomb problem (Dirac equation). It is proved that this operator coincides with the familiar Johnson-Lippmann one and is intimately connected to the famous Laplace-Runge-Lenz (LRL) vector. Our derivation is very simple and informative. It does not require a longtime and tedious calculations, as is offten underlined in most papers.
Teaching the hidden symmetry of the Kepler problem in relativistic quantum mechanics - from Pauli to Dirac electron
Tamari T. Khachidze,Anzor A. Khelashvili
Physics , 2005, DOI: 10.1119/1.2178846
Abstract: Hidden symmetry in Coulomb interaction is one of the mysterious problems of modern physics. Additional conserved quantities associated with extra symmetry govern wide variety of physics problems, from planetary motion till fine and hyperfine structures of atomic spectra. In this paper we present a simple derivation of hidden symmetry operator in relativistic quantum mechanics for the Dirac equation in the Coulomb field. We established that this operator may be reduced to the one introduced by Johnson and Lippmann. It is worthwhile to notice that this operator was discussed in literature very rarely and so is not known well among physicists and was omitted even in the recent textbooks on relativistic quantum mechanics and/or quantum electrodynamics.
Coordination of Gene Expression and Growth-Rate in Natural Populations of Budding Yeast
Zvi Tamari, Dalia Rosin, Yoav Voichek, Naama Barkai
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088801
Abstract: Cells adapt to environmental changes through genetic mutations that stabilize novel phenotypes. Often, this adaptation involves regulatory changes which modulate gene expression. In the budding yeast, ribosomal-related gene expression correlates with cell growth rate across different environments. To examine whether the same relationship between gene expression and growth rate is observed also across natural populations, we measured gene expression, growth rate and ethanol production of twenty-four wild type yeast strains originating from diverse habitats, grown on the pentose sugar xylulose. We found that expression of ribosome-related genes did not correlate with growth rate. Rather, growth rate was correlated with the expression of amino acid biosynthesis genes. Searching other databases, we observed a similar correlation between growth rate and amino-acid biosyntehsis genes in a library of gene deletions. We discuss the implications of our results for understanding how cells coordinate their translation capacity with available nutrient resources.
Characterization of Cu(II)-ACC Complexes and Conversion of the Bound ACC into Ethylene in the Presence of Hydrogen Peroxide. Detection of a Brown Intermediate at Low Temperature
Wadih Ghattas,Michel Giorgi,Christian Gaudin,Antal Rockenbauer,Marius Réglier,A. Jalila Simaan
Bioinorganic Chemistry and Applications , 2007, DOI: 10.1155/2007/43424
Abstract: Two copper(II)-ACC complexes were prepared and characterized: [Cu(bpy)(ACC)(H2O)]⋅CO4 (1) and [Cu(ACC)2]3⋅4H2O (2). Their crystallographic structures are described and analyzed. Spectroscopic characterizations (UV-visible and EPR) confirm that the structure is maintained in solution. These complexes are able to produce ethylene in the presence of hydrogen peroxide in an “ACC Oxidase-like” reaction in water and in methanol. The conversion of ACC into ethylene depends on the amount of base, and, in methanol, 3 equivalents of NaOH are needed for optimum activity. The base is proposed to play a role in H2O2 deprotonation. The presence of an exogenic ligand (bpy) is important for the reactivity and may stabilize a reaction intermediate. Indeed, a brown intermediate with an absorption band centered at 433 nm can be detected at low temperature when 1 is treated with 10 equivalents of H2O2.
Factores de riesgo que afectan la fusión en el tratamiento de la inestabilidad en la columna lumbar
ávila, José María Jiménez;Valencia, Jorge García;Alatorre, Wadih Emilio Bitar;
Coluna/Columna , 2010, DOI: 10.1590/S1808-18512010000300010
Abstract: objective: to describe the risk factors that affect the vertebral fusion in the lumbar spine instability, in patients attended in our hospital that are related to nutritional aspects. methods: a total of 59 patients were reviewed of whom 15 (25.4%) were cases (pseudoartrosis), and 44 (74.6%) were controls (fusion). the population distribution presented patients, of which 27 (45.8%) were female and 32 (54.2%), male. the average age was 51 with a 12 standard deviation, a minimum of 20 and a maximum of 85 years old. distribution by diagnosis was 29 (49.1%) spondylolisthesis, 21 (35.6%) fractures, 5 (8.5%) herniations, 3 (5.1%) infections, and 1 (1.7%) tumor. the average weight was 75.9 kg, with 1.60 cm height, bmi of 24.5, a hb of 15.2, hto of 35.9, and 3.5 albumin. results: several risk factors were analyzed between ages higher than 60 years, it showed a 49% more likely to a pseudoartrosis in comparison with the control group with a 95% ci=0.12-2.27. more than 90 kg of weight showed 82% more likely to a pseudoartrosis in comparison with the fusion group, having as a 95% ci=0.03-0.43, the bmi shows 25% more likely to a pseudoartrosis with a 95% ci=0.18-3.18, hypoalbuminemia less than 3.4 mg/100 ml showed a 78% more likely to the pseudoartrosis (95% ci=0.06-0.75). conclusions: the pseudoartrosis is caused by risk factors associated with the nutrient profile, like the obesity itself, the hypoalbuminemia and there is a probability to present 1.5 times more than the values of ordinary people. thus, it is important that these values are evaluated and fixed before in the pre-surgical with support measures that allows adequate metabolic and, consequently, an optimal outcome, such as fusion. evidence level: study case-control with a level iii of evidence.
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