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Search Results: 1 - 10 of 14825 matches for " Christian Mitri "
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Rock Breakage Using Expansive Cement  [PDF]
Amr El Dessouki, Hani Mitri
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.32020
Abstract: Expansive cements are powdery materials which produce expansive stresses during the moist curing process. These cements are classified as shrinkage-compensated or self-stressing cements. The shrinkage compensated is used in the construction industry and will not be investigated in this paper. Self-Stressing cement is widely used in the demolition & fragmentation industry and will be the main focus of this report. The objective of this paper is to discuss the relationship between Sulfate-compounds on the expansion time and degree of expansion of Betonamit expansive cement. Based on literature [1], expansion time is directly proportional to sulfate content when mixed with Portland cement. Hence, as the sulfate content of the cement mixture increases, expansion time increases. However, in this research project the effect of Portland cement was removed to further examine the effect of sulfate on Betonamit only. This phenomenon was investigated using various concentrations of 4 different Sulfate-compounds. The results proved the possibility of decreasing the expansion time of Betonamit and, quite remarkably, a much greater degree of expansion was obtained.
Plant Insecticide L-Canavanine Repels Drosophila via the Insect Orphan GPCR DmX
Christian Mitri,Laurent Soustelle,Bérénice Framery,Jo?l Bockaert,Marie-Laure Parmentier,Yves Grau
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1000147
Abstract: For all animals, the taste sense is crucial to detect and avoid ingesting toxic molecules. Many toxins are synthesized by plants as a defense mechanism against insect predation. One example of such a natural toxic molecule is l-canavanine, a nonprotein amino acid found in the seeds of many legumes. Whether and how insects are informed that some plants contain l-canavanine remains to be elucidated. In insects, the taste sense relies on gustatory receptors forming the gustatory receptor (Gr) family. Gr proteins display highly divergent sequences, suggesting that they could cover the entire range of tastants. However, one cannot exclude the possibility of evolutionarily independent taste receptors. Here, we show that l-canavanine is not only toxic, but is also a repellent for Drosophila. Using a pharmacogenetic approach, we find that flies sense food containing this poison by the DmX receptor. DmXR is an insect orphan G-protein–coupled receptor that has partially diverged in its ligand binding pocket from the metabotropic glutamate receptor family. Blockade of DmXR function with an antagonist lowers the repulsive effect of l-canavanine. In addition, disruption of the DmXR encoding gene, called mangetout (mtt), suppresses the l-canavanine repellent effect. To avoid the ingestion of l-canavanine, DmXR expression is required in bitter-sensitive gustatory receptor neurons, where it triggers the premature retraction of the proboscis, thus leading to the end of food searching. These findings show that the DmX receptor, which does not belong to the Gr family, fulfills a gustatory function necessary to avoid eating a natural toxin.
Anopheles Gambiae PRS1 Modulates Plasmodium Development at Both Midgut and Salivary Gland Steps
Thomas Chertemps,Christian Mitri,Sylvie Perrot,Jean Sautereau,Jean-Claude Jacques,Isabelle Thiery,Catherine Bourgouin,Isabelle Rosinski-Chupin
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011538
Abstract: Invasion of the mosquito salivary glands by Plasmodium is a critical step for malaria transmission. From a SAGE analysis, we previously identified several genes whose expression in salivary glands was regulated coincident with sporozoite invasion of salivary glands. To get insights into the consequences of these salivary gland responses, here we have studied one of the genes, PRS1 (Plasmodium responsive salivary 1), whose expression was upregulated in infected glands, using immunolocalization and functional inactivation approaches.
Osteopetrosis, Hypophosphatemia, and Phosphaturia in a Young Man: A Case Presentation and Differential Diagnosis
Zahi Mitri,Vin Tangpricha
Case Reports in Endocrinology , 2012, DOI: 10.1155/2012/238364
Abstract: We report the case of a 30-year-old African-American male with osteopetrosis and hypophosphatemia, presenting with diffuse myalgias. Laboratory evaluation performed revealed a low serum phosphorus level with urinary phosphate wasting, low calcium, and 25-hydroxyvitamin D concentrations, as well as elevated alkaline phosphatase. Skull and pelvic radiographs revealed high bone density consistent with high bone mass found on bone mineral density reports. PHEX gene mutation analysis was negative. Patient was started on calcium and phosphorus replacement, and he clinically improved. This paper will review the different subtypes of osteopetrosis, and the evaluation of hypophosphatemia.
Equivalence among some neighborhood structures in fuzzy topology
Cosimo De Mitri
International Journal of Mathematics and Mathematical Sciences , 2005, DOI: 10.1155/ijmms.2005.3909
Abstract: We deepen the study of two known neighborhood structures, which here will be called f⋅k-neighborhood structures and f⋅q-neighborhood structures, in the context of Šostak fuzzy topological spaces. In particular, we characterize fuzzy topologies by f⋅k-neighbor-hood structures. Moreover we introduce and discuss the notions of f⋅k-neighborhood prestructure and f⋅m-neighborhood structure in the same context. At last we prove that the three neighborhood structures mentioned above are equivalent.
Osteopetrosis, Hypophosphatemia, and Phosphaturia in a Young Man: A Case Presentation and Differential Diagnosis
Zahi Mitri,Vin Tangpricha
Case Reports in Endocrinology , 2012, DOI: 10.1155/2012/238364
Abstract: We report the case of a 30-year-old African-American male with osteopetrosis and hypophosphatemia, presenting with diffuse myalgias. Laboratory evaluation performed revealed a low serum phosphorus level with urinary phosphate wasting, low calcium, and 25-hydroxyvitamin D concentrations, as well as elevated alkaline phosphatase. Skull and pelvic radiographs revealed high bone density consistent with high bone mass found on bone mineral density reports. PHEX gene mutation analysis was negative. Patient was started on calcium and phosphorus replacement, and he clinically improved. This paper will review the different subtypes of osteopetrosis, and the evaluation of hypophosphatemia. 1. Introduction This manuscript will present the case of a 30-year-old African American male who presented to medical attention with diffuse myalgias and bony pain. The patient was first treated symptomatically for his hip pain which became progressively worse and was associated with hearing loss and visual disturbances. He was referred for further evaluation, when he was found to have a dual diagnosis of osteopetrosis and hypophosphatemia. This article will mainly focus on the diagnostic evaluation and differential for each condition, as well as a potential unifying diagnosis. 2. Presentation of Case A 30-year-old previously healthy gentleman initially presented approximately two years ago prior to our evaluation with right hip pain occurring during military training. He had no history of trauma occurring prior to this event. He was diagnosed with muscle strain and instructed to take pain medications as needed. Two weeks later, he restarted his training, and shortly afterwards developed bilateral hip pain. He also complained of headaches, mild bilateral hearing loss, as well as blurring of vision for which he started wearing glasses. His physical exam was remarkable only for mild frontal bossing and diffuse bony aches. The patient’s height was 150?cm, which falls below the fifth percentile for his age group. Initial labs revealed an elevated parathyroid hormone (PTH) (86?pg/mL (15–65?pg/mL)), low serum calcium at 8.7?mg/dL (9–10.5?mg/dL), ionized calcium was 1.2?mmol/L (1.1–1.4?mmol/L), and nonfasting phosphorous was 2.0?mg/dL (2.4–4.5?mg/dL). Albumin level was mildly elevated at 5.02?g/dL (3.0–5.0?g/dL), total protein was 7.02?g/dL (6.4–8.2?g/dL). He also had mild anemia with a hemoglobin concentration of 20.3?g/dL (13.7–17.5?g/dL). Iron studies, serum protein electrophoresis, and hemoglobin electrophoresis were normal. His pelvic radiographs demonstrated increased bone
Magnetic monopole searches in the cosmic radiation
Ivan De Mitri
Physics , 2002,
Abstract: There has been a big effort in the past twenty years with at least a couple of generations of experiments which searched for supermassive GUT magnetic monopoles in the cosmic radiation. Here a short review of these searches is given, together with a brief description of the theoretical framework and of the detection techniques.
Results of Dark Matter Searches with the MACRO Experiment
Ivan De Mitri
Physics , 2002,
Abstract: The results of dark matter searches with the MACRO experiment are reported. In particular indirect searches for WIMP's and direct searches for supermassive GUT magnetic monopoles are reported together with massive neutrino studies through the measurement of the oscillation induced anomalies in the atmospheric neutrino flux.
Partial wave series expansions in spherical coordinates for the acoustic field of vortex beams generated from a finite circular aperture
F. G. Mitri
Physics , 2014,
Abstract: Stemming from the Rayleigh-Sommerfeld surface integral, the addition theorems for the spherical wave and Legendre functions, and a weighing function describing the behavior of the radial component of the normal velocity at the surface of a finite circular radiating source, partial-wave series expansions are derived for the incident field of acoustic spiraling (vortex) beams in a spherical coordinate system centered on the axis of wave propagation. Examples for vortex beams, comprising \rho-vortex, zeroth-order and higher-order Bessel-Gauss and Bessel, truncated Neumann-Gauss and Hankel-Gauss, Laguerre-Gauss, and other Gaussian-type vortex beams are considered. The mathematical expressions are exact solutions of the Helmholtz equation. The results presented here are particularly useful to accurately evaluate analytically and compute numerically the acoustic scattering and other mechanical effects of finite vortex beams, such as the axial and 3D acoustic radiation force and torque components on a sphere of any (isotropic, anisotropic etc.) material (fluid, elastic, viscoelastic etc.). Numerical predictions allow optimal design of parameters in applications including but not limited to acoustical tweezers, acousto-fluidics, beam-forming design and imaging to name a few.
Partial-Wave Series Expansion and Angular Spectrum Decomposition Formalisms for Acoustical Beams
F. G. Mitri
Physics , 2014,
Abstract: Complex weights factors (CWFs) that fully define the incident beam independent of the presence of a scatterer, may be represented mathematically by either a partial-wave series expansion (PWSE) of multipoles, or the method of angular spectrum decomposition (ASD) of plane waves. Once the mathematical expression for the CWFs of the incident waves is known, evaluation of the arbitrary scattering, radiation force, and torque components on an object in 3D, using the Generalized Theories of Resonance Scattering (GTRS), Radiation Force (GTRF) and Radiation Torque (GTRT), becomes feasible. The aim of this Letter is to establish the connection between these two approaches in the framework of the GTRS, GTRF and GTRT in spherical coordinates for various acoustical applications. The advantage of using the ASD approach is also discussed for specific beams with particular properties.
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