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Search Results: 1 - 10 of 1114 matches for " Najwa Mansour "
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Synergistic Combination of Carbapenems and Colistin against P. aeruginosa and A. baumannii  [PDF]
Ziad Daoud, Najwa Mansour, Khalil Masri
Open Journal of Medical Microbiology (OJMM) , 2013, DOI: 10.4236/ojmm.2013.34038
Abstract: Background: Intubated patients are particularly at risk of developing infections caused by these pathogens, specifically, P. aeruginosa and A. baumannii. In the past fifteen years, Carbapenems were known to be the drugs of choice for these bacteria. With the increase in the use and misuse of antibiotics, these bacteria became highly resistant, and almost all available antibiotics, including Carbapenems, became inefficient. Synergistic combination therapy may be a useful strategy in slowing as well as overcoming the emergence of resistance. The aim of this study was to evaluate the anti-bacterial activity on P. aeruginosa and A. baumannii of the combination of two antibiotics: Colistin and a Carbapenem (Meropenem or Imipenem). Methods: The antibacterial activity was assessed by determining the MIC. Then, the effect of combining the antibiotics was studied using the Checkerboard Technique described by White et al., 1996. The Fractional Inhibitory Concentration (FIC) for each strain was then calculated and classified as synergy, additive, indifference or antagonism. 11 strains of A. baumannii and 11 strains of P. aeruginosa were tested in the presence of Meropenem combined with Colistin or Imipenem combined with Colistin. Results: For the combination of Meropenem and Colistin, 6 strains of A. baumannii and 3 strains of P. aeruginosa showed synergy while 5 strains of A. baumannii and 7 strains of P. aeruginosa showed additive effect, only 1 strain of P. aeruginosa showed antagonism. For Imipenem and Colistin, only 1 strain of A. baumannii and 3 strains of Pseudomonas showed synergy while 8 strains of Acinetobacter and 8 strains of Pseudomonas showed additive effect. Conclusion: The “in vitro” combination Colistin-Carbapenem is associated with an improvement in MIC. In the majority of the cases, this improvement suggests a synergistic combination or an additive effect.
Students’ and Instructors’ Perceptions of Turnitin: A Plagiarism Deterrent?  [PDF]
Najwa Saba Ayon
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.813141
Abstract: Academicians consider plagiarism a major threat to academia. To combat that threat, a lot of universities, including the researcher’s university, have been using Turnitin. It is believed that this software is likely to deter students’ plagiarism. The aim of this study is, therefore, to investigate1) the impact of Turnitin on students’ plagiarism from the perspectives of both students and instructors in a private Lebanese English-speaking university and 2) the reasons that push students to plagiarize. A concurrent mixed-methods design is employed, and different data collection methods are used. The data are analyzed quantitatively and qualitatively. Findings reveal that although a lot of the participants perceive Turnitin as a good deterrent to plagiarism, it did not completely inhibit it. The findings also reveal that not all instructors were committed enough to use Turnitin in their courses. Some of the reasons for plagiarism that the participants named are lack of citation skills, laziness, and indifference among students to abide by ethical writing norms.Besides reinforcing the use of Turnitin among all instructors, the researcher recommends that students’ writing and citation skills be improved and that students be helped to become more ethical writers.
The Bigger Picture: Commentary on a Documentary in the Making.
Najwa Saad.
Nebula , 2005,
Spatial Modeling of Residential Crowding in Alexandria Governorate, Egypt: A Geographically Weighted Regression (GWR) Technique  [PDF]
Shawky Mansour
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.74029
Abstract: Despite growing research for residential crowding effects on housing market and public health perspectives, relatively little attention has been paid to explore and model spatial patterns of residential crowding over space. This paper focuses upon analyzing the spatial relationships between residential crowding and socio-demographic variables in Alexandria neighborhoods, Egypt. Global and local geo-statistical techniques were employed within GIS-based platform to identify spatialvariations of residential crowding determinates. The global ordinary least squares (OLS) modelassumes homogeneity of relationships between response variable and explanatory variablesacross the study area. Consequently, it fails to account for heterogeneity of spatial relationships. Local model known as a geographically weighted regression (GWR) was also employed using the sameresponse variable and explanatory variables to capture spatial non-stationary of residentialcrowding. A comparison of the outputs of both models indicated that OLS explained 74 percent ofresidential crowding variations while GWR model explained 79 percent. The GWR improvedstrength of the model and provided a better goodness of fit than OLS. In addition, the findings of this analysis revealed that residential crowding was significantly associated with different structural measures particularly social characteristics of household such as higher education and illiteracy. Similarly, population size of neighborhood and number of dwelling rooms were found to have direct impacts on residential crowding rate. The spatial relationship of these measures distinctly varies over the study area.
Temperature Effects on the Equation of State and Symmetry Energy: A Critique  [PDF]
Hesham Mansour
Open Journal of Microphysics (OJM) , 2018, DOI: 10.4236/ojm.2018.84004
The investigation of strongly interacting systems ranges from matter inside atomic nuclei to matter under extreme conditions in astrophysics. These systems require the introduction of nuclear forces and a systematic many-body approach to solve the strong interaction particles. Understanding the behavior of infinite nuclear matter provides a path to predict the properties of neutron stars and gives insights to astrophysical phenomena. Three-nucleon forces have to be considered when studying nuclear systems, because their impact is necessary to reproduce properties of nuclei and to correctly obtain the neutron drip line. Moreover, they are needed to predict the empirical saturation properties of infinite nuclear matter. The self-consistent Green’s Function approach paves the way for an improved Ab initio analysis of nuclear matter, thereby providing the basis for the equation of state of neutron stars and supernova explosions.
On the Preon Model  [PDF]
Hesham Mansour
Open Journal of Microphysics (OJM) , 2019, DOI: 10.4236/ojm.2019.92002
One of the fundamental questions is that “what the matter is composed of?” In 1897, atoms are known as the basic building blocks of matter. In the year 1911, Ernest Rutherford demonstrated that when alpha particles are scattered on a thin gold foil that the atom is composed of mostly empty space with a dense core at its center which is called the nucleus. Thereafter, protons and neutrons were discovered. In 1956, McAllister and Hofstadter published experimental results of elastic scattering of the electrons from a hydrogen target which revealed that the proton has an internal structure. In 1964, Gell-Mann (and independently) Zweig proposed that nucleons are composed of point-like particles which are called quarks. These quarks are postulated to have spin-1/2, fractional electric charge. Combinations of different flavors of quarks yield protons and neutrons which belong to the type of particles called baryons (built up from three quarks) and mesons as (quark and an antiquark). These two groups of particles are categorized as hadrons. The quarks showed further decay properties which suggested that they have a substructure.
ContSteg: Contourlet-Based Steganography Method  [PDF]
Hedieh SAJEDI, Mansour JAMZAD
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.13022
Abstract: A category of techniques for secret data communication called steganography hides data in multimedia me-diums. It involves embedding secret data into a cover-medium by means of small perceptible and statistical degradation. In this paper, a new adaptive steganography method based on contourlet transform is presented that provides large embedding capacity. We called the proposed method ContSteg. In contourlet decomposi-tion of an image, edges are represented by the coefficients with large magnitudes. In ContSteg, these coeffi-cients are considered for data embedding because human eyes are less sensitive in edgy and non-smooth re-gions of images. For embedding the secret data, contourlet subbands are divided into 4×4 blocks. Each bit of secret data is hidden by exchanging the value of two coefficients in a block of contourlet coefficients. Ac-cording to the experimental results, the proposed method is capable of providing a larger embedding capacity without causing noticeable distortions of stego-images in comparison with a similar wavelet-based steg-anography approach. The result of examining the proposed method with two of the most powerful steganaly-sis algorithms show that we could successfully embed data in cover-images with the average embedding ca-pacity of 0.05 bits per pixel.
Using Genetic Algorithm for Identification of Diabetic Retinal Exudates in Digital Color Images  [PDF]
Romany Fouad Mansour
Journal of Intelligent Learning Systems and Applications (JILSA) , 2012, DOI: 10.4236/jilsa.2012.43019
Abstract: Blood vessels in ophthalmoscope images play an important role in diagnosis of some serious pathology on retinal images. Hence, accurate extraction of vessels is becoming a main topic of this research area. In this paper, a new hybrid approach called the (Genetic algorithm and vertex chain code) for blood vessel detection. And this method uses geometrical parameters of retinal vascular tree for diagnosing of hypertension and identified retinal exudates automatically from color retinal images. The skeletons of the segmented trees are produced by thinning. Three types of landmarks in the skeleton must be detected: terminal points, bifurcation and crossing points, these points are labeled and stored as a chain code. Results of the proposed system can achieve a diagnostic accuracy with 96.0% sensitivity and 98.4% specificity for the identification of images containing any evidence of retinopathy.
Bulk Properties of Symmetric Nuclear and Pure Neutron Matter  [PDF]
Khaled Hassaneen, Hesham Mansour
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45B008

We study the equation of state (EOS) of symmetric nuclear and neutron matter within the framework of the Brueckner-Hartree-Fock (BHF) approach which is extended by including a density-dependent contact interaction to achieve the empirical saturation property of symmetric nuclear matter. This method is shown to affect significantly the nuclear matter EOS and the density dependence of nuclear symmetry energy at high densities above the normal nuclear matter density, and it is necessary for reproducing the empirical saturation property of symmetric nuclear matter in a nonrelativistic microscopic framework. Realistic nucleon-nucleon interactions which reproduce the nucleon-nucleon phase shifts are used in the present calculations.

Vascularity of a breast lump  [PDF]
Ghada M. Mansour
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.39120

The aim of this study was to find if Doppler ultrasound of the axillary and lateral thoracic arteries in breast cancer cases would differ from benign breast lesions and normal controls. Two hundred patients with breast lumps were included in the study. Clinical examination, mammography, breast ultrasound and fine needle aspiration or tru-cut biopsies were done for all cases. Breast ultrasound included morphological criteria of lump, lateral thoracic artery (LTA) Doppler, axillary lymph nodes, and axillary artery Doppler. All malignant cases had undergone mastectomy or lumpectomy. Lump size ranged from 1 to 5.1 (2.93 ± 1.6) cm. Eighty one cases were diagnosed as breast cancer and one hundred and nineteen cases were benign conditions. There was no significant difference regarding axillary artery and lump Doppler between the two groups while there was a difference of LTA Doppler with a cut off value of 0.67. Lateral thoracic artery resistance index measured by Doppler ultrasound was significantly lower in the malignant group in this study with a cut off value of 0.67.

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