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Search Results: 1 - 10 of 23674 matches for " Saleh Al-Omar "
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Method of Designing Generators of Pseudorandom Sequences for Information Protection Based on Shift Register with Non-Linear Feedback Function  [PDF]
Saleh Al-Omar
Journal of Information Security (JIS) , 2014, DOI: 10.4236/jis.2014.54020
Abstract: This paper proposes an efficient, high-tech method of construction of pseudorandom binary sequences generators with a repetition period 2n for n-bit shift register with a nonlinear feedback function. The developed method is illustrated by constructing a nonlinear function feedback shift register. It is proved that the offered method requires the realization of a memory size proportional to n2 that allows making successful use of suitable generators for practical use on the shift register of the longer word.
Burst Error Correction Method Based on Arithmetic Weighted Checksums  [PDF]
Saleh Al-Omar, Atef Obeidat
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.411098
Abstract: In this paper a new approach for increasing the performance of burst error correction that occurs during data transmission in low-frequency channels with pulse-code modulation is proposed. The specific technique is based on the weighted checksum which is computed with arithmetic operations. It is shown that the solution proposed not only guarantees the correction of any single error burst but it also lowers the computational complexity so that procedure correction time does not depend on controlled data block length. Finally, the use of the algorithm is illustrated via the thorough presentation of an example of erroneous data transmission.
Synthesis and Antimicrobial Activity of New 5-(2-Thienyl)-1,2,4-triazoles and 5-(2-Thienyl)-1,3,4-oxadiazoles and Related Derivatives
Mohamed A. Al-Omar
Molecules , 2010, DOI: 10.3390/molecules15010502
Abstract: New 5-(2-thienyl)-1,2,4-triazoles and 5-(2-thienyl)-1,3,4-oxadiazoles namely, N-[3-mercapto-5-(2-thienyl)-1,2,4-triazol-4-yl]-N'-arylthioureas 4a–e, 2-arylamino-5-(2-thienyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles 5a–e, 3-arylaminomethyl-5-(2-thienyl)-1,3,4-oxadiazoline-2-thiones 7a–e, 3-(N-substituted anilinomethyl)-5-(2-thienyl)-1,3,4-oxadiazoline-2-thiones 8a, b and 3-(4-substituted-1-piperazinylmethyl)-5-(2-thienyl)-1,3,4-oxadiazoline-2-thiones 9a–f, were prepared. The synthesized compounds were tested for in vitro activities against certain strains of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus Candida albicans. Compound 9a displayed marked broad spectrum antibacterial activity, while compounds 4d, 5e, 7b, 7c, 7d, 9b, 9c and 9d were highly active against the tested Gram-positive bacteria. None of the synthesized compounds were proved to be significantly active against Candida albicans.
Effect of 2-hydroxy-1, 4-naphthoquinone, a Natural Dye of Henna, on Aldehyde Oxidase Activity in Guinea Pig Liver
Mohamed A. Al-Omar
Journal of Medical Sciences , 2005,
Abstract: 2-hydroxy-1,4-naphthoquinone (HNQ; Lawsone, CAS 83-72-7) is the main dye ingredient found in the natural plant of Henna (Lawsonia inermis). The percentages of superoxide anion (O2.) and hydrogen peroxide (H2O2,) formation during the oxidation of 100 M phenanthridine by guinea pig aldehyde oxidase have been measured and found to be 6-10% and 85-90%, respectively. The effect of HNQ on the initial rates of phenanthridine oxidation, hydrogen peroxide formation and superoxide anion with aldehyde oxidase was investigated and compared with those of xanthine oxidase. It was found that HNQ is a specific inhibitor of aldehyde oxidase in vitro. In this study, HNQ inhibits the production of superoxide anion and substrate oxidation more potently than hydrogen peroxide. Thus, the site of interaction is thought to be flavin semiquinone, FADH.. The IC50 value of HNQ with phenanthridine oxidation by aldehyde oxidase is 9.3 1.1 M, which in excess of 15 fold of maximal plasma concentrations (Cmax) of HNQ, indicating a high degree of safety margin. The interaction of HNQ with aldehyde oxidase has been also investigated using different electron acceptors including, oxygen, potassium ferricyanide and cytochrome c and found to be equipotent.
Assessment of Olanzapine in Combined and Mono-therapy for the Treatment of Bipolar Disorder
M.A. Al-Omar
Pakistan Journal of Biological Sciences , 2005,
Abstract: In this report, collected data indicate the positive effect of olanzapine with high safety of margin. Combined therapy of olanzapine in the treatment of different subtype of bipolar disorder has a considerable benefit. It is appear that there is an agreement about olanzapine as a drug of choice in treatment of bipolar disorder. Consequently, further clinical studies are required with large number of population.
The Self-translator as Cultural Mediator: In Memory of Jabra Ibrahim Jabra
Nibras A. M. Al-Omar
Asian Social Science , 2012, DOI: 10.5539/ass.v8n13p211
Abstract: The present paper investigates the self-translation action as practiced by a bilingual writer: Jabra Ibrahim Jabra who has rendered a chapter of his novel Hunters in a narrow Street, written originally in English, back into Arabic. It is based on the assumption that the shifts or changes made in the Arabic text can hardly be attributed to the poetic licence or the creative potential of the self-translator. They should be seen in the light of bicultural competence of the self-translator as cultural mediator. This competence unfolds in his knowledge of the disparities between the readerships, socio-political structures and censorship rules of both the source and target languages and cultures. Consequently, the self-translator is also expected to designate and maintain the skopos of the target language text. Unlike the translator per se, the self-translator has the privilege of access to the intention of the source language text prior to its production . All these prerequisites contribute to the self-translator's decisions of introducing shifts and changes in the target language text through cultural mediation. Being written in English, the source language text is seen to have undergone cultural mediation too: a fact that leads to a conviction that Jabra was a 'double mediator '.
The changing face of healthcare in Saudi Arabia
Walston Stephen,Al-Harbi Yousef,Al-Omar Badran
Annals of Saudi Medicine , 2008,
Abstract: Many countries now struggle to provide cost-effective, quality healthcare services to their citizens. Saudi Arabia has experienced high costs along with concerns about quality of care in its public facilities. To address these issues the country is currently restructuring their healthcare system to privatize public hos--pitals and introduce insurance coverage for both foreign workers and citizens. The changes provide an interesting and insightful case for the challenges in radically changing a country′s healthcare system. The situation also demonstrates a unique case in the Middle East for greater reliance of the private sector to address rapidly escalating healthcare costs and deteriorating quality. The complexity of changing a healthcare system is discussed with the many challenges associated with the change.
Comparative Effects of Scopoletin and Menadione on Aldehyde Oxidase Activity of Guinea Pig Liver
Mohamed Abdulrahman Al-Omar,Mohammed Nasir Al-Arifi
Journal of Biological Sciences , 2005,
Abstract: Scopoletin, 7-hydroxy-5-methoxycoumarin, has been found to be a moderate inhibitor for aldehyde oxidase, a molybdo-flavoenzymes. It inhibits the release of superoxide anion more efficiently than hydrogen peroxide or substrate oxidation. Statistically, the inhibition of three-specific aldehyde oxidase substrates was significant (p<0.005) in the presence of 100 M Scopoletin. A progressive and non-competitive inhibition has been observed with inhibitor constant (Ki) value of 57.2 3.3 M using indole-3-aldehyde and oxygen as a substrate and electron acceptor, respectively. A specific site for interaction between Scopoletin and aldehyde oxidase has been proposed and its effect on the reactive oxygen species production has been discussed. The effect of Scopoletin on aldehyde oxidase activity has been compared with that of traditional and specific inhibitors, such as menadione.
Synthesis of Chiral Macrocyclic or Linear Pyridine Carboxamides from Pyridine-2,6-dicarbonyl Dichloride as Antimicrobial Agents
Rashad A. Al-Salahi,Mohamed A Al-Omar,Abd El-Galil E Amr
Molecules , 2010, DOI: 10.3390/molecules15096588
Abstract: A series of chiral linear and macrocyclic bridged pyridines has been prepared starting from pyridine-2,6-dicarbonyl dichloride (2). The coupling of 1 with D-alanyl methyl ester gave 2,6-bis-D-alanyl pyridine methyl ester (3). Hydrazinolysis of 3 with hydrazine hydrate afforded bis-hydrazide 4. The latter was reacted with thiophene-2-carbaldehyde, phthalic anhydride or cyclohexanone to afford bis-carboxamide pyridine derivatives 5-7, respectively. Compound 4 was coupled with p-methoxy- or p-nitroaceto-phenone to yield compounds 8 and 9. In addition, 4 was reacted with 1,2,4,5-benzenetetra-carboxylic acid dianhydride or 1,4,5,8-naphthalenetetracarboxylic acid dianhydride to afford the macrocyclic octacarboxaamide pyridines 10 and 11. The detailed synthesis, spectroscopic data and antimicrobial screening for the synthesized compounds are reported.
Hematological Abnormalities in Saudis Suffering from Pulmonary Tuberculosis and Their Reponce to the Treatment
I.A. Al-Omar,R.M. Al-Ashban,A.H. Shah
Research Journal of Pharmacology , 2013,
Abstract: Pulmonary Tuberculosis (PTB) is a common disease in developing countries and efforts have been made to diagnose patients presenting complex hematological and biochemical picture. Hematological abnormalities have been associated with tuberculosis and response to drug therapy often showed varied resistance. However, changes in response to therapy have not fully been determined in PTB patients living in the developing countries. In PTB patients rise in hemogloin and hematocrit levels are used as markers reflecting response to treatment. Furthermore, decrease in platelet count and in white cell count and reduction in Erythrocyte Sedimentation Rate (ESR) were regarded as good indicatiors to obverve drug responce and disease control. During current study mild anemia was frequently observed in PTB patients. Several reports suggested leucocytosis with neutrophilia. Platelet count and erythrocyte sedimentation rate were elevated in PTB which is well influenced and corrected by using different combinations of antituberculosis drugs. Although several investigations have been done on adult male and female PTB parients in Saudi Arabia, however, there is no comprehenssive report available on the significance of different haematological parameters in pretreatment and post-treatment PTB patients. Current study was designed to investigate hematological changes both in adult male and female Saudi PTB patients. All the parameters at the time of diagnosis and 6 weeks post-treatment were studied and the results are present in current communication.
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