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Search Results: 1 - 10 of 404657 matches for " Isam M. Ibrahim "
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Structural and Characteristics of Manganese Doped Zinc Sulfide Nanoparticles and Its Antibacterial Effect against Gram-Positive and Gram-Negative Bacteria  [PDF]
Iftikhar M. Ali, Isam M. Ibrahim, Entissar F. Ahmed, Qayes A. Abbas
Open Journal of Biophysics (OJBIPHY) , 2016, DOI: 10.4236/ojbiphy.2016.61001
Abstract: The Manganese doped zinc sulfide nanoparticles of the cubic zinc blende structure with the average crystallite size of about 3.56 nm were synthesized using a coprecipitation method using Thioglycolic Acid as an external capping agent for surface modification. The ZnS:Mn2+ nanoparticles of diameter 3.56 nm were manufactured through using inexpensive precursors in an efficient and eco-friendly way. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) spectroscopy are used to examine the structure, morphology and chemical composition of the nanoparticles. The antimicrobial activity of (ZnS:Mn2+) nanocrystals was investigated by measuring the diameter of inhibition zone using well diffusion mechanism versus two various bacterial strains. The technique of microorganism inactivation was considered as sorts-dependent. Bacillus subtilis showed the largest antibacterial sensitivity (35 mm) to ZnS: Mn2+ nanoparticles at a concentration (50 mM) whereas Escherichia coli offered maximum zone of inhibition (20 mm) at the same concentration. In this study, the results indicated that ZnS:Mn2+ nanoparticles were found to have significant antibacterial activity against Gram-negative (E. coli) and Gram-positive (Bacillus subtilis) bacteria.
The Level of Heavy Metals in Selected Vegetables Crops Collected from Baghdad City Markets
Isam M. Jawad
Pakistan Journal of Nutrition , 2010,
Abstract: Nineteen raw vegetable crops were collected from major markets in Baghdad areas uncontaminated by human activities other than normal agricultural practice. Six hundred samples were prepared and analyzed under carefully controlled conditions for cadmium, lead, iron, copper and Zinc. The Levels of these Heavy Metals in the vegetables were relatively low with respect to the proposed maximum acceptable concentrations for human consumption. In lettuce, spinach and parsley relatively high level of lead and cadmium were noticed compared with tomato, eggplant and onion. Iron was the only element that showed statistical variation among the different of vegetables.
Estimation of Nitrite, Nitrate and N-Nitrosamines in Selected Food Samples
Isam M. Jawad
Pakistan Journal of Nutrition , 2012,
Abstract: Determination of nitrite, nitrate and N-nitrosamines in different types of milk and yogurt were carried out using colorimetric and GLC methods. This study shows that the average contents of nitrite and nitrate in milk were 0.045 μg/ml and 2.96 μg/ml respectively. Unidentified nitrosamines were observed in samples analyzed and neither DMN or DEN were detected. Selection of soft drink samples contained 3.9 μg/ml and 0.43 μg/ml of DMN and DEN respectively, water of industrial areas were observed to contained relatively high concentration of DMN (3.4 μg/ml) and DEN (0.25 μg/ml).
“Engendering War in Hanan Al Shaykh’s The Story of Zahra.”
Isam M. Shihada
Nebula , 2008,
The Patriarchal Class System in Nawal El Saadawi’s God Dies by the Nile.
Isam M. Shihada
Nebula , 2007,
The Basic Idea behind the Relativistic and the Quantum Concepts  [PDF]
Ahmed Isam
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.71015
Abstract: A new aspect of unification is presented in this paper. This aspect depends on two postulates of our recent theory concerning light propagation in a specific medium. The special theory of relativity is demonstrated as a reflection of our first postulate, regarding the existence of multiple, equivalent rest frames in our medium. The second postulate is concerned with energy forms in nature, and it deals with the quantum behavior of light and wave behavior of matter. By using this postulate, we are able to justify the existence of these two phenomena. As a consequence of this, gravity as described by general relativity is unified as a background-independent interaction under the same postulate.
Spacetime Discreteness: Shedding Light on Two of the Simplest Observations in Physics  [PDF]
Ahmed Isam
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.97086
Abstract: Loop quantum gravity is considered to be one of the two major candidates for a theory of quantum gravity. The most appealing aspect about this theory is it predicts that spacetime is not continuous; both space and time have a discrete nature. Simply, space is not infinitely divisible, but it has a granular structure, and time does not flow continuously like a smooth river. This paper demonstrates a review for two missed (unnoted) observations that support the discreteness of the spacetime. The content of this paper does not validate the specific model of quantized geometry of the spacetime which is predicted by the theory itself. Instead, it proves that time does not flow continuously. But it flows in certain, discrete steps, like a ticking of a clock, due to a simple observation which is absence of any possible value of time that can exist between the present and the future. Regarding space, it validates the spatial discreteness, and the existence of spatial granules (space quanta) due to a simple observation which is the existence of the origin position in a coordinates system. All of this is achieved by reviewing the concept of discreteness itself, and applied directly to the observations.
A Study of Correlation of Serum Chromium Level with Glycosylated Haemoglobin (HbA1c), Total Cholesterol and Triglycerides, among Type 2 Diabetes Patients  [PDF]
Hani M. Mohamed, Isam M. Sadik, Abdelgadir Eltom, Ahmed L. Osman, Asaad MA. Babker
Open Journal of Blood Diseases (OJBD) , 2019, DOI: 10.4236/ojbd.2019.91001
Abstract: Background: Diabetes mellitus is a common disease and it is a major cause of morbidity; several studies indicate that diabetes is a likely under reported cause of death. Chromium’s is important trace element to control diabetes mellitus and metabolism of carbohydrate, lipid and protein. Objective: The purpose of this study was to understand the relationship between serum chromium, with HbA1c, Total cholesterol and Triglycerides among type 2 diabetes patients among diabetic patients. Methodology: This is cross-sectional study done in Jabber Abu Ezz Centre for treatment and care of diabetics in Khartoum—Sudan. Four hundred subjects were enrolled in this study; one hundred subjects were normal healthy as control group, and three hundred subjects diabetic patient type 2 as test group; demographic and biochemical data were collected; serum chromium, Glycosylated Haemoglobin (HbA1c), Total cholesterol Triglycerides, were determined by using NYCOCARD READER II, spectrophotometer (Biosystem 310) and spectrophotometer 210-VGP. Result: In this study there is significant parameters level means of FBS HbA1c, Total Cholesterol, Triglycerides and Chromium of the test groups when compared with healthy control groups subjects (P = 0.001, 0.018, 0.01, 0.011, 0.004), respectively. Significant negative correlation is between FBS, HbA1c, Total Cholesterol, Triglycerides and Chromium (r = ?0.555, P value = 0.003), (r = ?0.668, P value = 0.002), (r = ?0.335, P value = 0.004) and (r = ?0.774, P value = 0.002) respectively. Conclusion: There was significant correlation between serum Chromium level with fasting blood sugaer, Glycosylated Haemoglobin (HbA1c), Total cholesterol and Triglycerides among type 2 diabetes patients.
The shortened disabilities of the arm, shoulder and hand questionnaire (QuickDASH): validity and reliability based on responses within the full-length DASH
Christina Gummesson, Michael M Ward, Isam Atroshi
BMC Musculoskeletal Disorders , 2006, DOI: 10.1186/1471-2474-7-44
Abstract: The study was based on extracting QuickDASH item responses from the responses to the full-length DASH questionnaire completed by 105 patients with a variety of upper extremity disorders before surgery and at follow-up 6 to 21 months after surgery. The DASH and QuickDASH scores were compared for the whole population and for different diagnostic groups. For longitudinal construct validity the effect size and standardized response mean were calculated. Analyses with ROC curves were performed to compare the ability of the DASH and QuickDASH to discriminate among patients classified according to the magnitude of self-rated improvement. Cross-sectional and test-retest reliability was assessed.The mean DASH score was 34 (SD 22) and the mean QuickDASH score was 39 (SD 24) at baseline. For the different diagnostic groups the mean and median QuickDASH scores were higher than the corresponding DASH scores. For the whole population, the mean difference between the QuickDASH and DASH baseline scores was 4.2 (95% CI 3.2–5.3), follow-up scores was 2.6 (1.7–3.4), and change scores was 1.7 (0.6–2.8).The overall effect size and standardized response mean measured with the DASH and the QuickDASH were similar. In the ROC analysis of change scores among patients who rated their arm status as somewhat or much better and those who rated it as unchanged the difference in the area under the ROC curve for the DASH and QuickDASH was 0.01 (95% CI -0.05–0.07) indicating similar discriminant ability.Cross-sectional and test-retest reliability of the DASH and QuickDASH were similar.The results indicate that the QuickDASH can be used instead of the DASH with similar precision in upper extremity disorders.Patient-reported outcome measures have become an important part of the assessments used in clinical studies. One of the outcome measures intended for upper extremity disorders is the 30-item disabilities of the arm, shoulder and hand (DASH) questionnaire, which has been assessed regarding reliabil
Catalytic Activity and Selectivity of Unsupported Dodecatungstophosphoric Acid, and Its Cesium and Potassium Salts Supported on Silica  [PDF]
Shaimaa M. Ibrahim
Modern Research in Catalysis (MRC) , 2013, DOI: 10.4236/mrc.2013.23016

Potassium and cesium salts of tungstophosphoric acid were prepared by precipitation method. For sake of comparison HPW, potassium and cesium tungstophosphates were supported on silica (20 wt%) by wet impregnation method. The catalysts were characterized by XRD, nitrogen adsorption-desorption measurements at 77 K, and the catalytic activity has been studied by using the catalytic conversion of tert-butanol at temperatures between 323 and 423 K. The results revealed that all of the catalysts were active and selective towards dehydration of tert-butanol yielding isobutene with low amount of isooctene as result of oligomerization process. Substitution of one proton of HPW by cesium or potassium cation exerted no measurable effect on the catalytic activity. The conversion over unsupported catalysts increased by increasing the cation content per Keggin unit of x 2. Supporting the previous salts on SiO2 resulted in a significant decrease in the catalytic activity upon increasing cation content. Activation energy was calculated for different solids.

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