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Your search keyword '"Tammam, Mahmoud"' showing total 28 results
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28 results on '"Tammam, Mahmoud"'

7. Contribution of single pion electroproduction to the generalized Gerasimov-Drell-Hearn sum rule for the deuteron

Author

Fix, Alexander, Arenhövel, Hartmuth, and Tammam, Mahmoud

Subjects
Nuclear Theory
Abstract

The generalized Gerasimov-Drell-Hearn sum rule is evaluated for the contribution of single pion production on the deuteron by explicit integration up to an energy of 1.5 GeV for both coherent and incoherent production. As elementary $\gamma^* N\to\pi N$ amplitude the MAID2003 model has been used. For incoherent production final state interaction is included in the final $NN$ and $\pi N$ subsystems. The resulting contribution to the generalized transverse GDH sum rule is considerably smaller than the negative contribution from the disintegration channel $d(e,e')np$ which dominates the sum rule at low $Q^2$., Comment: 15 pages, 10 figures

Published
2009
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8. Does the timing of oral feeding affect the fistulization risk among head and neck cancer patients undergoing free flap reconstruction?

Author

Dean, Yomna E., Motawea, Karam R., Bamousa, Bdoor Ahmed A., Loayza Pintado, Jose J., Elkoumi, Ahmed, ElBadawi, Omar Adel Ahmed Awad, Zaki, Ibram, Elmetaafy, Amro, Abdulla, Taqwa Ali Mansoor Abbas, Albasri, Amal Mohamed Jaafar, Mohamed, Mohamed Ashraf Maher, Elawady, Sameh Samir, Hazir, Mohamed, Abdelazim, Hazem Mohamed, Tammam, Mahmoud Ibrahim, Soffar, Mohammed, Tanas, Yousef, Hazimeh, Yusef, Wilcox, Kailyn, and Aiash, Hani

Published
2024
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17. Estimate the Absolute Efficiency by MATLAB for the NaI (Tl) Detector Using IAEA-314.

Author

Zakaly, Hesham M. H., Uosif, Mohamed A., Issa, Shams, Saif, Mujahed, Tammam, Mahmoud, and El-Taher, Atef

Subjects
DETECTORS
Abstract

This works amid to calculating the absolute efficiency at any interesting γ–energy in the energy range between 10 and 1764 keV. by using fit function which has been developed to calculate theoretically the absolute γ-ray detection efficiencies of a cylindrical NaI(Tl) crystal. Efficiency of the NaI(Tl) calculator is a program built in MATLAB by the author of this paper to make it easier to calculate the efficiency of standard source. The absolute γ -ray detection efficiencies have been calculated for detectors 3˝ x 3˝ inches NaI(Tl) crystal. The absolute efficiency of the NaI (Tl) detector was calculated using standard sources (IAEA-314) which have known activity of 226Ra (732 Bqkg-1) and 232Th (17.8 ppm). In this calculation, experimental and theoretical efficiencies have been calculated. The uncertainties of efficiency calibration have been calculated also for quality control. Measurements were performed with calibrated point source. Gamma-ray energies under consideration were 0.356, 0.662, 1.17 and 1.33 MeV. Efficiency function was obtained by applying Weibull Model equation to the experimental efficiency data which give Best agreement between experimental and theoretical absolute detection efficiencies of 3×3-inch detector for gamma energy. [ABSTRACT FROM AUTHOR]

Published
2019
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22. Serum Transforming Growth Factor –β1 (TGF-β1) in Asthmatics: Association between Disease Control, Severity and Duration

Author

Neveen Abd El-Moneum Hassan, Omnia Abd El-Moneum Mohamed, Hanan O. Mohamed, Manal Mohamed Tammam Mahmoud, Ebtssam F. Mohammed, and AliaÑ Ar Mohamed-Hussein

Subjects
medicine.medical_specialty, business.industry, Moderate asthma, General Medicine, Bioinformatics, medicine.disease, Disease control, Gastroenterology, respiratory tract diseases, Uncontrolled asthma, Internal medicine, Asthma control, Medicine, Sputum, Airway Remodelling, medicine.symptom, business, Transforming growth factor, Asthma
Abstract

Rationale: Asthma is a chronic inflammatory disorder of the airways in which many cells and cellular elements play a role. Assessment of airway remodelling by analysis of blood and sputum markers has been developed as non-invasive procedures to bypass tissue biopsy. Aim of the work: evaluate the usefulness of estimation of serum TGF-β1, as non- invasive markers of airway remodelling in patients with bronchial asthma and correlation between its level and degree of asthma control, severity and duration. Patients and Methods: the study included 68 asthmatics and 20 controls. They were classified according to level of control, severity and duration. Blood samples were taken to estimate the serum levels of TGF-β1. Results: the serum level of TGF-β1 was significantly higher in asthmatics than controls and in patients with uncontrolled asthma compared to controlled (P

Published
2015

23. Matrix Metalloproteinase-9 (MMP-9) and Tissue Inhibitor of Metalloproteinase-1 (TIMP-1) as Non-Invasive Biomarkers of Remodelling in Asthma

Author

Omnia Abd El-Moneum Mohamed, Aliaё Abd-Rabou Mohamed-Hussein, Ebtssam F. Mohammed, Manal Mohamed Tammam Mahmoud, Neveen Abd El-Moneum Hassan, and Hanan O. Mohamed

Subjects
medicine.medical_specialty, medicine.diagnostic_test, business.industry, Non invasive biomarkers, Matrix metalloproteinase 9, Matrix metalloproteinase, medicine.disease, Omics, Gastroenterology, respiratory tract diseases, Internal medicine, Biopsy, Immunology, Medicine, Sputum, medicine.symptom, Respiratory system, business, Asthma
Abstract

Rationale: Airway remodelling is clinically defined as persistent airflow obstruction despite aggressive antiinflammatory therapies. Assessment of airway remodelling by analysis of serum markers has been developed as minimally invasive procedures. Aim of the work: Evaluate the usefulness of estimation of serum MMP-9, TIMP-1 and their ratio, as non-invasive markers of airway remodelling in asthmatics. Patients and methods: The study included 68 asthmatics and 20 controls. Patients were classified according to levels of asthma control, severity and disease duration. Serum samples were taken to estimate levels of MMP-9, TIMP-1 and their ratio. Results: Serum MMP-9, TIMP-1, and MMP-9/TIMP-1 were significantly higher in asthmatics than controls, in uncontrolled vs. controlled asthma (P 5 years vs.

Published
2015

24. Assessment of Natural Radionuclides and Heavy Metal Concentrations in Marine Sediments in View of Tourism Activities in Hurghada City, Northern Red Sea, Egypt.

Author

Zakaly, Hesham Mahmoud, Uosif, Mohamed Amin, Madkour, Hashem, Tammam, Mahmoud, Issa, Shams, Elsaman, Reda, and El-Taher, Atef

Subjects
RADIOACTIVITY, THORIUM isotopes, MARINE sediments, GAMMA ray spectrometry, HEAVY metals, RADIOISOTOPES, OCEANOGRAPHY
Abstract

The specific activity of 40K, 232Th and 226Ra in marine sediment samples collected from National Institute of Oceanography and Fisheries (NIOF) and Safier Hotel area in Hurghada city (the most important regions in Egypt), were measured by gamma ray spectrometry using NaI(Tl) detector. The values of specific activity varied from 7 ± 1 Bq kg-1 to 53 ± 4 Bq kg-1, 6 ± 1 Bq kg-1 to 32 ± 6 Bq kg-1, and from 167 ± 11 Bq kg-1 to 1120 ± 63 Bq kg-1 for 226Ra, 232Th and 40K, respectively. The heavy metals have been measured and analysed by atomic absorption spectrometer. The major range values of heavy metals concentrations in marine sediment samples were: Cu (10.5-78.0 μg g-1), Zn (21-150 μg g-1), Pb (30-53 μg g-1), Cd (2.50-4.00 μg g-1), Fe (5100-13150 μg g-1), Mn (118-298 μg g-1), Ni (17-36 μg g-1) and Co (16-18 μg g-1). The total organic matter (TOC) and carbonates (CaCo3) distribution have been measured at some locations. Also, the frequency distribution and the value of (232Th/226Ra), (232Th/40K) and (226Ra/40K) ratio for all measured samples were determined. Additionally, evaluations have been made of the radiological hazards and the results are diagrammed by Surfer program in maps. [ABSTRACT FROM AUTHOR]

Published
2019
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