Publications

Export 15775 results:
Sort by: Author [ Title  (Desc)] Type Year
A B C D [E] F G H I J K L M N O P Q R S T U V W X Y Z   [Show ALL]
E
Kasten-Pisula, U., A. Menegakis, I. Brammer, K. Borgmann, W. Y. Mansour, S. Degenhardt, M. Krause, A. Schreiber, J. Dahm-Daphi, C. Petersen, et al., "The extreme radiosensitivity of the squamous cell carcinoma SKX is due to a defect in double-strand break repair", Radiother Oncol, 2008/11/29, vol. 90, no. 2, pp. 257-64, Feb, 2009. AbstractWebsite

PURPOSE: Squamous cell carcinomas (SCCs) are characterized by moderate radiosensitivity. We have established the human head & neck SCC cell line SKX, which shows an exceptionally high radiosensitivity. It was the aim of this study to understand the underlying mechanisms. MATERIALS & METHODS: Experiments were performed with SKX and FaDu, the latter taken as a control of moderate radiosensitivity. Cell lines were grown as xenografts as well as cell cultures. For xenografts, radiosensitivity was determined via local tumour control assay, and for cell cultures using colony assay. For cell cultures, apoptosis was determined by Annexin V staining and G1-arrest by BrdU labelling. Double-strand breaks (DSBs) were detected by both constant-field gel electrophoresis (CFGE) and gammaH2AX-foci technique; DSB rejoining was also assessed by in vitro rejoining assay; chromosomal damage was determined by G01-assay. RESULTS: Compared to FaDu, SKX cells are extremely radiosensitive as found for both xenografts (TCD(50) for 10 fractions 46.0Gy [95% C.I.: 39; 54 Gy] vs. 18.9 Gy [95% C.I.: 13; 25Gy]) and cell cultures (D(0.01); 7.1 vs. 3.5Gy). Both cell lines showed neither radiation-induced apoptosis nor radiation-induced permanent G1-arrest. For DSBs, there was no difference in the induction but for repair with SKX cells showing a higher level of both, slowly repaired DSBs and residual DSBs. The in vitro DSB repair assay revealed that SKX cells are defective in nonhomologous endjoining (NHEJ), and that more than 40% of DSBs are rejoined by single-strand annealing (SSA). SKX cells also depicted a two-fold higher number of lethal chromosomal aberrations when compared to FaDu cells. CONCLUSIONS: The extreme radiosensitivity of the SCC SKX seen both in vivo and in vitro can be ascribed to a reduced DNA double-strand break repair, resulting from a defect in NHEJ. This defect might be due to preferred usage of other pathways, such as SSA, which prevents efficient endjoining.

Kasten-Pisula, U., A. Menegakis, I. Brammer, K. Borgmann, W. Y. Mansour, S. Degenhardt, M. Krause, A. Schreiber, J. Dahm-Daphi, C. Petersen, et al., "The extreme radiosensitivity of the squamous cell carcinoma SKX is due to a defect in double-strand break repair", Radiotherapy and oncology, vol. 90, no. 2: Elsevier, pp. 257–264, 2009. Abstract
n/a
Sattar, A. M. A., Ö. F. Ertuğrul, B. Gharabaghi, E. A. McBean, and J. Cao, Extreme learning machine model for water network management, , vol. 31, issue 1, pp. 157 - 169, 2019. AbstractWebsite

A novel failure rate prediction model is developed by the extreme learning machine (ELM) to provide key information needed for optimum ongoing maintenance/rehabilitation of a water network, meaning the estimated times for the next failures of individual pipes within the network. The developed ELM model is trained using more than 9500 instances of pipe failure in the Greater Toronto Area, Canada from 1920 to 2005 with pipe attributes as inputs, including pipe length, diameter, material, and previously recorded failures. The models show recent, extensive usage of pipe coating with cement mortar and cathodic protection has significantly increased their lifespan. The predictive model includes the pipe protection method as pipe attributes and can reflect in its predictions, the effect of different pipe protection methods on the expected time to the next pipe failure. The developed ELM has a superior prediction accuracy relative to other available machine learning algorithms such as feed-forward artificial neural network that is trained by backpropagation, support vector regression, and non-linear regression. The utility of the models provides useful inputs when planning and budgeting for watermain inspection, maintenance, and rehabilitation.

Aredah, A. S., O. F. Ertugrul, A. A. Sattar, H. Bonakdari, and B. Gharabaghi, "Extreme Learning Machine model for assessment of stream health using the Qualitative Habitat Evaluation Index", Water Supply, vol. 22, issue 5, pp. 5355 - 5375, 2022. Abstract
n/a
El-Beshary, D. M., S. M. Robaa, G. G. Abd El-Motey, Z. Salah, and M. M. Abdel Wahab, "The extreme climate indices for benghazi-libya from canadian regional-climate model", EnvironmentAsia, vol. 12, issue 1, pp. 102-107, 2019.
El-Beshary, D. M., S. M. Robaa, G. A. G. El-Motey, Z. Salah, and A. M. M. Wahab, "The Extreme Climate Indices for Benghazi-Libya from Canadian Regional- Climate Model", EnvironmentAsia , vol. 12, issue 1, pp. 102-107, 2019. dalal_et_al_2019.pdf
El-Beshary, D. M., S. M. Robaa, G. Gamal, and A. W. M. M. Zeinab Salah, "The Extreme Climate Indices for Benghazi-Libya from Canadian Regional Climate Model", EnvironmentAsia, vol. 12, issue 1, pp. 102-107, 2019.
Tawfik, A. R., and E. A. H. elDin Korashy, "Extra‑anatomical Transobturator Bypass, Modifications of the Technique 10 Cases Report and Review of Literature", Indian Journal of Vascular and Endovascular Surgery, vol. Volume 3, issue Issue 1 , pp. 11-14, 2016. indianjvascendovascsurg_2016_3_1_11_180202.pdf
Abdel-wahab, and K.S.M.Essa, "Extrapolation of Solar Irradiation Measurements: Case Study over Egypt, ", Renewable Energy, , vol. Vol. 14,, issue Nos. 1-4, pp. 229-239,, 1998.
Fatt-Hi, A., H. Fouad, and A. Taha, "Extrapharyngeal nasopharyngeal fibroma.", The Journal of the Egyptian Medical Association, vol. 61, no. 11-12, pp. 765–771, 1978. Abstract
n/a
Ahmed, M.A., O. K. N. R. M., "Extraordinary role of rare-earth elements on the transport properties of barium W-type hexaferrite", Materials Chemistry and Physics, vol. 113, no. 1, pp. 196-201, 2009. AbstractWebsite

The influence of R 2O 3 substitution on the electrical properties and the thermoelectric power on the W-type hexaferrite Ba 0.95R 0.05 Mg 0.5 Zn 0.5 Co Fe 16 O 27; R = Y 3+, Er 3+, Ho 3+, Sm 3+, Nd 3+, Gd 3+, and Ce 3+ ions as a function of the absolute temperature and frequency in the ranges 300-750 K and 100 kHz-4 MHz, respectively have been studied. The results obtained reveal that, by introducing a relatively small amount of R 2O 3 instead of Fe 2O 3, an important modification of both structure and physical properties can be obtained. The dielectric constant ε′, the dielectric loss factor ε″ and AC conductivity σ of the investigating samples have highest values in the case of Sm 3+. The values of the calculated activation energy varied between (0.335 and 0.553 eV) and (0.106 and 0.232 eV), above and below the transition temperature, respectively which indicate the semiconducting properties of the prepared samples. The conduction mechanism for Ho 3+ sample is associated with the small polaron whereas the hopping conduction mechanism is predominant mechanism for the samples doped with the rest of rare-earth ions. The thermoelectric power measurements indicated that the samples are n-type semiconductors except Er 3+ and Y 3+ samples, where the thermoelectric power of them is positive at low temperature but nearly above 480 and 375 K, respectively transits to negative. The charge carriers concentration n increases with slightly increasing RE ionic radius to critical value (≈1.04 Å), after that n becomes nearly constant. © 2008 Elsevier B.V. All rights reserved.

Ahmed, M.A., O. K. N. R. M., "Extraordinary role of rare-earth elements on the transport properties of barium W-type hexaferrite", Materials Chemistry and Physics, vol. 113, no. 1, pp. 196-201, 2009. AbstractWebsite

The influence of R 2O 3 substitution on the electrical properties and the thermoelectric power on the W-type hexaferrite Ba 0.95R 0.05 Mg 0.5 Zn 0.5 Co Fe 16 O 27; R = Y 3+, Er 3+, Ho 3+, Sm 3+, Nd 3+, Gd 3+, and Ce 3+ ions as a function of the absolute temperature and frequency in the ranges 300-750 K and 100 kHz-4 MHz, respectively have been studied. The results obtained reveal that, by introducing a relatively small amount of R 2O 3 instead of Fe 2O 3, an important modification of both structure and physical properties can be obtained. The dielectric constant ε′, the dielectric loss factor ε″ and AC conductivity σ of the investigating samples have highest values in the case of Sm 3+. The values of the calculated activation energy varied between (0.335 and 0.553 eV) and (0.106 and 0.232 eV), above and below the transition temperature, respectively which indicate the semiconducting properties of the prepared samples. The conduction mechanism for Ho 3+ sample is associated with the small polaron whereas the hopping conduction mechanism is predominant mechanism for the samples doped with the rest of rare-earth ions. The thermoelectric power measurements indicated that the samples are n-type semiconductors except Er 3+ and Y 3+ samples, where the thermoelectric power of them is positive at low temperature but nearly above 480 and 375 K, respectively transits to negative. The charge carriers concentration n increases with slightly increasing RE ionic radius to critical value (≈1.04 Å), after that n becomes nearly constant. © 2008 Elsevier B.V. All rights reserved.

Ahmed, M. A., N. Okasha, and R. M. Kershi, "Extraordinary role of rare-earth elements on the transport properties of barium W-type hexaferrite", Materials Chemistry and Physics, vol. 113, issue 1, pp. 196 - 201, 2009. AbstractWebsite

The influence of R 2O 3 substitution on the electrical properties and the thermoelectric power on the W-type hexaferrite Ba 0.95R 0.05 Mg 0.5 Zn 0.5 Co Fe 16 O 27; R = Y 3+, Er 3+, Ho 3+, Sm 3+, Nd 3+, Gd 3+, and Ce 3+ ions as a function of the absolute temperature and frequency in the ranges 300-750 K and 100 kHz-4 MHz, respectively have been studied. The results obtained reveal that, by introducing a relatively small amount of R 2O 3 instead of Fe 2O 3, an important modification of both structure and physical properties can be obtained. The dielectric constant ε′, the dielectric loss factor ε″ and AC conductivity σ of the investigating samples have highest values in the case of Sm 3+. The values of the calculated activation energy varied between (0.335 and 0.553 eV) and (0.106 and 0.232 eV), above and below the transition temperature, respectively which indicate the semiconducting properties of the prepared samples. The conduction mechanism for Ho 3+ sample is associated with the small polaron whereas the hopping conduction mechanism is predominant mechanism for the samples doped with the rest of rare-earth ions. The thermoelectric power measurements indicated that the samples are n-type semiconductors except Er 3+ and Y 3+ samples, where the thermoelectric power of them is positive at low temperature but nearly above 480 and 375 K, respectively transits to negative. The charge carriers concentration n increases with slightly increasing RE ionic radius to critical value (≈1.04 Å), after that n becomes nearly constant. © 2008 Elsevier B.V. All rights reserved.

Ahmed, M. A., and S. I. El-dek, "Extraordinary role of Ca2+ ions on the magnetization of LaFeO3 orthoferrite", Materials Science and Engineering: B, vol. 128, no. 1–3, pp. 30 - 33, 2006. AbstractWebsite

Samples of La1−xCaxFeO3 were synthesized in air for 0.05 ≤ x ≤ 0.55. X-ray powder diffraction analysis showed that the samples were formed in a single phased orthorhombic structure (Pbnm) where the lattice parameters were calculated and reported. The dc magnetic susceptibility was measured using Faraday's method from room temperature up to about 850 K at five different magnetic field intensities. The obtained results showed that the samples were antiferromagnetic with slight canting of the Fe3+ spins. The substitution of La3+ by Ca2+ ions lowers the Néel temperature. The calculated values of the effective magnetic moment as a function of the Ca2+ concentration were in good agreement with the reported data. The results were interpreted on the basis of the charge difference and the ionic radii of the La3+ and Ca2+ ions.

Ahmed, M.A., E. - D. S. I., "Extraordinary role of Ca2+ ions on the magnetization of LaFeO3 orthoferrite", Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 128, no. 1-3, pp. 30-33, 2006. AbstractWebsite

Samples of La1-xCaxFeO3 were synthesized in air for 0.05 ≤ x ≤ 0.55. X-ray powder diffraction analysis showed that the samples were formed in a single phased orthorhombic structure (Pbnm) where the lattice parameters were calculated and reported. The dc magnetic susceptibility was measured using Faraday's method from room temperature up to about 850 K at five different magnetic field intensities. The obtained results showed that the samples were antiferromagnetic with slight canting of the Fe3+ spins. The substitution of La3+ by Ca2+ ions lowers the Néel temperature. The calculated values of the effective magnetic moment as a function of the Ca2+ concentration were in good agreement with the reported data. The results were interpreted on the basis of the charge difference and the ionic radii of the La3+ and Ca 2+ ions. © 2005 Elsevier B.V. All rights reserved.

Ahmed, M.A., E. - D. S. I., "Extraordinary role of Ca2+ ions on the magnetization of LaFeO3 orthoferrite", Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 128, no. 1-3, pp. 30-33, 2006. AbstractWebsite

Samples of La1-xCaxFeO3 were synthesized in air for 0.05 ≤ x ≤ 0.55. X-ray powder diffraction analysis showed that the samples were formed in a single phased orthorhombic structure (Pbnm) where the lattice parameters were calculated and reported. The dc magnetic susceptibility was measured using Faraday's method from room temperature up to about 850 K at five different magnetic field intensities. The obtained results showed that the samples were antiferromagnetic with slight canting of the Fe3+ spins. The substitution of La3+ by Ca2+ ions lowers the Néel temperature. The calculated values of the effective magnetic moment as a function of the Ca2+ concentration were in good agreement with the reported data. The results were interpreted on the basis of the charge difference and the ionic radii of the La3+ and Ca 2+ ions. © 2005 Elsevier B.V. All rights reserved.

Ahmed, M.A., E. - D. S. I., "Extraordinary role of Ca2+ ions on the magnetization of LaFeO3 orthoferrite", Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 128, no. 1-3, pp. 30-33, 2006. AbstractWebsite

Samples of La1-xCaxFeO3 were synthesized in air for 0.05 ≤ x ≤ 0.55. X-ray powder diffraction analysis showed that the samples were formed in a single phased orthorhombic structure (Pbnm) where the lattice parameters were calculated and reported. The dc magnetic susceptibility was measured using Faraday's method from room temperature up to about 850 K at five different magnetic field intensities. The obtained results showed that the samples were antiferromagnetic with slight canting of the Fe3+ spins. The substitution of La3+ by Ca2+ ions lowers the Néel temperature. The calculated values of the effective magnetic moment as a function of the Ca2+ concentration were in good agreement with the reported data. The results were interpreted on the basis of the charge difference and the ionic radii of the La3+ and Ca 2+ ions. © 2005 Elsevier B.V. All rights reserved.

Ahmed, M. A., and S. I. El-dek, "Extraordinary role of Ca2+ ions on the magnetization of LaFeO3 orthoferrite", Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 128, issue 1-3, pp. 30 - 33, 2006. AbstractWebsite

Samples of La1-xCaxFeO3 were synthesized in air for 0.05 ≤ x ≤ 0.55. X-ray powder diffraction analysis showed that the samples were formed in a single phased orthorhombic structure (Pbnm) where the lattice parameters were calculated and reported. The dc magnetic susceptibility was measured using Faraday's method from room temperature up to about 850 K at five different magnetic field intensities. The obtained results showed that the samples were antiferromagnetic with slight canting of the Fe3+ spins. The substitution of La3+ by Ca2+ ions lowers the Néel temperature. The calculated values of the effective magnetic moment as a function of the Ca2+ concentration were in good agreement with the reported data. The results were interpreted on the basis of the charge difference and the ionic radii of the La3+ and Ca 2+ ions. © 2005 Elsevier B.V. All rights reserved.

El-Deab, M. S., and T. Ohsaka, "An extraordinary Electrocatalytic Reduction of Oxygen on Gold Nanoparticles-Electrodeposited Gold Electrodes", Electrochemistry Communications, vol. 4, pp. 288-292, 2002.
, "Extraocular muscle fenestration: a novel weakening procedure.", Canadian journal of ophthalmology. Journal canadien d'ophtalmologie, vol. 55, issue 5, pp. 455-457, 2020.
Rageh, M. A., A. Awadein, and Shaimaa A Arfeen, Extraocular muscle fenestration: a novel weakening procedure., , 2020.
Rageh, M. A., A. Awadein, and Shaimaa A Arfeen, "Extraocular muscle fenestration: a novel weakening procedure.", Canadian journal of ophthalmology. Journal canadien d'ophtalmologie, vol. 55, issue 5, pp. 455-457, 2020.
, "Extraocular muscle fenestration: a novel weakening procedure", Canadian Journal of Ophthalmology, vol. 55, issue 5, pp. 455-457, 2020.
Tourism