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11.
S.A. Safwan A.S. Asmaa Nagwa El meshed M.H. Hekmat TH.M. El-Sherbini S.H. Allam 《Superlattices and Microstructures》2010
Within the effective mass approximation, we investigated theoretically the ground-state energy of a single particle and the binding energy of the neutral donor impurity (D0) affected by a lateral electric field in a parabolic quantum dot (QD). The results show that the electron and the hole ground-state energy and the band to band transition energies shift to lower values (red shift) by increasing the field intensity. The quantum Stark shift (QSS) for the electron increases rapidly in the quasi spherical QD (QSQD) by increasing the lateral field, whereas for the hole it increases monotony. In the cylindrical QDs (CQDs), we found that the QSS for electron and hole increase monotonically. The quantum size, lateral electric field and impurity position effect on the binding energy of neutral donor (D0) is studied. Unexpected behavior of D0 in quantum well limit (QW), the binding energy of D0 is increasing (blue shift) with increasing QD radius R at the presence of a lateral electric field. It appears that for a fixed size of the QD, the off-center binding energy decreases when the impurity ion is displaced from the center to the QD borders, while it is shifted to lower energy with increasing the field. 相似文献
12.
We have developed highly efficient, one‐pot three component reaction of 5‐amino‐uracil and aromatic aldehydes with thioglycolic acid for the synthesis of N‐uracil‐thiazolidinones in excellent yields. The same products were also prepared by the reaction of Schiff bases of 5‐amino‐uracil with thioglycolic acid. In addition, benzylation of thiazolidinone derivatives and Schiff bases by using benzyl chloride was investigated. The results obtained from elemental microanalysis and different spectral data are in agreement with the assigned structures. 相似文献
13.
Asmaa H. Mohamed 《Journal of heterocyclic chemistry》2019,56(10):2831-2838
A simple and efficient pathway to tether conjugates of monosaccharides or aromatic moieties to uracil establishing a 1,2,3‐triazole linker via click chemistry was reported. The reaction of arylimines of 5‐amino uracil with propargyl bromide in a basic medium gave a di‐propargylated uracil. The latter compound was converted into molecular architectures containing bis‐1,2,3‐triazole rings through Cu‐catalyzed 1,3‐cycloaddition reaction with different azides. The same arylimine of 5‐amino uracil yielded different products under reflux with propargyl bromide in acetonitril with the majority to 6‐propargylated‐5‐amino uracil. 相似文献
14.
Eid Eldesouki I. Khalaf-Allah Reda A. Albadry Asmaa I. Easa Ammar S. 《Journal of Thermal Analysis and Calorimetry》2022,147(13):7523-7538
Journal of Thermal Analysis and Calorimetry - The Stirling cycle is regarded as one alternative to the compressive cooling cycle. The current study examines the performance of a beta Stirling... 相似文献
15.
Nagwa Abo El-Maali Asmaa Y. Wahman Aref A.M. Aly Ahmed Y. Nassar Douaa M. Sayed 《应用有机金属化学》2020,34(6):e5594
Lanthanide complexes are of increasing importance in cancer diagnosis and therapy. In the present study 1:1 and 1:3 solid complexes of La (III)–5-FU (5-fluorouracil) were prepared and characterized. In solution, the formation of 1:1 La (III) and Eu (III) complexes enabled the enhancement of 5-FU's effectiveness. Binding constants of the 1:1 complexes of both metals were estimated using spectrophotometry and HPLC with fluorescence detection methods. The thermodynamic parameters ΔG ° , ΔH ° and ΔS ° were calculated using differential scanning calorimetry. Evaluation of the cytotoxic activity of the 1:1 La (III)- and Eu (III)–5-FU complexes was performed through two methodologies, trypan blue for cell viability where La (III)- and Eu (III)–5-FU complexes were found to have 52,000 and 80,000 dead cells, respectively, and via flow cytometric analysis to measure the apoptotic values, which were found to be 59.87 and 86.86% respectively. 相似文献
16.
El-Kady Mohamed Abbas Eman M. H. Salem Marwa S. Kassem Asmaa F. M. Abd El-Moez Sherein I. 《Research on Chemical Intermediates》2016,42(4):3333-3349
Research on Chemical Intermediates - 1,3-Thiazol derivatives have been synthesized via reaction of 1-(1-(5,6-dimethoxy-2-oxobenzo[d]thiazol-3(2H)-yl)propan-2-ylidene)-4-substituted... 相似文献
17.
Optical Review - The analytical solution of a three-level atom interacting with four systems of N-two-level atoms is studied. The atomic inversion and the correlation function as applications of... 相似文献
18.
Asmaa H. Mohamed Hager S. Abdelmeged Raafat M. Shaker Fathy F. Abdel-Latif 《Journal of heterocyclic chemistry》2021,58(12):2372-2380
The present article describes a facile one-pot synthesis of a new series of 4,4′-(1,4-phenylene)-dipyrimidines ( 6a–c and 10a, b ) by the reaction of terephthalaldehyde ( 1 ), 2-acetylthiophene, and/or nitriles with S-benzylthiouronium chloride 3a . And also, the di-pyrimidinones 13a-d were obtained by the reaction of different amidines 3a–d and ethyl cyanoacetate ( 11 ) with terephthalaldehyde ( 1 ) under solvent-free conditions in the existence of sodium hydroxide which is found to be a more efficient base for these reactions. The final products were characterized by spectral data and elemental analysis, IR, MS, 1 H, and 13 C NMR spectroscopy. 相似文献
19.
El Zaher Asmaa A. Elkady Ehab F. El Houssini Ola M. El Ghwas Hind E. 《平面色谱法杂志一现代薄层色谱法》2018,31(6):461-468
JPC – Journal of Planar Chromatography – Modern TLC - New stability-indicating thin-layer chromatography (TLC)—densitometry and reversed-phase liquid chromatography (RP-LC)... 相似文献
20.
Asmaa Abdella Ashraf F. El-Baz Ibrahim A. Ibrahim Emad Eldin Mahrous Shang-Tian Yang 《Natural product research》2018,32(20):2382-2391
β-glucosidase enzyme produced from Aspergillus niger NRRL 3122 has been partially purified and characterised. Its molecular weight was 180 KDa. The optimal pH and temperature were 3.98 and 55 °C, respectively. It promoted the hydrolysis of soy flour isoflavone glycosides to their aglycone. Two-level Plackett–Burman design was applied and effective variables for genistein production were determined. Reaction time had a significant positive effect, and pH had a significant negative effect. They were further evaluated using Box–Behnken model. Accordingly, the optimal combination of the major reaction affecting factors was reaction time, 5 h and pH, 4. The concentration of genistein increased by 11.73 folds using this optimal combination. The antioxidant activity of the non-biotransformed and biotransformed soy flour extracts was determined by DPPH method. It was found that biotransformation increased the antioxidant activity by four folds. 相似文献